General Description

The MIC5239 is a low quiescent current, µCap low-dropout regulator. With a maximum operating input voltage of 30V and a quiescent current of 23µA,it is ideal for supplying keep-alive power in systems with high voltage batteries.

Capable of 500mA output, the MIC5239 has a dropout voltage of only 350mV. It can provide high output current for applications such as USB. As a µCap LDO, the MIC5239 is stable with either a

ceramic or a tantalum output capacitor. It only requires a 3.3µF output capacitor for stability.

The MIC5239 includes a logic compatible enable input and an undervoltage error flag indicator. Other features of the MIC5239 include thermal shutdown, current limit, overvolt age shutdown, reverse-leakage protection, and reverse battery protection.

Features

• Ultra-low quiescent current (IQ = 23µA @IO = 100µA)

• Continuous 500mA output current

• Wide input range: 2.3V to 30V

• Low dropout voltage: 350mV @500mA

• ±1.0 initial output accuracy

• Stable with ceramic or tantalum output capacitor

• Logic compatible enable input

• Low output voltage error flag indicator

• Overcurrent protection

• Thermal shutdown

• Reverse-leakage protection

• Reverse-battery protection

• High-power SOIC-8, MSOP-8 and SOT-223 packages

Applications

• USB power supply

• Keep-alive supply in notebook and portable personal computers

• Logic supply from high voltage batteries

• Automotive electronics

• Battery-powered systems