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| 型号： | SI786CRG-T1-E3 |
| 厂商： | Vishay Siliconix |
| 文件页数： | 8/16页 |
| 文件大小： | 236K |
| 描述： | IC REG QD BUCK/LINEAR 28SSOP |
| 标准包装： | 1,800 |
| 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： | 0°C ~ 70°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： | 带卷 (TR) |
www.vishay.com
8
Document Number: 70189
S-40807-Rev. J, 26-Apr-04
Vishay Siliconix
Si786
Product is End of Life 3/2014
DESCRIPTION OF OPERATION
The Si786 is a dual step-down converter, which takes a 5.5V
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 sup-
ply. 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.
Two voltage comparators with adjustable output voltages are
included in the Si786. They can be used for gate drive in load
switching applications, where N-Channel MOSFETs are
used. Logic level voltages can be generated as well, for
instance to serve as P interfacing (e.g. a Power-good signal).
3.3 V Switching Supply
The 3.3 V supply is regulated by a current-mode PWM con-
troller in conjunction with several externals: two N-Channel
MOSFETs, a rectifier, an inductor and output capacitors (see
Figure 1). The gate drive supplied by DH
3
needs to be
greater than V
L
, so it is provided by the bootstrap circuit con-
sisting of a 100 nF capacitor and diode connected to BST
3
.
A low-side switching MOSFET connected to DL
3
increases
efficiency by reducing the voltage across the rectifier diode.
A low value sense resistor in series with the inductor sets the
maximum current limit, to disallow current overloads at
power-on or in short-circuit situations.
The soft-start feature on the Si786 is capacitor programma-
ble; pin SS
3
functions as a constant current source to the
external capacitor connected to GND. Excess currents at
power-on are avoided, and power-supplies can be
sequenced with different turn-on delay times by selecting the
correct capacitor value.
5 V Switching Supply
The 5 V supply is regulated by a current-mode PWM control-
ler which is nearly the same as the 3.3 V output. The dropout
voltage across the 5 V supply, as shown in the schematic in
Figure 1, is 400 mV (typ) at 2 A. If the voltage at V+ falls,
nearing 5 V, the 5 V supply will lower as well, until the V
L
lin-
ear regulator output falls below the 4 V undervoltage lockout
threshold. Below this threshold, the 5 V controller is shut off.
The frequency of both PWM controllers is set at 300 kHz
when the SYNC pin is tied to REF. Connecting SYNC to
either GND or V
L
sets the frequency at 200 kHz.
ORDERING INFORMATION
Part Number
Lead (Pb)-free
Part Number
Temp Range
V
OUT
Si786CG
C-Grade
0 to 70 癈
3.3 V
Si786CG-T1
Si786CG-T1-E3
Si786CRG
3.45 V
Si786CRG-T1
Si786CRG-T1-E3
Si786CSG
3.6 V
Si786CSG-T1
Si786CSG-T1-E3
Si786LG
L-Grade
- 10?to 90 癈
3.3 V
Si786LG-T1
Si786LG-T1-E3
Si786LRG
3.45 V
Si786LRG-T1
Si786LRG-T1-E3
Si786LSG
3.6 V
Si786LSG-T1
Si786LSG-T1-E3
Si786DG
D-Grade
- 40?to 85 癈
3.3 V
Si786DG-T1
Si786DG-T1-E3
Si786DRG
3.45 V
Si786DRG-T1
Si786DRG-T1-E3
Si786DSG
3.6 V
Si786DSG-T1
Si786DSG-T1-E3
Demo Board
Temp Range
Board Type
Si786DB
0 to 70 癈
Surface Mount
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SI786CSG | 功能描述:DC/DC 开关控制器 3.6V Power Sup Cont RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| SI786CSG-E3 | 功能描述:开关变换器、稳压器与控制器 Dual 3.6V Step-Down RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| SI786CSG-T1 | 功能描述:开关变换器、稳压器与控制器 Dual 3.6V Step-Down RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| SI786CSG-T1-E3 | 功能描述:开关变换器、稳压器与控制器 Dual 3.6V Step-Down RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| SI786DB | 功能描述:电源管理IC开发工具 SI786 Demo Board RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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