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| www.fairchildsemi.com KA278RA05 Low Dropout Voltage Regulator (Fixed & Adjustable) Features * * * * * * Nominal 5V output without adjusting Output Adjustable Between 1.25V and 32V 2A Output low dropout voltage regulator TO220 Full-Mold package (4PIN) Overcurrent protection, Thermal shutdown Overvoltage protection, Short-Circuit protection Description The KA278RA05 is a low-dropout voltage regulator suitable for various electronic equipments. It provides constant voltage power source with TO-220F-4 lead full mold package. Dropout voltage of KA278RA05 is below 0.5V in full rated current(2A). This regulator has various function such as peak current protection, thermal shut down and over voltage protection. TO-220F-4L 1 1. Vin 2. VO 3. GND 4. Vadj Internal Block Diagram Q1 Vin 1 2 Vo THERMAL SHUTDOWN OVERVOLTAGE PROTECTION BANDGAP REFERENCE + Rin 1.8k R1 SOA PROTECTION 4 Vadj SHORT-CIRCUIT SHORTCIRCUIT PROTECTION R2 0.6k Rref 3 GND Rev. 1.0.2 (c)2001 Fairchild Semiconductor Corporation KA278RA05 Absolute Maximum Ratings Parameter Input Voltage Output Current Power Dissipation 1 Power Dissipation 2 Junction Temperature Operating Temperature Symbol Vin IO Pd1 Pd2 Tj Topr Value 35 2.0 1.5 15 150 -20 ~ 80 Unit V A W W C C Remark No Heatsink With Heatsink - Electrical Characteristics (Vin =7V, IO =1.0A, Ta = 25 C, unless otherwise specified) Parameter Output Voltage Load Regulation Line Regulation Ripple Rejection Ratio Dropout Voltage Quiescent Current Reference Voltage Symbol Vo Rload Rline RR Vdrop Iq Vref 5mA < IO < 2A 6V < Vin < 12V note1 IO = 2A IO = 0A Conditions Min. 4.88 45 1.24 Typ. 5 0.1 0.5 55 1.27 Max. 5.12 2.0 2.5 0.5 10 1.30 Unit V % % dB V mA V Note: 1. These parameters, although guaranteed, are not 100% tested in production. 2 KA278RA05 Typical Perfomance Characteristics 7 50 Output voltage Vo(V) 6 5 RL= 8 Quiescent current Iq(mA) 40 4 3 2 1 0 0 5 30 RL=2.5 20 10 RL= 0 10 15 0 5 10 15 Input voltage Vin (V) Input voltage Vin (V) Figure 1. Output Voltage vs. Input Voltage Figure 2. Quiescent Current vs. Input Voltage 5.06 10 Output voltage Vo(V) 5.04 5.02 5.00 4.98 4.96 4.94 4.92 -25 Quiescent current Iq(mA) 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 3. Output Voltage vs. Temperature(Tj) Figure 4. Quiescent Current vs. Temperature(Tj) *Fixed Mode (VO=5V) 0.6 0.5 0.4 Io=2A 0.3 1.5A 0.2 1.0A 0.1 0.5A 0 -25 0 25 50 75 100 125 Dropout voltage Vdrop(V) 20 Power dissipation PDD(W) 15 10 5 0 -25 0 Junction temperature Tj(oC) 75 25 50 TEMPERATURE Tj(oC) a 100 125 Figure 5. Dropout Voltage vs. Junction Temperature Figure 6. Power Dissipation vs. Temperature(Ta) 3 KA278RA05 Typical Perfomance Characteristics 100 Relative output voltage(%) 80 60 40 20 0 0 1.0 2.0 3.0 4.0 5.0 6.0 Output Current(A) Figure 7. Overcurrent Protection Characteristics (Typical Value) 4 KA278RA05 Typical Application Input 1 Vin Vo Output 2 KA278RA05 Ci GND Vadj R3 4 3 Co R4 RL Vo = 1.25 ( 1 + R1//R3 ) R1 = 1.8k , R2 = 0.6k R2//R4 Figure 7. Application Circuit (Adjustable Mode) * Ci is required if regulator is located an appreciable distance from power supply filter. * Co improves stability and transient response.(CO > 47F) 25 20 Variation(%) 15 10 5 0 -5 -10 -50 -25 0 25 50 75 100 125 Junction temperature Tj() Figure 8. Internal Resistor(R1,R2) Variation vs. Temperature(Tj) Input 1 Vin Vo 2 Output = 5V KA278RA05 Ci GND Vadj 4 3 Co RL Figure 9. Application Circuit (Fixed Mode) 5 KA278RA05 Mechanical Dimensions Package Dimensions in millimeters TO-220F-4L 6 KA278RA05 Ordering Information Product Number KA278RA05 Package TO-220F-4L Operating Temperature -20C to + 80C 7 KA278RA05 DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. www.fairchildsemi.com 11/16/01 0.0m 001 Stock#DSxxxxxxxx 2001 Fairchild Semiconductor Corporation 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. |
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