L4978

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2A Step down switching regulator

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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

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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**:

PDF XML

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

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Part Number
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Marketing Status
ECCN (US)
ECCN (EU)
Packing Type
Package
Temperature (°C) Country of Origin
Budgetary Price (US$)*/Qty
min
max
L4978D013TR Available at distributors

Distributor availability of L4978D013TR

Distributor Name
Region Stock Min. Order Third party link

Distributor reported inventory date:

No availability of distributors reported, please contact our sales office
Active
EAR99 NEC Tape and Reel SO-16W -40 150 MALAYSIA
L4978 Available at distributors

Distributor availability of L4978

Distributor Name
Region Stock Min. Order Third party link

Distributor reported inventory date:

No availability of distributors reported, please contact our sales office
Active
EAR99 NEC Tube DIP-8 -40 150 CHINA
L4978D Available at distributors

Distributor availability of L4978D

Distributor Name
Region Stock Min. Order Third party link

Distributor reported inventory date:

No availability of distributors reported, please contact our sales office
Active
EAR99 NEC Tube SO-16W -40 150 MALAYSIA

L4978D013TR Active

Package:
SO-16W
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

Part Number:

L4978D013TR

ECCN (EU):

NEC

Packing Type:

Tape and Reel

Operating Temperature (°C)

Min:

-40

Max:

150

Country of Origin:

MALAYSIA

Distributor Name

Distributor reported inventory date:

L4978 Active

Package:
DIP-8
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

Part Number:

L4978

ECCN (EU):

NEC

Packing Type:

Tube

Operating Temperature (°C)

Min:

-40

Max:

150

Country of Origin:

CHINA

Distributor Name

Distributor reported inventory date:

L4978D Active

Package:
SO-16W
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

Part Number:

L4978D

ECCN (EU):

NEC

Packing Type:

Tube

Operating Temperature (°C)

Min:

-40

Max:

150

Country of Origin:

MALAYSIA

Distributor Name

Distributor reported inventory date:

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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