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  • The L4972A is a stepdown monolithic power switching regulator delivering 2A 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 L4972 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 and SO20 large plastic packages 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
    • 2A 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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Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
L4972A
Active
PDIP 20 Industrial Ecopack1
L4972AD
Active
SO-20 Industrial Ecopack1 (*)
L4972AD013TR
Active
SO-20 Industrial Ecopack1 (*)

L4972A

Package:

PDIP 20

Material Declaration**:

Marketing Status

Active

Package

PDIP 20

Grade

Industrial

RoHS Compliance Grade

Ecopack1

L4972AD

Package:

SO-20

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-20

Grade

Industrial

RoHS Compliance Grade

Ecopack1 (*)

L4972AD013TR

Package:

SO-20

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-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
Marketing Status
ECCN (US)
ECCN (EU)
Packing Type
Package
Temperature (°C) Country of Origin
Budgetary Price (US$)*/Qty
min
max
L4972A Available at 4 distributors

Distributor availability ofL4972A

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 371 1 Order Now
ARROW EUROPE 242 0 Order Now
MOUSER WORLDWIDE 1258 1 Order Now
Farnell Element14 EUROPE 762 1 Order Now

Distributor reported inventory date: 2020-10-23

Distributor Name

DIGIKEY

Stock

371

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

242

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

1258

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

762

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-23

Free Sample Buy Direct
Active
EAR99 NEC Tube PDIP 20 - - MALAYSIA 2.033 / 1k
L4972AD Available at 6 distributors

Distributor availability ofL4972AD

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 556 1 Order Now
RS COMPONENTS EUROPE 179 1 Order Now
ARROW EUROPE 320 0 Order Now
Newark Element14 AMERICA 12 0 Order Now
MOUSER WORLDWIDE 557 1 Order Now
Farnell Element14 EUROPE 123 1 Order Now

Distributor reported inventory date: 2020-10-23

Distributor Name

DIGIKEY

Stock

556

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

179

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

320

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

12

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

557

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

123

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-23

Buy Direct
Active
EAR99 NEC Tube SO-20 - - MALAYSIA 2.033 / 1k
L4972AD013TR Available at 2 distributors

Distributor availability ofL4972AD013TR

Distributor Name
Region Stock Min. Order Third party link
FUTURE WORLDWIDE 1000 1000 Order Now
ARROW EUROPE 22000 0 Order Now

Distributor reported inventory date: 2020-10-23

Distributor Name

FUTURE

Stock

1000

Min.Order

1000

Region

WORLDWIDE Order Now

ARROW

Stock

22000

Min.Order

0

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-23

Free Sample Buy Direct
Active
EAR99 NEC Tape And Reel SO-20 - - MALAYSIA 2.033 / 1k

L4972A

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

2.033 / 1k

Distributor availability ofL4972A

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 371 1 Order Now
ARROW EUROPE 242 0 Order Now
MOUSER WORLDWIDE 1258 1 Order Now
Farnell Element14 EUROPE 762 1 Order Now

Distributor reported inventory date: 2020-10-23

Distributor Name

DIGIKEY

Stock

371

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

242

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

1258

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

762

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-23

ECCN (EU)

NEC

Packing Type

Tube

Package

PDIP 20

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

2.033 / 1k

Country of Origin

MALAYSIA

L4972AD

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

2.033 / 1k

Distributor availability ofL4972AD

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 556 1 Order Now
RS COMPONENTS EUROPE 179 1 Order Now
ARROW EUROPE 320 0 Order Now
Newark Element14 AMERICA 12 0 Order Now
MOUSER WORLDWIDE 557 1 Order Now
Farnell Element14 EUROPE 123 1 Order Now

Distributor reported inventory date: 2020-10-23

Distributor Name

DIGIKEY

Stock

556

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

179

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

320

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

12

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

557

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

123

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-23

ECCN (EU)

NEC

Packing Type

Tube

Package

SO-20

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

2.033 / 1k

Country of Origin

MALAYSIA

L4972AD013TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

2.033 / 1k

Distributor availability ofL4972AD013TR

Distributor Name
Region Stock Min. Order Third party link
FUTURE WORLDWIDE 1000 1000 Order Now
ARROW EUROPE 22000 0 Order Now

Distributor reported inventory date: 2020-10-23

Distributor Name

FUTURE

Stock

1000

Min.Order

1000

Region

WORLDWIDE Order Now

ARROW

Stock

22000

Min.Order

0

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-23

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SO-20

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

2.033 / 1k

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