R1224N Series 18.5V Input PWM/VFM Step-down DC/DC Controller with Ext. Tr. The R1224N Series are low supply current CMOS-based PWM/VFM step-down DC/DC controller with an external output transistor. By simply using a power transistor, an inductor, a diode, and a capacitor as external components, a high-efficiency step-down DC/DC converter can be easily configured. The PWM/VFM alternative circuit automatically switches to VFM control in the smaller output current range and provides high efficiency even in the smaller output current range. The version with fixed PWM control and adjustable output voltage with an external resistor is also available. The reset type protection circuit embedded into the device limits output current by repeatedly triggering the soft start circuit when the oscillator maximum duty cycle continues for a predetermined period of time. When the oscillator maximum duty cycle ends, normal operation is resumed automatically. R1224N also includes an under-voltage lockout circuit (UVLO) that stops DC/DC operation and prevents malfunction when the supply voltage falls below the UVLO detect voltage and reduces supply current. FEATURES * Supply Current (IDD1)****************** Typ. 20A (E, F, L, M Versions), Typ. 30A (G Version), * * * * Output Voltage Accuracy**************** 2% * Oscillator Frequency (fosc) ************** 180kHz, 300kHz, 500kHz * Oscillator Maximum Duty Cycle (Maxduty) *** Min. 100% * UVLO Detect Voltage (VUVLO) ********* Typ. 2.0V * Soft Start Time (tstart) *********************** Typ. 10ms * Reset Protection Circuit ***************** Delay time for protection Typ. 40A (H Version) (VIN=VOUT=18.5V) Standby Current (Istandby) ************ Max. 0.5A (In standby) Input Voltage Range (VIN) ********** 2.3V to 18.5V Output Voltage Range (VOUT)***** 1.2V to 6.0V (internally fixed R1224Nxx2E/F/L) Externally adjustable (Feedback voltage : 1.0V, R1224Nxx2G/H/M) Typ. 15ms * Package ***************************************** SOT-23-5 BLOCK DIAGRAMS R1224Nxx2E/F/L R1224Nxx2G/H/M (Internally fixed output voltage type) (Externally adjustable output voltage type) OSC 5 EXT 4 3 - Amp + + PWM/VFM CONTROL VOUT OSC VIN 5 EXT 4 - Amp + + Vref Soft Start Protection UVLO 1 CE Protection Vref UVLO - 2 2 GND GND SELECTION GUIDE 1 CE Vref Chip Enable + Vref - TYPICAL APPLICATIONS R1224Nxx2E/F/L Halogen Free Package Q'ty per Reel Part No. SOT-23-5 3,000 pcs R1224N.xx.2. -TR-FE R1224Nxx2G/H/M L L PMOS C1 R1 4 5 VIN EXT VOUT 1 CE GND C2 3 SD + - C3 2 4 5 VIN EXT 1 CE GND R1 C2 VFB R4 C4 R3 3 SD 2 R2 + - C3 CE CONTROL CE CONTROL PMOS : HAT1044M, L : 27H, SD : RB063L-30, C1 : 10F, C2 : 0.1F, C3 : 47F, R1 : 10 PACKAGE (Top View) PMOS + - C1 LOAD .xx. : Specify the output voltage within the range of 1.2V (.12.) to 6.0V (.60.) in 0.1V steps. (For externally adjustable output voltage type, feedback voltage of 1.0V(.10.)) .. : Specify the oscillator frequency, modulation method, output voltage adjustment. .E.: 300kHz, PWM/VFM, fixed output voltage .F. : 500kHz, PWM/VFM, fixed output voltage .G.: 300kHz, fixed PWM, adjustable output voltage .H.: 500kHz, fixed PWM, adjustable output voltage .L. : 180kHz, PWM/VFM, fixed output voltage .M.: 180kHz, fixed PWM, adjustable output voltage PMOS : HAT1044M, L : 27H, SD : RB063L-30, C1 : 10F, C2 : 0.1F, C3 : 47F, C4 : 1000pF, R1 : 10, R3 : 2.7k, Output voltage at 2.5VR2 : 22k, R4 : 33k TYPICAL CHARACTERISTIC SOT-23-5 5 VFB Soft Start Chip Enable + 3 LOAD VIN R1224N332E 4 100 Efficiency vs. Output Current VIN=7V, L=CDRH127(10H) 90 1 1 2 3 4 5 2 3 CE GND VOUT or VFB EXT VIN Efficiency (%) 80 70 60 50 40 30 20 10 0 0.1 1 10 100 1000 Output Current IOUT (mA) 10000 APPLICATIONS * Power source for hand-held communication equipment, cameras, and VCRs * Power source for home appliances No.EK-096-111001 * Power source for battery-powered equipment Step-down DC/DC Converter 1. 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