SI9130 Datasheet, PDF (8/13 Pages) Vishay Siliconix – Pin-Programmable Dual Controller-Portable PCs

Si9130
Vishay Siliconix
Voltage Selection Table
Input
Output
3.45ADJ
OPEN
3.6ADJ
OPEN
FB₃
3.3 V
GND
OPEN
3.45 V
OPEN
GND
3.6 V
DESCRIPTION OF OPERATION
The Si9130 is a dual step-down converter, which takes a 5.5-V
to 30-V input and supplies power via two PWM controllers (see
Figure 1). These 5-V and 3.3-V supplies run on an optional
300-kHz or 200-kHz internal oscillator, or an external sync
signal. Amount of output current is limited by external
components, but can deliver greater than 6 A on either supply.
As well as these two main Buck controllers, additional loads
can be driven from two micropower linear regulators, one 5 V
(V_L) and the other 3.3 V (REF)—see Figure 2. These supplies
are each rated to deliver 5 mA. If the linear regulator circuits fall
out of regulation, both Buck controllers are shut down.
3.3-V PWM Voltage Selection
(Pins 3.45ADJ, 3.6ADJ)
The voltage at this output can be selected to 3.3 V, 3.45 V or
3.6 V, depending on the configuration of pins 3.45ADJ and
3.6ADJ. Leaving both pins open results in 3.3V nominal
output. Grounding pin 3.45ADJ while leaving 3.6ADJ open
delivers 3.45-V nominal output. Grounding 3.6 ADJ while
leaving 3.45ADJ open sets a 3.6-V nominal output.
INPUT
5.5 V to 30 V
C1
22 mF
D2A
1N4148
+3.3 V at 3 A
R1
25 mW
N1
L1
10 mH
C5
0.1 mF
C7
150 mF
D1
D1FS4
N3
C12
150 mF
(Note 1)
C9
0.01 mF
+3.3 V ON/OFF
+5 V ON/OFF
SHUTDOWN
OSC SYNC
100 W
0.1 mF
Si9130
23
V+
25 _BST3
27
DH₃
26 _LX3
V_L ²²
BST₅ ¹⁸
16
DH₅
LX₅ ¹⁷
24 _DL3
DL₅ ¹⁹
1 _CS3
28 _FB3
2 _SS3
CS₅ ¹⁵
FB₅ ²¹
SS₅ ¹⁴
3 _ON3
13
8
3.45ADJ
ON₅
12
SHDN
11
3.6ADJ
7
SYNC
9 _GND
10
20
REF PGND
Note 1: Use short, Kelvin-connected PC board
traces placed very close to one another.
C3
1 mF
D2B
1N4148
C4
0.1 mF
N2
L2
10 mH
C10
22 mF
+5 V at 5 mA
4.7 mF
R2
25 mW
+5 V at 3 A
N3
D1
D1FS4
C6
330 mF
(Note 1)
C8
0.01 mF
3.45-V Voltage Adjust
3.6-V Voltage Adjust
+3.3 V at 5 mA
www.vishay.com
8
FIGURE 1. Si9130 Application Circuit
Document Number: 70190
S-40805—Rev. F, 26-Apr-04