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| 型号： | SI786LSG-E3 |
| 厂商： | Vishay Siliconix |
| 文件页数： | 7/16页 |
| 文件大小： | 236K |
| 描述： | IC REG QD BUCK/LINEAR 28SSOP |
| 标准包装： | 225 |
| 拓扑： | 降压（降压）（2），线性（LDO）（2） |
| 功能： | 任何功能 |
| 输出数： | 4 |
| 频率 - 开关： | 300kHz，200kHz |
| 电压/电流 - 输出 1： | 控制器 |
| 电压/电流 - 输出 2： | 控制器 |
| 电压/电流 - 输出 3： | 5V，5mA |
| 带 LED 驱动器： | 无 |
| 带监控器： | 无 |
| 带序列发生器： | 无 |
| 电源电压： | 5.5 V ~ 30 V |
| 工作温度： | -10°C ~ 90°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 28-SSOP |
| 包装： | 散装 |
Document Number: 70189
S-40807-Rev. J, 26-Apr-04
www.vishay.com
7
Vishay Siliconix
Si786
Product is End of Life 3/2014
PIN CONFIGURATION AND ORDERING INFORMATION
CS
3
FB
3
SS
3
SSOP-28
DH
3
ON
3
LX
3
D
1
BST
3
D
2
V
H
Q
2
DL
3
V+
V
L
T Vi w
25
26
27
28
2
3
4
1
22
23
24
5
6
7
Q
1
FB
5
GND
PGND
REF
DL
5
YNC
BST
5
HDN
ON
5
SS
5
LX
5
DH
5
CS
5
18
19
20
21
9
10
11
8
15
16
17
12
13
14
PIN DESCRIPTION
Pin Symbol
Description
1 CS
3
Current-sense input for 3.3 V Buck controller - this pins over current threshold is 100 mV with respect to FB
3
.
2 SS
3
Soft-start input for 3.3 V. Connect capacitor from SS
3
to GND.
3
ON
3
ON/OFF
logic input disables the 3.3 V Buck controller. Connect directly to V
L
for automatic turn-on.
4 D
1
Comparator #1 noninverting input, threshold = 1.650 V. Comparator #1 output = Q1. Connect to GND if unused.
5 D
2
Comparator #2 noninverting input (see D
1
).
6 V
H
External bias supply-voltage input for comparators #1 and #2.
7
Q
2
Comparator #2 output. Sources 20 礎 from V
H
when D
2
is high. Sinks 500 礎 to GND when D
2
is low regardless of V
H
input voltage.
8 Q
1
Comparator #1 output (see Q
2
).
9 GND Analog ground.
10 REF 3.3 V reference output. Supplies external loads up to 5 mA.
11 SYNC
Oscillator control/synchronization input. Connect capacitor to GND, 1 礔/mA output or 0.22 礔 minimum. For external clock
synchronization, a rising edge starts a new cycle to start. To use internal 200 kHz oscillator, connect to V
L
or GND. For
300kHz oscillator, connect to REF.
12 SHDN
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
.
13 ON
5
ON/OFF
logic input disables the 5 V Buck Controller. Connect to V
L
for automatic turn-on.
14 SS
5
Soft-start control input for 5 V Buck controller. Connect capacitor from SS
5
to GND.
15 CS
5
Current-sense input for 5 V Buck controller - this pins over current threshold is 100 mV referenced to FB
3
.
16 DH
5
Gate-drive output for the 5 V supply high-side N-Channel MOSFET.
17 LX
5
Inductor connection for the 5 V supply.
18 BST
5
Boost capacitor connection for the 5 V supply.
19 DL
5
Gate-drive output for the 5 V supply rectifying N-Channel MOSFET.
20 PGND Power Ground.
21 FB
5
Feedback input for the 5 V Buck controller.
22 V
L
5 V logic supply voltage for internal circuitry - able to source 5 mA external loads. V
L
remains on with valid voltage at V+.
23 V+ Supply voltage input.
24 DL
3
Gate-drive output for the 3.3 V supply rectifying N-Channel MOSFET.
25 BST
3
Boost capacitor connection for the 3.3 V supply.
26 LX
3
Inductor connection for the 3.3 V supply.
27 DH
3
Gate-drive output for the 3.3 V supply high-side N-Channel MOSFET.
28 FB
3
Feedback input for the 3.3 V Buck controller.
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