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參數(shù)資料
| 型號： | SI91844DT-50-T1 |
| 廠商： | Vishay Intertechnology,Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 150-mA Low-Noise LDO Regulator With Error Flag and Discharge Option |
| 中文描述： | 150 - mA的低噪音LDO調(diào)節(jié)器錯誤國旗和放電期權(quán) |
| 文件頁數(shù)： | 9/9頁 |
| 文件大小： | 90K |
| 代理商： | SI91844DT-50-T1 |
Si91842/4
Vishay Siliconix
New Product
Document Number: 71732
S-20478
—
Rev. C, 01-Apr-02
www.vishay.com
9
BLOCK DIAGRAM
Si91842/4
V
IN
Reference
–
+
Thermal
Sensor
Shutdown
Control
GND
ERROR
V
OUT
Reverse Polarity
Protection
Current
Limit
SD
Si91842
Only
DETAILED DESCRIPTION
The Si91842/4 is a low-noise, low drop-out and low quiescent
current linear voltage regulator, packaged in a small footprint
SOT23-5 package. The Si91842/4 can supply loads up to
300 mA. As shown in the block diagram, the circuit consists of
a bandgap reference, error amplifier, p-channel pass transistor
and feedback resistor string. Additional blocks, not shown in
the block diagram, include a precise current limiter, reverse
battery and current protection, and thermal sensor.
Thermal Overload Protection
The thermal overload protection limits the total power
dissipation and protects the device from being damaged.
When the junction temperature exceeds 150 , the device
turns the p-channel pass transistor off.
Reverse Battery Protection
The Si91842/4 has a battery reverse protection circuitry that
disconnects the internal circuitry when V
IN
drops below the
GND voltage. There is no current drawn in such an event.
When the SD pin is hardwired to V
IN
, the user must connect
the SD pin to V
IN
via a 100-k resistor if reverse battery
protection is desired. Hardwiring the SD pin directly to the V
IN
pin is allowed when reverse battery protection is not desired.
ERROR
ERROR is an open drain output that goes low when V
OUT
is
less than 4% of its normal value. To obtain a logic level output,
connect a pull-up resister from ERROR to V
OUT
or any other
voltage equal to or less than V
IN
. ERROR pin is high
impedance (off) when SD pin is low.
Auto-Discharge/No-Discharge
V
OUT
has an internal 100- (typ.) discharge path to ground
when SD pin is low for the Si91842. the Si91844 does not have
a discharge path when the SD pin is low.
Stability
The circuit is stable with only a small output capacitor equal to
6 nF/mA (= 1 F @ 150 mA). Since the bandwidth of the error
amplifier is around 1
–
3 MHz and the dominant pole is at the
output node, the capacitor should be capacitive in this range,
i.e., for 150-mA load current, an ESR <0.4 is necessary.
Parasitic inductance of about 10 nH can be tolerated.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SI91845 | 制造商:VISHAY 制造商全稱:Vishay Siliconix 功能描述:150-mA Ultra Low-Noise LDO Regulator With Error Flag and Discharge Option |
| SI91845DT-18-T1 | 制造商:Vishay Siliconix 功能描述:REG LDO LIN FIX POS 1.8V 0.3A 6PIN SOT-23 - Tape and Reel |
| SI91845DT-20-T1 | 制造商:Vishay Siliconix 功能描述:REG LDO LIN FIX POS 2V 0.3A 6PIN SOT-23 - Tape and Reel |
| SI91845DT-22-T1 | 制造商:Vishay Siliconix 功能描述:REG LDO LIN FIX POS 2.2V 0.3A 6PIN SOT-23 - Tape and Reel |
| SI91845DT-25-T1 | 制造商:Vishay Siliconix 功能描述:REG LDO LIN FIX POS 2.5V 0.3A 6PIN SOT-23 - Tape and Reel |
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