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參數(shù)資料
| 型號： | SI91861 |
| 廠商： | Vishay Intertechnology,Inc. |
| 英文描述： | 400-mA Smart Regulator for Network Interface Card |
| 中文描述： | 400毫安智能調(diào)節(jié)器的網(wǎng)絡接口卡 |
| 文件頁數(shù)： | 7/7頁 |
| 文件大?。?/td> | 109K |
| 代理商： | SI91861 |
Si91861
Vishay Siliconix
Document Number: 71637
S-40702—Rev. B, 19-Apr-04
www.vishay.com
7
BLOCK DIAGRAMS AND TYPICAL APPLICATION CIRCUIT
5, 6
7, 8
Si91861
3.3 V
OUT
3
5-V
Regulator
Driver
5 V
IN
Logic
Control
3.3 V
AUX
2
4
4.7
μ
F
4.7
μ
F
2.2
μ
F
DETAIL DESCRIPTION
During normal operation, the 5-V
IN
input powers the fixed
3.3-V output (3.3 V
OUT
) through an internal linear regulator. If
5 V
IN
falls below 4.07 V, the output (3.3 V
OUT
) is powered from
3.3-V
AUX
input. The power drawn sequence is from 5 V
IN
, then
3.3 V
AUX
. The device prevents reverse current from flowing
from the output to any unbiased or low voltage input.
Linear Regulator Mode
The output is regulated at 3.3 V when the 5-V
IN
pin is more
than 4.30 V. The linear regulator will regulate the output until
the 5-V
IN
pin fall below 4.07 V.
Bypass Mode
When the 5-V
IN
pin falls below 4.07 V, the output is powered
by 3.3 V
AUX
through a 0.2- internal switch.
Thermal and Over
current Protection
Thermal protection limits total power dissipation in the device.
It safeguards the device in the event of fault conditions. When
the junction temperature exceeds 165 C, the device turns off.
The device turns back on once its junction temperature cools
down by approximately 20 C. The device has overcurrent
protection (typically at 900 mA) when it operates in linear
regulator mode. A continuous short at output pin (3.3 V
OUT
)
will result in a pulsed output as the thermal protection circuitry
cycles the device on and off. For continuous operation, do not
exceed the junction rating of 150 C. In bypass mode, the
device is not current limited.
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相關代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SI91861DY | 制造商:VISHAY 制造商全稱:Vishay Siliconix 功能描述:400-mA Smart Regulator for Network Interface Card |
| SI91861DY-T1 | 功能描述:低壓差穩(wěn)壓器 - LDO 400mA 3.3V Smart LDO w/Bypass RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| SI91861DY-T1-E3 | 功能描述:低壓差穩(wěn)壓器 - LDO 400mA 3.3V Smart LDO w/Bypass RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| SI91871 | 制造商:VISHAY 制造商全稱:Vishay Siliconix 功能描述:300-mA Ultra Low-Noise LDO Regulator With Discharge Option |
| SI91871_05 | 制造商:VISHAY 制造商全稱:Vishay Siliconix 功能描述:300-mA Ultra Low-Noise LDO Regulator With Discharge Option |
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