November 21, 2000
GND
SHDN
PSA V E
SY NC
ENABLEIO
HIGH PERFORMANCE SYNCHRONOUS BUCK
CONTROLLER WITH LDO FOR PORTABLE
SC1401
POWER
Figure 1: SC1401 Block Diagram
V 5V
UV LO
V BG
BG
REF
OCS
COUNTER
DA C
DIG ITA L
CO NT ROLL ER
V DD1
V DD2
GATEIO
IOS
BST
DH
PHASE
DL
PGND
CS H
CSL
POWER
RESET
GOOD
BG
REF
V GB
FB
PGND
Figure 2: Main PWM Modulator Control Block
© 2000 SEMTECH CORP.
11
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