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 DFN 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
    • VFDFPN 3x3 - 10L and HSOP8 package

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Part Number
Package
Packing Type
Marketing Status
Budgetary Price (US$)*
Quantity
ECCN (US)
Country of Origin
Order from Distributors
Order from ST
L7985A PowerSO-8 Tube
Active
0.791 1000 EAR99 CHINA Check Availability

Distributor availability ofL7985A

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 938 1 Order Now
RS COMPONENTS EUROPE 3060 5 Order Now
ARROW EUROPE 2605 0 Order Now
ARROW AMERICA 1 2000 Order Now
MOUSER WORLDWIDE 612 1 Order Now
RUTRONIK EUROPE 1800 100 Order Now

Distributor reported inventory date: 2019-05-20

Distributor Name

DIGIKEY

Stock

938

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

3060

Min.Order

5

Region

EUROPE Order Now

ARROW

Stock

2605

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

1

Min.Order

2000

Region

AMERICA Order Now

MOUSER

Stock

612

Min.Order

1

Region

WORLDWIDE Order Now

RUTRONIK

Stock

1800

Min.Order

100

Region

EUROPE Order Now

Distributor reported inventory date: 2019-05-20

Buy direct
L7985ATR PowerSO-8 Tape And Reel
Active
0.791 1000 EAR99 CHINA Check Availability

Distributor availability ofL7985ATR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 11489 1 Order Now
ARROW AMERICA 3 1 Order Now
MOUSER WORLDWIDE 5537 1 Order Now

Distributor reported inventory date: 2019-05-20

Distributor Name

DIGIKEY

Stock

11489

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

3

Min.Order

1

Region

AMERICA Order Now

MOUSER

Stock

5537

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-05-20

Get sample
L7985TR DFN10 3X3 Tape And Reel
Active
0.751 1000 EAR99 PHILIPPINES Check Availability

Distributor availability ofL7985TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 3785 1 Order Now
MOUSER WORLDWIDE 3003 1 Order Now

Distributor reported inventory date: 2019-05-20

Distributor Name

DIGIKEY

Stock

3785

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

3003

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-05-20

Get sample

L7985A

Package

PowerSO-8

Packing Type

Tube

Unit Price (US$)

0.791*

Distributor availability ofL7985A

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 938 1 Order Now
RS COMPONENTS EUROPE 3060 5 Order Now
ARROW EUROPE 2605 0 Order Now
ARROW AMERICA 1 2000 Order Now
MOUSER WORLDWIDE 612 1 Order Now
RUTRONIK EUROPE 1800 100 Order Now

Distributor reported inventory date: 2019-05-20

Distributor Name

DIGIKEY

Stock

938

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

3060

Min.Order

5

Region

EUROPE Order Now

ARROW

Stock

2605

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

1

Min.Order

2000

Region

AMERICA Order Now

MOUSER

Stock

612

Min.Order

1

Region

WORLDWIDE Order Now

RUTRONIK

Stock

1800

Min.Order

100

Region

EUROPE Order Now

Distributor reported inventory date: 2019-05-20

Marketing Status

Active

Unit Price (US$)

0.791

Quantity

1000

ECCN (US)

EAR99

Country of Origin

CHINA

L7985ATR

Package

PowerSO-8

Packing Type

Tape And Reel

Unit Price (US$)

0.791*

Distributor availability ofL7985ATR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 11489 1 Order Now
ARROW AMERICA 3 1 Order Now
MOUSER WORLDWIDE 5537 1 Order Now

Distributor reported inventory date: 2019-05-20

Distributor Name

DIGIKEY

Stock

11489

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

3

Min.Order

1

Region

AMERICA Order Now

MOUSER

Stock

5537

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-05-20

Marketing Status

Active

Unit Price (US$)

0.791

Quantity

1000

ECCN (US)

EAR99

Country of Origin

CHINA

L7985TR

Package

DFN10 3X3

Packing Type

Tape And Reel

Unit Price (US$)

0.751*

Distributor availability ofL7985TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 3785 1 Order Now
MOUSER WORLDWIDE 3003 1 Order Now

Distributor reported inventory date: 2019-05-20

Distributor Name

DIGIKEY

Stock

3785

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

3003

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-05-20

Marketing Status

Active

Unit Price (US$)

0.751

Quantity

1000

ECCN (US)

EAR99

Country of Origin

PHILIPPINES

(*) 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

Evaluation Tools

    • Part Number

      2 A step-down switching demonstration board based on the L7985 in DFN10 package

      2 A step-down switching demonstration board based on the L7985A in HSOP8 package

00 Files selected for download

Technical Documentation

    • Description Version Size Action
      DS8733
      2 A step-down switching regulator
      8.0
      1.01 MB
      PDF
      DS8733

      2 A step-down switching regulator

    • Description Version Size Action
      DN0011
      ST1S03 alternative topology: Using a buck in a negative buck-boost configuration
      1.1
      359.11 KB
      PDF
      DN0011

      ST1S03 alternative topology: Using a buck in a negative buck-boost configuration

HW Model, CAD Libraries & SVD

    • Description Version Size Action
      X798X Pspice model
      2.07 MB
      ZIP

      X798X Pspice model

Publications and Collaterals

    • Description Version Size Action
      DC-DC converters
      557.92 KB
      PDF

      DC-DC converters

    • Description Version Size Action
      Brochure Power management guide 10.2018
      4.42 MB
      PDF
      Electric vehicle (EV) ecosystem 1.1
      1.28 MB
      PDF
      Switching Converters (DC-DC) – Quick Reference Guide 1.0
      481.92 KB
      PDF

      Brochure Power management guide

      Electric vehicle (EV) ecosystem

      Switching Converters (DC-DC) – Quick Reference Guide

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
L7985A
Active
PowerSO-8 Industrial Ecopack2
L7985ATR
Active
PowerSO-8 Industrial Ecopack2
L7985TR
Active
DFN10 3X3 Industrial Ecopack2

L7985A

Package:

PowerSO-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

PowerSO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

L7985ATR

Package:

PowerSO-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

PowerSO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

L7985TR

Package:

DFN10 3X3

Material Declaration**:

Marketing Status

Active

Package

DFN10 3X3

Grade

Industrial

RoHS Compliance Grade

Ecopack2

(**) 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.

eDesignSuite

Converter

Input

V This option is required. And must be less than or equal to Volt. Max [V]
V This option is required. And must be greater than or equal to Volt. Min [V]

Output Power

V This option is required and must be a number.
A This option is required and must be a number.