Analog Devices Inc. ADP7105 LDO Regulator with Soft Start

Analog Devices Inc. ADP7105 LDO Regulator with Soft Start is a CMOS Low Dropout (LDO) Linear Regulator that that operates from 3.3V to 20V, and provides up to 500mA of output current. This high input voltage LDO is ideal for regulation of high performance analog and mixed-signal circuits operating from 1.22V to 19.0V 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 1μF ceramic output capacitor.

The ADP7105 is available in three fixed output voltage options and an adjustable version that allows output voltages ranging from 1.22V to 19.0V via an external feedback divider. The ADP7105 allows an external Soft Start capacitor to be connected to program the startup.

The ADP7105 output noise voltage is 15μV_rms and is independent of the output voltage. A digital power-good output allows power system monitors to check the health of the output voltage. A user programmable precision undervoltage lockout function facilitates sequencing of multiple power supplies.

The ADP7105 is available in 8-lead LFCSP and 8-lead SOIC packages. The 3.0mm x 3.00mm LFCSP offers a very compact solution, and provides excellent thermal performance for applications that require up to 500mA of output current in a small, low profile footprint.

Features

Input voltage range: 3.3V to 20.0V
Maximum output current: 500mA
Low noise: 15µV_rms for fixed output versions
PSRR performance of 60dB at 10kHz, V_OUT = 3.3V
Reverse current protection
Low dropout voltage: 350mV at 500mA
Initial accuracy: ±0.8%
Accuracy over line, load, and temperature: -2% to +1%
Low quiescent current: 900μA at V_IN = 10V, I_OUT= 500 mA
Low shutdown current: <50µA at V_IN = 12V, stable with small 1µF ceramic output capacitor

3 fixed output voltage options: 1.8V, 3.3V, 5.0V
Adjustable output from 1.22V to 19.0V
Programmable soft start for inrush current control
Foldback current-limit and thermal overload protection
User programmable precision UVLO/enable
Power-good indicator
Package options
- LFCSP-8 (3.0mm x 3.0mm)
- SOIC-8 (3.8mm x 4.9mm)
RoHS compliant

Applications

Regulation of noise sensitive applications, including ADC and DAC circuits, precision amplifiers, high frequency oscillators, clocks, and PLLs
Communications and infrastructure