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4 A 850 kHz fixed-frequency PWM synchronous step-down demonstration board based on ST1S41IPHR (SO-8 ePad) with enable
  • active Active

The STEVAL-ISA107V1 is a product evaluation board to aid in testing and designing with the ST1S41 in an SO-8 ePad package. The application 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 a 69 mΩ low side synchronous rectifier allowing very high efficiency with very low output voltages. The peak current mode control with internal compensation delivers very compact solution with a minimum component count.

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Data Brief

Key Features

  • 4.0 V 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
  • Cycle by cycle current limiting
  • Current fold back short circuit protection
  • RoHS compliant


Design Resources


Technical Documentation

Product Specifications

Description Version Size
DB2051: 4 A, 850 kHz fixed-frequency PWM synchronous step-down converter based on ST1S41PHR
1.0 267 KB

Hardware Resources

Board Manufacturing Specification

Description Version Size
STEVAL-ISA107V1 gerber files
1.0 127 KB

Bill of Materials

Description Version Size
1.0 8 KB

Schematic Pack

Description Version Size
STEVAL-ISA107V1 schematics
1.0 109 KB

Sample & Buy

Part Number Marketing StatusCore ProductOrder From STUnit Price (US$)*
@ 1
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
STEVAL-ISA107V1ActiveST1S41IPHR-41Distributor reported inventory date: 2016-02-29
Distributor NameRegionStockMin. order
Farnell Element14Order NowEUROPE21

(*) 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.