Datasheet

© 2008 Microchip Technology Inc. DS21949C-page 3
TC1303A/TC1303B/TC1303C/TC1304
Functional Block Diagram – TC1303
Synchronous Buck Regulator
NDRV
PDRV
P
GND
V
IN1
L
X
Driver
P
GND
Control
V
OUT1
/V
FB1
V
IN2
SHDN1
PG
V
REF
LDO
V
OUT2
A
GND
A
GND
P
GND
Undervoltage Lockout
UVLO
UVLO
SHDN2
V
REF
TC1303A
(1)
,B
(2)
,C
(1)
options
PG Generator with Delay
(UVLO)
Sense LDO for B,C
Sense Switcher for A,C
Note 1: PG open-drain for A,C options
2: PG push-pull output for B option