GENERAL DESCRIPTION

The ADP320 200 mA triple output LDO combines high PSRR, low noise, low quiescent current, and low dropout voltage in a voltage regulator ideally suited for wireless applications with demanding performance and board space requirements.

The low quiescent current, low dropout voltage, and wide input voltage range of the ADP320 triple LDO extend the battery life of portable devices. The ADP320 triple LDO maintains power supply rejection greater than 60 dB for frequencies as high as 100 kHz while operating with a low headroom voltage. The ADP320 triple LDO offers much lower noise performance than competing LDOs without the need for a noise bypass capacitor.

FEATURES

Bias voltage range (VBIAS): 2.5 V to 5.5 V

LDO input voltage range (VIN1/VIN2, VIN3): 1.8 V to 5.5 V

Three 200 mA low dropout voltage regulators

16-lead, 3 mm × 3 mm LFCSP

Initial accuracy: ±1

Stable with 1 µF ceramic output capacitors

No noise bypass capacitor required

3 independent logic controlled enables

Over current and thermal protection

Key specifications

High PSRR

76 dB PSRR up to 1 kHz

70 dB PSRR 10 kHz

60 dB PSRR at 100 kHz

40 dB PSRR at 1 MHz

Low output noise

24 µV rms typical output noise at VOUT = 1.2 V

43 µV rms typical output noise at VOUT = 2.8 V

Excellent transient response

Low dropout voltage: 110 mV @ 200 mA load

85 µA typical ground current at no load, all LDOs enabled

100 µs fast turn-on circuit

Guaranteed 200 mA output current per regulator

−40°C to +125°C junction temperature

APPLICATIONS

Mobile phones

Digital cameras and audio devices

Portable and battery-powered equipment

Portable medical devices

Post dc-to-dc regulation