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
