GENERAL DESCRIPTION

The ADP121 is a quiescent current, low dropout, linear regulator that operates from 2.3 V to 5.5 V and provides up to 150 mA of output current. The low 135 mV dropout voltage at 150 mA load improves efficiency and allows operation over a wide input voltage range. The low 30 μA of quiescent current at full load makes the ADP121 ideal for battery-operated portable equipment.

The ADP121 is available in output voltages ranging from 1.2 V to 3.3 V. The parts are optimized for stable operation with small 1 μF ceramic output capacitors. The ADP121 delivers good transient performance with minimal board area.

Short-circuit protection and thermal overload protection circuits prevent damage in adverse conditions. The ADP121 is available in a tiny 5-lead TSOT and 4-ball 0.4 mm pitch halide-free WLCSP packages and utilizes the smallest footprint solution to meet a variety of portable applications.

FEATURES

Input voltage range: 2.3 V to 5.5 V

Output voltage range: 1.2 V to 3.3 V

Output current: 150 mA

Low quiescent current

IGND = 11 μA with 0 μA load

IGND = 30 μA with 150 mA load

Low shutdown current: <1 μA

Low dropout voltage

90 mV @ 150 mA load

High PSRR

70 dB @ 1 kHz at VOUT = 1.2 V

70 dB @ 10 kHz at VOUT = 1.2 V

Low noise: 40 μV rms at VOUT = 1.2 V

No noise bypass capacitor required

Output voltage accuracy: ±1

Stable with a small 1 μF ceramic output capacitor

Current limit and thermal overload protection

Logic controlled enable

5-lead TSOT package

4-ball 0.4 mm pitch WLCSP

APPLICATIONS

Mobile phones

Digital cameras and audio devices

Portable and battery-powered equipment

Post dc-to-dc regulation

Post regulation