參數(shù)資料
型號(hào)： Si786
廠商： Vishay Intertechnology,Inc.
英文描述： Dual-Output Power-Supply Controller(用于便攜電腦電源轉(zhuǎn)換的雙輸出步降轉(zhuǎn)換器)
中文描述： 雙輸出電源控制器（用于便攜電腦電源轉(zhuǎn)換的雙輸出步降轉(zhuǎn)換器）
文件頁(yè)數(shù)： 7/13頁(yè)
文件大?。?/td> 497K
代理商： SI786
Si786
Vishay Siliconix
FaxBack 408-970-5600, request 70189
www.siliconix.com
S-60752—Rev. G, 05-Apr-99
7
PIN CONFIGURATION
ORDERING INFORMATION
Part Number
Temperature Range
V
OUT
Si786CG
0 to 70°C
3.3 V
Si786CRG
3.45 V
Si786CSG
3.6 V
Si786LG
-10° to 90°C
3.3 V
Si786LRG
3.45 V
Si786LSG
3.6 V
Demo Board
Temperature Range
Board Type
Si786DB
0 to 70°C
Surface Mount
PIN DESCRIPTION
Pin
1
2
3
4
5
6
Symbol
CS
3
SS
3
ON
3
D
1
D
2
V
H
Description
Current-sense input for 3.3-V Buck controller-this pins over current threshold is 100 mV with respect to FB
3
.
Soft-start input for 3.3 V. Connect capacitor from SS
3
to GND.
ON/OFF logic input disables the 3.3-V Buck controller. Connect directly to V
L
for automatic turn-on.
Comparator #1 noninverting input, threshold = 1.650 V. Comparator #1 output = Q1. Connect to GND if unused.
Comparator #2 noninverting input (see D
1
).
External bias supply-voltage input for comparators #1 and #2.
Comparator #2 output. Sources 20 μA from V
H
when D
2
is high. Sinks 500 μA to GND when D
2
is low
regardless of V
H
input voltage.
Comparator #1 output (see Q
2
).
Analog ground.
3.3-V reference output. Supplies external loads up to 5 mA.
Oscillator control/synchronization input. Connect capacitor to GND, 1-μF/mA output or 0.22 μF minimum. For
external clock synchronization, a rising edge starts a new cycle to start. To use internal 200-kHz oscillator,
connect to VL or GND. For 300-kHz oscillator, connect to REF.
Shutdown logic input, active low. Connect to V
L
for automatic turn-on. The 5-V V
L
supply will not be disabled in
shutdown allowing connection to SHDN.
ON/OFF logic input disables the 5-V Buck Controller. Connect to V
L
for automatic turn-on.
Soft-start control input for 5 V Buck controller. Connect capacitor from SS
5
to GND.
Current-sense input for 5 V Buck controller-this pins over current threshold is 100 mV referenced to FB
3
.
Gate-drive output for the 5-V supply high-side n-channel MOSFET.
Inductor connection for the 5-V supply.
Boost capacitor connection for the 5-V supply.
Gate-drive output for the 5-V supply rectifying n-channel MOSFET.
Power Ground.
Feedback input for the 5-V Buck controller.
5-V logic supply voltage for internal circuitry-able to source 5-mA external loads. V
L
remains on with valid
voltage at V+.
Supply voltage input.
Gate-drive output for the 3.3-V supply rectifying n-channel MOSFET.
Boost capacitor connection for the 3.3-V supply.
Inductor connection for the 3.3-V supply.
Gate-drive output for the 3.3-V supply high-side n-channel MOSFET.
Feedback input for the 3.3-V Buck controller.
7
Q
2
8
9
Q
1
GND
REF
10
11
SYNC
12
SHDN
13
14
15
16
17
18
19
20
21
ON
5
SS
5
CS
5
DH
5
LX
5
BST
5
DL
5
PGND
FB
5
22
V
L
23
24
25
26
27
28
V+
DL
3
BST
3
LX
3
DH
3
FB
3
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