isl9440b Intersil Corporation, isl9440b Datasheet - Page 3

• Manufacturer Part Number: isl9440b
• Description: Triple Step-down Pwm And Single Linear Controller With Programmable Soft-start
• Manufacturer: Intersil Corporation

Block Diagram
OCSET1
EN/SS1
ISEN1
G4
FB1
BOOT1
UGATE1
PHASE1
LGATE1
LDOFB
VCC_5V
+ 0.8V
1.3V REF
REF
CURRENT
SAMPLE
180kΩ
PGND
+
1.75V REFERENCE
g
1400kΩ
m
_
+
*V
ADAPTIVE DEAD-TIME
E
1.55uA
V/I SAMPLE TIMING
-
+
CHANNEL 1
V
18.5pF
ERROR AMP 1
+
-
E
CURRENT
0.8V REFERENCE
VCC_5V
SAMPLE
EN/SS1
16kΩ
+
-
+
-
+
PGOOD
PWM1
OVERCURRENT FAULT
RST
OC1
REQUIRED TO LATCH
SAME STATE FOR
2 CLOCK CYCLES
OC1
VCC_5V
PWM CHANNEL PHASE CONTROL
DUTY CYCLE RAMP GENERATOR
EARLY WARNING
OCP
BIAS SUPPLIES
OC2
FAULT LATCH
REFERENCE
SOFT-START
(see note 7)
ENABLE
OC3
POR
VIN PGND
VIN
FB1
UV/OV
SGND
FB2
PGOOD
FB3
VCC_5V
FB4
EN/SS1
EN/SS2
EN/SS3
UV
VIN
PWM2
PWM3
OC3
OC2
ADAPTIVE DEAD-TIME
ADAPTIVE DEAD-TIME
VCC_5V
VCC_5V
V/I SAMPLE TIMING
V/I SAMPLE TIMING
CHANNEL 3
CHANNEL 2
PGND
PGND
VCC_5V
VCC_5V
UGATE2
PHASE2
UGATE3
PHASE3
LGATE2
LGATE3
EN/SS3
OCSET3
OCSET2
EN/SS2
BOOT2
BOOT3
ISEN3
ISEN2
FB3
FB2