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  • Key Features

    • Inhibit for zero current consumption (100mA at VCC= 24V)
    • Input/output synchronization function
    • Thermal shutdown
    • Protection against feedback disconnection
    • Soft start function
    • Output over voltage protection
    • Internal current limiting (pulse by pulse and HICCUP mode)
    • Zero load current operation (min 1mA)
    • Up to 3.5A step down converter
    • 3.3V and 5.1V (±1%) fixed output, and adjustable outputs from: 0.5V to 50V (3.3 type)5.1V to 50V (5.1 type)
    • Operating input voltage from 8V to 55V
    • Voltage feed forward
    • Precise 5.1V (1.5%) reference voltage externally available
    • Frequency adjustable up to 300kHz

Circuit Diagram

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Sample & Buy

Part Number
Package
Packing Type
Marketing Status
Budgetary Price (US$)*
Quantity
ECCN (US)
Country of Origin
Order from Distributors
Order from ST
L4973D3.3 SO-20 Tube
Active
1.811 10000 EAR99 MALAYSIA Check Availability

Distributor availability ofL4973D3.3

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 272 1 Order Now
ARROW EUROPE 1360 0 Order Now
MOUSER WORLDWIDE 1570 1 Order Now
Farnell Element14 EUROPE 181 1 Order Now

Distributor reported inventory date: 2019-07-22

Distributor Name

RS COMPONENTS

Stock

272

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

1360

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

1570

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

181

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-07-22

Buy now
L4973D5.1-013TR SO-20 Tape And Reel
Active
1.861 10000 EAR99 MALAYSIA Check Availability

Distributor availability ofL4973D5.1-013TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 877 1 Order Now
ARROW EUROPE 1000 0 Order Now
ARROW AMERICA 2000 1000 Order Now
MOUSER WORLDWIDE 2039 1 Order Now
ANGLIA Live EUROPE 23145 1 Order Now

Distributor reported inventory date: 2019-07-22

Distributor Name

DIGIKEY

Stock

877

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

1000

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

2000

Min.Order

1000

Region

AMERICA Order Now

MOUSER

Stock

2039

Min.Order

1

Region

WORLDWIDE Order Now

ANGLIA Live

Stock

23145

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-07-22

Buy now
L4973V3.3 PDIP 18 Tube
Active
1.693 10000 EAR99 MALAYSIA No availability of distributors reported, please contact our sales office Buy now
L4973D3.3-013TR SO-20 Tape And Reel
Active
1.811 10000 EAR99 MALAYSIA Check Availability

Distributor availability ofL4973D3.3-013TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 996 1 Order Now
FUTURE WORLDWIDE 2000 1000 Order Now
ARROW AMERICA 5000 1000 Order Now
MOUSER WORLDWIDE 479 1 Order Now

Distributor reported inventory date: 2019-07-22

Distributor Name

DIGIKEY

Stock

996

Min.Order

1

Region

WORLDWIDE Order Now

FUTURE

Stock

2000

Min.Order

1000

Region

WORLDWIDE Order Now

ARROW

Stock

5000

Min.Order

1000

Region

AMERICA Order Now

MOUSER

Stock

479

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-07-22

Buy now
L4973D5.1 SO-20 Tube
Active
1.861 10000 EAR99 MALAYSIA Check Availability

Distributor availability ofL4973D5.1

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 184 1 Order Now
ARROW EUROPE 37 0 Order Now
MOUSER WORLDWIDE 375 1 Order Now
ANGLIA Live EUROPE 307 1 Order Now

Distributor reported inventory date: 2019-07-22

Distributor Name

RS COMPONENTS

Stock

184

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

37

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

375

Min.Order

1

Region

WORLDWIDE Order Now

ANGLIA Live

Stock

307

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-07-22

Buy now
L4973V5.1 PDIP 18 Tube
Active
1.778 10000 EAR99 MALAYSIA Check Availability

Distributor availability ofL4973V5.1

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 431 1 Order Now
ARROW EUROPE 1180 0 Order Now
MOUSER WORLDWIDE 429 1 Order Now
Farnell Element14 EUROPE 417 1 Order Now
ANGLIA Live EUROPE 1600 20 Order Now

Distributor reported inventory date: 2019-07-22

Distributor Name

RS COMPONENTS

Stock

431

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

1180

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

429

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

417

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

1600

Min.Order

20

Region

EUROPE Order Now

Distributor reported inventory date: 2019-07-22

Get sample

L4973D3.3

Package

SO-20

Packing Type

Tube

Unit Price (US$)

1.811*

Distributor availability ofL4973D3.3

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 272 1 Order Now
ARROW EUROPE 1360 0 Order Now
MOUSER WORLDWIDE 1570 1 Order Now
Farnell Element14 EUROPE 181 1 Order Now

Distributor reported inventory date: 2019-07-22

Distributor Name

RS COMPONENTS

Stock

272

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

1360

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

1570

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

181

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-07-22

Marketing Status

Active

Unit Price (US$)

1.811

Quantity

10000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

L4973D5.1-013TR

Package

SO-20

Packing Type

Tape And Reel

Unit Price (US$)

1.861*

Distributor availability ofL4973D5.1-013TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 877 1 Order Now
ARROW EUROPE 1000 0 Order Now
ARROW AMERICA 2000 1000 Order Now
MOUSER WORLDWIDE 2039 1 Order Now
ANGLIA Live EUROPE 23145 1 Order Now

Distributor reported inventory date: 2019-07-22

Distributor Name

DIGIKEY

Stock

877

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

1000

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

2000

Min.Order

1000

Region

AMERICA Order Now

MOUSER

Stock

2039

Min.Order

1

Region

WORLDWIDE Order Now

ANGLIA Live

Stock

23145

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-07-22

Marketing Status

Active

Unit Price (US$)

1.861

Quantity

10000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

L4973V3.3

Package

PDIP 18

Packing Type

Tube

Unit Price (US$)

1.693*

Marketing Status

Active

Unit Price (US$)

1.693

Quantity

10000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

L4973D3.3-013TR

Package

SO-20

Packing Type

Tape And Reel

Unit Price (US$)

1.811*

Distributor availability ofL4973D3.3-013TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 996 1 Order Now
FUTURE WORLDWIDE 2000 1000 Order Now
ARROW AMERICA 5000 1000 Order Now
MOUSER WORLDWIDE 479 1 Order Now

Distributor reported inventory date: 2019-07-22

Distributor Name

DIGIKEY

Stock

996

Min.Order

1

Region

WORLDWIDE Order Now

FUTURE

Stock

2000

Min.Order

1000

Region

WORLDWIDE Order Now

ARROW

Stock

5000

Min.Order

1000

Region

AMERICA Order Now

MOUSER

Stock

479

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-07-22

Marketing Status

Active

Unit Price (US$)

1.811

Quantity

10000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

L4973D5.1

Package

SO-20

Packing Type

Tube

Unit Price (US$)

1.861*

Distributor availability ofL4973D5.1

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 184 1 Order Now
ARROW EUROPE 37 0 Order Now
MOUSER WORLDWIDE 375 1 Order Now
ANGLIA Live EUROPE 307 1 Order Now

Distributor reported inventory date: 2019-07-22

Distributor Name

RS COMPONENTS

Stock

184

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

37

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

375

Min.Order

1

Region

WORLDWIDE Order Now

ANGLIA Live

Stock

307

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-07-22

Marketing Status

Active

Unit Price (US$)

1.861

Quantity

10000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

L4973V5.1

Package

PDIP 18

Packing Type

Tube

Unit Price (US$)

1.778*

Distributor availability ofL4973V5.1

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 431 1 Order Now
ARROW EUROPE 1180 0 Order Now
MOUSER WORLDWIDE 429 1 Order Now
Farnell Element14 EUROPE 417 1 Order Now
ANGLIA Live EUROPE 1600 20 Order Now

Distributor reported inventory date: 2019-07-22

Distributor Name

RS COMPONENTS

Stock

431

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

1180

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

429

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

417

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

1600

Min.Order

20

Region

EUROPE Order Now

Distributor reported inventory date: 2019-07-22

Marketing Status

Active

Unit Price (US$)

1.778

Quantity

10000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

(*) 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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      18.2
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    • Description Version Size Action
      AN1126
      Current sharing of the L4973 in a multiphase application
      1.2
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      Designing with L4973, 3.5 A high efficiency DC-DC converter

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Publications and Collaterals

    • Description Version Size Action
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Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
L4973D3.3
Active
SO-20 Industrial Ecopack2
L4973D3.3-013TR
Active
SO-20 Industrial Ecopack2
L4973D5.1
Active
SO-20 Industrial Ecopack2
L4973D5.1-013TR
Active
SO-20 Industrial Ecopack2
L4973V3.3
Active
PDIP 18 Industrial Ecopack1
L4973V5.1
Active
PDIP 18 Industrial Ecopack1

L4973D3.3

Package:

SO-20

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-20

Grade

Industrial

RoHS Compliance Grade

Ecopack2

L4973D3.3-013TR

Package:

SO-20

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-20

Grade

Industrial

RoHS Compliance Grade

Ecopack2

L4973D5.1

Package:

SO-20

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-20

Grade

Industrial

RoHS Compliance Grade

Ecopack2

L4973D5.1-013TR

Package:

SO-20

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-20

Grade

Industrial

RoHS Compliance Grade

Ecopack2

L4973V3.3

Package:

PDIP 18

Material Declaration**:

PDF XML

Marketing Status

Active

Package

PDIP 18

Grade

Industrial

RoHS Compliance Grade

Ecopack1

L4973V5.1

Package:

PDIP 18

Material Declaration**:

PDF XML

Marketing Status

Active

Package

PDIP 18

Grade

Industrial

RoHS Compliance Grade

Ecopack1

(**) 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.