Up to 2 A step down switching regulator

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  • The L5973D is a step down monolithic power switching regulator with a minimum switch current limit of 2.5 A so it is able to deliver more than 2 A DC current to the load depending on the application conditions. The output voltage can be set from 1.235 V to 35 V. The high current level is also achieved thanks to an SO8 package with exposed frame, that allows to reduce the Rth(j-amb) down to approximately 40 °C/W. The device uses an internal P-channel D-MOS transistor (with a typical Rdson of 250 mΩ) as switching element to minimize the size of the external components. An internal oscillator fixes the switching frequency at 250 kHz. Having a minimum input voltage of 4 V only, it is particularly suitable for 5 V bus, available in all computer related applications. Pulse by pulse current limit with the internal frequency modulation offers an effective constant current short circuit protection.

    Key Features

    • 2.5 A internal switch
    • Operating input voltage from 4 V to 36 V
    • 3.3 V / (±2%) reference voltage
    • Output voltage adjustable from 1.235 V to 35 V
    • Low dropout operation: 100 % duty cycle
    • 250 kHz internally fixed frequency
    • Voltage feedforward
    • Zero load current operation
    • Internal current limiting
    • Synchronization
    • Adjustable soft-start time
    • Inhibit for zero current consumption
    • Protection against feedback disconnection
    • Thermal shutdown

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Part Number
Package
Packing Type
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Quantity
ECCN (US)
Country of Origin
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L5973D PowerSO-8 Tube
Active
1.038 10000 EAR99 CHINA Check Availability

Distributor availability ofL5973D

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 13681 1 Order Now
RS COMPONENTS EUROPE 6570 5 Order Now
FUTURE WORLDWIDE 2451 1 Order Now
ARROW EUROPE 4586 0 Order Now
ARROW AMERICA 769 2000 Order Now
MOUSER WORLDWIDE 4763 1 Order Now
ANGLIA Live EUROPE 8793 1 Order Now
RUTRONIK EUROPE 1100 100 Order Now

Distributor reported inventory date: 2019-08-08

Distributor Name

DIGIKEY

Stock

13681

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

6570

Min.Order

5

Region

EUROPE Order Now

FUTURE

Stock

2451

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

4586

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

769

Min.Order

2000

Region

AMERICA Order Now

MOUSER

Stock

4763

Min.Order

1

Region

WORLDWIDE Order Now

ANGLIA Live

Stock

8793

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

1100

Min.Order

100

Region

EUROPE Order Now

Distributor reported inventory date: 2019-08-08

Buy now
L5973D013TR PowerSO-8 Tape And Reel
Active
1.038 10000 EAR99 CHINA Check Availability

Distributor availability ofL5973D013TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 6764 1 Order Now
RS COMPONENTS EUROPE 12155 5 Order Now
FUTURE WORLDWIDE 67500 2500 Order Now
ARROW EUROPE 27500 0 Order Now
MOUSER WORLDWIDE 15513 1 Order Now
Farnell Element14 EUROPE 8057 1 Order Now
RUTRONIK EUROPE 60000 2500 Order Now

Distributor reported inventory date: 2019-08-08

Distributor Name

DIGIKEY

Stock

6764

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

12155

Min.Order

5

Region

EUROPE Order Now

FUTURE

Stock

67500

Min.Order

2500

Region

WORLDWIDE Order Now

ARROW

Stock

27500

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

15513

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

8057

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

60000

Min.Order

2500

Region

EUROPE Order Now

Distributor reported inventory date: 2019-08-08

Get sample

L5973D

Package

PowerSO-8

Packing Type

Tube

Unit Price (US$)

1.038*

Distributor availability ofL5973D

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 13681 1 Order Now
RS COMPONENTS EUROPE 6570 5 Order Now
FUTURE WORLDWIDE 2451 1 Order Now
ARROW EUROPE 4586 0 Order Now
ARROW AMERICA 769 2000 Order Now
MOUSER WORLDWIDE 4763 1 Order Now
ANGLIA Live EUROPE 8793 1 Order Now
RUTRONIK EUROPE 1100 100 Order Now

Distributor reported inventory date: 2019-08-08

Distributor Name

DIGIKEY

Stock

13681

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

6570

Min.Order

5

Region

EUROPE Order Now

FUTURE

Stock

2451

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

4586

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

769

Min.Order

2000

Region

AMERICA Order Now

MOUSER

Stock

4763

Min.Order

1

Region

WORLDWIDE Order Now

ANGLIA Live

Stock

8793

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

1100

Min.Order

100

Region

EUROPE Order Now

Distributor reported inventory date: 2019-08-08

Marketing Status

Active

Unit Price (US$)

1.038

Quantity

10000

ECCN (US)

EAR99

Country of Origin

CHINA

L5973D013TR

Package

PowerSO-8

Packing Type

Tape And Reel

Unit Price (US$)

1.038*

Distributor availability ofL5973D013TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 6764 1 Order Now
RS COMPONENTS EUROPE 12155 5 Order Now
FUTURE WORLDWIDE 67500 2500 Order Now
ARROW EUROPE 27500 0 Order Now
MOUSER WORLDWIDE 15513 1 Order Now
Farnell Element14 EUROPE 8057 1 Order Now
RUTRONIK EUROPE 60000 2500 Order Now

Distributor reported inventory date: 2019-08-08

Distributor Name

DIGIKEY

Stock

6764

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

12155

Min.Order

5

Region

EUROPE Order Now

FUTURE

Stock

67500

Min.Order

2500

Region

WORLDWIDE Order Now

ARROW

Stock

27500

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

15513

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

8057

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

60000

Min.Order

2500

Region

EUROPE Order Now

Distributor reported inventory date: 2019-08-08

Marketing Status

Active

Unit Price (US$)

1.038

Quantity

10000

ECCN (US)

EAR99

Country of Origin

CHINA

(*) 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

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Evaluation Tools

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      2 A DC step-down switching regulator with 4 V/36 V input voltage range based on the L5973D

00 Files selected for download

Technical Documentation

    • Description Version Size Action
      DS2671
      2.5 A switch step down switching regulator
      16.1
      292.71 KB
      PDF
      DS2671

      2.5 A switch step down switching regulator

    • Description Version Size Action
      AN1518
      Designing with the 2.5 A DC-DC converter L5973D
      4.2
      831.97 KB
      PDF
      AN2259
      High intensity LED driver using the L5970D/L5973D
      1.6
      307.67 KB
      PDF
      AN1518

      Designing with the 2.5 A DC-DC converter L5973D

      AN2259

      High intensity LED driver using the L5970D/L5973D

    • 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
      X597X Pspice model
      3.64 MB
      ZIP

      X597X Pspice model

Publications and Collaterals

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

      Electric vehicle (EV) ecosystem

      Switching Converters (DC-DC) – Quick Reference Guide

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
L5973D
Active
PowerSO-8 Industrial Ecopack2
L5973D013TR
Active
PowerSO-8 Industrial Ecopack2

L5973D

Package:

PowerSO-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

PowerSO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

L5973D013TR

Package:

PowerSO-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

PowerSO-8

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.