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  • The L4978 is a step down monolithic power switching regulator delivering 2A 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, DIP-8 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 2A 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-BYPULSE AND HICCUP MODE)
    • OUTPUT VOLTAGE ADJUSTABLE FROM 3.3V TO 50V

Circuit Diagram

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STMicroelectronics - L4978

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Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
L4978
Active
DIP-8 Industrial Ecopack2
L4978D
Active
SO-16W Industrial Ecopack1
L4978D013TR
Active
SO-16W Industrial Ecopack1

L4978

Package:

DIP-8

Material Declaration**:

Marketing Status

Active

Package

DIP-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

L4978D

Package:

SO-16W

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-16W

Grade

Industrial

RoHS Compliance Grade

Ecopack1

L4978D013TR

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.

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
L4978D013TR Available at 3 distributors

Distributor availability ofL4978D013TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 5371 1 Order Now
COMPEL EUROPE 3057 1 Order Now
MOUSER WORLDWIDE 3599 1 Order Now

Distributor reported inventory date: 2020-10-28

Distributor Name

DIGIKEY

Stock

5371

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

3057

Min.Order

1

Region

EUROPE Order Now

MOUSER

Stock

3599

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-10-28

Free Sample Buy Direct
Active
EAR99 NEC Tape And Reel SO-16W -40 150 MALAYSIA 1.389 / 1k
L4978 Available at 7 distributors

Distributor availability ofL4978

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 793 1 Order Now
COMPEL EUROPE 2382 1 Order Now
FUTURE WORLDWIDE 545 1 Order Now
ARROW EUROPE 1885 0 Order Now
Newark Element14 AMERICA 78 0 Order Now
MOUSER WORLDWIDE 780 1 Order Now
Farnell Element14 EUROPE 812 1 Order Now

Distributor reported inventory date: 2020-10-28

Distributor Name

DIGIKEY

Stock

793

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

2382

Min.Order

1

Region

EUROPE Order Now

FUTURE

Stock

545

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

1885

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

78

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

780

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

812

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-28

Free Sample Buy Direct
Active
EAR99 NEC Tube DIP-8 -40 150 CHINA 1.389 / 1k
L4978D Available at 5 distributors

Distributor availability ofL4978D

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 1285 1 Order Now
Newark Element14 AMERICA 481 0 Order Now
ARROW AMERICA 9 1225 Order Now
MOUSER WORLDWIDE 1932 1 Order Now
Farnell Element14 EUROPE 264 1 Order Now

Distributor reported inventory date: 2020-10-28

Distributor Name

RS COMPONENTS

Stock

1285

Min.Order

1

Region

EUROPE Order Now

Newark Element14

Stock

481

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

9

Min.Order

1225

Region

AMERICA Order Now

MOUSER

Stock

1932

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

264

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-28

Buy Direct
Active
EAR99 NEC Tube SO-16W -40 150 MALAYSIA 1.389 / 1k

L4978D013TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

1.389 / 1k

Distributor availability ofL4978D013TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 5371 1 Order Now
COMPEL EUROPE 3057 1 Order Now
MOUSER WORLDWIDE 3599 1 Order Now

Distributor reported inventory date: 2020-10-28

Distributor Name

DIGIKEY

Stock

5371

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

3057

Min.Order

1

Region

EUROPE Order Now

MOUSER

Stock

3599

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-10-28

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SO-16W

Operating Temperature (°C)

(min)

-40

(max)

150

Budgetary Price (US$)* / Qty

1.389 / 1k

Country of Origin

MALAYSIA

L4978

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

1.389 / 1k

Distributor availability ofL4978

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 793 1 Order Now
COMPEL EUROPE 2382 1 Order Now
FUTURE WORLDWIDE 545 1 Order Now
ARROW EUROPE 1885 0 Order Now
Newark Element14 AMERICA 78 0 Order Now
MOUSER WORLDWIDE 780 1 Order Now
Farnell Element14 EUROPE 812 1 Order Now

Distributor reported inventory date: 2020-10-28

Distributor Name

DIGIKEY

Stock

793

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

2382

Min.Order

1

Region

EUROPE Order Now

FUTURE

Stock

545

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

1885

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

78

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

780

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

812

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-28

ECCN (EU)

NEC

Packing Type

Tube

Package

DIP-8

Operating Temperature (°C)

(min)

-40

(max)

150

Budgetary Price (US$)* / Qty

1.389 / 1k

Country of Origin

CHINA

L4978D

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

1.389 / 1k

Distributor availability ofL4978D

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 1285 1 Order Now
Newark Element14 AMERICA 481 0 Order Now
ARROW AMERICA 9 1225 Order Now
MOUSER WORLDWIDE 1932 1 Order Now
Farnell Element14 EUROPE 264 1 Order Now

Distributor reported inventory date: 2020-10-28

Distributor Name

RS COMPONENTS

Stock

1285

Min.Order

1

Region

EUROPE Order Now

Newark Element14

Stock

481

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

9

Min.Order

1225

Region

AMERICA Order Now

MOUSER

Stock

1932

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

264

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-28

ECCN (EU)

NEC

Packing Type

Tube

Package

SO-16W

Operating Temperature (°C)

(min)

-40

(max)

150

Budgetary Price (US$)* / Qty

1.389 / 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