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 three digital control inputs, a VOUT from 1.0 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.

• 500 nA input quiescent current at V_IN = 3.6 V (not switching)
• 92% typical efficiency at 10 mA load (V_IN = 3.6 V, V_OUT = 2.5 V)
• 100% duty cycle
• 1.8 V to 5.5 V input operating range
• Undervoltage lockout: 1.57 V (V_IN 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 (V_OUT, T_A = 25 °C)
• Dynamic output voltage selection (D0, D1 and D2)
• Auxiliary load switch Vout2 (AUX control input)
• Available in TQFN12 package