TPS62140, TPS62140A TPS62141, TPS62142, TPS62143 www.ti.com SLVSAJ0B - NOVEMBER 2011 - REVISED JUNE 2013 3-V to 17-V 2-A Step-Down Converter in 3x3 QFN Package Check for Samples: TPS62140, TPS62140A, TPS62141, TPS62142, TPS62143 FEATURES DESCRIPTION 1 * * * * * * * * * * * * * * The TPS6214X family is an easy-to-use synchronous step-down dc-dc converter optimized for applications with high power density. A high switching frequency of typically 2.5MHz allows the use of small inductors and provides fast transient response by use of the DCS-ControlTM topology. TM DCS-Control Topology Input Voltage Range: 3 V to 17 V Up to 2-A Output Current Adjustable Output Voltage from 0.9 V to 6 V Pin-Selectable Output Voltage (Nominal, +5%) Programmable Soft Start and Tracking Seamless Power-Save Mode Transition Quiescent Current of 17 A (typ.) Selectable Operating Frequency Power-Good Output 100% Duty-Cycle Mode Short-Circuit Protection Over Temperature Protection Available in a 3-mm x 3-mm, QFN-16 Package With its wide operating input voltage range of 3V to 17V, the devices are ideally suited for systems powered from either a Li-Ion or other batteries, as well as from 12-V intermediate power rails. It supports up to 2A of continuous output current at output voltages between 0.9V and 6V (with 100% duty-cycle mode). The output voltage start-up ramp is controlled by the soft-start pin, which allows operation as either a standalone power supply or in tracking configurations. Power sequencing is also possible by configuring the Enable (EN) and open-drain Power Good (PG) pins. APPLICATIONS * * * * * * In power-save mode, the devices show quiescent current of about 17A from VIN. Power Save Mode, entered automatically and seamlessly if load is small, maintains high efficiency over the entire load range. In Shutdown Mode, the device is turned off and shutdown current consumption is less than 2A. Standard 12-V Rail Supplies POL Supply From Single or Multiple Li-Ion Battery Solid-State Disk Drives Embedded Systems LDO Replacement Mobile PCs, Tablet, Modems, Cameras The device, available in adjustable and fixed output voltage versions, is packaged in a 16-pin QFN package measuring 3 x 3 mm (RGT). spacing (3 .. 17)V 1.8V / 2A 2.2 H 10uF PVIN SW AVIN VOS PG EN 100k 22uF TPS62141 SS/TR 3.3nF FB DEF AGND FSW PGND Figure 1. Typical Application and Efficiency 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright (c) 2011-2013, Texas Instruments Incorporated TPS62140, TPS62140A TPS62141, TPS62142, TPS62143 SLVSAJ0B - NOVEMBER 2011 - REVISED JUNE 2013 www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. ORDERING INFORMATION (1) TA OUTPUT VOLTAGE PART NUMBER (2) adjustable TPS62140 TPS62140RGT QTZ adjustable TPS62140A (3) TPS62140ARGT PA7I 1.8 V TPS62141 TPS62141RGT QWA 3.3 V TPS62142 TPS62142RGT QWB 5V TPS62143 TPS62143RGT QWC -40C to 85C (1) (2) (3) PACKAGE 16-Pin QFN ORDERING PACKAGE MARKING For detailed ordering information, see the PACKAGE OPTION ADDENDUM section at the end of this data sheet. Contact the factory to check availability of other fixed output voltage versions. While TPS6214X has PG=High Z, TPS62140A features PG=Low, when device is in shutdown through EN, UVLO or Thermal Shutdown. ABSOLUTE MAXIMUM RATINGS (1) over operating free-air temperature range (unless otherwise noted) MIN Pin voltage range (2) Power-good sink current Temperature range ESD rating (3) (1) (2) (3) MAX AVIN, PVIN -0.3 20 EN, SS/TR -0.3 VIN+0.3 SW -0.3 VIN+0.3 DEF, FSW, FB, PG, VOS -0.3 PG V 7 V mA -40 125 Storage temperature range, Tstg -65 150 CDM Charged-device model V 10 Operating junction temperature range, TJ HBM Human-body model UNIT C 2 kV 0.5 kV Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. All voltages are with respect to network ground terminal. ESD testing is performed according to the respective JESD22 JEDEC standard. THERMAL INFORMATION THERMAL METRIC (1) TPS6214X JA Junction-to-ambient thermal resistance JC(TOP) Junction-to-case(top) thermal resistance JB Junction-to-board thermal resistance 11 JT Junction-to-top characterization parameter 0.5 JB Junction-to-board characterization parameter 10 JC(BOTTOM) Junction-to-case(bottom) thermal resistance 3.5 (1) UNITS RGT 16 PINS 29.1 15 C/W For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953. RECOMMENDED OPERATING CONDITIONS over operating free-air temperature range (unless otherwise noted) MIN Supply voltage, VIN (at AVIN and P VIN) TYP MAX UNIT 3 17 V Operating free-air temperature, TA -40 85 C Operating junction temperature, TJ -40 125 C 2 Submit Documentation Feedback Copyright (c) 2011-2013, Texas Instruments Incorporated Product Folder Links: TPS62140 TPS62140A TPS62141 TPS62142 TPS62143 TPS62140, TPS62140A TPS62141, TPS62142, TPS62143 www.ti.com SLVSAJ0B - NOVEMBER 2011 - REVISED JUNE 2013 ELECTRICAL CHARACTERISTICS over free-air temperature range (TA=-40C to +85C), typical values at VIN=AVIN=PVIN=12V and TA=25C (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT SUPPLY Input voltage range (1) VIN 3 IQ Operating quiescent current EN = High, IOUT = 0 mA, device not switching ISD Shutdown current (2) EN = Low VUVLO TSD Undervoltage lockout threshold Falling input voltage 2.6 Hysteresis 17 V 17 25 A 1.5 4 A 2.7 2.8 200 Thermal shutdown temperature 160 Thermal shutdown hysteresis V mV C 20 CONTROL (EN, DEF, FSW, SS/TR, PG) VH High-level input threshold voltage (EN, DEF, FSW) VL Low-level input threshold voltage (EN, DEF, FSW) ILKG Input leakage current (EN, DEF, FSW) VTH_PG Power-good threshold voltage VOL_PG Power-good output low IPG= -2 mA ILKG_PG Input leakage current (PG) VPG = 1.8 V ISS/TR SS/TR pin source current 0.9 EN, DEF, FSW = VIN or GND V 0.3 V 0.01 1 A Rising (%VOUT) 92 95 98 Falling (%VOUT) 87 90 93 0.07 0.3 % V 1 400 nA 2.5 2.7 A VIN 6 V 90 170 VIN = 3 V 120 VIN 6 V 40 VIN = 3 V 50 2.3 POWER SWITCH High-side MOSFET ON-resistance rDS(on) Low-side MOSFET ON-resistance ILIMF High-side MOSFET forward current limit (3) VIN = 12 V, TA = 25C 2.45 3 70 3.5 m m A OUTPUT VREF Internal reference voltage (4) ILKG_FB Input leakage current (FB) TPS62140, VFB = 0.8 V Output voltage range (TPS62140) VIN VOUT DEF (output voltage programming) DEF = 0 (GND) VOUT DEF = 1 (VOUT) VOUT + 5% VOUT (1) (2) (3) (4) (5) (6) Initial output voltage accuracy 0.8 (5) 1 0.9 V 100 nA 6.0 V PWM mode operation, VIN VOUT + 1 V -1.8 1.8 PWM mode operation, VIN VOUT +1 V, TA = -10C to 85C -1.5 1.6 Power-save mode operation, COUT=22F -2.3 % 2.8 Load regulation (6) VIN = 12 V, VOUT = 3.3 V, PWM mode operation 0.05 %/A Line regulation (6) 3 V VIN 17 V, VOUT = 3.3 V, IOUT = 1 A, PWM mode operation 0.02 %/V The device is still functional down to undervoltage lockout (see parameter VUVLO). Current into AVIN + PVIN pins This is the static current limit. It can be temporarily higher in applications due to internal propagation delay (see Current Limit and Short Circuit Protection section). This is the voltage regulated at the FB pin. This is the accuracy provided by the device itself (line and load regulation effects are not included). For the fixed-voltage versions the (internal) resistive divider is included. Line and load regulation depend on external component selection and layout (see Figure 17 and Figure 18). Copyright (c) 2011-2013, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: TPS62140 TPS62140A TPS62141 TPS62142 TPS62143 3 TPS62140, TPS62140A TPS62141, TPS62142, TPS62143 SLVSAJ0B - NOVEMBER 2011 - REVISED JUNE 2013 www.ti.com DEVICE INFORMATION SW 3 PG 4 PGND VOS EN 13 Exposed Thermal Pad 5 6 7 8 DEF 2 14 FSW SW 15 AGND 1 16 FB SW PGND RGT PACKAGE (TOP VIEW) 12 PVIN 11 PVIN 10 AVIN 9 SS/TR Terminal Functions PIN (1) NAME NO. I/O DESCRIPTION SW 1, 2 ,3 O Switch node, which is connected to the internal MOSFET switches. Connect inductor between SW and output capacitor. PG 4 O Output power-good (High = VOUT ready, Low = VOUT below nominal regulation); open-drain (requires pullup resistor; goes high-impedance when device is switched off) FB 5 I Voltage feedback of adjustable version. Connect resistive voltage divider to this pin. Its recommended to connect FB to AGND on fixed output-voltage versions for improved thermal performance. AGND 6 - Analog ground. Must be connected directly to the Exposed Thermal Pad and common ground plane. FSW 7 I Switching frequency select (Low 2.5 MHz, High 1.25 MHz (2) for typical operation) (3) DEF 8 I Output voltage scaling (Low = nominal, High = nominal + 5%) (3) SS/TR 9 I Soft-start / tracking pin. An external capacitor connected to this pin sets the internal voltage-reference rise time. It can be used for tracking and sequencing. AVIN 10 I Supply voltage for control circuitry. Connect to same source as PVIN. PVIN 11, 12 I Supply voltage for power stage. Connect to same source as AVIN. 13 I Enable input (High = enabled, Low = disabled) (3) 14 I Output-voltage sense pin and connection for the control loop circuitry. 15, 16 - Power ground. Must be connected directly to the Exposed Thermal Pad and common ground plane. - Must be connected to AGND (pin 6), PGND (pin 15,16) and common ground plane (4). Must be soldered to achieve appropriate power dissipation and mechanical reliability. EN VOS PGND Exposed thermal pad (1) (2) (3) (4) 4 For more information about connecting pins, see the DETAILED DESCRIPTION and APPLICATION INFORMATION sections. Connect FSW to VOUT or PG in this case. An internal pulldown resistor keeps the logic level low, if pin is floating. See Figure 41. Submit Documentation Feedback Copyright (c) 2011-2013, Texas Instruments Incorporated Product Folder Links: TPS62140 TPS62140A TPS62141 TPS62142 TPS62143 TPS62140, TPS62140A TPS62141, TPS62142, TPS62143 www.ti.com SLVSAJ0B - NOVEMBER 2011 - REVISED JUNE 2013 FUNCTIONAL BLOCK DIAGRAM PG Soft start Thermal Shtdwn UVLO AVIN PVIN PVIN PG control HS lim comp EN* SW SS/TR power control control logic gate drive SW DEF* SW FSW* comp LS lim VOS direct control & compensation ramp _ FB comparator + timer tON error amplifier DCS - ControlTM * This pin is connected to a pull down resistor internally (see Detailed Description section). AGND PGND PGND Figure 2. TPS62140 (Adjustable Output Voltage) Copyright (c) 2011-2013, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: TPS62140 TPS62140A TPS62141 TPS62142 TPS62143 5 TPS62140, TPS62140A TPS62141, TPS62142, TPS62143 SLVSAJ0B - NOVEMBER 2011 - REVISED JUNE 2013 www.ti.com PG Soft start Thermal Shtdwn UVLO AVIN PVIN PVIN PG control HS lim comp EN* SW SS/TR power control control logic DEF gate drive SW * SW FSW* comp LS lim VOS direct control & compensation ramp _ FB* comparator + timer tON error amplifier DCS - ControlTM * This pin is connected to a pull down resistor internally (see Detailed Description section). AGND PGND PGND Figure 3. TPS62141/2/3 (Fixed Output Voltage) 6 Submit Documentation Feedback Copyright (c) 2011-2013, Texas Instruments Incorporated Product Folder Links: TPS62140 TPS62140A TPS62141 TPS62142 TPS62143 TPS62140, TPS62140A TPS62141, TPS62142, TPS62143 www.ti.com SLVSAJ0B - NOVEMBER 2011 - REVISED JUNE 2013 PARAMETER MEASUREMENT INFORMATION List of Components REFERENCE DESCRIPTION IC 17-V, 2-A step-down converter, QFN MANUFACTURER L1 2.2-H, 3.1-A, 0.165 in x 0.165 in Cin 10-F, 25-V, ceramic Standard Cout 22-F, 6.3-V, ceramic Standard Cs 3300-pF, 25-V, ceramic R1 Dependent on Vout R2 Dependent on Vout R3 100-k, chip, 0603, 1/16W, 1% TPS62140RGT, Texas Instruments XFL4020-222MEB, Coilcraft Standard L1 VIN CIN VOUT SW VIN AVIN VOS EN PG FB R3 COUT R1 TPS62140 SS/TR CSS FB PG DEF AGND FSW PGND R2 Figure 4. Measurement Setup TYPICAL CHARACTERISTICS Table of Graphs DESCRIPTION FIGURE Efficiency vs Output Current, vs Input Voltage 5-16 Output voltage vs Output current (Load regulation), vs Input Voltage (Line regulation) 17, 18 vs Input Voltage 19 vs Output Current 20 Quiescent Current vs Input Voltage 21 Shutdown Current vs Input Voltage Power FET RDS(on) vs Input Voltage (High-Side, Low-Side) Output Voltage Ripple vs output Current Maximum Output Current vs Input Voltage Power Supply Rejection Ratio (PSSR) vs Frequency Switching Frequency 22 25 26 27, 28 PWM-PSM-PWM Mode Transition Waveforms Maximum Ambient Temperature Copyright (c) 2011-2013, Texas Instruments Incorporated 23, 24 29 Load Transient Response 30-32 Start-Up 33, 34 Typical PWM Mode Operation 35 Typical Power Save Mode Operation 36 vs Load Current 37 vs Power Dissipation 38 Submit Documentation Feedback Product Folder Links: TPS62140 TPS62140A TPS62141 TPS62142 TPS62143 7 TPS62140, TPS62140A TPS62141, TPS62142, TPS62143 SLVSAJ0B - NOVEMBER 2011 - REVISED JUNE 2013 www.ti.com EFFICIENCY vs OUTPUT CURRENT EFFICIENCY vs INPUT VOLTAGE 100.0 100.0 90.0 90.0 80.0 70.0 VIN=12V VIN=17V Efficiency (%) Efficiency (%) 80.0 60.0 50.0 40.0 30.0 0.0 0.0001 IOUT=1mA IOUT=1A IOUT=100mA 40.0 0.001 0.01 0.1 Output Current (A) 1 VOUT=5.0V L=2.2uH (XFL4020) Cout=22uF 10.0 0.0 10 7 8 9 10 G001 11 12 13 Input Voltage (V) 14 15 16 Figure 6. Efficiency With 1.25 MHz, Vout = 5 V EFFICIENCY vs OUTPUT CURRENT EFFICIENCY vs INPUT VOLTAGE 100.0 100.0 90.0 90.0 80.0 80.0 70.0 70.0 60.0 VIN=17V 50.0 VIN=12V 40.0 30.0 60.0 IOUT=10mA 50.0 IOUT=1mA 17 G001 Figure 5. Efficiency With 1.25 MHz, Vout = 5 V Efficiency (%) Efficiency (%) IOUT=10mA 50.0 20.0 VOUT=5.0V L=2.2uH (XFL4020) Cout=22uF 10.0 IOUT=1A IOUT=100mA 40.0 30.0 20.0 0.0 0.0001 0.001 0.01 0.1 Output Current (A) 1 VOUT=5.0V L=2.2uH (XFL4020) Cout=22uF 20.0 VOUT=5.0V L=2.2uH (XFL4020) Cout=22uF 10.0 10.0 0.0 10 7 8 9 10 G001 11 12 13 Input Voltage (V) 14 15 16 Figure 8. Efficiency With 2.5 MHz, Vout = 5 V EFFICIENCY vs OUTPUT CURRENT EFFICIENCY vs INPUT VOLTAGE 100.0 100.0 90.0 90.0 80.0 80.0 70.0 VIN=12V 60.0 VIN=17V VIN=5V 50.0 40.0 30.0 17 G001 Figure 7. Efficiency With 2.5 MHz, Vout = 5 V Efficiency (%) Efficiency (%) 60.0 30.0 20.0 70.0 60.0 IOUT=1A IOUT=100mA IOUT=10mA IOUT=1mA 50.0 40.0 30.0 20.0 0.0 0.0001 0.001 0.01 0.1 Output Current (A) 1 Figure 9. Efficiency With 1.25 MHz, Vout = 3.3 V Submit Documentation Feedback VOUT=3.3V L=2.2uH (XFL4020) Cout=22uF 20.0 VOUT=3.3V L=2.2uH (XFL4020) Cout=22uF 10.0 8 70.0 10.0 10 G001 0.0 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Input Voltage (V) G001 Figure 10. Efficiency With 1.25 MHz, Vout = 3.3 V Copyright (c) 2011-2013, Texas Instruments Incorporated Product Folder Links: TPS62140 TPS62140A TPS62141 TPS62142 TPS62143 TPS62140, TPS62140A TPS62141, TPS62142, TPS62143 www.ti.com SLVSAJ0B - NOVEMBER 2011 - REVISED JUNE 2013 EFFICIENCY vs INPUT VOLTAGE 100.0 100.0 90.0 90.0 80.0 80.0 70.0 70.0 60.0 VIN=12V 50.0 Efficiency (%) Efficiency (%) EFFICIENCY vs OUTPUT CURRENT VIN=17V VIN=5V 40.0 30.0 IOUT=1mA IOUT=10mA IOUT=1A 40.0 0.0 0.0001 0.001 0.01 0.1 Output Current (A) 1 VOUT=3.3V L=2.2uH (XFL4020) Cout=22uF 20.0 VOUT=3.3V L=2.2uH (XFL4020) Cout=22uF 10.0 10.0 0.0 10 4 5 6 7 8 G001 9 10 11 12 13 14 15 16 17 Input Voltage (V) G001 Figure 11. Efficiency With 2.5 MHz, Vout = 3.3 V Figure 12. Efficiency With 2.5 MHz, Vout = 3.3 V EFFICIENCY vs OUTPUT CURRENT EFFICIENCY vs INPUT VOLTAGE 100.0 100.0 90.0 90.0 80.0 80.0 70.0 VIN=12V 60.0 50.0 Efficiency (%) Efficiency (%) IOUT=100mA 50.0 30.0 20.0 VIN=17V VIN=5V 40.0 30.0 IOUT=1A 60.0 IOUT=100mA 50.0 IOUT=10mA IOUT=1mA 40.0 0.001 0.01 0.1 Output Current (A) 1 VOUT=1.8V L=2.2uH (XFL4020) Cout=22uF 20.0 VOUT=1.8V L=2.2uH (XFL4020) Cout=22uF 10.0 0.0 0.0001 70.0 30.0 20.0 10.0 0.0 10 3 4 5 6 7 G001 8 9 10 11 12 13 14 15 16 17 Input Voltage (V) G001 Figure 13. Efficiency With 1.25 MHz, Vout = 1.8 V Figure 14. Efficiency With 1.25 MHz, Vout = 1.8 V EFFICIENCY vs OUTPUT CURRENT EFFICIENCY vs INPUT VOLTAGE 100.0 100.0 90.0 90.0 80.0 80.0 70.0 60.0 VIN=12V Efficiency (%) Efficiency (%) 60.0 VIN=17V 50.0 VIN=5V 40.0 30.0 60.0 IOUT=1A 50.0 IOUT=100mA 40.0 IOUT=10mA IOUT=1mA 30.0 20.0 0.001 0.01 0.1 Output Current (A) 1 Figure 15. Efficiency With 1.25 MHz, Vout = 0.9 V Copyright (c) 2011-2013, Texas Instruments Incorporated VOUT=0.9V L=2.2uH (XFL4020) Cout=22uF 20.0 VOUT=0.9V L=2.2uH (XFL4020) Cout=22uF 10.0 0.0 0.0001 70.0 10.0 10 G001 0.0 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Input Voltage (V) G001 Figure 16. Efficiency With 1.25 MHz, Vout = 0.9 V Submit Documentation Feedback Product Folder Links: TPS62140 TPS62140A TPS62141 TPS62142 TPS62143 9 TPS62140, TPS62140A TPS62141, TPS62142, TPS62143 SLVSAJ0B - NOVEMBER 2011 - REVISED JUNE 2013 www.ti.com OUTPUT VOLTAGE vs OUTPUT CURRENT OUTPUT VOLTAGE vs INPUT VOLTAGE 3.40 3.40 Output Voltage (V) Output Voltage (V) VIN=17V 3.35 VIN=12V 3.30 VIN=5V 3.25 VOUT=3.3V L=2.2uH (XFL4020) Cout=22uF 3.20 0.0001 0.001 0.01 0.1 Output Current (A) 1 3.25 VOUT=3.3V L=2.2uH (XFL4020) Cout=22uF 4 7 10 13 Input Voltage (V) 16 G001 Figure 18. Output Voltage Accuracy (Line Regulation) SWITCHING FREQUENCY vs INPUT VOLTAGE SWITCHING FREQUENCY vs OUTPUT CURRENT 4 3.5 Switching Frequency (MHz) IOUT=2A 3 2.5 2 IOUT=0.5A IOUT=1A 1.5 1 VOUT=3.3V L=2.2uH (XFL4020) Cout=22uF 0.5 0 4 6 8 10 12 Input Voltage (V) 14 16 3 2.5 2 1.5 1 0 18 0 0.5 1 Output Current (A) G000 1.5 Figure 20. Switching Frequency INPUT CURRENT vs INPUT VOLTAGE INPUT CURRENT vs INPUT VOLTAGE 5.0 45.0 4.5 40.0 4.0 35.0 30.0 25C 25.0 85C 20.0 15.0 10.0 3.5 85C 3.0 2.5 2.0 1.5 1.0 -40C 5.0 3.0 6.0 9.0 12.0 Input Voltage (V) -40C 25C 0.5 15.0 Figure 21. Quiescent Current Submit Documentation Feedback 2 G000 Figure 19. Switching Frequency 50.0 0.0 0.0 VIN=12V, VOUT=3.3V L=2.2uH (XFL4020) FSW=Low 0.5 Input Current (A) Switching Frequency (MHz) IOUT=100mA Figure 17. Output Voltage Accuracy (Load Regulation) 3.5 Input Current (A) IOUT=1A G001 4 10 IOUT=10mA 3.30 3.20 10 IOUT=1mA 3.35 18.0 20.0 G001 0.0 0.0 3.0 6.0 9.0 12.0 Input Voltage (V) 15.0 18.0 20.0 G001 Figure 22. Shutdown Current Copyright (c) 2011-2013, Texas Instruments Incorporated Product Folder Links: TPS62140 TPS62140A TPS62141 TPS62142 TPS62143 TPS62140, TPS62140A TPS62141, TPS62142, TPS62143 www.ti.com SLVSAJ0B - NOVEMBER 2011 - REVISED JUNE 2013 STATIC DRAIN-SOURCE-RESISTANCE (RDSon) vs INPUT VOLTAGE STATIC DRAIN-SOURCE-RESISTANCE (RDSon) vs INPUT VOLTAGE 100.0 200.0 160.0 125C RDSon Low-Side (m) RDSon High-Side (m) 180.0 140.0 120.0 85C 100.0 25C 80.0 -10C 60.0 -40C 40.0 80.0 125C 60.0 85C 25C 40.0 -10C 20.0 -40C 20.0 0.0 0.0 3.0 6.0 9.0 12.0 Input Voltage (V) 15.0 0.0 0.0 18.0 20.0 6.0 9.0 12.0 Input Voltage (V) OUTPUT CURRENT vs INPUT VOLTAGE 4 Output Current (A) VIN=17V -40C 3.5 VOUT=3.3V, L=2.2uH (XFL4020) Cout=22uF VIN=5V 0.02 2.5 2 85C 1.5 1 0.01 VOUT=3.3V L=2.2uH (XFL4020) Cout=22uF VIN=12V 0 0.2 0.4 0.6 0.8 1 1.2 1.4 Output Current (A) 1.6 1.8 0 2 25C 3 0.5 4 5 6 7 G000 8 9 10 11 12 13 14 15 16 17 Input Voltage (V) G000 Figure 25. Output Voltage Ripple Figure 26. Maximum Output Current POWER SUPPLY REJECTION RATIO vs FREQUENCY POWER SUPPLY REJECTION RATIO vs FREQUENCY 100 100 90 VIN=12V 90 VIN=5V 80 VIN=5V 80 VIN=12V 70 70 VIN=17V PSRR (dB) PSRR (dB) G001 OUTPUT VOLTAGE vs OUTPUT CURRENT 0.03 60 50 40 30 VIN=17V 60 50 40 30 20 20 VOUT=3.3V, IOUT=1A L=2.2uH (XFL4020) Cin=10uF, Cout=22uF 10 0 18.0 20.0 Figure 24. Low-Side Switch Resistance 0.04 0 15.0 Figure 23. High-Side Switch Resistance 0.05 Output Voltage Ripple (V) 3.0 G001 10 100 1k 10k Frequency (Hz) 100k 1M G000 Figure 27. Power-Supply Rejection Ratio, fSW = 2.5 MHz Copyright (c) 2011-2013, Texas Instruments Incorporated VOUT=3.3V, IOUT=0.1A L=2.2uH (XFL4020) Cin=10uF, Cout=22uF 10 0 10 100 1k 10k Frequency (Hz) 100k 1M G000 Figure 28. Power-Supply Rejection Ratio, fSW = 2.5 MHz Submit Documentation Feedback Product Folder Links: TPS62140 TPS62140A TPS62141 TPS62142 TPS62143 11 TPS62140, TPS62140A TPS62141, TPS62142, TPS62143 SLVSAJ0B - NOVEMBER 2011 - REVISED JUNE 2013 12 www.ti.com OUTPUT VOLTAGE vs TIME OUTPUT VOLTAGE vs TIME Figure 29. PWM-PSM-Transition (VIN=12 V, VOUT = 3.3 V With 50 mV/div) Figure 30. Load Transient Response (IOUT= 0.5 to 2 to 0.5 A, VIN = 12 V, VOUT = 3.3 V) OUTPUT VOLTAGE vs TIME OUTPUT VOLTAGE vs TIME Figure 31. Line Transient Response of Figure 30, Rising Edge Figure 32. Line Transient Response of Figure 30, Falling Edge Submit Documentation Feedback Copyright (c) 2011-2013, Texas Instruments Incorporated Product Folder Links: TPS62140 TPS62140A TPS62141 TPS62142 TPS62143 TPS62140, TPS62140A TPS62141, TPS62142, TPS62143 www.ti.com SLVSAJ0B - NOVEMBER 2011 - REVISED JUNE 2013 OUTPUT VOLTAGE vs TIME OUTPUT VOLTAGE vs TIME Figure 33. Start-Up Into 100 mA (VIN = 12 V, VOUT = 3.3 V) Figure 34. Start-Up into 2 A (VIN = 12 V, VOUT = 3.3 V) PWM SIGNALS vs TIME POWER SAVE MODE SIGNALS vs TIME Figure 35. Typical Operation in PWM Mode (IOUT = 1 A) Figure 36. Typical Operation in Power-Save Mode (IOUT = 10 mA) Copyright (c) 2011-2013, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: TPS62140 TPS62140A TPS62141 TPS62142 TPS62143 13 TPS62140, TPS62140A TPS62141, TPS62142, TPS62143 SLVSAJ0B - NOVEMBER 2011 - REVISED JUNE 2013 www.ti.com AMBIENT TEMPERATURE vs OUTPUT CURRENT AMBIENT TEMPERATURE vs OUTPUT POWER 125 Free-Air Temperature (C) Free-Air Temperature (C) 125 115 105 95 TPS62140 EVM L=2.2uH (XFL4020) VIN=12V, VOUT=3.3V 85 75 0 0.5 1 1.5 Output Current (A) Submit Documentation Feedback 105 95 85 75 TPS62140 EVM L=2.2uH (XFL4020) VIN=12V, VOUT=3.3V 65 2 2.5 G000 Figure 37. Maximum Ambient Temperature (fSW = 2.5 MHz) 14 115 55 0 2 4 6 8 Output Power (W) 10 12 G000 Figure 38. Maximum Ambient Temperature (fSW = 2.5 MHz) Copyright (c) 2011-2013, Texas Instruments Incorporated Product Folder Links: TPS62140 TPS62140A TPS62141 TPS62142 TPS62143 TPS62140, TPS62140A TPS62141, TPS62142, TPS62143 www.ti.com SLVSAJ0B - NOVEMBER 2011 - REVISED JUNE 2013 DETAILED DESCRIPTION Device Operation The TPS6214X synchronous switched-mode power converters are based on DCS-ControlTM (Direct Control with Seamless Transition into Power-Save Mode), an advanced regulation topology, that combines the advantages of hysteretic, voltage-mode and current-mode control including an ac loop directly associated with the output voltage. This control loop takes information about output voltage changes and feeds it directly to a fast comparator stage. It sets the switching frequency, which is constant for steady-state operating conditions, and provides immediate response to dynamic load changes. To get accurate dc load regulation, a voltage feedback loop is used. The internally compensated regulation network achieves fast and stable operation with small external components and low-ESR capacitors. The DCS-Control topology supports pulse-width modulation (PWM) mode for medium and heavy load conditions and a power-save mode at light loads. During PWM, it operates at its nominal switching frequency in continuousconduction mode. This frequency is typically about 2.5 MHz with a controlled frequency variation depending on the input voltage. If the load current decreases, the converter enters power-save mode to sustain high efficiency down to very light loads. In power-save mode, the switching frequency decreases linearly with the load current. Because DCS-Control supports both operation modes within one single building block, the transition from PWM to power-save mode is seamless without effects on the output voltage. Fixed output-voltage versions provide the smallest solution size and lowest current consumption, requiring only 3 external components. An internal current limit supports nominal output currents of up to 2A. The TPS6214X family offers both excellent dc voltage and superior load transient regulation, combined with very low output voltage ripple, minimizing interference with RF circuits. Pulse-Width Modulation (PWM) Operation The TPS6214X operates with pulse-width modulation in continuous-conduction mode (CCM) with a nominal switching frequency of 2.5 MHz or 1.25 MHz, selectable with the FSW pin. The frequency variation in PWM is controlled and depends on VIN, VOUT and the inductance. The device operates in PWM mode as long the output current is higher than half the inductor ripple current. To maintain high efficiency at light loads, the device enters power-save mode at the boundary to discontinuous conduction mode (DCM). This happens if the output current becomes smaller than half the inductor ripple current. Power-Save Mode Operation The TPS6214X enters its built-in power-save mode seamlessly if the load current decreases. This secures a high efficiency in light-load operation. The device remains in power-save mode as long as the inductor current is discontinuous. In power-save mode, the switching frequency decreases linearly with the load current, maintaining high efficiency. The transition into and out of power-save mode happens within the entire regulation scheme and is seamless in both directions. TPS6214X includes a fixed-on-time circuit. The on-time, in steady-state operation, can be estimated as: t ON = VOUT x 400ns V IN (1) For very small output voltages, an absolute minimum on-time of about 80 ns is kept to limit switching losses. The operating frequency is thereby reduced from its nominal value, which keeps efficiency high. Using tON, the typical peak inductor current in power-save mode can be approximated by: I LPSM ( peak ) = (V IN - VOUT ) x t ON L (2) When VIN decreases to typically 15% above VOUT, the TPS6214X does not enter power-save mode, regardless of the load current. The device maintains output regulation in PWM mode. Copyright (c) 2011-2013, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: TPS62140 TPS62140A TPS62141 TPS62142 TPS62143 15 TPS62140, TPS62140A TPS62141, TPS62142, TPS62143 SLVSAJ0B - NOVEMBER 2011 - REVISED JUNE 2013 www.ti.com 100% Duty-Cycle Operation The duty cycle of the buck converter is given by D = Vout/Vin and increases as the input voltage comes close to the output voltage. In this case, the device starts 100% duty-cycle operation, turning on the high-side switch 100% of the time. The high-side switch stays turned on as long as the output voltage is below the internal setpoint. This allows the conversion of small input-to-output voltage differences, e.g., for longest operation time of battery-powered applications. In 100% duty-cycle mode, the low-side FET is switched off. The minimum input voltage to maintain output voltage regulation, depending on the load current and the output voltage level, can be calculated as: VIN (min) = VOUT (min) + I OUT (RDS ( on ) + RL ) (3) where IOUT is the output current. RDS(on) is the RDS(on) of the high-side FET. RL is the dc resistance of the inductor used. Enable / Shutdown (EN) When the enable pin (EN) is set High, the device starts operation. Shutdown is forced if EN is pulled Low with a shutdown current of typically 1.5 A. During shutdown, the internal power MOSFETs as well as the entire control circuitry are turned off. The internal resistive divider pulls down the output voltage smoothly. An internal pulldown resistor of about 400 k is connected and keeps EN logic Low if the pin is floating. It is disconnected if the pin is High. Connecting the EN pin to an appropriate output signal of another power rail provides sequencing of multiple power rails. Soft-Start / Tracking (SS/TR) The internal soft-start circuitry controls the output voltage slope during start-up. This avoids excessive inrush current and ensures a controlled output-voltage rise time. It also prevents unwanted voltage drops from highimpedance power sources or batteries. When EN is set to start device operation, the device starts switching after a delay of about 50 s, and VOUT rises with a slope controlled by an external capacitor connected to the SS/TR pin. See Figure 33 and Figure 34 for typical start-up operation. The slope can be controlled by an external capacitor connected to the SS/TR pin. Connecting SS/TR directly to AVIN provides fastest start-up behavior. The TPS6214X can start into a pre-biased output. During monotonic pre-biased startup, both the power MOSFETs are not allowed to turn on until the device internal ramp sets an output voltage above the pre-bias voltage. As long as the output is below about 0.5 V, a reduced current limit of typically 1.6 A is set internally. If the device is set to shutdown (EN = GND), undervoltage lockout, or thermal shutdown, an internal resistor pulls the SS/TR pin down to ensure a proper low level. Returning from those states causes a new start-up sequence as set by the SS/TR connection. A voltage supplied to SS/TR can be used for tracking a master voltage. The output voltage follows this voltage in both directions, up and down (see APPLICATION INFORMATION). Current Limit and Short Circuit Protection The TPS6214X devices are protected against heavy load and short-circuit events. If a short circuit is detected (VOUT drops below 0.5 V), the current limit is reduced to 1.6 A, typically. If the output voltage rises above 0.5 V, the device runs in normal operation again. At heavy loads, the current limit determines the maximum output current. If the current limit is reached, the high-side FET is turned off. Avoiding shoot-through current, the lowside FET is switched on to sink the inductor current. The high-side FET turns on again only if the current in the low-side FET has decreased below the low-side current-limit threshold. The output current of the device is limited by the current limit (see ELECTRICAL CHARACTERISTICS). Due to internal propagation delay, the actual current can exceed the static current limit during that time. The dynamic current limit can be calculated as follows: I peak ( typ ) = I LIMF + 16 VL x t PD L Submit Documentation Feedback (4) Copyright (c) 2011-2013, Texas Instruments Incorporated Product Folder Links: TPS62140 TPS62140A TPS62141 TPS62142 TPS62143 TPS62140, TPS62140A TPS62141, TPS62142, TPS62143 www.ti.com SLVSAJ0B - NOVEMBER 2011 - REVISED JUNE 2013 where ILIMF is the static current limit, specified in the ELECTRICAL CHARACTERISTICS L is the inductor value VL is the voltage across the inductor (VIN - VOUT) tPD is the internal propagation delay The current limit can exceed static values, especially if the input voltage is high and very small inductances are used. The dynamic high-side switch peak current can be calculated as follows: (V - VOUT )x 30ns I peak (typ ) = I LIMF + IN L (5) Power Good (PG) The TPS6214X has a built-in power-good (PG) function to indicate whether the output voltage has reached its appropriate level or not. The PG signal can be used for start-up sequencing of multiple rails. The PG pin is an open-drain output that requires a pullup resistor (to any voltage below 7 V). It can sink 2 mA of current and maintain its specified logic-low level. It is high-impedance when the device is turned off due to EN, UVLO, or thermal shutdown. TPS62140A features PG=Low in this case and can be used to actively discharge Vout (see Figure 51). VIN must remain present for the PG pin to stay Low. Pin-Selectable Output Voltage (DEF) The output voltage of the TPS6214X devices can be increased by 5% above the nominal voltage by setting the DEF pin to High (1). When DEF is Low, the device regulates to the nominal output voltage. Increasing the nominal voltage allows adapting the power supply voltage to the variations of the application hardware. More detailed information on voltage margining using TPS6214X can be found in SLVA489. A pull down resistor of about 400kOhm is internally connected to the pin, to ensure a proper logic level if the pin is high impedance or floating after initially set to Low. The resistor is disconnected if the pin is set High. Frequency Selection (FSW) To get high power density with very small solution size, a high switching frequency allows the use of small external components for the output filter. However switching losses increase with the switching frequency. If efficiency is the key parameter, more than solution size, the switching frequency can be set to half (1.25 MHz typ.) by pulling FSW to High. It is mandatory to start with FSW=Low to limit inrush current, which can be done by connecting to VOUT or PG. Running with lower frequency a higher efficiency, but also a higher output voltage ripple, is achieved. Pull FSW to Low for high frequency operation (2.5 MHz typ.). To get low ripple and full output current at the lower switching frequency, it's recommended to use an inductor of at least 2.2uH. The switching frequency can be changed during operation, if needed. A pull down resistor of about 400kOhm is internally connected to the pin, acting the same way as at the DEF Pin (see above). Undervoltage Lockout (UVLO) If the input voltage drops, the undervoltage lockout prevents incorrect operation of the device by switching off both the power FETs. The undervoltage lockout threshold is set typically to 2.7 V. The device is fully operational for voltages above the UVLO threshold and turns off if the input voltage trips the threshold. The converter starts operation again once the input voltage exceeds the threshold by a hysteresis of typically 200 mV. Thermal Shutdown The junction temperature (TJ) of the device is monitored by an internal temperature sensor. If TJ exceeds 160C (typ), the device goes into thermal shutdown. Both the high-side and low-side power FETs are turned off and PG goes high-impedance. When TJ decreases below the hysteresis amount, the converter resumes normal operation, beginning with soft start. To avoid unstable conditions, a hysteresis of typically 20C is implemented on the thermal shutdown temperature. (1) Maximum allowed voltage is 7 V. Therefore it is recommended to connect it to VOUT or PG, not VIN. Copyright (c) 2011-2013, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: TPS62140 TPS62140A TPS62141 TPS62142 TPS62143 17 TPS62140, TPS62140A TPS62141, TPS62142, TPS62143 SLVSAJ0B - NOVEMBER 2011 - REVISED JUNE 2013 www.ti.com APPLICATION INFORMATION The following information is intended to be a guideline through the individual power-supply design process. Programming the Output Voltage While the output voltage of the TPS62140 is adjustable, the TPS62141/2/3 are programmed to fixed output voltages. For fixed output versions, the FB pin is pulled down internally and may be left floating. It is recommended to connect to AGND to improve thermal resistance. The adjustable version can be programmed for output voltages from 0.9 V to 6 V by using a resistive divider from VOUT to AGND. The voltage at the FB pin is regulated to 800 mV. The value of the output voltage is set by the selection of the resistive divider from Equation 6 (see Figure 4). It is recommended to choose resistor values which allow a current of at least 2 A, meaning the value of R2 should not exceed 400 k. Lower resistor values are recommended for highest accuracy and most-robust design. For applications requiring lowest current consumption, the use of fixed outputvoltage versions is recommended. aeV o R1 = R 2 cc OUT - 1// V e REF o (6) In case the FB pin is opened, the device clamps the output voltage at the VOS pin internally to about 7.4 V. External Component Selection The external components have to fulfill the needs of the application, but also the stability criteria of the devices control loop. The TPS6214X is optimized to work within a range of external components. The LC output filters inductance and capacitance have to be considered in conjunction, creating a double pole, responsible for the corner frequency of the converter (see Output Filter and Loop Stabilitysection). Table 1 can be used to simplify the output filter component selection. Table 1. Recommended LC Output Filter Combinations (1) 4.7 F 10 F 22 F 47 F 100 F 200 F (2) 400 F 0.47 H 1 H 2.2 H 3.3 H 4.7 H (1) (2) The values in the table are nominal values. This LC combination is the standard value and recommended for most applications. spacing TPS6214X can be run with an inductor as low as 1 H or 2.2 H. FSW should be set Low in this case. However, for applications running with the low-frequency setting (FSW = High) or with low input voltages, 3.3 H is recommended. More detailed information on further LC combinations can be found in SLVA463. Inductor Selection The inductor selection is affected by several effects like inductor ripple current, output ripple voltage, PWM-toPSM transition point, and efficiency. In addition, the inductor selected must be rated for appropriate saturation current and dc resistance (DCR). Equation 7 and Equation 8 calculate the maximum inductor current under static load conditions. spacing I L(max) = I OUT (max) + 18 DI L(max) 2 Submit Documentation Feedback (7) Copyright (c) 2011-2013, Texas Instruments Incorporated Product Folder Links: TPS62140 TPS62140A TPS62141 TPS62142 TPS62143 TPS62140, TPS62140A TPS62141, TPS62142, TPS62143 www.ti.com SLVSAJ0B - NOVEMBER 2011 - REVISED JUNE 2013 DI L(max) = VOUT V ae c 1 - OUT V c IN (max) xc L(min) x f SW c c e o / / / / / o (8) where IL(max) is the maximum inductor current IL is the peak-to-peak inductor ripple current L(min) is the minimum effective inductor value fSW is the actual PWM switching frequency spacing Calculating the maximum inductor current using the actual operating conditions gives the minimum required inductor saturation current. It is recommended to add a margin of about 20%. A larger inductor value is also useful to get lower ripple current, but increases the transient response time and size as well. The following inductors have been used with the TPS6214X and are recommended for use: Table 2. List of Inductors (1) Type Inductance [H] Current [A] (1) Dimensions [L x B x H] mm MANUFACTURER XFL4020-222ME_ 2.2 H, 20% 3.5 4 x 4 x 2.1 Coilcraft XFL4020-332ME_ 3.3 H, 20% 2.9 4 x 4 x 2.1 Coilcraft IHLP1212BZ-11 2.2 H, 20% 3.0 3 x 3.6 x 2 Vishay IHLP1616AB-11 2.2 H, 20% 2.75 4.05 x 4.45 x 1.2 Vishay DEM4518C 1235AS-H-3R3M 3.3 H, 20% 2.5 4.5 x 4.7 x 1.9 Toko Lower of IRMS at 40C rise or ISAT at 30% drop. spacing The inductor value also determines the load current at which the power-save mode is entered: I load ( PSM ) = 1 DI L 2 (9) Using Equation 8, this current level can be adjusted by changing the inductor value. Capacitor Selection Output Capacitor The recommended value for the output capacitor is 22 F. The architecture of the TPS6214X allows the use of tiny ceramic output capacitors with low equivalent series resistance (ESR). These capacitors provide low outputvoltage ripple and are recommended. To keep its low resistance up to high frequencies and to get narrow capacitance variation with temperature, it is recommended to use X7R or X5R dielectric. Using a higher value can have some advantages, like smaller voltage ripple and a tighter dc output accuracy in power-save mode (see SLVA463). Note: In power-save mode, the output voltage ripple depends on the output capacitance, its ESR and the peak inductor current. Using ceramic capacitors provides small ESR and low ripple. Input Capacitor For most applications, 10 F is sufficient and is recommended, though a larger value reduces input-current ripple further. The input capacitor buffers the input voltage for transient events and also decouples the converter from the supply. A low-ESR multilayer ceramic capacitor is recommended for best filtering and should be placed between PVIN and PGND as close as possible to those pins. Even though AVIN and PVIN must be supplied from the same input source, it is recommended to place a capacitance of 0.1 uF from AVIN to AGND, to avoid potential noise coupling. Copyright (c) 2011-2013, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: TPS62140 TPS62140A TPS62141 TPS62142 TPS62143 19 TPS62140, TPS62140A TPS62141, TPS62142, TPS62143 SLVSAJ0B - NOVEMBER 2011 - REVISED JUNE 2013 www.ti.com Soft-Start Capacitor A capacitance connected between the SS/TR pin and AGND allows a user-programmable start-up slope of the output voltage. A constant-current source provides 2.5 A to charge the external capacitance. The capacitor required for a given soft-start ramp time for the output voltage is given by: C SS = t SS x 2.5mA 1.25V [F ] (10) where CSS is the capacitance (F) required at the SS/TR pin and tSS is the desired soft-start ramp time (s). spacing NOTE DC bias effect: High-capacitance ceramic capacitors have a dc bias effect, which has a strong influence on the final effective capacitance. Therefore, the right capacitor value must be chosen carefully. Package size and voltage rating in combination with dielectric material are responsible for differences between the rated capacitor value and the effective capacitance. spacing Tracking Function If a tracking function is desired, the SS/TR pin can be used for this purpose by connecting it to an external tracking voltage. The output voltage tracks that voltage. If the tracking voltage is between 50 mV and 1.2 V, the FB pin tracks the SS/TR pin voltage as described in Equation 11 and shown in Figure 39. spacing VFB 0.64 x VSS / TR (11) VSS/TR [V] 1.2 0.8 0.4 0.2 0.4 0.6 0.8 VFB [V] Figure 39. Voltage Tracking Relationship Once the SS/TR pin voltage reaches about 1.2V, the internal voltage is clamped to the internal feedback voltage and device goes to normal regulation. This works for rising and falling tracking voltages with the same behavior, as long as the input voltage is inside the recommended operating conditions. For decreasing SS/TR pin voltage, the device doesn't sink current from the output. So, the resulting decrease of the output voltage may be slower than the SS/TR pin voltage if the load is light. When driving the SS/TR pin with an external voltage, do not exceed the voltage rating of the SS/TR pin which is VIN+0.3V. If the input voltage drops into undervoltage lockout or even down to zero, the output voltage goes to zero, independent of the tracking voltage. Figure 40 shows how to connect devices to get ratiometric and simultaneous sequencing by using the tracking function. spacing 20 Submit Documentation Feedback Copyright (c) 2011-2013, Texas Instruments Incorporated Product Folder Links: TPS62140 TPS62140A TPS62141 TPS62142 TPS62143 TPS62140, TPS62140A TPS62141, TPS62142, TPS62143 www.ti.com SLVSAJ0B - NOVEMBER 2011 - REVISED JUNE 2013 VOUT1 PVIN SW AVIN VOS EN PG TPS62140 SS/TR FB DEF AGND FSW PGND PVIN SW AVIN VOS VOUT2 R1 EN PG TPS62140 SS/TR R2 FB DEF AGND FSW PGND Figure 40. Sequence for Ratiometric and Simultaneous Startup The resistive divider of R1 and R2 can be used to change the ramp rate of VOUT2 faster, slower, or the same as VOUT1. A sequential start-up is achieved by connecting the PG pin of VOUT1 to the EN pin of VOUT2. A ratiometric start-up sequence happens if both supplies are sharing the same soft-start capacitor. Equation 10 calculates the soft-start time, though the SS/TR current must be doubled. Details about these and other tracking and sequencing circuits are found in SLVA470. Note: If the voltage at the FB pin is below its typical value of 0.8 V, the output voltage accuracy may have a wider tolerance than specified. Output Filter and Loop Stability The devices of the TPS6214X family are internally compensated to be stable with L-C filter combinations corresponding to a corner frequency to be calculated with Equation 12: f LC = 1 2p L x C (12) Proven nominal values for inductance and ceramic capacitance are given in Table 1 and are recommended for use. Different values may work, but care must be taken on the loop stability, which is affected. More information including a detailed L-C stability matrix can be found in SLVA463. The TPS6214X devices, both fixed and adjustable versions, include an internal 25 pF feed-forward capacitor, connected between the VOS and FB pins. This capacitor impacts the frequency behavior and sets a pole and zero in the control loop with the resistors of the feedback divider, per equations Equation 13 and Equation 14: spacing f zero = 1 2p x R1 x 25 pF Copyright (c) 2011-2013, Texas Instruments Incorporated (13) Submit Documentation Feedback Product Folder Links: TPS62140 TPS62140A TPS62141 TPS62142 TPS62143 21 TPS62140, TPS62140A TPS62141, TPS62142, TPS62143 SLVSAJ0B - NOVEMBER 2011 - REVISED JUNE 2013 www.ti.com spacing f pole = 1 2p x 25 pF ae 1 1 o // x cc + e R1 R 2 o (14) spacing Though the TPS6214X devices are stable without the pole and zero being in a particular location, adjusting their location to the specific needs of the application can provide better performance in power-save mode and/or improved transient response. An external feed-forward capacitor can also be added. A more detailed discussion on the optimization for stability vs transient response can be found in SLVA289 and SLVA466. Layout Considerations A proper layout is critical for the operation of a switched-mode power supply, even more at high switching frequencies. Therefore, the PCB layout of the TPS6214X demands careful attention to ensure operation and to get the performance specified. A poor layout can lead to issues like poor regulation (both line and load), stability and accuracy weaknesses, increased EMI radiation, and noise sensitivity. See Figure 41 for the recommended layout of the TPS6214X, which is designed for common external ground connections. Therefore both AGND and PGND pins are directly connected to the Exposed Thermal Pad. On the PCB, the direct common ground connection of AGND and PGND to the Exposed Thermal Pad and the system ground (ground plane) is mandatory. Also connect the VOS pin in the shortest way to VOUT at the output capacitor. Provide low inductive and resistive paths for loops with high di/dt. Therefore, paths conducting the switched load current should be as short and wide as possible. Provide low capacitive paths (with respect to all other nodes) for wires with high dv/dt. Therefore, the input and output capacitance should be placed as close as possible to the IC pins and parallel wiring over long distances as well as narrow traces should be avoided. Loops which conduct an alternating current should outline an area as small as possible, as this area is proportional to the energy radiated. Sensitive nodes like FB and VOS need to be connected with short wires and not nearby high dv/dt signals (that is, SW). As they carry information about the output voltage, they should be connected as close as possible to the actual output voltage (at the output capacitor). The capacitor on the SS/TR pin and on AVIN as well as the FB resistors, R1 and R2, should be kept close to the IC and connect directly to those pins and the system ground plane. The Exposed Thermal Pad must be soldered to the circuit board for mechanical reliability and to achieve appropriate power dissipation. The recommended layout is implemented on the EVM and shown in its Users Guide, SLVU437. Additionally, the EVM Gerber data are available for download here, SLVC394. 22 Submit Documentation Feedback Copyright (c) 2011-2013, Texas Instruments Incorporated Product Folder Links: TPS62140 TPS62140A TPS62141 TPS62142 TPS62143 TPS62140, TPS62140A TPS62141, TPS62142, TPS62143 www.ti.com SLVSAJ0B - NOVEMBER 2011 - REVISED JUNE 2013 GND R2 8 C PVIN AVIN 7 R1 6 5 9 4 10 3 11 2 12 1 13 CIN 14 15 PG 16 EN L1 to GND plane VOUT COUT to AGND GND Figure 41. Layout Example THERMAL INFORMATION Implementation of integrated circuits in low-profile and fine-pitch surface-mount packages typically requires special attention to power dissipation. Many system-dependent issues such as thermal coupling, airflow, added heat sinks and convection surfaces, and the presence of other heat-generating components affect the powerdissipation limits of a given component. Three basic approaches for enhancing thermal performance are listed below: * Improving the power dissipation capability of the PCB design * Improving the thermal coupling of the component to the PCB by soldering the exposed thermal pad * Introducing airflow in the system For more details on how to use the thermal parameters, see the application notes: Thermal Characteristics Application Note (SZZA017), and (SPRA953). The TPS6214X is designed for a maximum operating junction temperature (TJ) of 125C. Therefore, the maximum output power is limited by the power losses that can be dissipated over the actual thermal resistance, given by the package and the surrounding PCB structures. If the thermal resistance of the package is given, the size of the surrounding copper area and a proper thermal connection of the IC can reduce the thermal resistance. To get improved thermal behavior, it is recommended to use top layer metal to connect the device with wide and thick metal lines. Internal ground layers can connect to vias directly under the IC for improved thermal performance. If short-circuit or overload conditions are present, the device is protected by limiting internal power dissipation. Experimental data, taken from the TPS62140 EVM, shows the maximum ambient temperature (without additional cooling like airflow or heat sink), that can be allowed to limit the junction temperature to at most 125C (see Figure 37). Copyright (c) 2011-2013, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: TPS62140 TPS62140A TPS62141 TPS62142 TPS62143 23 TPS62140, TPS62140A TPS62141, TPS62142, TPS62143 SLVSAJ0B - NOVEMBER 2011 - REVISED JUNE 2013 www.ti.com Application Example As Power LED Supply The TPS62140 can be used as a power supply for power LEDs. The FB pin can be easily set down to lower values than nominal by using the SS/TR pin. With that, the voltage drop on the sense resistor is low to avoid excessive power loss. Because this pin provides 2.5 A, the feedback pin voltage can be adjusted by an external resistor per Equation 15. This drop, proportional to the LED current, is used to regulate the output voltage (anode voltage) to a proper level to drive the LED. Both analog and PWM dimming are supported with the TPS62140. Figure 42 shows an application circuit, tested with analog dimming: spacing (4 .. 17) V 2.2 H PVIN SW AVIN VOS PG EN 10uF ADIM 22uF TPS62140 FB SS/TR 187k DEF AGND FSW PGND 0.15R Figure 42. Single Power LED Supply spacing The resistor at SS/TR sets the FB voltage to a level of about 300 mV and is calculated from Equation 15. spacing V FB = 0.64 x 2.5mA x R SS / TR (15) spacing The device now supplies a constant current, set by the resistor at the FB pin, by regulating the output voltage accordingly. The minimum input voltage must be rated according to the forward voltage needed by the LED used. More information is available in the application note SLVA451. spacing Typical Applications spacing spacing (5 .. 17)V 5V / 2A 2.2 H 10uF PVIN SW AVIN VOS 100k PG EN 22uF TPS62143 SS/TR 3.3nF FB DEF AGND FSW PGND Figure 43. 5-V/2-A Power Supply spacing spacing spacing spacing 24 Submit Documentation Feedback Copyright (c) 2011-2013, Texas Instruments Incorporated Product Folder Links: TPS62140 TPS62140A TPS62141 TPS62142 TPS62143 TPS62140, TPS62140A TPS62141, TPS62142, TPS62143 www.ti.com SLVSAJ0B - NOVEMBER 2011 - REVISED JUNE 2013 spacing spacing spacing (3.3 .. 17)V 3.3V / 2A 2.2 H 10uF PVIN SW AVIN VOS 100k PG EN 22uF TPS62142 FB SS/TR 3.3nF DEF AGND FSW PGND Figure 44. 3.3-V/2-A Power Supply spacing spacing spacing (3 .. 17)V 2.5V / 2A 2.2 H PVIN SW AVIN VOS 100k PG EN 10uF 390k 22uF TPS62140 FB SS/TR 3.3nF DEF AGND FSW PGND 180k Figure 45. 2.5-V/2-A Power Supply spacing spacing spacing (3 .. 17)V 1.8V / 2A 2.2 H 10uF PVIN SW AVIN VOS PG EN 100k 22uF TPS62141 SS/TR 3.3nF FB DEF AGND FSW PGND Figure 46. 1.8-V/2-A Power Supply spacing spacing spacing spacing spacing Copyright (c) 2011-2013, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: TPS62140 TPS62140A TPS62141 TPS62142 TPS62143 25 TPS62140, TPS62140A TPS62141, TPS62142, TPS62143 SLVSAJ0B - NOVEMBER 2011 - REVISED JUNE 2013 www.ti.com spacing spacing spacing (3 .. 17)V 1.5V / 2A 2.2 H PVIN SW AVIN VOS 100k PG EN 10uF 130k 22uF TPS62140 FB SS/TR 3.3nF DEF AGND FSW PGND 150k Figure 47. 1.5-V/2-A Power Supply spacing spacing spacing (3 .. 17)V 1.2V / 2A 2.2 H PVIN SW AVIN VOS 100k PG EN 10uF 75k 22uF TPS62140 FB SS/TR 3.3nF DEF AGND FSW PGND 150k Figure 48. 1.2-V/2-A Power Supply spacing spacing spacing 1V / 2A 2.2 H PVIN SW AVIN VOS 100k PG EN 10uF 51k 22uF TPS62140 SS/TR 3.3nF FB DEF AGND FSW PGND 200k Figure 49. 1-V/2-A Power Supply 26 Submit Documentation Feedback Copyright (c) 2011-2013, Texas Instruments Incorporated Product Folder Links: TPS62140 TPS62140A TPS62141 TPS62142 TPS62143 TPS62140, TPS62140A TPS62141, TPS62142, TPS62143 www.ti.com SLVSAJ0B - NOVEMBER 2011 - REVISED JUNE 2013 Application Example As Inverting Power Supply spacing The TPS62140 can be used as inverting power supply by rearranging external circuitry as shown in Figure 50. As the former GND node now represents a voltage level below system ground, the voltage difference between VIN and VOUT has to be limited for operation to the maximum supply voltage of 17V (see Equation 16). spacing V IN + VOUT V IN max (16) spacing 10uF 2.2H (3 .. 13.7)V PVIN SW AVIN VOS 10uF PG EN 1.21M TPS62140 SS/TR 22uF FB 3.3nF DEF AGND FSW PGND 383k -3.3V Figure 50. -3.3V Inverting Power Supply spacing The transfer function of the inverting power supply configuration differs from the buck mode transfer function, incorporating a Right Half Plane Zero additionally. The loop stability has to be adapted and an output capacitance of at least 22F is recommended. A detailed design example is given in SLVA469. spacing Active Output Discharge spacing The TPS62140A pulls the PG pin Low, when the device is shut down by EN, UVLO or thermal shutdown. Connecting PG to Vout through a resistor can be used to discharge Vout in those cases (see Figure 51). The discharge rate can be adjusted by R3, which is also used to pull up the PG pin in normal operation. For reliability, keep the maximum current into the PG pin less than 10mA. spacing (3 .. 17)V 1 / 2.2 H PVIN Vout / 2A SW TPS62140A AVIN 10uF 3.3nF VOS EN PG SS/TR FB DEF AGND FSW PGND R3 R1 22uF R2 Figure 51. Discharge Vout through PG pin Copyright (c) 2011-2013, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: TPS62140 TPS62140A TPS62141 TPS62142 TPS62143 27 TPS62140, TPS62140A TPS62141, TPS62142, TPS62143 SLVSAJ0B - NOVEMBER 2011 - REVISED JUNE 2013 www.ti.com REVISION HISTORY Changes from Original (November 2011) to Revision A Page * Added values to the Initial output voltage accuracy for TA = -10C to 85C ........................................................................ 3 * Changed the description of the AGND pin, and added Note 3. ........................................................................................... 4 * Added text to the Power-Save Mode Operation section following Equation 1 ................................................................... 15 * Changed the Layout Considerations section ...................................................................................................................... 22 * Changed Figure 41 ............................................................................................................................................................. 23 Changes from Revision A (October 2012) to Revision B Page * Added new device version TPS62140A to the data sheet ................................................................................................... 1 * Added device TPS62140A to Ordering Info table ................................................................................................................. 2 * Added text to Power Good section regarding the TPS62140A function ............................................................................. 17 * Added pin option to the footnote for Pin-Selectable Output (DEF) section. ....................................................................... 17 * Added text to Frequency Selection (FSW) section regarding pin control. .......................................................................... 17 * Added text to Tracking Function section for clarification. ................................................................................................... 20 * Added application example with regard to new version TPS62140A. ................................................................................ 27 28 Submit Documentation Feedback Copyright (c) 2011-2013, Texas Instruments Incorporated Product Folder Links: TPS62140 TPS62140A TPS62141 TPS62142 TPS62143 PACKAGE OPTION ADDENDUM www.ti.com 23-Jul-2013 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish (2) MSL Peak Temp Op Temp (C) Device Marking (3) (4/5) TPS62140ARGTR ACTIVE QFN RGT 16 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 85 PA7I TPS62140ARGTT ACTIVE QFN RGT 16 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 85 PA7I TPS62140RGTR ACTIVE QFN RGT 16 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 85 QTZ TPS62140RGTT ACTIVE QFN RGT 16 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 85 QTZ TPS62141RGTR ACTIVE QFN RGT 16 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 85 QWA TPS62141RGTT ACTIVE QFN RGT 16 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 85 QWA TPS62142RGTR ACTIVE QFN RGT 16 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 85 QWB TPS62142RGTT ACTIVE QFN RGT 16 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 85 QWB TPS62143RGTR ACTIVE QFN RGT 16 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 85 QWC TPS62143RGTT ACTIVE QFN RGT 16 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 85 QWC (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) Addendum-Page 1 Samples PACKAGE OPTION ADDENDUM www.ti.com 23-Jul-2013 (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. (4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. 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Addendum-Page 2 PACKAGE MATERIALS INFORMATION www.ti.com 11-Jul-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing TPS62140ARGTR QFN RGT 16 TPS62140ARGTT QFN RGT TPS62140RGTR QFN RGT TPS62140RGTT QFN TPS62141RGTR SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 3000 330.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2 16 250 180.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2 16 3000 330.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2 RGT 16 250 180.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2 QFN RGT 16 3000 330.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2 TPS62141RGTT QFN RGT 16 250 180.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2 TPS62142RGTR QFN RGT 16 3000 330.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2 TPS62142RGTT QFN RGT 16 250 180.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2 TPS62143RGTR QFN RGT 16 3000 330.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2 TPS62143RGTT QFN RGT 16 250 180.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2 Pack Materials-Page 1 PACKAGE MATERIALS INFORMATION www.ti.com 11-Jul-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TPS62140ARGTR QFN RGT 16 3000 552.0 367.0 36.0 TPS62140ARGTT QFN RGT 16 250 552.0 185.0 36.0 TPS62140RGTR QFN RGT 16 3000 552.0 367.0 36.0 TPS62140RGTT QFN RGT 16 250 552.0 185.0 36.0 TPS62141RGTR QFN RGT 16 3000 552.0 367.0 36.0 TPS62141RGTT QFN RGT 16 250 552.0 185.0 36.0 TPS62142RGTR QFN RGT 16 3000 552.0 367.0 36.0 TPS62142RGTT QFN RGT 16 250 552.0 185.0 36.0 TPS62143RGTR QFN RGT 16 3000 552.0 367.0 36.0 TPS62143RGTT QFN RGT 16 250 552.0 185.0 36.0 Pack Materials-Page 2 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. 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