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| www.fairchildsemi.com KA278R05 Low Dropout Voltage Regulator Features * * * * * 2A/5V Output Low Dropout Voltage Regulator TO-220 Full-Mold Package (4Pin) Overcurrent Protection, Thermal Shutdown Overvoltage Protection, Short Circuit Protection With Output Disable Function Description The KA278R05 is a low-dropout voltage regulator suitable for various electronic equipments. It provides constant voltage power source with TO-220 4 lead full mold package. The dropout voltage of KA278R05 is below 0.5V in full rated current(2A). This regulator has various functions such as a peak current protection, a thermal shut down, an overvoltage protection and an output disable function. TO-220F-4L 1 1.Vin 2. Vo 3. GND 4. Vdis Internal Block Diagram Q1 Vin 1 2 Vo THERMAL SHUTDOWN OVERVOLTAGE PROTECTION BANDGAP REFERENCE + R1 SOA PROTECTION HIGH / LOW Vdis 4 + OUTPUT ON / OFF R2 1.4V SHORT-CIRCUIT SHORTCIRCUIT PROTECTION 3 GND Rev. 1.0.2 (c)2002 Fairchild Semiconductor Corporation KA278R05 Absolute Maximum Ratings Parameter Input Voltage Disable Voltage Output Current Power Dissipation 1 Power Dissipation 2 Junction Temperature Operating Temperature Thermal Resistance, Junction-to Case (Note2) Thermal Resistance, Junction-to-Air (Note2) Thermal Shutdown Temperature Symbol Vin Vdis Io Pd1 Pd2 Tj Topr Rjc Rja Ttsd Value 35 35 2.0 1.5 15 150 -20 ~ 80 2.9 48.51 150 Unit V V A W W C C C/W C/W C Remark No Heatsink With Heatsink - Electrical Characteristics (Vin=7V, Io=1.0A, Ta=25C , unless otherwise specified) Parameter Output Voltage Load Regulation Line Regulation Ripple Rejection Ratio Dropout Voltage Disable Voltage High Disable Voltage Low Disable Bias Current High Disable Bias Current Low Quiescent Current Symbol Vo Rload Rline RR Vdrop VdisH VdisL IdisH IdisL Iq 5mA < Io < 2A 6V < Vin < 12V note1 Io = 2A Output Active Output Disabled Vdis = 2.7V Vdis = 0.4V Io = 0A Conditions Min. 4.88 45 2.0 Typ. 5 0.1 0.5 55 Max. 5.12 2.0 2.5 0.5 0.8 20 -0.4 10 Unit V % % dB V V V A mA mA Note: 1.These parameters, although guaranteed, are not 100% tested in production. 2. Junction -to -case thermal resistance test environments. -. Pneumatic heat sink fixture. -. Clamping pressure 60psi through 12mm diameter cylinder. -. Thermal grease applied between PKG and heat sink fixture 2 KA278R05 Typical Performance Characteristics 7 50 Output voltage Vo(V) 6 5 RL= 8 Quiescent current Iq(mA) 40 4 RL=2.5 30 3 2 1 0 0 5 10 15 20 10 RL= 0 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 7 5.06 Output voltage Vo(V) 5 4 3 2 1 0 Output voltage Vo(V) 0 0.5 1 1.5 2 2.5 3 6 5.04 5.02 5.00 4.98 4.96 4.94 4.92 -25 0 25 50 75 100 125 Disable voltage Vdis (V) Temperature Tj(C)oC) TEMPERATURE Tj( Figure 3. Output Voltage vs. Disable Voltage Figure 4. Output Voltage vs. Temperature(Tj) Quiescent current Iq(mA) 8 Dropout voltage Vdrop(V) 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 6 4 2 0 -25 0 25 50 75 100 125 75 100 125 Junction temperature Tj(oC) Junction temperature Tj(oC) Figure 5. Quiescent Current vs. Temperature(Tj) Figure 6. Dropout Voltage vs. Junction Temperature 3 KA278R05 Typical Performance Characteristics (Continued) 20 Relative output voltage(%) Power dissipation PDD(W) 80 60 15 10 40 5 20 0 -25 0 75 25 50 100 TEMPERATURE Tj(oC) Temperature Ta(C) TEMPERATURE Ta(C) 0 125 0 1.0 2.0 3.0 4.0 5.0 6.0 Output Current(A) Figure 7. Power Dissipation vs. Temperature(Ta) Figure 8. Overcurrent Protection Characteristics (Typical Value) 4 KA278R05 Typical Application Vin 1 + Vo 2 + 3 GND 4 Vdis Disable Signal Figure 1. Application Circuit * Ci is required if regulator is located an appreciable distance from power supply filter. * Co improves stability and transient response.(Co > 47F) 5 KA278R05 Mechanical Dimensions Package Dimensions in millimeters TO-220F-4L 6 KA278R05 Mechanical Dimensions (Continued) Package Dimensions in millimeters TO-220F-4L(Forming) 7 KA278R05 Ordering Information Product Number KA278R05TU KA278R05YDTU Package TO-220F-4L TO-220F-4L(Forming) Operating Temperature -20C to +80C 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 9/10/02 0.0m 001 Stock#DSxxxxxxxx 2002 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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