Features

500 nA input quiescent current at VIN = 3.6 V (not switching)

92 typical efficiency at 10 mA load (VIN = 3.6 V, VOUT = 2.5 V)

100 duty cycle

1.8 V to 5.5 V input operating range

Undervoltage lockout: 1.57 V (VIN falling, typ.)

Up to 400 mA output current capability

Low power control operation for the best efficiency

Embedded soft-start circuit

Tiny external components: L = 2.2 μH typ.

Selectable output voltages: 1.6 V to 3.3 V

Output voltage Power Good

±1.5 output voltage accuracy (VOUT, TA = 25 °C)

Dynamic output voltage selection (D0, D1 and D2)

Load switch controlled by AUX input

Available in TQFN12 package

Applications

Wearable applications

Personal tracking monitors

Smart watches, sport bands

Energy harvesting, wireless sensors

Wearable and fitness accessories

Industrial sensors, portable low power devices

Single cell Li-Ion battery applications

Bluetooth® Low Energy

Zigbee

Description

The ST1PS03 is a nano-quiescent miniaturized synchronous step-down converter,

which is able to provide up to 400 mA output current with an input voltage ranging

from 1.8 V to 5.5 V. This converter is specifically designed for applications where high

efficiency, PCB size and thickness are the key factors.

The output voltage can be set using three digital control inputs, a VOUT from 1.6 V

to 3.3 V can be dynamically selected. Thanks to the enhanced PCC (peak current

control) the ST1PS03 reaches very high efficiency conversion using just a 2.2 μH

inductor and two small capacitors. An advanced design circuitry is developed to

minimize the quiescent current. The device embeds a controlled switch accessible

from VIN_AUX, to supply a subsystem. Finally, it is available in thin plastic package.