ISL85033 Intersil, ISL85033 Datasheet - Page 3

• Manufacturer Part Number: ISL85033
• Description: Wide VIN Dual Standard Buck Regulator
• Manufacturer: Intersil

Pin Descriptions
Typical Application Schematics
PIN NUMBER
22, 28
V
3A
24
25
26
27
OUT2
-
V
C
47 µ F
OUT2
13
PGOOD1, PGOOD2 Open drain power good output that is pulled to ground when the output voltage is below
7µ H
L
B340B
2
SYMBOL
SYNCIN
D
SGND
2
NC
FS
PD
VCC
VCC
VCC
68pF
C
3
FIGURE 2. DUAL 3A OUTPUT (VIN RANGE FROM 4.5V TO 28V)
25.5k
4
R
PGOOD2
PGOOD1
(Continued)
PHASE2
5
BOOT2
C
10nF
SS2
SS1
12
Connect to an external signal for synchronization from 300kHz to 2MHz (negative edge
FS
trigger). SYNCIN is not allowed to be floating.
When SYNCIN = logic 0, PHASE1 and PHASE2 are running at 180° out-of-phase.
When SYNCIN = logic 1, PHASE1 and PHASE2 are running at 0° in-phase.
When SYNCIN = an external clock, PHASE1 and PHASE2 are running at 180° out-of-phase.
Signal ground connections. The exposed pad must be connected to SGND and soldered to
the PCB. All voltage levels are measured with respect to this pin.
This is a no connection pin.
Frequency selection pin. Tie to VCC for 500kHz switching frequency. Connect a resistor to
GND for adjustable frequency from 300kHz to 2MHz.
regulation limits or during the soft-start interval. There is an internal 5MΩ internal pull-up
resistor.
The exposed pad must be connected to the system GND plane with as many vias as
possible for proper electrical and thermal performance.
27
19
3
22
28
15/16
17
20
24 23
21
C
470pF
R
69.8k
5
8
8.06k
ISL85033
ISL85033
R
ISL85033
12 26
6
10 25
8.06k
R
470pF
69.8k
2
PIN DESCRIPTION
R
C
2
4
1
11
4.7µF
13/14
2
8/9
6/7
5
VIN1
VIN2
PHASE1
BOOT1
10 µ F
42.2k
R
10nF
C
68pF
1
C
C
8
72
1
C
20 µ F
B340B
71
D
1
7µ H
www.DataSheet4U.com
L1
47 µ F
V
C
OUT1
9
V
June 24, 2010
OUT1
3A
FN6676.1