ADP121

PRODUCTION

150 mA, Low Quiescent Current, CMOS Linear Regulator in 5-Lead TSOT or 4-Ball WLCSP

Analog Devices ADP121 Product Info

10 February 2026 6

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
I_GND = 11 μA with 0 μA load
I_GND = 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 V_OUT = 1.2 V
70 dB @ 10 kHz at V_OUT = 1.2 V
Low noise: 40 μV rms at V_OUT = 1.2 V
See data sheet for additional features

Part details & applications

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 WLCSP pack-ages and utilizes the smallest footprint solution to meet a variety of portable applications.

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