ST Life.augmented

L7985

2A step-down switching regulator
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The L7985/A is a step-down switching 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.

The QFN and the HSOP packages with exposed pad allow the reduction of RthJAdown to 60 °C/W and 40 °C/W respectively.

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Errata Sheet
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Datasheet

Key Features

  • 2 A DC output current
  • 4.5 V to 38 V 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
  • VFQFPN 3 x 3 - 10L and HSOP8 package

Design Resources

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Technical Documentation

Product Specifications

Description Version Size
pdf
DS8733: 2 A step-down switching regulator
6.0 1,109 KB

Design Notes & Tips

Description Version Size
pdf
DN0011: ST1S03 alternative topology: Using a buck in a negative buck-boost configuration
1.0 359 KB

Related Tools and Software

Related Tools and Software

Part Number Description
STEVAL-ISA097V1 2 A step-down switching demonstration board based on the L7985 in DFN10 package
STEVAL-ISA098V1 2 A step-down switching demonstration board based on the L7985A in HSOP8 package

Publications and Collaterals

Flyer

Description Version Size
pdf
DC-DC converters
554 KB

Sample & Buy

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Part Number Marketing StatusPackagePacking TypeAutomotive GradeOrder From STUnit Price (US$)*
@ 1000
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
L7985AActivePowerSO-8Tube_-.664Distributor reported inventory date: 2014-08-28
Distributor NameRegionStockMin. order
AVNETOrder NowAMERICA19950
Farnell Element14Order NowEUROPE1051
RS COMPONENTSOrder NowEUROPE20005
RUTRONIKOrder NowEUROPE1710100
MOUSEROrder NowWORLDWIDE17301
Ecopack2-
L7985ATRActivePowerSO-8Tape And Reel_Free Samples.664Distributor reported inventory date: 2014-08-28
Distributor NameRegionStockMin. order
ARROWOrder NowAMERICA75002500
ARROWOrder NowEUROPE25000
RUTRONIKOrder NowEUROPE50002500
DIGIKEYOrder NowWORLDWIDE154681
MOUSEROrder NowWORLDWIDE21651
Ecopack2-
L7985TRActiveVDFPN 10 3x3x1.0Tape And Reel_Free Samples.63Distributor reported inventory date: 2014-08-28
Distributor NameRegionStockMin. order
DIGIKEYOrder NowWORLDWIDE35161
Ecopack2PDF
XML

(*) 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 st.com 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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