isl8120 Intersil Corporation, isl8120 Datasheet - Page 6

• Manufacturer Part Number: isl8120
• Description: Dual/n-phase Buck Pwm Controller With Integrated Drivers
• Manufacturer: Intersil Corporation

Typical Application II (Double Data Rate I or II)
(Or tie REFIN pin to VMON1 pin)
(See notes below)
R*(VDDQ/0.6-1)
Note 2: Another way to set REFIN voltage is to connect VMON1 directly to REFIN pin.
Note 1: Set the upper resistor to be a little higher than R*(VDDQ/0.6 - 1) will set the final REFIN voltage (stead state voltage after soft-start) derived from
+3.3 TO +22V
the VDDQ to be a little higher than internal 0.6V reference. In this way, the VTT final voltage will use the internal 0.6V reference after soft-start.
R
R
SET
R
FS
V
C
DDQ
F3
VIN
PGOOD
ISHARE
FSYNC
ISET
1nF
VIN
CLKOUT/REFIN
6
C
F2
ISL8120
GND
VCC
R
CC
PVCC
L
IN
VSEN1-
BOOT1
UGATE1
ISEN1A
PHASE2
ISEN2B
LGATE1
ISEN1B
COMP1
VSEN1+
BOOT2
UGATE2
LGATE2
ISEN2A
VSEN2-
PHASE1
VMON1
COMP2
VSEN2+
FB1
VMON2
FB2
C
F1
ISL8120
Z
2k
Z
COMP1
COMP1
VIN_F
Ω
2k
Ω
Z
Z
FB1
V
FB1
DDQ
C
Q1
Q2
Q3
Q4
HFIN
Or VIN_F
R
R
OS1
OS2
C
C
R
BOOT1
BOOT2
ISEN1
R
ISEN2
L
L
C
OUT1
OUT2
R
R
BIN
FB1
FB2
C
SEN2
C
SEN1
10
10
Ω
Ω
C
C
OUT1
OUT2
2.5V
1.8V
1.25V
0.9V
0.9V
V
V
V
V
10
10
SENSE1-
(DDR I)
SENSE1+
(DDR II)
SENSE2+
SENSE2-
(DDR II)
(DDR I)
Ω
Ω
March 28, 2008
( V
V
V
DDQ
TT
FN6641.0
DDQ
/2)