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4 A peak 800 kHz fixed-frequency PWM synchronous step-down demonstration board with enable on/off based on the ST1S40IPHR
  • active Active

The STEVAL-ISA082V1, based on the ST1S40IPHR, is an internally compensated 800 kHz fixed-frequency PWM synchronous step-down converter demonstration board.

The ST1S40 operates from 4.0 V to 18.0 V input, while it regulates an output voltage as low as 0.8 V and up to VIN(100% duty cycle).

The ST1S40 integrates a 95 mΩ high-side switch and a 69 mΩ synchronous rectifier allowing very high efficiency with very low output voltage.

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

The ST1S40 is protected through cycle-by-cycle current limiting in case of overload and is also protected by a current foldback function with frequency reduction in case of short-circuit.

The device is available with an enable on/off function.

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Data Brief

Key Features

  • Input voltage Vin: 4 V to 18 V
  • Output voltage Vout : 3.3 V
  • Maximum output current : 4 A
  • Switching frequency: 800 kHz
  • Short-circuit protected
  • RoHS compliant


Design Resources


Technical Documentation

Product Specifications

Description Version Size
DB1447: 3 A peak 800 kHz fixed-frequency PWM synchronous step-down evaluation board with enable on/off based on the ST1S40IPHR
2.0 231 KB

Hardware Resources

Board Manufacturing Specification

Description Version Size
STEVAL-ISA082V1 gerber files
2.1 135 KB

Bill of Materials

Description Version Size
1.0 70 KB

Schematic Pack

Description Version Size
STEVAL-ISA082V1 schematics
1.0 38 KB

Sample & Buy

Part Number Marketing StatusCore ProductOrder From STUnit Price (US$)*
@ 1
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
STEVAL-ISA082V1ActiveST1S40IPHR-47Distributor reported inventory date: 2016-02-06
Distributor NameRegionStockMin. order
Newark Element14Order NowAMERICA50
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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