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ST1PS03A1QTR

ST1PS03A1QTR

ST1PS03AQTR

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400 mA nano-quiescent synchronous step-down converter with digital voltage selection, Power Good and independent Load Switch

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1 - 9$2.140%
10 - 20$1.9310%
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$2.14
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Parameter NameParameter Value
Input Voltage Min Volt1.8
Input Voltage Max Volt5.5
ECCN USEAR99
ECCN EUNEC
Packing TypeTape And Reel
RoHs compliantEcopack2
GradeIndustrial
Package NameMLPQ/QFN 1.7x2.0x0.55 12L P0.4

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.

Key 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