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 rangingfrom 1.8 V to 5.5 V. This converter is specifically designed for applications where highefficiency, PCB size and thickness are the key factors. The output voltage can beset using three digital control inputs, a VOUT from 1.0 V to 3.3 V can be dynamicallyselected. Thanks to the enhanced PCC (peak current control) the ST1PS02 reachesvery 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 samevoltage rail. Advanced design circuitry is implemented to minimize the quiescentcurrent. The device is available in thin plastic package.

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.

• 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