3.5 A switching regulator

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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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Part Number
Package
Packing Type
Marketing Status
Budgetary Price (US$)*
Quantity
ECCN (US)
Country of Origin
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L4974A PDIP 20 Tube
Active
5.108 10000 EAR99 MALAYSIA Check Availability

Distributor availability ofL4974A

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 234 1 Order Now
ARROW EUROPE 260 0 Order Now
MOUSER WORLDWIDE 477 1 Order Now
Farnell Element14 EUROPE 222 1 Order Now
ANGLIA Live EUROPE 10 1 Order Now
RUTRONIK EUROPE 1680 20 Order Now

Distributor reported inventory date: 2019-09-15

Distributor Name

RS COMPONENTS

Stock

234

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

260

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

477

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

222

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

10

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

1680

Min.Order

20

Region

EUROPE Order Now

Distributor reported inventory date: 2019-09-15

Get sample

L4974A

Package

PDIP 20

Packing Type

Tube

Unit Price (US$)

5.108*

Distributor availability ofL4974A

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 234 1 Order Now
ARROW EUROPE 260 0 Order Now
MOUSER WORLDWIDE 477 1 Order Now
Farnell Element14 EUROPE 222 1 Order Now
ANGLIA Live EUROPE 10 1 Order Now
RUTRONIK EUROPE 1680 20 Order Now

Distributor reported inventory date: 2019-09-15

Distributor Name

RS COMPONENTS

Stock

234

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

260

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

477

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

222

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

10

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

1680

Min.Order

20

Region

EUROPE Order Now

Distributor reported inventory date: 2019-09-15

Marketing Status

Active

Unit Price (US$)

5.108

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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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.