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參數(shù)資料
| 型號(hào)： | SI786LSG-E3 |
| 廠商： | Vishay Siliconix |
| 文件頁數(shù)： | 7/16頁 |
| 文件大小： | 236K |
| 描述： | IC REG QD BUCK/LINEAR 28SSOP |
| 標(biāo)準(zhǔn)包裝： | 225 |
| 拓?fù)洌?/td> | 降壓（降壓）（2），線性（LDO）（2） |
| 功能： | 任何功能 |
| 輸出數(shù)： | 4 |
| 頻率 - 開關(guān)： | 300kHz，200kHz |
| 電壓/電流 - 輸出 1： | 控制器 |
| 電壓/電流 - 輸出 2： | 控制器 |
| 電壓/電流 - 輸出 3： | 5V，5mA |
| 帶 LED 驅(qū)動(dòng)器： | 無 |
| 帶監(jiān)控器： | 無 |
| 帶序列發(fā)生器： | 無 |
| 電源電壓： | 5.5 V ~ 30 V |
| 工作溫度： | -10°C ~ 90°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-SSOP（0.209"，5.30mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 28-SSOP |
| 包裝： | 散裝 |
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(chǔ) from V
H
when D
2
is high. Sinks 500 礎(chǔ) 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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