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2008 Microchip Technology Inc.
DS21949C-page 3
TC1303A/TC1303B/TC1303C/TC1304
Functional Block Diagram – TC1303
Synchronous Buck Regulator
NDRV
PDRV
PGND
VIN1
LX
Driver
PGND
Control
VOUT1/VFB1
VIN2
SHDN1
PG
VREF
LDO
VOUT2
AGND
PGND
Undervoltage Lockout
UVLO
SHDN2
VREF
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