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  • The L5987 is a step-down switching regulator with a 3.5 A (minimum) current limited embedded Power MOSFET, so it is able to deliver an up to 3 A current to the load depending on the application conditions.

    The input voltage can range from 2.9 V to 18 V, while the output voltage can be set starting from 0.6 V to VIN. Having a minimum input voltage of 2.9 V, the device is suitable also for a 3.3 V bus.
    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 VFQFPN8 and the HSOP packages with an exposed pad allow reducing the RthJAdown to 60 °C/W and 40 °C/W respectively.

    Key Features

    • 3 A DC output current
    • 2.9 V to 18 V input voltage
    • Output voltage adjustable from 0.6 V
    • 250 kHz switching frequency, programmable up to 1 MHz
    • Internal soft-start and inhibit
    • Low dropout operation: 100% duty cycle
    • Voltage feedforward
    • Zero load current operation
    • Overcurrent and thermal protection
    • VFQFPN 3 x 3 -8L and HSOP8 package

Circuit Diagram

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Evaluation Tools

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      3 A step-down switching regulator demonstration board based on the L5987, L5987A

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Technical Documentation

    • Description Version Size Action
      DS5917
      3 A step-down switching regulator
      4.0
      1,002.57 KB
      PDF
      DS5917

      3 A step-down switching regulator

    • Description Version Size Action
      TN1224
      Mounting instructions for SMD (surface mounting device) packages
      2.2
      1.06 MB
      PDF
      TN1224

      Mounting instructions for SMD (surface mounting device) packages

    • Description Version Size Action
      DN0011
      ST1S03 alternative topology: Using a buck in a negative buck-boost configuration
      1.2
      361.3 KB
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      DN0011

      ST1S03 alternative topology: Using a buck in a negative buck-boost configuration

Publications and Collaterals

    • Description Version Size Action
      Electric vehicle (EV) ecosystem 1.1
      1.28 MB
      PDF

      Electric vehicle (EV) ecosystem

Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
L5987A
Active
PowerSO-8 Industrial Ecopack2
L5987ATR
Active
PowerSO-8 Industrial Ecopack2
L5987TR
Active
DFN8 3x3 Industrial Ecopack2

L5987A

Package:

PowerSO-8

Material Declaration**:

Marketing Status

Active

Package

PowerSO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

L5987ATR

Package:

PowerSO-8

Material Declaration**:

Marketing Status

Active

Package

PowerSO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

L5987TR

Package:

DFN8 3x3

Material Declaration**:

Marketing Status

Active

Package

DFN8 3x3

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.

eDesignSuite

Converter

Input

V This option is required. And must be less than or equal to Volt. Max [V]
V This option is required. And must be greater than or equal to Volt. Min [V]

Output Power

V This option is required and must be a number.
A This option is required and must be a number.

Sample & Buy

Part Number
Order from Distributors
Order from ST
Package
Packing Type
Marketing Status
ECCN (US)
Country of Origin
Budgetary Price (US$)*/Qty
L5987TR Available at 4 distributors

Distributor availability ofL5987TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 3993 1 Order Now
ARROW EUROPE 4000 0 Order Now
MOUSER WORLDWIDE 2997 1 Order Now
Farnell Element14 EUROPE 4000 1 Order Now

Distributor reported inventory date: 2020-07-12

Distributor Name

DIGIKEY

Stock

3993

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

4000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

2997

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

4000

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-12

Get sample DFN8 3x3 Tape And Reel
Active
EAR99 PHILIPPINES 0.995 / 1k
L5987ATR Available at 4 distributors

Distributor availability ofL5987ATR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2643 1 Order Now
Newark Element14 AMERICA 85 0 Order Now
MOUSER WORLDWIDE 2669 1 Order Now
Farnell Element14 EUROPE 303 1 Order Now

Distributor reported inventory date: 2020-07-12

Distributor Name

DIGIKEY

Stock

2643

Min.Order

1

Region

WORLDWIDE Order Now

Newark Element14

Stock

85

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

2669

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

303

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-12

Get sample PowerSO-8 Tape And Reel
Active
EAR99 PHILIPPINES 0.995 / 1k
L5987A Available at 2 distributors

Distributor availability ofL5987A

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2087 1 Order Now
MOUSER WORLDWIDE 3996 1 Order Now

Distributor reported inventory date: 2020-07-12

Distributor Name

DIGIKEY

Stock

2087

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

3996

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-07-12

Buy now PowerSO-8 Tube
Active
EAR99 PHILIPPINES 0.995 / 1k

L5987TR

Package

DFN8 3x3

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.995 / 1k

Distributor availability ofL5987TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 3993 1 Order Now
ARROW EUROPE 4000 0 Order Now
MOUSER WORLDWIDE 2997 1 Order Now
Farnell Element14 EUROPE 4000 1 Order Now

Distributor reported inventory date: 2020-07-12

Distributor Name

DIGIKEY

Stock

3993

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

4000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

2997

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

4000

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-12

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.995 / 1k

ECCN (US)

EAR99

Country of Origin

PHILIPPINES

L5987ATR

Package

PowerSO-8

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.995 / 1k

Distributor availability ofL5987ATR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2643 1 Order Now
Newark Element14 AMERICA 85 0 Order Now
MOUSER WORLDWIDE 2669 1 Order Now
Farnell Element14 EUROPE 303 1 Order Now

Distributor reported inventory date: 2020-07-12

Distributor Name

DIGIKEY

Stock

2643

Min.Order

1

Region

WORLDWIDE Order Now

Newark Element14

Stock

85

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

2669

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

303

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-12

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.995 / 1k

ECCN (US)

EAR99

Country of Origin

PHILIPPINES

L5987A

Package

PowerSO-8

Packing Type

Tube

Budgetary Price (US$)*/Qty

0.995 / 1k

Distributor availability ofL5987A

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2087 1 Order Now
MOUSER WORLDWIDE 3996 1 Order Now

Distributor reported inventory date: 2020-07-12

Distributor Name

DIGIKEY

Stock

2087

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

3996

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-07-12

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.995 / 1k

ECCN (US)

EAR99

Country of Origin

PHILIPPINES

(*) 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