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www.fairchildsemi.com KA378R05 Low Dropout Voltage Regulator Features · · · · · 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 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. 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 1.4V SHORT-CIRCUIT SHORTCIRCUIT PROTECTION R2 3 GND Rev. 1.0.2 ©2001 Fairchild Semiconductor Corporation KA378R05 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 Shutdown Temperature Storage Temperature Symbol Vin Vdis Io Pd1 Pd2 Tj Topr Rjc Ttsd Tstg Value 35 35 3.0 1.5 15 150 -20 ~ 80 2.9 150 -65 ~ 150 Unit V V A W W °C °C °C/W °C °C Remark No Heatsink With Heatsink - Electrical Characteristics (Vin=7V, Io=1.5A, Ta=25°C, 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 < 3A 6V < Vin < 12V note1 Io = 3A 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 µA mA mA 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 KA378R05 Typical Perfomance Characteristics 7 i Quescent current Iq(mA) Output voltage Vo(V) 6 5 RL= 8 80 60 4 3 RL=1.7 40 2 1 0 0 5 10 15 RL= 0 0 2 4 6 8 10 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) 6 5.04 5.02 5.00 4.98 4.96 4.94 0 0.5 1 1.5 2 2.5 3 4.92 -25 0 Disable voltage Vdis (V) 75 25 50 TEMPERATURE Tj(oC) 8 20 100 125 Figure 3. Output Voltage vs. Disable Voltage Figure 4. Output Voltage vs. Temperature(Tj) i Quescent current Iq(mA) Dropout voltage Vdrop(V) 10 8 0.6 0.5 0.4 Io=3A 0.3 2.0A 0.2 0.1 0.5A 0 -25 0 25