STMicroelectronics LD3985M122R

Description
The LD3985 is a low-dropout, low-noise voltage regulator that provides up to 150 mA of current from an input voltage range of 2.5 V to 6 V. It is designed to work with low ESR ceramic capacitors and is suitable for low power applications and battery-powered systems. The LD3985 has an ultra-low dropout voltage (60 mV typ. at 150 mA load, 0.4 mV typ. at 1 mA load), a very low quiescent current (85 μA typ. at no load, 170 μA typ. at 150 mA load), and a guaranteed output current of up to 150 mA. It also has a wide range of output voltage options (1.22 V, 1.8 V, 2.5 V, 2.6 V, 2.7 V, 2.8 V, 2.9 V, 3 V, 3.3 V, and 4.7 V), a fast turn-on time (typ. 200 μs [Co 1 μF, CBYP 10 nF and lo 1 mA]), and logic-controlled electronic shutdown. The LD3985 has an internal current and thermal limit, and its output noise voltage is 30 μVRMS over 10 Hz to 100 kHz. It has a PSRR of 60 dB at 1 kHz and 50 dB at 10 kHz, and its temperature range is -40 °C to 125 °C.

Features
Input voltage from 2.5 V to 6 V
Stable with low ESR ceramic capacitors
Ultra-low dropout voltage (60 mV typ. at 150 mA load, 0.4 mV typ. at 1 mA load)
Very low quiescent current (85 μA typ. at no load, 170 μA typ. at 150 mA load; max. 1.5 μA in OFF mode)
Guaranteed output current up to 150 mA
Wide range of output voltage: 1.22 V; 1.8 V: 2.5 V; 2.6 V; 2.7 V; 2.8 V; 2.9 V; 3 V; 3.3 V; 4.7 V
Fast turn-on time: typ. 200 μs [Co 1 μF, CBYP 10 nF and lo 1 mA]
Logic-controlled electronic shutdown
Internal current and thermal limit
Output low noise voltage 30 μVRMS over 10 Hz to 100 kHz
PSRR of 60 dB at 1 kHz, 50 dB at 10 kHz
Temperature range: -40 °C to 125 °C

Applications
Mobile phones and similar battery-powered wireless systems