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  • The L4974A is a stepdown monolithic power switching regulator delivering 3.5A at a voltage variable from 5.1 to 40V.

    Realized with BCD mixed technology, the device uses a DMOS output transistor to obtain very high efficiency and very fast switching times. Features of the L4974A include reset and power fail for microprocessors, feed forward line regulation, soft start, limiting current and thermal protection. The device is mounted in a Powerdip 16 + 2 + 2 plastic package and requires few external components. Efficient operation at switching frequencies up to 200KHz allows reduction in the size and cost of external filter component.

    Key Features

    • PWM LATCH FOR SINGLE PULSE PER PERIOD
    • UNDER VOLTAGE LOCK OUT WITH HYSTERETIC TURN-ON
    • SWITCHING FREQUENCY UP TO 200KHz
    • VERY HIGH EFFICIENCY
    • CONTINUOUS MODE OPERATION
    • THERMAL SHUTDOWN
    • RESET AND POWER FAIL FUNCTIONS
    • PRECISE 5.1V ± 2% ON CHIP REFERENCE
    • 3.5A OUTPUT CURRENT
    • 0 TO 90% DUTY CYCLE RANGE
    • 5.1V TO 40V OUTPUT VOLTAGE RANGE
    • INTERNAL CURRENT LIMITING
    • INPUT/OUTPUT SYNC PIN
    • INTERNAL FEED-FORWARD LINE REG.

Circuit Diagram

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Technical Documentation

    • Description Version Size Action
      DS0068
      3.5A switching regulator
      2.2
      6.52 MB
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      DS0068

      3.5A switching regulator

    • Description Version Size Action
      TN1224
      Mounting instructions for SMD (surface mounting device) packages
      2.2
      1.06 MB
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      TN1224

      Mounting instructions for SMD (surface mounting device) packages

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Publications and Collaterals

    • Description Version Size Action
      Electric vehicle (EV) ecosystem 1.1
      1.28 MB
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      Electric vehicle (EV) ecosystem

Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
L4974A
Active
PDIP 20 Industrial Ecopack1

L4974A

Package:

PDIP 20

Material Declaration**:

Marketing Status

Active

Package

PDIP 20

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.

Sample & Buy

Part Number
Order from Distributors
Order from ST
Package
Packing Type
Marketing Status
ECCN (US)
Country of Origin
Budgetary Price (US$)*/Qty
L4974A Available at 6 distributors

Distributor availability ofL4974A

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 277 1 Order Now
ARROW EUROPE 1280 0 Order Now
MOUSER WORLDWIDE 411 1 Order Now
Farnell Element14 EUROPE 28 1 Order Now
ANGLIA Live EUROPE 5 1 Order Now
RUTRONIK EUROPE 300 20 Order Now

Distributor reported inventory date: 2020-07-07

Distributor Name

RS COMPONENTS

Stock

277

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

1280

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

411

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

28

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

5

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

300

Min.Order

20

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-07

Get sample PDIP 20 Tube
Active
EAR99 MALAYSIA 5.108 / 1k

L4974A

Package

PDIP 20

Packing Type

Tube

Budgetary Price (US$)*/Qty

5.108 / 1k

Distributor availability ofL4974A

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 277 1 Order Now
ARROW EUROPE 1280 0 Order Now
MOUSER WORLDWIDE 411 1 Order Now
Farnell Element14 EUROPE 28 1 Order Now
ANGLIA Live EUROPE 5 1 Order Now
RUTRONIK EUROPE 300 20 Order Now

Distributor reported inventory date: 2020-07-07

Distributor Name

RS COMPONENTS

Stock

277

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

1280

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

411

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

28

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

5

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

300

Min.Order

20

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-07

Marketing Status

Active

Budgetary Price (US$)* / Qty

5.108 / 1k

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