www.fairchildsemi.com KA378R05 Low Dropout Voltage Regulator Features Description • • • • • The KA378R05 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. Dropout voltage of KA378R05 is below 0.5V in full rated current(3A). This regulator has various function such as peak current protection, thermal shut down, overvoltage protection and output disable function. 3A / 5V Output low dropout voltage regulator TO220 Full-Mold package (4PIN) Overcurrent protection, Thermal shutdown Overvoltage protection, Short-Circuit protection With output disable function TO-220F-4L 1 1.Vin 2. Vo 3. GND 4. Vdis Internal Block Diagram Vin Q1 1 THERMAL SHUTDOWN BANDGAP REFERENCE 2 Vo OVERVOLTAGE PROTECTION + R1 SOA PROTECTION HIGH / LOW Vdis 4 + 1.4V OUTPUT ON / OFF SHORT-CIRCUIT SHORTCIRCUIT R2 PROTECTION 3 GND Rev. 1.0.2 ©2001 Fairchild Semiconductor Corporation KA378R05 Absolute Maximum Ratings Parameter Symbol Value Unit Remark Input Voltage Vin 35 V - Disable Voltage Vdis 35 V - Output Current Io 3.0 A - Power Dissipation 1 Pd1 1.5 W No Heatsink Power Dissipation 2 Pd2 15 W With Heatsink Tj 150 °C - Junction Temperature Operating Temperature Topr -20 ~ 80 °C - Thermal Resistance, Junction-to-Case(Note2) Rθjc 2.9 °C/W - Thermal Shutdown Temperature Ttsd 150 °C - Storage Temperature Tstg -65 ~ 150 °C - Electrical Characteristics (Vin=7V, Io=1.5A, Ta=25°C, unless otherwise specified) Parameter Output Voltage Symbol Conditions Min. Typ. Max. Unit Vo - 4.88 5 5.12 V - 0.1 2.0 % Load Regulation Rload Line Regulation Rline Ripple Rejection Ratio RR 5mA < Io < 3A 6V < Vin < 12V note1 0.5 2.5 % 55 - dB - - 0.5 V 2.0 - - V - - 0.8 V Dropout Voltage Vdrop Io = 3A Disable Voltage High VdisH Output Active Disable Voltage Low VdisL Output Disabled Disable Bias Current High IdisH Vdis = 2.7V - - 20 µA Disable Bias Current Low IdisL Vdis = 0.4V - - -0.4 mA Io = 0A - - 10 mA Quiescent Current Iq Note: 1.These parameters, although guaranteed, are not 100% tested in production. 2. Junction -to-case thermal resistance test enviroments. -.Pneumatic heat sink fixture. -.Clamping pressure 60psi through 12mm diameter cylinder. -.Thermal grease applied between PKG and heat sink fixture. 2 45 KA378R05 Typical Perfomance Characteristics 5 RL= 4 3 RL=1.7Ω 2 80 60 40 20 RL= 8 i Quescent current Iq(mA) 6 8 Output voltage Vo(V) 7 1 0 0 5 0 10 0 15 2 Input voltage Vin (V) 6 8 10 Figure 2. Quiescent Current vs. Input Voltage 7 5.06 6 5.04 Output voltage Vo(V) Output voltage Vo(V) Figure 1. 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) Figure 3. Output Voltage vs. Disable Voltage 8 6 4 75 25 50 TEMPERATURE Tj(oC) 100 125 Figure 4. Output Voltage vs. Temperature(Tj) Dropout voltage Vdrop(V) 10 i Quescent current Iq(mA) 4 Input voltage Vin (V) 0.6 0.5 0.4 Io=3A 0.3 2.0A 0.2 2 0.1 0 0 1.0A 0.5A -25 0 25 50 75 100 125 Junction temperature Tj (oC) Figure 5. Quiescent Current vs. Temperature(Tj) -25 0 25 50 75 100 125 Junction temperature Tj(oC) Figure 6. Dropout Voltage vs. Junction Temperature 3 KA378R05 Typical Perfomance Characteristics (Continued) 100 Relative output voltage(%) Power dissipation PD D(W) 20 15 10 5 0 -25 60 40 20 0 0 75 25 50 TEMPERATURE Tj( a oC) 100 125 Figure 7. Power Dissipation vs. Temperature(Ta) 4 80 0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 Output Current(A) Figure 8. Overcurrent Protection Characteristics (Typical Value) KA378R05 Typical Application Vo Vin 1 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 > 47µF) 5 KA378R05 Mechanical Dimensions Package Dimensions in millimeters TO-220F-4L 4.50 ±0.20 ø3.20 ±0.20 (5.00) 2.80 ±0.20 6.50 ±0.20 (1.00) (13.60) (3.30) 10.30 ±0.30 1.25MIN °) 3-1.05MIN 3-1.30MAX (45 15.70 ±0.20 (1.00) 15.60 ±0.20 3.40 ±0.10 10.00 ±0.20 1.50MAX 0.60 ±0.10 2.54TYP [2.54 ±0.25] 1.50 ±0.20 +0.10 0.50 –0.05 (1.19) 6 (7.62) (1.19) KA378R05 Ordering Information Product Number Package Operating Temperature KA378R05 TO-220F-4L -20°C to + 80°C 7 KA378R05 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. 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. www.fairchildsemi.com 11/13/01 0.0m 001 Stock#DSxxxxxxxx 2001 Fairchild Semiconductor Corporation