ST1S31D-R

ST1S31D-R

ST1S31PUR

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3 A DC step-down switching regulator

Quantity $ per Unit Savings
1 - 9$1.830%
10 - 24$1.6610%
25 - 99$1.5615%
100 - 168$1.3327%
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$1.83
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Parameter NameParameter Value
Input Voltage Min Volt2.8
Input Voltage Max Volt5.5
ECCN USEAR99
ECCN EUNEC
Packing TypeTape And Reel
RoHs compliantEcopack2
GradeIndustrial
Package NameVFDFPN 8 3x3x1.0

The ST1S31 device is an internally compensated 1.5 MHz fixed-frequency PWM synchronous step-down regulator. The ST1S31 operates from 2.8 V to 5.5 V input, while it regulates an output voltage as low as 0.8 V and up to VIN.


The ST1S31 integrates a 60 mΩ high-side switch and a 45 mΩ synchronous rectifier allowing very high efficiency with very low output voltages.


The peak current mode control with internal compensation delivers a very compact solution with a minimum component count.


The ST1S31 device is available in 3 mm x 3 mm, 8 lead VFDFPN and SO8 packages.

Key features
  • 3 A DC output current
  • 2.8 V to 5.5 V input voltage
  • Output voltage adjustable from 0.8 V
  • 1.5 MHz switching frequency
  • Internal soft-start and enable
  • Integrated 60 mΩ and 45 mΩ power MOSFETs
  • All ceramic capacitor
  • Power Good (POR)
  • Cycle-by-cycle current limiting
  • Current foldback short-circuit protection
  • VFDFPN 3 x 3 - 8L, SO8 packages