高输入电压（45V），低静止电流（2.1uA），线性调节器（LDO）MST54XXB

The MST54XXB series is a high input voltage (45V), low quiescent current (2.1uA), low-dropout linear regulator (LDO) able to provide 300mA load current. The MST54XXB family LDO offers EN pin to enable and disable the LDO output, EN pin can take 45V input  voltage.
The LDO features very fast response against line voltage transient and load current transient, and ensures no overshoot voltage during the LDO start up and short circuit recovery.
The device features integrated short-circuit and thermal shutdown protection.
The device is available with fixed output voltages of 1.8V, 3.0V, 3.3V and 5.0V, and available in SOT23 and SOT89 packages.

Application
Ø Battery-powered equipment
Ø Smoke detector and sensor
Ø Micro controller Applications
Ø Home Appliance
Features

Ø   Low Quiescent Current：2.1uA
Ø   High Input Voltage Rating：Up to 55V
Ø   High Output Current：350mA
Ø   High PSRR：85dB at 1kHZ
Ø   Low Dropout Voltage：35mV@10mA   350mV@100mA
Ø   Fixed Output Voltages：1.8V, 3.0V, 3.3V and 5.0V
Ø   High-accuracy Output Voltage: ±2%
Ø   Fast Transient Response
Ø   Integrated Short-Circuit Protection
Ø   Enable pin is available
Ø   Integrated Thermal Protection
Available Packages：

MST54XXBTE MST54XXBTE-A MST54XXBTE-B MST54XXBTE-C

SOT23-3

MST54XXBTS   MST54XXBTS-A   MST54XXBTS-B   MST54XXBTS-C

SOT89-3

MST54XXBTG

SOT23-5

芯片详细资料：https://www.dianyuan.com/upload/community/2019/12/30/1577689471-94177.pdf