GENERAL DESCRIPTION
The ADP7105 is a CMOS, low dropout (LDO) linear regulator that operates from 3.3 V to 20 V and provides up to 500 mA of output current. This high input voltage LDO is ideal for regulation of high performance analog and mixed-signal circuits operating from 1.22 V to 19 V rails. Using an advanced proprietary architecture, the ADP7105 provides high power supply rejection and low noise, and achieves excellent line and load transient response with only a small 1 µF ceramic output capacitor.

FEATURES
   Input voltage range: 3.3 V to 20 V
   Maximum output current: 500 mA
   Low noise: 15 µV rms for fixed output versions
   PSRR performance of 60 dB at 10 kHz, VOUT = 3.3 V
   Reverse current protection
   Low dropout voltage: 350 mV at 500 mA
   Initial accuracy: ±0.8%
   Accuracy over line, load, and temperature
      −2% to +1%, TJ = −40°C to +125°C
      −1.25% to +1%, TJ = 0°C to +85°C
   Low quiescent current: 900 μA at VIN = 10 V, IOUT = 500 mA
   Low shutdown current: <50 µA at VIN = 12 V, stable with
      small 1 µF ceramic output capacitor
   3 fixed output voltage options: 1.8, 3.3 V and 5 V
   Adjustable output from 1.22 V to 19 V
   Programmable soft start for inrush current control
   Foldback current-limit and thermal overload protection
   User programmable precision UVLO/enable
   Power-good indicator
   8-lead LFCSP and 8-lead SOIC packages

APPLICATIONS
   Regulation of noise sensitive applications: ADC and DAC
      circuits, precision amplifiers, high frequency oscillators,
      clocks, and PLLs
   Communications and infrastructure
   Medical and healthcare
   Industrial and instrumentation