SC1534 查看數據表（PDF） - Semtech Corporation
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SC1534 Datasheet PDF : 7 Pages
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400mA SmartLDOTM
SC1534
PRELIMINARY - July 26, 2000
PIN DESCRIPTION
Pin Name
DR
GND
VAUX
VIN
VO
SO-8 Pin #
4
5,6,7,8
1
2
3
TO-263-5L Pin # Pin Function
5
Driver output for external P-channel MOSFET pass element.
3/TAB
Logic and power ground.
1
This is the auxiliary input supply, nominally 3.3V.
2
This is the main input supply for the IC, nominally 5V.
4
LDO 3.3V output.
APPLICATION CIRCUIT
Q1
3.3VAUX
5V
C1
0.1uF
C2
4.7uF
C3
0.1uF
U1 SC1534CS
1
2
VAUX GND
8
7
3
4
VIN
VO
DR
GND
GND
GND
6
5
3.3V OUT
C4
10uF
C5
0.1uF
Q1
5V
3.3VAUX
C1
0.1uF
C2
4.7uF
C3
0.1uF
U1
SC1534CM
2 VIN TAB DR 5
1 VAUX GND VO 4
3
C4
10uF
3.3V OUT
C5
0.1uF
NOTE:
(1) External switch (Q1): use a low threshold P-channel MOSFET such as Fairchild FDN338P or International
Rectifier IRF7604, or equivalent. (PMOS, typical gate threshold voltage ~ 1V, RDS(ON) < 200mΩ at VGS = 2.7V).
© 2000 SEMTECH CORP.
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