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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

Recommended for you

Related Applications

Energy generation and distribution

Home, Building and City Automation

Lighting and Controls

Smart Farming

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
      TN1224
      Mounting instructions for SMD (surface mounting device) packages
      2.2
      1.06 MB
      PDF
      TN1224

      Mounting instructions for SMD (surface mounting device) packages

    • Description Version Size Action
      DN0011
      ST1S03 alternative topology: Using a buck in a negative buck-boost configuration
      1.2
      361.3 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
      Electric vehicle (EV) ecosystem 1.1
      1.28 MB
      PDF

      Electric vehicle (EV) ecosystem

Quality and Reliability

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**:

PDF XML

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.

Sample & Buy

Part Number
Order from Distributors
Order from ST
Package
Packing Type
Marketing Status
ECCN (US)
Country of Origin
Budgetary Price (US$)*/Qty
L7985A Available at 5 distributors

Distributor availability ofL7985A

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1316 1 Order Now
RS COMPONENTS EUROPE 2550 5 Order Now
ARROW AMERICA 1 2000 Order Now
MOUSER WORLDWIDE 283 1 Order Now
Farnell Element14 EUROPE 1150 1 Order Now

Distributor reported inventory date: 2020-06-30

Distributor Name

DIGIKEY

Stock

1316

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2550

Min.Order

5

Region

EUROPE Order Now

ARROW

Stock

1

Min.Order

2000

Region

AMERICA Order Now

MOUSER

Stock

283

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1150

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-06-30

Buy now PowerSO-8 Tube
Active
EAR99 PHILIPPINES 0.791 / 1k
L7985ATR Available at 7 distributors

Distributor availability ofL7985ATR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 5856 1 Order Now
RS COMPONENTS EUROPE 1997 1 Order Now
FUTURE WORLDWIDE 2500 2500 Order Now
ARROW AMERICA 1 1 Order Now
MOUSER WORLDWIDE 2156 1 Order Now
Farnell Element14 EUROPE 1358 1 Order Now
RUTRONIK EUROPE 5000 2500 Order Now

Distributor reported inventory date: 2020-06-30

Distributor Name

DIGIKEY

Stock

5856

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

1997

Min.Order

1

Region

EUROPE Order Now

FUTURE

Stock

2500

Min.Order

2500

Region

WORLDWIDE Order Now

ARROW

Stock

1

Min.Order

1

Region

AMERICA Order Now

MOUSER

Stock

2156

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1358

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

5000

Min.Order

2500

Region

EUROPE Order Now

Distributor reported inventory date: 2020-06-30

Get sample PowerSO-8 Tape And Reel
Active
EAR99 PHILIPPINES 0.791 / 1k
L7985TR Available at 1 distributors

Distributor availability ofL7985TR

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 1965 1 Order Now

Distributor reported inventory date: 2020-06-29

Distributor Name

RS COMPONENTS

Stock

1965

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-06-29

DFN10 3X3 Tape And Reel
Active
EAR99 PHILIPPINES 0.751 / 1k

L7985A

Package

PowerSO-8

Packing Type

Tube

Budgetary Price (US$)*/Qty

0.791 / 1k

Distributor availability ofL7985A

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1316 1 Order Now
RS COMPONENTS EUROPE 2550 5 Order Now
ARROW AMERICA 1 2000 Order Now
MOUSER WORLDWIDE 283 1 Order Now
Farnell Element14 EUROPE 1150 1 Order Now

Distributor reported inventory date: 2020-06-30

Distributor Name

DIGIKEY

Stock

1316

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2550

Min.Order

5

Region

EUROPE Order Now

ARROW

Stock

1

Min.Order

2000

Region

AMERICA Order Now

MOUSER

Stock

283

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1150

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-06-30

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.791 / 1k

ECCN (US)

EAR99

Country of Origin

PHILIPPINES

L7985ATR

Package

PowerSO-8

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.791 / 1k

Distributor availability ofL7985ATR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 5856 1 Order Now
RS COMPONENTS EUROPE 1997 1 Order Now
FUTURE WORLDWIDE 2500 2500 Order Now
ARROW AMERICA 1 1 Order Now
MOUSER WORLDWIDE 2156 1 Order Now
Farnell Element14 EUROPE 1358 1 Order Now
RUTRONIK EUROPE 5000 2500 Order Now

Distributor reported inventory date: 2020-06-30

Distributor Name

DIGIKEY

Stock

5856

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

1997

Min.Order

1

Region

EUROPE Order Now

FUTURE

Stock

2500

Min.Order

2500

Region

WORLDWIDE Order Now

ARROW

Stock

1

Min.Order

1

Region

AMERICA Order Now

MOUSER

Stock

2156

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1358

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

5000

Min.Order

2500

Region

EUROPE Order Now

Distributor reported inventory date: 2020-06-30

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.791 / 1k

ECCN (US)

EAR99

Country of Origin

PHILIPPINES

L7985TR

Package

DFN10 3X3

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.751 / 1k

Distributor availability ofL7985TR

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 1965 1 Order Now

Distributor reported inventory date: 2020-06-29

Distributor Name

RS COMPONENTS

Stock

1965

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-06-29

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.751 / 1k

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