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.