IR3823 Datasheet, PDF (3/41 Pages) International Rectifier – 3A Highly Integrated SupIRBuck Single-Input Voltage, Synchronous Buck Regulator

BLOCK DIAGRAM
IR3823
Vin
Gnd
Comp
5.1V
VCC
Internal LDO
THERMAL
SHUT DOWN
UVcc
UVcc
TSD
OC
POR
OV
FAULT
CONTROL
VREF
0.6V
+
-
0.15V
+
+ ^E/A
-
FAULT
POR VCC
Fb
Vin
Fb
INTL_SS
POR
VREF
OVER
VOLTAGE
OV
SS_Select
POR
FAULT
SOFT
START
SSOK
VREF
Enable
UVEN
SEQ
UVEN
CONTROL
LOGIC
UVcc
POR
POR
HDin
LDin
GATE
DRIVE
OC
Over Current
Protection
HDrv
LDrv
Vcc/ LDO_Out
Boot
PVin
SW
PGnd
Rt/Sync PGood
Figure 4: Simplified Block Diagram
3 www.irf.com © 2012 International Rectifier
August 1, 2013