2A step-down switching regulator

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.

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

Technical Documentation

Product Specifications
Description Version Size
DS8733 DS8733: 2 A step-down switching regulator 7.0 1 MB
Design Notes & Tips
Description Version Size
DN0011 DN0011: ST1S03 alternative topology: Using a buck in a negative buck-boost configuration 1.1 359 KB

HW Model & CAD Libraries

HW Model & CAD Libraries
Description Version Size
X798X Pspice model 2 MB

Publications and Collaterals

Flyers
Description Version Size
DC-DC converters 1.0 554 KB
Brochures
Description Version Size
Brochure Power management guide 05.2016 4 MB

Tools and Software

Evaluation Tools
Solution Evaluation Tools
eDesignSuite Support & Community



Sample & Buy

Part Number Package Packing Type Marketing Status Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
L7985A PowerSO-8 Tube Active - - NEC EAR99 CHINA MORE INFO DISTRIBUTOR AVAILABILITY
L7985ATR PowerSO-8 Tape And Reel Active - - NEC EAR99 CHINA MORE INFO Get Sample Add to cart DISTRIBUTOR AVAILABILITY
L7985TR VDFPN 10 3x3x1.0 Tape And Reel Active - - NEC EAR99 PHILIPPINES MORE INFO DISTRIBUTOR AVAILABILITY
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(*) 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

Quality & Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
L7985A ActivePowerSO-8IndustrialEcopack2
L7985ATR ActivePowerSO-8IndustrialEcopack2
L7985TR ActiveVDFPN 10 3x3x1.0IndustrialEcopack2 0 0
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(**) 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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