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參數(shù)資料
| 型號(hào)： | Si91843DT-26-T1 |
| 廠商： | Vishay Intertechnology,Inc. |
| 英文描述： | 150-mA Ultra Low-Noise LDO Regulator With Discharge Option |
| 中文描述： | 150mA的超低噪聲LDO穩(wěn)壓器排放的選項(xiàng) |
| 文件頁(yè)數(shù)： | 9/9頁(yè) |
| 文件大?。?/td> | 121K |
| 代理商： | SI91843DT-26-T1 |
Si91841/3
Vishay Siliconix
Document Number: 71447
S-40592—Rev. C, 29-Mar-04
www.vishay.com
9
BLOCK DIAGRAM
Si91841/3
V
IN
Reference
+
Thermal
Sensor
Shutdown
Control
GND
V
OUT
Reverse Polarity
Protection
Current
Limit
SD
BP
Si91841
Only
DETAILED DESCRIPTION
The Si91841/3 is a low-noise, low drop-out and low quiescent
current linear voltage regulator, packaged in a small footprint
Thin SOT23-5 package. The Si91841/3 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. An external bypass
capacitor connected to the BP pin reduces noise at the output.
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 Si91841/3 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.
Noise Reduction
An external 10-nF bypass capacitor at BP is used to create a
low pass filter for noise reduction. The start-up time is fast,
since a power-on circuit pre-charges the bypass capacitor.
After the power-up sequence the pre-charge circuit is switched
to standby mode in order to save current. It is therefore not
recommended to use larger bypass capacitor values than
50 nF. When the circuit is used without a capacitor, stable
operation is guaranteed.
Auto-Discharge/No-Discharge
For Si91841 only, V
OUT
has an internal 100- (typ.) discharge
path to ground when the SD pin is low. The Si91843 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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PDF描述 |
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| Si91843DT-27-T1 | 150-mA Ultra Low-Noise LDO Regulator With Discharge Option |
| Si91846DT-18-T1 | 150-mA Ultra Low-Noise LDO Regulator With Error Flag and Discharge Option |
| Si91845DT-18-T1 | 150-mA Ultra Low-Noise LDO Regulator With Error Flag and Discharge Option |
| Si91845DT-20-T1 | 150-mA Ultra Low-Noise LDO Regulator With Error Flag and Discharge Option |
| Si91845DT-22-T1 | 150-mA Ultra Low-Noise LDO Regulator With Error Flag and Discharge Option |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| Si91843DT-27-T1 | 制造商:Vishay Siliconix 功能描述:REG LDO LIN FIX POS 2.7V 0.3A 5PIN SOT-23 - Tape and Reel |
| SI91843DT-285-T1 | 制造商:VISHAY 制造商全稱(chēng):Vishay Siliconix 功能描述:150-mA Ultra Low-Noise LDO Regulator With Discharge Option |
| Si91843DT-28-T1 | 制造商:Vishay Siliconix 功能描述:REG LDO LIN FIX POS 2.8V 0.3A 5PIN SOT-23 - Tape and Reel |
| Si91843DT-29-T1 | 制造商:Vishay Siliconix 功能描述:REG LDO LIN FIX POS 2.9V 0.3A 5PIN SOT-23 - Tape and Reel |
| SI91843DT-30-T1 | 制造商:VISHAY 制造商全稱(chēng):Vishay Siliconix 功能描述:150-mA Ultra Low-Noise LDO Regulator With Discharge Option |
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