GENERAL DESCRIPTION
The ADP151 is an ultralow noise, low dropout linear regulator that operates from 2.2 V to 5.5 V and provides up to 200 mA of output current. The low 140 mV dropout voltage at 200 mA load improves efficiency and allows operation over a wide input voltage range.

FEATURES
   Ultralow noise: 9 µV rms
   No noise bypass capacitor required
   Stable with 1 µF ceramic input and output capacitors
   Maximum output current: 200 mA
   Input voltage range: 2.2 V to 5.5 V
   Low quiescent current
      IGND = 10 µA with 0 load
      IGND = 265 μA with 200 mA load
   Low shutdown current: <1 µA
   Low dropout voltage: 140 mV at 200 mA load
   Initial accuracy: ±1%
   Accuracy over line, load, and temperature: ±2.5%
   16 fixed output voltage options: 1.1 V to 3.3 V
   PSRR performance of 70 dB at 10 kHz
   Current-limit and thermal overload protection
   Logic controlled enable
   Internal pull-down resistor on EN input
   5-lead TSOT package
   6-lead LFCSP package
   4-ball, 0.4 mm pitch WLCSP

APPLICATIONS
   RF, VCO, and PLL power supplies
   Mobile phones
   Digital camera and audio devices
   Portable and battery-powered equipment
   Post dc-to-dc regulation
   Portable medical devices