ISL6420 Datasheet, PDF (3/19 Pages) Intersil Corporation – Advanced Single Synchronous Buck Pulse-Width Modulation (PWM) Controller

ISL6420
Functional Block Diagram
VCC5 VIN
OCSET
SGND
FB
COMP
GPIO1/REFIN
GPIO2
REFOUT
VMSET/MODE
LDO
REFERENCE
SS
0.6V
PHASE
OVERCURRENT
+ ^COMP
-
OCFLT
OVFLT
UVFLT
FAULT
LOGIC
ERROR
AMP
+
-
+
-
PWM
COMP
PWM
LOGIC
VOLTAGE
MARGINING
FB
RAMP
GENERATOR
OV/UV
VOLTAGE
MONITOR
OVFLT
UVFLT
OSC
RT
PHASE
LOGIC
EN/SS
ENSS
Typical 5V Input DC/DC Application Schematic
5V
C1
C7
R2
0.1µF
C8
C2
C3
C4
C5
VIN PVCC
VCC5
D1
OCSET ^R1
ENSS
MONITOR AND
PROTECTION
BOOT
RT
Q1
PGOOD
OSC
UGATE
C9
CDEL
REF
PHASE
SGND
--
FB
++
--
+
+
LGATE
Q2
PGND
R3
R4
COMP
C11
R6
R5 C12
VMSET/MODE
GPIO1/REFIN
GPIO2
REFOUT
C13
C6
L1
C10
BOOT
UGATE
PHASE
PVCC
LGATE
PGND
PGOOD
CDEL
3.3V
3
FN9151.4
July 18, 2005