L4978

Active

2A Step down switching regulator

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Overview
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Sample & Buy
Solutions
Documentation
CAD Resources
Tools & Software
Quality & Reliability
Partner products
Sales Briefcase

Product overview

Description

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.
  • All 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

EDA Symbols, Footprints and 3D Models

STMicroelectronics - L4978

Speed up your design by downloading all the EDA symbols, footprints and 3D models for your application. You have access to a large number of CAD formats to fit with your design toolchain.

Symbols

Symbols

Footprints

Footprints

3D model

3D models

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 No availability of distributors reported, please contact our sales office
Active
EAR99 NEC Tape And Reel SO-16W -40 150 MALAYSIA 1.389 / 1k
L4978 Available at 5 distributors

Distributor availability ofL4978

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 527 1 Buy from Distributor
FUTURE WORLDWIDE 75 1 Buy from Distributor
Newark Element14 AMERICA 33 0 Buy from Distributor
MOUSER WORLDWIDE 37 1 Buy from Distributor
Farnell Element14 EUROPE 126 1 Buy from Distributor

Distributor reported inventory date: 2021-10-20

Distributor Name

DIGIKEY

Stock

527

Min.Order

1

Region

WORLDWIDE Buy from Distributor

FUTURE

Stock

75

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Newark Element14

Stock

33

Min.Order

0

Region

AMERICA Buy from Distributor

MOUSER

Stock

37

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Farnell Element14

Stock

126

Min.Order

1

Distributor reported inventory date: 2021-10-20

Buy Direct
Active
EAR99 NEC Tube DIP-8 -40 150 CHINA 1.389 / 1k
L4978D Available at 4 distributors

Distributor availability ofL4978D

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 398 1 Buy from Distributor
Newark Element14 AMERICA 91 0 Buy from Distributor
MOUSER WORLDWIDE 855 1 Buy from Distributor
Farnell Element14 EUROPE 260 1 Buy from Distributor

Distributor reported inventory date: 2021-10-20

Distributor Name

RS COMPONENTS

Stock

398

Min.Order

1

Newark Element14

Stock

91

Min.Order

0

Region

AMERICA Buy from Distributor

MOUSER

Stock

855

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Farnell Element14

Stock

260

Min.Order

1

Distributor reported inventory date: 2021-10-20

Buy Direct
Active
EAR99 NEC Tube SO-16W -40 150 MALAYSIA 1.5279 / 1k

L4978D013TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

1.389 / 1k

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 527 1 Buy from Distributor
FUTURE WORLDWIDE 75 1 Buy from Distributor
Newark Element14 AMERICA 33 0 Buy from Distributor
MOUSER WORLDWIDE 37 1 Buy from Distributor
Farnell Element14 EUROPE 126 1 Buy from Distributor

Distributor reported inventory date: 2021-10-20

Distributor Name

DIGIKEY

Stock

527

Min.Order

1

Region

WORLDWIDE Buy from Distributor

FUTURE

Stock

75

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Newark Element14

Stock

33

Min.Order

0

Region

AMERICA Buy from Distributor

MOUSER

Stock

37

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Farnell Element14

Stock

126

Min.Order

1

Distributor reported inventory date: 2021-10-20

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

1.5279 / 1k

Distributor availability ofL4978D

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 398 1 Buy from Distributor
Newark Element14 AMERICA 91 0 Buy from Distributor
MOUSER WORLDWIDE 855 1 Buy from Distributor
Farnell Element14 EUROPE 260 1 Buy from Distributor

Distributor reported inventory date: 2021-10-20

Distributor Name

RS COMPONENTS

Stock

398

Min.Order

1

Newark Element14

Stock

91

Min.Order

0

Region

AMERICA Buy from Distributor

MOUSER

Stock

855

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Farnell Element14

Stock

260

Min.Order

1

Distributor reported inventory date: 2021-10-20

ECCN (EU)

NEC

Packing Type

Tube

Package

SO-16W

Operating Temperature (°C)

(min)

-40

(max)

150

Budgetary Price (US$)* / Qty

1.5279 / 1k

Country of Origin

MALAYSIA

(*) 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