ST1PS01 Synchronous Step-Down Converter

By STMicroelectronics 367

ST1PS01 Synchronous Step-Down Converter

STMicroelectronics' ST1PS01 is a Nano-Quiescent miniaturized synchronous step-down converter 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 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 µH inductor and two small capacitors. Advanced design circuitry is implemented to minimize the quiescent current. The device is available in a flip-chip package.


  • Very high efficiency from light to full load operation
    • 95% typical efficiency at 1 mA load
    • 85% typical efficiency at 10 µA load
    • 100% duty cycle
    • 500 nA quiescent current
  • High integration for minimum board size and number of external components
    • Synchronous rectification
    • Internal loop compensation
    • Tiny external components, typical L=2.2 µH
    • Embedded soft start circuit
  • Flexibility
    • Extended input voltage range, minimum VIN=1.8 V
    • Dynamic output voltage selection