Low Dropout Voltage Regulator
Description
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KA78R09
Low Dropout Voltage Regulator
Features
• • • • • 1A / 9V 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 KA78R09 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 KA78R09 is below 0.
5V in full rated current(1A).
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.
Vids
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.
1
©2001 Fairchild Semiconductor Corporation
KA78R09
Absolute Maximum Ratings
Parameter Input Voltage Disable Voltage Output Current Power Dissipation 1 Power Dissipation 2 Junction Temperature Operating Temperature Symbol Vin Vdis Io Pd1 Pd2 Tj Topr Value 35 35 1.
0 1.
5 15 +150 -20 ~ +80 Unit V V A W W °C °C Remark No Heatsink With Heatsink -
Electrical Characteristics
(Vin =11V, Io = 0.
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 < 1A 10V < Vin < 25V note1 Io = 1A Output Active Output Disabled Vdis = 2.
7V Vdis = 0.
4V Io = 0A Conditions Min.
8.
78 45 2.
0 Typ.
9 0.
1 0.
5 55 Max.
9.
22 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
KA78R09
Typical Perfomance Characteristics
10 8 7 6 5 ...
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