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.