L7987

Active
Education

61 V 3 A asynchronous step-down switching regulator with adjustable current limitation

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  • The L7987 device is a step-down monolithic switching regulator able to deliver up to 3 A DC. The output voltage adjustability ranges from 0.8 V to VIN. The wide input voltage range and the 100% duty cycle capability meet the fail safe specifications for industrial systems. The embedded switchover feature on the VBIASpin maximizes the efficiency at light load. The adjustable current limitation, designed to select the inductor RMS current accordingly with the nominal output current, and the high switching frequency capability make the size of the application compact. Pulse-by-pulse current sensing with digital frequency foldback implements an effective constant current protection over the different application conditions. The peak current foldback decreases the stress of the power components in heavy short-circuit condition. The PGOOD open collector output can also implement output voltage sequencing during the power-up phase. Multiple devices can be synchronized sharing the SYNCH pin to prevent beating noise in low noise applications like sensors with A/D conversion.

    Key Features

    • 3 A DC output current
    • 4.5 V to 61 V operating input voltage
    • RDS,ON= 250 mΩ typ.
    • Adjustable fSW(250 kHz - 1.5 MHz)
    • Low IQ-SHD (11 μA typ. from VIN)
    • Low IQ (1 mA typ. - VIN24 V - VOUT3.3 V)
    • Output voltage adjustable from 0.8 V to VIN
    • Synchronization
    • Adjustable soft-start time
    • Adjustable current limitation
    • Low dropout operation (12 μs max.)
    • VBIASimproves efficiency at light load
    • PGOOD open collector output
    • Output voltage sequencing
    • Digital frequency foldback in short-circuit
    • Peak current foldback in short-circuit
    • Auto-recovery thermal shutdown

Recommended for you

Related Applications

Energy generation and distribution

Factory Automation

Home, Building and City Automation

Lighting and Controls

Power Supplies and Converters

Smart Farming

Mobility Services

All tools & software

    • Part number
      Status
      Description
      Type
      Supplier

      STEVAL-ISA152V1

      Active

      3.3 V/3 A high efficiency step down DC-DC converter (VIN= 4.5 to 60 V) based on the L7987

      PSU and Converter Solution Eval Boards --
      STEVAL-ISA152V1

      Description:

      3.3 V/3 A high efficiency step down DC-DC converter (VIN= 4.5 to 60 V) based on the L7987

CAD/EDA Symbols, Footprints and Models

Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
L7987
Active
HTSSOP16 Industrial Ecopack2
L7987TR
Active
HTSSOP16 Industrial Ecopack2

L7987

Package:

HTSSOP16

Material Declaration**:

Marketing Status

Active

Package

HTSSOP16

Grade

Industrial

RoHS Compliance Grade

Ecopack2

L7987TR

Package:

HTSSOP16

Material Declaration**:

Marketing Status

Active

Package

HTSSOP16

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

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
Marketing Status
ECCN (US)
ECCN (EU)
Packing Type
Package
Temperature (°C) Country of Origin
Budgetary Price (US$)*/Qty
min
max
L7987TR Available at 3 distributors

Distributor availability ofL7987TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1297 1 Order Now
AVNET AMERICA 5000 0 Order Now
MOUSER WORLDWIDE 1450 1 Order Now

Distributor reported inventory date: 2020-10-23

Distributor Name

DIGIKEY

Stock

1297

Min.Order

1

Region

WORLDWIDE Order Now

AVNET

Stock

5000

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

1450

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-10-23

Buy Direct
Active
EAR99 NEC Tape And Reel HTSSOP16 - - PHILIPPINES 1.25 / 1k
L7987 Available at 5 distributors

Distributor availability ofL7987

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 4982 1 Order Now
COMPEL EUROPE 2262 1 Order Now
FUTURE WORLDWIDE 807 1 Order Now
Newark Element14 AMERICA 26 0 Order Now
MOUSER WORLDWIDE 7305 1 Order Now

Distributor reported inventory date: 2020-10-23

Distributor Name

DIGIKEY

Stock

4982

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

2262

Min.Order

1

Region

EUROPE Order Now

FUTURE

Stock

807

Min.Order

1

Region

WORLDWIDE Order Now

Newark Element14

Stock

26

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

7305

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-10-23

Buy Direct
Active
EAR99 NEC Tube HTSSOP16 - - PHILIPPINES 1.25 / 1k

L7987TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

1.25 / 1k

Distributor availability ofL7987TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1297 1 Order Now
AVNET AMERICA 5000 0 Order Now
MOUSER WORLDWIDE 1450 1 Order Now

Distributor reported inventory date: 2020-10-23

Distributor Name

DIGIKEY

Stock

1297

Min.Order

1

Region

WORLDWIDE Order Now

AVNET

Stock

5000

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

1450

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-10-23

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

HTSSOP16

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

1.25 / 1k

Country of Origin

PHILIPPINES

L7987

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

1.25 / 1k

Distributor availability ofL7987

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 4982 1 Order Now
COMPEL EUROPE 2262 1 Order Now
FUTURE WORLDWIDE 807 1 Order Now
Newark Element14 AMERICA 26 0 Order Now
MOUSER WORLDWIDE 7305 1 Order Now

Distributor reported inventory date: 2020-10-23

Distributor Name

DIGIKEY

Stock

4982

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

2262

Min.Order

1

Region

EUROPE Order Now

FUTURE

Stock

807

Min.Order

1

Region

WORLDWIDE Order Now

Newark Element14

Stock

26

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

7305

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-10-23

ECCN (EU)

NEC

Packing Type

Tube

Package

HTSSOP16

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

1.25 / 1k

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