GENERAL DESCRIPTION

The ADP5040 combines one high performance buck regulator and two low dropout regulators (LDO) in a small 20-lead LFCSP to meet demanding performance and board space requirements.

The high switching frequency of the buck regulator enables the use of tiny multilayer external components and minimizes board space.

FEATURES

Input voltage range: 2.3 V to 5.5 V

One 1.2 A buck regulator

Two 300 mA LDOs

20-lead, 4 mm × 4 mm LFCSP package

Overcurrent and thermal protection

Soft start

Undervoltage lockout

Buck key specifications

Output voltage range: 0.8 V to 3.8 V

Current mode topology for excellent transient response

3 MHz operating frequency

Peak efficiency up to 96

Uses tiny multilayer inductors and capacitors

Mode pin selects forced PWM or auto PWM/PSM modes

100 duty cycle low dropout mode

LDOs key specifications

Output voltage range: 0.8 V to 5.2 V

Low VIN from 1.7 V to 5.5 V

Stable with 2.2 μF ceramic output capacitors

High PSRR

Low output noise

Low dropout voltage

−40°C to +125°C junction temperature range