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ST1S50PUR

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4 A Monolithic synchronous step-down converter with high efficiency at light load

Quantity $ per Unit Savings
1 - 9$2.550%
10 - 24$2.3010%
25 - 50$2.1815%
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Out of stock
$2.55
Parameter NameParameter Value
Input Voltage Min Volt4.0
Input Voltage Max Volt18.0
ECCN USEAR99
ECCN EUNEC
Packing TypeTape And Reel
RoHs compliantEcopack2
GradeIndustrial
Package NameDFN10 3X3

The ST1S50 device is a 500 kHz fixed frequency PWM synchronous step-down regulator. The ST1S50 operates from 4.0 V to 18 V input, while it regulates an output voltage as low as 0.8 V and up to 0.88 x VIN.


The ST1S50 device integrates a 95 mΩ high-side switch and a 69 mΩ synchronous rectifier allowing very high efficiency with very low output voltages.


The peak current mode control with a special PFM mode enables high efficiency at a light load.


The ST1S50 device is available in a VFDFPN10 3 x 3 x 1 mm - 10 leads package.

Key features
  • 4 A output current
  • 4.0 V to 18 V input voltage
  • Output voltage adjustable from 0.8 V to 0.88 x VIN
  • 500 kHz switching frequency
  • High efficiency at light load
  • Programmable soft-start and enable
  • Integrated 95 mΩ and 69 mΩ power MOSFETs
  • All ceramic capacitor
  • Power Good
  • Cycle-by-cycle current limiting
  • Short-circuit protection
  • VFDFPN10 3 x 3 x 1 mm - 10 L