ISL6439 Datasheet, PDF (4/15 Pages) Intersil Corporation – Single Sync Buck PWM Controller for Broadband Gateway Applications

Typical Application - 5V Input
+5V
V_IN
ISL6439, ISL6439A
DISABLE
VCC
CT1
OCSET
R_OCSET
CPVOUT
N/C CT2
ISL6439
D_BOOT
C_IN
CPGND
GND
BOOT
UGATE
C_BOOT
PHASE
ENABLE
COMP
LGATE
FB
C_BULK
C_HF
Q₁
L_OUT
C_OUT
Q₂
C_I
R_F
C_F
R_OFFSET
R_FB
V_OUT
Block Diagram
VCC
CPVOUT
CT1
CT2
CPGND
OCSET
CHARGE
PUMP
20μA
+
-
OC
COMPARATOR
POWER-ON
RESET (POR)
SOFTSTART
+
0.8V
-
ERROR
AMP
+
-
PWM
COMPARATOR
+
-
GATE
CONTROL
PWM ^LOGIC
FB
COMP
OSCILLATOR
FIXED 300kHz or 600kHz
GND
4
ENABLE
BOOT
UGATE
PHASE
LGATE
FN9057.5
November 5, 2008