ISL6420B Intersil Corporation, ISL6420B Datasheet - Page 3

• Manufacturer Part Number: ISL6420B
• Description: Advanced Single Synchronous Buck Pulse-Width Modulation (PWM) Controller
• Manufacturer: Intersil Corporation

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Functional Block Diagram
Typical 5V Input DC/DC Application Schematic
VMSET/MODE
GPIO1/REFIN
0.1µF
C7
REFOUT
GPIO2
COMP
SGND
5V
FB
C1
R2
C8
R3
R4
PGOOD
C2
3
SGND
CDEL
ENSS
MARGINING
FB
RT
SS
VOLTAGE
VIN
R5
C11
REF
VCC5
VMSET/MODE
REFERENCE
PVCC
+
C12
-
COMP
OSC
0.6V
MONITOR AND
PROTECTION
FB
LDO
VIN
C3
R6
+
-
+
-
-
+
ERROR
AMP
VOLTAGE
MONITOR
OV/UV
VCC5
GENERATOR
ISL6420B
REFOUT
RAMP
PHASE
OCSET
+
-
C4
C13
GPIO1/REFIN
OCSET
BOOT
UGATE
PHASE
LGATE
PGND
OVFLT
UVFLT
COMP
PWM
GPIO2
OVFLT
UVFLT
OVERCURRENT
+
-
COMP
Q1
C5
R1
FAULT
LOGIC
LOGIC
OSC
PWM
OCFLT
RT
Q2
D1
C9
PHASE
LOGIC
EN/SS
ENSS
C10
L1
C6
BOOT
UGATE
PHASE
LGATE
PGOOD
PVCC
PGND
CDEL
3.3V
April 27, 2009
FN6901.0