ST Life.augmented


4 A, 850 kHz fixed-frequency PWM synchronous step-down demostration board based on the ST1S41 in a VFQFPN package
  • active Active

Based on the ST1S41 step-down switching regulator, the STEVAL-ISA108V1 demonstration board is an internally-compensated 850 kHz fixed-frequency PWM synchronous step-down converter.

The ST1S41 operates from 4.0 V to 18 V input, while it regulates an output voltage as low as 0.8 V and up to VIN(100% duty cycle).

The ST1S41 integrates a 95 mΩ high side switch and 69 mΩ low side synchronous rectifier, resulting in very high efficiency with very low output voltages.

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

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Data Brief

Key Features

  • 4 to 18 V input voltage
  • Output voltage adjustable from 0.8 V
  • 850 kHz switching frequency
  • Internal soft-start
  • Integrated 95 mΩ and 69 mΩ power MOSFETs
  • All ceramic capacitor
  • Enable function
  • Cycle-by-cycle current limiting
  • Current fold-back short-circuit protection
  • RoHS compliant


Design Resources


Technical Documentation

Product Specifications

Description Version Size
DB1883: 4 A, 850 kHz fixed-frequency PWM synchronous step-down demostration board based on the ST1S41 in a VFQFPN package
1.0 136 KB

Hardware Resources

Board Manufacturing Specification

Description Version Size
STEVAL-ISA108V1 gerber files
1.0 186 KB

Bill of Materials

Description Version Size
1.1 54 KB

Schematic Pack

Description Version Size
STEVAL-ISA108V1 schematics
3.0 83 KB

Sample & Buy

Part Number Marketing StatusCore ProductOrder From STUnit Price (US$)*
@ 1
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
STEVAL-ISA108V1ActiveST1S41PURBuy Direct37.97Distributor reported inventory date: 2016-02-06
Distributor NameRegionStockMin. order
Newark Element14Order NowAMERICA30
Farnell Element14Order NowEUROPE11

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors
(**) The Material Declaration forms available on may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.
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