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