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KA278RXXC-Series 2 A Output Low Dropout Voltage Regulators Features Description KA278RXXC-Series (33 / 05 / 12) * 3.3 V, 5 V, 12 V Output Low-Dropout Voltage Regulator * TO-220 Full-Mold Package (4 Pin) * Over-Current Protection, Thermal Shutdown * Over-Voltage Protection, Short-Circuit Protection * Output Disable Function The KA278RXXC is a low-dropout voltage regulator suitable for various electronic equipment. It provides a constant voltage power source in a TO-220 4-lead full-mold package. The dropout voltage is below 0.5 V in full-rated current (2 A). This regulator has peak current protection, thermal shutdown, and over-voltage protection. KA278RA05C * Nominal 5 V Output without Adjusting TO-220F 4L * Output Adjustable between 1.27 V and 32 V * 2 A Output Low-Dropout Voltage Regulator * TO-220 Full-Mold Package (4 Pin) 1 * Over-Current Protection, Thermal Shutdown 1. VIN 2. VO 3. GND 4. Vdis - KA278RXXC (33 / 05 / 12) 1.VIN 2. VO 3. GND 4. Vadj - KA278RA05C * Over-Voltage Protection, Short-Circuit Protection Ordering Information Part Number Operating Temperature Range Top Mark KA278R33CTU 278R33 KA278R05CTU 278R05 KA278R12CTU -20 to 80C 278R12 KA278RA05CTU 278RA05 KA278R12CYDTU 278R12 (c) 2004 Fairchild Semiconductor Corporation KA278RXXC-Series Rev. 1.1.0 Package TO-220F 4L Packing Method Rail TO-220F 4L (Forming) www.fairchildsemi.com 1 KA278RXXC-Series -- 2 A Output Low Dropout Voltage Regulators July 2013 Vin Q1 1 2 Vin Vo OVERVOLTAGE PROTECTION THERMAL SHUTDOWN THERMAL SHUTDOWN - BANDGAP REFERENCE Q1 1 BANDGAP REFERENCE + 4 + Rin SOA PROTECTION SOA PROTECTION HIGH / LOW Vdis OVERVOLTAGE PROTECTION + R1 2 Vo OUTPUT ON / OFF 4 Vadj R2 1.4V SHORTCIRCUIT PROTECTION SHORTCIRCUIT PROTECTION Rref 3 3 GND GND Figure 1. KA278R33 / 05 / 12C Figure 2. KA278RA05C Absolute Maximum Ratings Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. Values are at TA = 25C unless otherwise noted. Symbol Parameter VIN Input Voltage Vdis Disable Voltage IO Output Current Value KA278RXXC Unit 35 V 35 V 2.0 A PD1 Power Dissipation 1 No Heat-Sink 1.5 W PD2 Power Dissipation 2 With Heat-Sink 15 W 150 C Tj Junction Temperature Topr Operating Temperature Rjc Thermal Resistance, Junction-to Case(1) Rja Thermal Resistance, Junction-to-Air -20 to 80 C 2.9 C/W 48.51 C/W Note: 1. Junction-to-case thermal resistance test environments: - Pneumatic heat sink fixture; - Clamping pressure 60 psi through 12 mm diameter cylinder; - Thermal grease applied between PKG and heat sink fixture. (c) 2004 Fairchild Semiconductor Corporation KA278RXXC-Series Rev. 1.1.0 www.fairchildsemi.com 2 KA278RXXC-Series -- 2 A Output Low Dropout Voltage Regulators Block Diagram VIN = Note 3, IO = 1.0 A, TA = 25C, unless otherwise specified. Symbol VO Parameter Output Voltage Min. Typ. Max. KA278R33C Test Conditions 3.22 3.30 3.38 KA278R05C 4.88 5.00 5.12 11.70 12.00 12.30 0.1 2.0 % 0.5 2.5 % KA278R12C Rload Rline RR Load Regulation Line Regulation 5 mA < IO < 2 A (4) (2) 45 Ripple Rejection Ratio 55 V dB Vdrop Dropout Voltage VdisH Disable Voltage High KA278RXXC Output Active VdisL Disable Voltage Low KA278RXXC Output Disabled 0.8 V IdisH Disable Bias Current High KA278RXXC Vdis = 2.7 V 20 A IdisL Disable Bias Current Low KA278RXXC Vdis = 0.4 V -0.4 mA 10 mA 1.30 V Iq Quiescent Current Vref Reference Voltage IO = 2 A Unit 0.5 2.0 V IO = 0 A KA278RA05C 1.24 V 1.27 Notes: 2. These parameters, although guaranteed, are not 100% tested in production. 3. KA278R33C: VIN = 5 V; KA278R05C: VIN = 7 V; KA278R12C: VIN = 15 V. 4. KA278R33C: VIN =4 V to 10 V; KA278R05C: VIN = 6 V to 12 V; KA278R12C: VIN = 13 V to 29 V. (c) 2004 Fairchild Semiconductor Corporation KA278RXXC-Series Rev. 1.1.0 www.fairchildsemi.com 3 KA278RXXC-Series -- 2 A Output Low Dropout Voltage Regulators Electrical Characteristics 100 Quiescent current Iq(mA) 4.50 3.75 RL= 3.00 8 Output voltage Vo(V) 5.25 2.25 RL=3.3 1.50 80 60 40 20 RL= 0.75 0 0 0 2 4 6 8 0 5 10 10 15 20 Input voltage Vin(V) Input voltage Vin (V) Figure 4. Quiescent Current vs. Input Voltage 5.25 3.36 4.50 3.34 Output voltage Vo(V) Output voltage Vo(V) Figure 3. Output Voltage vs. Input Voltage 3.75 3.00 2.25 1.50 0.75 3.32 3.30 3.28 3.26 3.24 0 0 0.5 1 1.5 2 2.5 3.22 -25 3 0 Disable voltage Vdis (V) Figure 5. Output Voltage vs. Disable Voltage 125 0.70 0.65 8 Drop out voltage Vdrop [V] Quiescent current Iq(mA) 100 Figure 6. Output Voltage vs. Temperature (Tj) 10 6 4 2 0 75 25 50 TEMPERATURE Tj(oC) -25 0 25 50 75 0.55 0.50 100 125 2.0A 0.45 0.40 0.35 0.30 -25 0 25 50 75 100 125 Junction Temp Tj [] Junction temperature Tj(oC) Figure 8. Dropout Voltage vs. Junction Temperature Figure 7. Quiescent Current vs. Temperature (Tj) (c) 2004 Fairchild Semiconductor Corporation KA278RXXC-Series Rev. 1.1.0 0.60 www.fairchildsemi.com 4 KA278RXXC-Series -- 2 A Output Low Dropout Voltage Regulators Typical Performance Characteristics (KA278R33C) (Continued) 100 Relative output voltage(%) Power dissipation PD(W) 20 15 10 5 0 -25 80 60 40 20 0 0 75 25 50 TEMPERATURE Tj(oC) 100 0 125 1.0 2.0 3.0 4.0 5.0 6.0 Output Current(A) Figure 10. Over-Current Protection Characteristics (Typical Value) Figure 9. Power Dissipation vs. Temperature (Tj) Output peak current Iop (A) 4.75 4.50 4.25 4.00 3.75 3.50 0 1 2 3 4 5 6 Input-output differential voltage Vin-Vo (V) Figure 11. Output Peak Current vs. Input-Output Differential Voltage (c) 2004 Fairchild Semiconductor Corporation KA278RXXC-Series Rev. 1.1.0 www.fairchildsemi.com 5 KA278RXXC-Series -- 2 A Output Low Dropout Voltage Regulators Typical Performance Characteristics (KA278R05C) 120 6 Quiescent current Iq(mA) 100 5 RL= 8 Output voltage Vo(V) 7 4 RL=2.5 3 2 80 60 40 20 RL= 1 0 0 5 0 10 0 5 10 15 20 Input voltage Vin(V) 15 Input voltage Vin (V) Figure 13. Quiescent Current vs. Input Voltage 7 5.06 6 5.04 Output voltage Vo(V) Output voltage Vo(V) Figure 12. Output Voltage vs. Input Voltage 5 4 3 2 1 5.02 5.00 4.98 4.96 4.94 0 0 0.5 1 1.5 2 2.5 4.92 -25 3 0 Disable voltage Vdis (V) 100 125 Figure 15. Output Voltage vs. Temperature (Tj) 0.70 8 0.65 Drop out voltage Vdrop [V] Quiescent current Iq(mA) Figure 14. Output Voltage vs. Disable Voltage 75 25 50 TEMPERATURE Tj(oC) 6 4 2 0 0.60 0.55 0.50 0.40 0.35 0.30 -25 -25 0 25 50 75 100 125 2.0A 0.45 0 25 50 75 100 125 Junction Temp Tj [] Junction temperature Tj(oC) Figure 17. Dropout Voltage vs. Junction Temperature figure 16. Quiescent Current vs. Temperature (Tj) (c) 2004 Fairchild Semiconductor Corporation KA278RXXC-Series Rev. 1.1.0 www.fairchildsemi.com 6 KA278RXXC-Series -- 2 A Output Low Dropout Voltage Regulators Typical Performance Characteristics (Continued) Relative output voltage(%) Power dissipation PD(W) 20 15 10 5 0 -25 80 60 40 20 0 0 75 25 50 TEMPERATURE Tj(oC) 100 0 125 1.0 2.0 3.0 4.0 5.0 6.0 Output Current(A) Figure 19. Over-Current Protection Characteristics (Typical Value) Figure 18. Power Dissipation vs. Temperature (Tj) Output peak current Iop (A) 4.75 4.50 4.25 4.00 3.75 3.50 0 1 2 3 4 5 6 Input-output differential voltage Vin-Vo (V) Figure 20. Output Peak Current vs. Input-Output Differential Voltage (c) 2004 Fairchild Semiconductor Corporation KA278RXXC-Series Rev. 1.1.0 www.fairchildsemi.com 7 KA278RXXC-Series -- 2 A Output Low Dropout Voltage Regulators Typical Performance Characteristics 120 15.0 100 RL= Quiescent current Iq(mA) 12.5 8 Output voltage Vo(V) (KA278R12C) 10.0 RL= 6 7.5 5.0 80 60 40 20 RL= 2.5 0 0 5 0 10 15 20 0 5 25 10 15 20 Input voltage Vin(V) Input voltage Vin (V) Figure 22. Quiescent Current vs. Input Voltage 15.0 Output voltage Vo(V) Output voltage Vo(V) Figure 21. Output Voltage vs. Input Voltage 12.5 10.0 7.5 5.0 12.04 12.02 12.00 11.98 11.96 2.5 11.94 0 0 0.5 1 1.5 2 2.5 11.92 -25 3 0 Disable voltage Vdis (V) Figure 23. Output Voltage vs. Disable Voltage 125 0.70 0.65 8 Drop out voltage Vdrop [V] Quiescent current Iq(mA) 100 Figure 24. Output Voltage vs. Temperature (Tj) 10 6 4 2 0 75 25 50 TEMPERATURE Tj(oC) -25 0 25 50 75 100 0.55 0.50 125 2.0A 0.45 0.40 0.35 0.30 -25 0 25 50 75 100 125 Junction Temp Tj [] Junction temperature Tj(oC) Figure 26. Dropout Voltage vs. Junction Temperature 25. Quiescent Current vs. Temperature (Tj) (c) 2004 Fairchild Semiconductor Corporation KA278RXXC-Series Rev. 1.1.0 0.60 www.fairchildsemi.com 8 KA278RXXC-Series -- 2 A Output Low Dropout Voltage Regulators Typical Performance Characteristics (Continued) 100 Relative output voltage(%) Power dissipation PD(W) 20 15 10 5 0 -25 80 60 40 20 0 0 75 25 50 TEMPERATURE Tj(oC) 100 0 125 1.0 2.0 3.0 4.0 5.0 6.0 Output Current(A) Figure 28. Over-Current Protection Characteristics (Typical Value) Figure 27. Power Dissipation vs. Temperature (Tj) Output peak current Iop (A) 4.75 4.50 4.25 4.00 3.75 3.50 0 1 2 3 4 5 6 Input-output differential voltage Vin-Vo (V) Figure 29. Output Peak Current vs. Input-Output Differential Voltage (c) 2004 Fairchild Semiconductor Corporation KA278RXXC-Series Rev. 1.1.0 www.fairchildsemi.com 9 KA278RXXC-Series -- 2 A Output Low Dropout Voltage Regulators Typical Performance Characteristics (KA278RA05C) 7 120 100 Quiescent current Iq(mA) Output voltage Vo(V) 6 RL= 8 5 4 RL=2.5 3 2 80 60 40 20 RL= 1 0 0 5 0 10 0 5 10 15 20 Input voltage Vin(V) 15 Input voltage Vin (V) Figure 31.Quiescent Current vs. Input Voltage Figure 30. Output Voltage vs. Input Voltage 10 Quiescent current Iq(mA) 5.06 Output voltage Vo(V) 5.04 5.02 5.00 4.98 4.96 4.94 4.92 -25 8 6 4 2 0 0 75 25 50 TEMPERATURE Tj(oC) 100 125 -25 0 25 50 75 100 125 Junction temperature Tj(oC ) Figure 33. Quiescent Current vs. Temperature (Tj) Figure 32. Output Voltage vs. Temperature (Tj) *Fixed Mode (VO = 5 V) 20 Power dissipation PD(W) 0.70 Drop out voltage Vdrop [V] 0.65 0.60 0.55 0.50 2.0A 0.45 0.40 0.35 0.30 -25 0 25 50 75 100 125 10 5 0 -25 Junction Temp Tj [] 0 75 25 50 TEMPERATURE Tj(oC) 100 125 Figure 35. Power Dissipation vs. Temperature (Tj) Figure 34. Dropout Voltage vs. Junction Temperature (c) 2004 Fairchild Semiconductor Corporation KA278RXXC-Series Rev. 1.1.0 15 www.fairchildsemi.com 10 KA278RXXC-Series -- 2 A Output Low Dropout Voltage Regulators Typical Performance Characteristics (Continued) 100 80 Output peak current Iop (A) Relative output voltage(%) 4.75 60 40 20 4.50 4.25 4.00 3.75 3.50 0 0 1.0 2.0 3.0 4.0 5.0 6.0 1 2 3 4 5 6 Input-output differential voltage Vin-Vo (V) Output Current(A) Figure 37. Output Peak Current vs. Input-Output Differential Voltage Figure 36. Over-Current Protection Characteristics (Typical Value) (c) 2004 Fairchild Semiconductor Corporation KA278RXXC-Series Rev. 1.1.0 0 www.fairchildsemi.com 11 KA278RXXC-Series -- 2 A Output Low Dropout Voltage Regulators Typical Performance Characteristics KA278RXXC-Series -- 2 A Output Low Dropout Voltage Regulators Typical Application KA278R33 / 05 / 12C Vo Vin 1 2 + + 3 GND 4 Vdis Disable Signal Figure 38. Application Circuit * CI is required if regulator is located at an appreciable distance from power supply filter. * CO improves stability and transient response (CO > 47 F). (c) 2004 Fairchild Semiconductor Corporation KA278RXXC-Series Rev. 1.1.0 www.fairchildsemi.com 12 KA278RXXC-Series -- 2 A Output Low Dropout Voltage Regulators Typical Application (continued) KA278RA05 Output Input Vo 1 Vin 2 KA278RA05 GND Ci Vadj 3 R3 4 Co RL R4 R1//R3 k, ,RR == 0.6 k ) R11 == 1.8 1.8k 0.6k 22 R2//R4 Vo = 1.25 1.27 ( 1 + Figure 39. Application Circuit (Adjustable Mode) * CI is required if regulator is located at an appreciable distance from power supply filter. * CO improves stability and transient response (CO > 47 F). 25 20 Variation(%) 15 10 5 0 -5 -10 -50 -25 0 25 50 75 100 125 Junction temperature Tj() Figure 40. Internal Resistor (R1, R2) Variation vs. Temperature (Tj) Output = 5V Input Vo 2 1 Vin KA278RA05 Ci GND 3 Vadj 4 Co RL Figure 41. Application Circuit (Fixed Mode) (c) 2004 Fairchild Semiconductor Corporation KA278RXXC-Series Rev. 1.1.0 www.fairchildsemi.com 13 KA278RXXC-Series -- 2 A Output Low Dropout Voltage Regulators Physical Dimensions TO-220F 4L 10.20 9.80 7.00 3.00 2.60 3.40 3.00 5.00 3.50 3.30 6.70 6.30 1.00X 45 (3.30 ) B 15.80 15.40 15.90 B 15.50 1.30 MAX (3X) 1.05 MIN (3X) 0.89 10.60 10.00 1 13.60 4 0.70 (4X) 0.50 1.70 B 1.30 1.25 MIN B 1.50 MAX 0.60 0.45 2.79 (4X) 2.29 NOTES: A. EXCEPT WHERE NOTED CONFORMS TO SC91A. B DOES NOT COMPLY EIAJ STD. VALUE. C. ALL DIMENSIONS ARE IN MILLIMETERS. D. DIMENSIONS ARE EXCLUSIVE OF BURRS, MOLD FLASH AND TIE BAR PROTRUSIONS. E. PIN 2 CONNECTS TO DAP. F. DRAWING FILE NAME: TO220C04REV1 4.70 4.30 Figure 42. TO220, MOLDED, 4-LEAD, FULL-PACK, STARIGHT LEAD (ACTIVE) Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision. Package specifications do not expand the terms of Fairchild's worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor's online packaging area for the most recent package drawings: http://www.fairchildsemi.com/dwg/TO/TO220C04.pdf. For current tape and reel specifications, visit Fairchild Semiconductor's online packaging area: http://www.fairchildsemi.com/packing_dwg/PKG-TO220C04.pdf. (c) 2004 Fairchild Semiconductor Corporation KA278RXXC-Series Rev. 1.1.0 www.fairchildsemi.com 14 TO-220F 4L (Forming) 10.20 9.80 3.50 3.30 3.00 2.60 3.40 3.00 7.00 5.00 6.70 6.30 15.80 15.40 15.90 B 15.50 (3.30 ) B 1.00X 45 26.80 25.20 1.30 MAX (3X) 5.60 5.00 1.05 MIN (3X) 5.30 B 4.70 0.70 0.50 0.89 1 1.25 MIN B 1.50 MAX B 1.70 B 1.30 4 2.79 2.29 3.48 B 2.88 0.60 0.45 NOTES: A. EXCEPT WHERE NOTED CONFORMS TO SC91A. B DOES NOT COMPLY EIAJ STD. VALUE. C. ALL DIMENSIONS ARE IN MILLIMETERS. D. DIMENSIONS ARE EXCLUSIVE OF BURRS, MOLD FLASH AND TIE BAR PROTRUSIONS. E. PIN 2 CONNECTS TO DAP. F. DRAWING FILE NAME: TO220B04REV1 4.70 4.30 Figure 43. TO220, MOLDED, 4-LEAD, FULL-PACK, YDTU FORMING (ACTIVE) Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision. Package specifications do not expand the terms of Fairchild's worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor's online packaging area for the most recent package drawings: http://www.fairchildsemi.com/dwg/TO/TO220B04.pdf. For current tape and reel specifications, visit Fairchild Semiconductor's online packaging area: http://www.fairchildsemi.com/packing_dwg/PKG-TO220B04.pdf. (c) 2004 Fairchild Semiconductor Corporation KA278RXXC-Series Rev. 1.1.0 www.fairchildsemi.com 15 KA278RXXC-Series -- 2 A Output Low Dropout Voltage Regulators Physical Dimensions (continued) TRADEMARKS The following includes registered and unregistered trademarks and service marks, owned by Fairchild Semiconductor and/or its global subsidiaries, and is not intended to be an exhaustive list of all such trademarks. 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