L7981

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3 A step-down switching regulator

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Product overview

Description

The L7981 device is a step-down switching regulator with a 3.7 A (minimum) current limited embedded Power MOSFET, so it is able to deliver up to 3 A current to the load depending on the application conditions.

The input voltage can range from 4.5 V to 28 V, while the output voltage can be set starting from 0.6 V to VIN.

Requiring a minimum set of external components, the device includes an internal 250 kHz switching frequency oscillator that can be externally adjusted up to 1 MHz.

The QFN and the HSOP packages with exposed pad allow reducing the RthJAdown to 60°C/W and 40°C/W respectively.

  • All features

    • 3 A DC output current
    • 4.5 V to 28 V input voltage
    • Output voltage adjustable from 0.6 V
    • 250 kHz switching frequency, programmable up to 1 MHz
    • Internal soft-start and enable
    • Low dropout operation: 100% duty cycle
    • Voltage feed-forward
    • Zero load current operation
    • Overcurrent and thermal protection
    • VFQFPN 3 x 3 - 8L and HSOP8 package

Circuit Diagram

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Input Specification
Input Specification
V
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V
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Output
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A
this option is required
Output Power: 0

EDA Symbols, Footprints and 3D Models

STMicroelectronics - L7981

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Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
L7981A
Active
PowerSO-8 Industrial Ecopack2
L7981ATR
Active
PowerSO-8 Industrial Ecopack2
L7981TR
Active
QFN-8L P 0.5 mm Industrial Ecopack2

L7981A

Package:

PowerSO-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

PowerSO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

L7981ATR

Package:

PowerSO-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

PowerSO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

L7981TR

Package:

QFN-8L P 0.5 mm

Material Declaration**:

PDF XML

Marketing Status

Active

Package

QFN-8L P 0.5 mm

Grade

Industrial

RoHS Compliance Grade

Ecopack2

(**) 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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Order from ST
Marketing Status
ECCN (US)
ECCN (EU)
Packing Type
Package
Temperature (°C) Country of Origin
Budgetary Price (US$)*/Qty
min
max
L7981A Available at distributors

Distributor availability of L7981A

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 PowerSO-8 -40 150 PHILIPPINES
L7981TR Available at distributors

Distributor availability of L7981TR

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 QFN-8L P 0.5 mm -40 150 PHILIPPINES
L7981ATR Available at distributors

Distributor availability of L7981ATR

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 PowerSO-8 -40 150 PHILIPPINES

L7981A Active

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

Part Number:

L7981A

ECCN (EU):

NEC

Packing Type:

Tube

Operating Temperature (°C)

Min:

-40

Max:

150

Country of Origin:

PHILIPPINES

Distributor Name

Distributor reported inventory date:

L7981TR Active

Package:
QFN-8L P 0.5 mm
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

Part Number:

L7981TR

ECCN (EU):

NEC

Packing Type:

Tape and Reel

Operating Temperature (°C)

Min:

-40

Max:

150

Country of Origin:

PHILIPPINES

L7981ATR Active

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

Part Number:

L7981ATR

ECCN (EU):

NEC

Packing Type:

Tape and Reel

Operating Temperature (°C)

Min:

-40

Max:

150

Country of Origin:

PHILIPPINES

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