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