L4974A

NRND
Design Win

3.5 A switching regulator

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Product overview

Description

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.
  • All 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

EDA Symbols, Footprints and 3D Models

STMicroelectronics - L4974A

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Quality and Reliability

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

L4974A

Package:

PDIP 20

Material Declaration**:

Marketing Status

NRND

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

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Part Number
Order from distributors
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Marketing Status
ECCN (US)
ECCN (EU)
Packing Type
Package
Temperature (°C) Country of Origin
Budgetary Price (US$)*/Qty
min
max
L4974A Available at 4 distributors

Distributor availability ofL4974A

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1372 1 Buy from Distributor
RS COMPONENTS EUROPE 194 1 Buy from Distributor
MOUSER WORLDWIDE 130 1 Buy from Distributor
Farnell Element14 EUROPE 949 1 Buy from Distributor

Distributor reported inventory date: 2022-07-01

Distributor Name

DIGIKEY

Stock

1372

Min.Order

1

Region

WORLDWIDE Buy from Distributor

RS COMPONENTS

Stock

194

Min.Order

1

MOUSER

Stock

130

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Farnell Element14

Stock

949

Min.Order

1

Distributor reported inventory date: 2022-07-01

NRND
EAR99 NEC Tube PDIP 20 - - MALAYSIA

L4974A NRND

Package:
PDIP 20
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

Part Number:

L4974A

ECCN (EU):

NEC

Packing Type:

Tube

Operating Temperature (°C)

Min:

-

Max:

-

Country of Origin:

MALAYSIA

Distributor availability ofL4974A

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1372 1 Buy from Distributor
RS COMPONENTS EUROPE 194 1 Buy from Distributor
MOUSER WORLDWIDE 130 1 Buy from Distributor
Farnell Element14 EUROPE 949 1 Buy from Distributor

Distributor reported inventory date: 2022-07-01

Distributor Name

DIGIKEY

Stock

1372

Min.Order

1

Region

WORLDWIDE Buy from Distributor

RS COMPONENTS

Stock

194

Min.Order

1

MOUSER

Stock

130

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Farnell Element14

Stock

949

Min.Order

1

Distributor reported inventory date: 2022-07-01

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(*) Suggested Resale Price (USD) per defined quantity for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors