Description
The ST1PS02 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 1.8 V to 3.3 V can be dynamically selected. Thanks to the enhanced PCC (peak current control) the ST1PS02 reaches very high efficiency conversion using just a 2.2 µH inductor and two small capacitors. The device embeds a controlled load switch to supply a subsystem with same voltage rail. Advanced design circuitry is implemented to minimize the quiescent current. The device is available in thin plastic package. Product status link ST1PS02 400 mA nano-quiescent synchronous step-down converter with digital voltage selection, Power Good and AUX switch ST1PS02 Datasheet DS13206 - Rev 1 - February 2020 For further information contact your local STMicroelectronics sales office.

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.
■ Settable inductor current limitation
■ Selectable output voltages: 1.0 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)
■ Auxiliary load switch Vout2 (AUX control 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