General Description
The AP2203 is a 150mA ULDO regulator, which provides ultra low dropout voltage (typically 165mV at 150mA), very low quiescent current (1μA maximum) in shutdown mode and excellent power supply ripple rejection (PSRR 75dB at 100Hz) in battery powered applications, such as handsets and PDAs and in noise sensitive applications, such as RF electronics.
The AP2203 also features an undervoltage monitor with an error flag output, logic compatible enable/shutdown control inputs, a low power shutdown mode for extended battery life, over current protection, over temperature protection as well as reversed-battery protection.
The AP2203 has 2.5V, 3.0V and 3.3V versions.
The AP2203 is available in space saving 5-pin SOT-23-5 package.

Features
· Error Flag to Indicate Undervoltage Fault
· Up to 150mA Regulator Output
· Low Quiescent Current
· Low Dropout Voltage: VDROP=165mV at 150mA
· High Output Accuracy: ±1%
· Good Ripple Rejection Ability: 75dB at 100Hzand IOUT=100μA
· Tight Load and Line Regulation
· Low Temperature Coefficient
· Over Current Protection
· Thermal Protection
· Reverse-battery Protection
· Zero Off-mode Current
· Logic-controlled Enable

Applications
· Cellular Phones
· Cordless Phones
· Wireless Communicators
· PDAs / Palmtops
· Consumer Electronics

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