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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.
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