Features

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

• 94 typical efficiency at 1 mA load (VIN=3.6 V, VOUT=3.3 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: 0.625 V to 3.3 V

• Output voltage Power Good

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

• Dynamic output voltage selection (D0, D1)

• Available in Flip-Chip 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 ST1PS01 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 two

digital control inputs, a VOUT from 0.625 V to 3.3 V can be dynamically selected.

Thanks to the enhanced PCC (peak current control) the ST1PS01 reaches very high

efficiency conversion using just a 2.2 μH inductor and two small capacitors.

Advanced design circuitry is implemented to minimize the quiescent current. The

device is available in Flip-Chip package.