FTM Board Club

400mA Nano-Quiescent Synchronous step-down converter with digital voltage selection and power good

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 1.8 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 H inductor and two small capacitors. Advanced design circuitry is implemented to minimize the quiescent current. The device is available in Flip-Chip package.

  • 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 H typ.
  • Selectable output voltages: 1.8 V to 3.3 V
  • Output voltage Power Good
  • 1.5% output voltage accuracy (VOUT, TA=25 C)
  • Dynamic voltage selection (D0, D1)
  • Available in Flip-Chip package