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参数资料
| 型号： | SI91842DT-33-T1-E3 |
| 厂商： | VISHAY SILICONIX |
| 元件分类： | 固定正电压单路输出LDO稳压器 |
| 英文描述： | 3.3 V FIXED POSITIVE LDO REGULATOR, 0.22 V DROPOUT, PDSO5 |
| 封装： | LEAD FREE, TSOT-23, 5 PIN |
| 文件页数： | 10/10页 |
| 文件大小： | 119K |
| 代理商： | SI91842DT-33-T1-E3 |
Si91842
Vishay Siliconix
Document Number: 71732
S-50956—Rev. F, 16-May-05
www.vishay.com
9
BLOCK DIAGRAM
Si91842
VIN
Reference
+
Thermal
Sensor
Shutdown
Control
GND
ERROR
VOUT
Reverse Polarity
Protection
Current
Limit
SD
DETAILED DESCRIPTION
The Si91842 is a low-noise, low drop-out and low quiescent
current linear voltage regulator, packaged in a small footprint
Thin SOT23-5 package. The Si91842 can supply loads up to
150 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 has a battery reverse protection circuitry that
disconnects the internal circuitry when VIN drops below the
GND voltage. There is no current drawn in such an event.
When the SD pin is hardwired to VIN, the user must connect
the SD pin to VIN via a 100-kW resistor if reverse battery
protection is desired. Hardwiring the SD pin directly to the VIN
pin is allowed when reverse battery protection is not desired.
ERROR
ERROR is an open drain output that goes low when VOUT is
less than 4% of its normal value. To obtain a logic level output,
connect a pull-up resister from ERROR to VOUT or any other
voltage equal to or less than VIN. ERROR pin is high
impedance (off) when SD pin is low.
Auto-Discharge/No-Discharge
VOUT has an internal 100-W (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 mF @ 150 mA). Since the bandwidth of the error
amplifier is around 13 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 W is necessary.
Parasitic inductance of about 10 nH can be tolerated.
Vishay Siliconix maintains worldwide manufacturing capability. Products may be manufactured at one of several qualified locations. Reliability data for Silicon Technology and
Package Reliability represent a composite of all qualified locations.
For related documents such as package/tape drawings, part marking, and reliability data, see
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SI91842DT-35-T1 | 制造商:Vishay Siliconix 功能描述:REG LDO LIN FIX POS 3.5V 0.15A 5PIN SOT-23 - Tape and Reel |
| SI91842DT-36-T1 | 制造商:VISHAY 制造商全称:Vishay Siliconix 功能描述:150-mA Low-Noise LDO Regulator With Error Flag and Discharge Option |
| SI91842DT-50-T1 | 功能描述:低压差稳压器 - LDO 150mA 5.0V Error Pin w/Discharge Option RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| SI91843 | 制造商:VISHAY 制造商全称:Vishay Siliconix 功能描述:150-mA Ultra Low-Noise LDO Regulator With Discharge Option |
| SI91843DT-12-T1 | 制造商:Vishay Siliconix 功能描述:150MA EXTREMELY LOW NOISE LOW DROP OUT REGULATOR (LDO)- NO-D - Tape and Reel |
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