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2 A step-down switching demonstration board based on the L7985A in HSOP8 package
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The STEVAL-ISA098V1 demonstration board is a step-down switching power supply based on the L7985A in HSOP8 package.

The L7985A is a step-down regulator with a 2.5 A (minimum) current limited embedded power MOSFET, so it is able to deliver up to 2 A current to the load depending on the application conditions.

The input voltage can range from 4.5 V to 38 V, while the output voltage can be set starting from 0.6 V to VIN.

Requiring a minimum set of external components, the device includes an internal 250 kHz switching frequency oscillator that can be externally adjusted up to 1 MHz.

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Data Brief

Key Features

  • 2 A DC output current
  • From 4.5 V to 38 V range input voltage
  • Output voltage adjustable from 0.6 V
  • 250 kHz switching frequency programmable up to 1 MHz
  • Internal soft-start and enable
  • Low dropout operation: 100% duty cycle
  • Voltage feed-forward
  • Zero load current operation
  • Overcurrent and thermal protection
  • RoHS compliant


Design Resources


Technical Documentation

Product Specifications

Description Version Size
DB1621: 2 A step-down switching demonstration board based on the L7985A in HSOP8 package
1.0 286 KB

Hardware Resources

Board Manufacturing Specification

Description Version Size
STEVAL-ISA098V1 gerber files
1.0 94 KB

Bill of Materials

Description Version Size
1.0 31 KB

Schematic Pack

Description Version Size
STEVAL-ISA098V1 schematics
1.0 25 KB

License Agreement

Description Version Size
Evaluation products license agreement
1.0 126 KB

Sample & Buy

Part Number Marketing StatusCore ProductOrder From STUnit Price (US$)*
@ 1
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
STEVAL-ISA098V1ActiveL7985ABuy Direct25.72Distributor reported inventory date: 2016-02-29
Distributor NameRegionStockMin. order
Newark Element14Order NowAMERICA30
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.