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  • The L4971 is a step down monolithic power switching regulator delivering 1.5A at a voltage between 3.3V and 50V (selected by a simple external divider). Realized in BCD mixed technology, the device uses an internal power D-MOS transistor (with a typical Rdson of 0.25Ω) to obtain very high efficency and high switching speed.

    A switching frequency up to 300KHz is achievable (the maximum power dissipation of the packages must be observed).
    A wide input voltage range between 8V to 55V and output voltages regulated from 3.3V to 50V cover the majority of today’s applications.
    Features of this new generations of DC-DC converter include pulse-by-pulse current limit, hiccup mode for short circuit protection, voltage feedforward regulation, soft-start, protection against feedback loop disconnection, inhibit for zero current consumption and thermal shutdown.
    The device is available in plastic dual in line, DIP8 for standard assembly, and SO16W for SMD assembly.

    Key Features

    • PROTECTION AGAINST FEEDBACK DISCONNECTION
    • INHIBIT FOR ZERO CURRENT CONSUMPTION
    • SOFT START FUNCTION
    • THERMAL SHUTDOWN
    • ZERO LOAD CURRENT OPERATION
    • VOLTAGE FEEDFORWARD
    • UP TO 1.5A STEP DOWN CONVERTER
    • PRECISE 3.3V (±1%) INTERNAL REFERENCE VOLTAGE
    • OPERATING INPUT VOLTAGE FROM 8V TO 55V
    • SWITCHING FREQUENCY ADJUSTABLE UP TO 300KHz
    • INTERNAL CURRENT LIMITING (PULSE-BY PULSE AND HICCUP MODE)
    • OUTPUT VOLTAGE ADJUSTABLE FROM 3.3V TO 50V

Sample & Buy

Part Number
Package
Packing Type
Marketing Status
Budgetary Price (US$)*
Quantity
ECCN (US)
Country of Origin
Order from Distributors
Order from ST
L4971 DIP-8 Tube
Active
1.185 10000 EAR99 MALAYSIA Check Availability

Distributor availability ofL4971

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 2543 1 Order Now
ARROW EUROPE 18804 0 Order Now
P&S ASIA/PACIFIC 40 1 Order Now
MOUSER WORLDWIDE 1275 1 Order Now
ANGLIA Live EUROPE 36950 50 Order Now

Distributor reported inventory date: 2019-08-08

Distributor Name

RS COMPONENTS

Stock

2543

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

18804

Min.Order

0

Region

EUROPE Order Now

P&S

Stock

40

Min.Order

1

Region

ASIA/PACIFIC Order Now

MOUSER

Stock

1275

Min.Order

1

Region

WORLDWIDE Order Now

ANGLIA Live

Stock

36950

Min.Order

50

Region

EUROPE Order Now

Distributor reported inventory date: 2019-08-08

Get sample
L4971D SO-16W Tube
Active
1.354 10000 EAR99 MALAYSIA Check Availability

Distributor availability ofL4971D

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 483 1 Order Now
RS COMPONENTS EUROPE 328 1 Order Now
FUTURE WORLDWIDE 1076 1 Order Now
ARROW EUROPE 969 0 Order Now
MOUSER WORLDWIDE 1501 1 Order Now
Farnell Element14 EUROPE 200 1 Order Now

Distributor reported inventory date: 2019-08-08

Distributor Name

DIGIKEY

Stock

483

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

328

Min.Order

1

Region

EUROPE Order Now

FUTURE

Stock

1076

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

969

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

1501

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

200

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-08-08

Buy now
L4971D013TR SO-16W Tape And Reel
Active
1.354 10000 EAR99 MALAYSIA Check Availability

Distributor availability ofL4971D013TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 852 1 Order Now
RS COMPONENTS EUROPE 104 1 Order Now
AVNET AMERICA 64000 0 Order Now
ARROW EUROPE 8000 0 Order Now
ARROW AMERICA 3000 1000 Order Now
Farnell Element14 EUROPE 798 1 Order Now
RUTRONIK EUROPE 7000 1000 Order Now

Distributor reported inventory date: 2019-08-08

Distributor Name

DIGIKEY

Stock

852

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

104

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

64000

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

8000

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

3000

Min.Order

1000

Region

AMERICA Order Now

Farnell Element14

Stock

798

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

7000

Min.Order

1000

Region

EUROPE Order Now

Distributor reported inventory date: 2019-08-08

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L4971

Package

DIP-8

Packing Type

Tube

Unit Price (US$)

1.185*

Distributor availability ofL4971

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 2543 1 Order Now
ARROW EUROPE 18804 0 Order Now
P&S ASIA/PACIFIC 40 1 Order Now
MOUSER WORLDWIDE 1275 1 Order Now
ANGLIA Live EUROPE 36950 50 Order Now

Distributor reported inventory date: 2019-08-08

Distributor Name

RS COMPONENTS

Stock

2543

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

18804

Min.Order

0

Region

EUROPE Order Now

P&S

Stock

40

Min.Order

1

Region

ASIA/PACIFIC Order Now

MOUSER

Stock

1275

Min.Order

1

Region

WORLDWIDE Order Now

ANGLIA Live

Stock

36950

Min.Order

50

Region

EUROPE Order Now

Distributor reported inventory date: 2019-08-08

Marketing Status

Active

Unit Price (US$)

1.185

Quantity

10000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

L4971D

Package

SO-16W

Packing Type

Tube

Unit Price (US$)

1.354*

Distributor availability ofL4971D

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 483 1 Order Now
RS COMPONENTS EUROPE 328 1 Order Now
FUTURE WORLDWIDE 1076 1 Order Now
ARROW EUROPE 969 0 Order Now
MOUSER WORLDWIDE 1501 1 Order Now
Farnell Element14 EUROPE 200 1 Order Now

Distributor reported inventory date: 2019-08-08

Distributor Name

DIGIKEY

Stock

483

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

328

Min.Order

1

Region

EUROPE Order Now

FUTURE

Stock

1076

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

969

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

1501

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

200

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-08-08

Marketing Status

Active

Unit Price (US$)

1.354

Quantity

10000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

L4971D013TR

Package

SO-16W

Packing Type

Tape And Reel

Unit Price (US$)

1.354*

Distributor availability ofL4971D013TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 852 1 Order Now
RS COMPONENTS EUROPE 104 1 Order Now
AVNET AMERICA 64000 0 Order Now
ARROW EUROPE 8000 0 Order Now
ARROW AMERICA 3000 1000 Order Now
Farnell Element14 EUROPE 798 1 Order Now
RUTRONIK EUROPE 7000 1000 Order Now

Distributor reported inventory date: 2019-08-08

Distributor Name

DIGIKEY

Stock

852

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

104

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

64000

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

8000

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

3000

Min.Order

1000

Region

AMERICA Order Now

Farnell Element14

Stock

798

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

7000

Min.Order

1000

Region

EUROPE Order Now

Distributor reported inventory date: 2019-08-08

Marketing Status

Active

Unit Price (US$)

1.354

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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Technical Documentation

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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
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      Switching Converters (DC-DC) – Quick Reference Guide

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
L4971
Active
DIP-8 Industrial Ecopack2 (**)
L4971D
Active
SO-16W Industrial Ecopack1
L4971D013TR
Active
SO-16W Industrial Ecopack1

L4971

Package:

DIP-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

DIP-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2 (**)

L4971D

Package:

SO-16W

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-16W

Grade

Industrial

RoHS Compliance Grade

Ecopack1

L4971D013TR

Package:

SO-16W

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-16W

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.