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

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ECCN (US)
Country of Origin
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L7987TR HTSSOP16 Tape And Reel
Active
1.25 10000 EAR99 - Check Availability

Distributor availability ofL7987TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2460 1 Order Now
AVNET AMERICA 2500 0 Order Now
ARROW EUROPE 2500 0 Order Now
MOUSER WORLDWIDE 1800 1 Order Now
RUTRONIK EUROPE 17500 2500 Order Now

Distributor reported inventory date: 2019-09-15

Distributor Name

DIGIKEY

Stock

2460

Min.Order

1

Region

WORLDWIDE Order Now

AVNET

Stock

2500

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

2500

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

1800

Min.Order

1

Region

WORLDWIDE Order Now

RUTRONIK

Stock

17500

Min.Order

2500

Region

EUROPE Order Now

Distributor reported inventory date: 2019-09-15

Buy now
L7987 HTSSOP16 Tube
Active
1.25 10000 EAR99 - Check Availability

Distributor availability ofL7987

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 5957 1 Order Now
Newark Element14 AMERICA 26 0 Order Now
MOUSER WORLDWIDE 9541 1 Order Now
Farnell Element14 EUROPE 240 1 Order Now

Distributor reported inventory date: 2019-09-15

Distributor Name

DIGIKEY

Stock

5957

Min.Order

1

Region

WORLDWIDE Order Now

Newark Element14

Stock

26

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

9541

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

240

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-09-15

Buy now

L7987TR

Package

HTSSOP16

Packing Type

Tape And Reel

Unit Price (US$)

1.25*

Distributor availability ofL7987TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2460 1 Order Now
AVNET AMERICA 2500 0 Order Now
ARROW EUROPE 2500 0 Order Now
MOUSER WORLDWIDE 1800 1 Order Now
RUTRONIK EUROPE 17500 2500 Order Now

Distributor reported inventory date: 2019-09-15

Distributor Name

DIGIKEY

Stock

2460

Min.Order

1

Region

WORLDWIDE Order Now

AVNET

Stock

2500

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

2500

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

1800

Min.Order

1

Region

WORLDWIDE Order Now

RUTRONIK

Stock

17500

Min.Order

2500

Region

EUROPE Order Now

Distributor reported inventory date: 2019-09-15

Marketing Status

Active

Unit Price (US$)

1.25

Quantity

10000

ECCN (US)

EAR99

Country of Origin

-

L7987

Package

HTSSOP16

Packing Type

Tube

Unit Price (US$)

1.25*

Distributor availability ofL7987

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 5957 1 Order Now
Newark Element14 AMERICA 26 0 Order Now
MOUSER WORLDWIDE 9541 1 Order Now
Farnell Element14 EUROPE 240 1 Order Now

Distributor reported inventory date: 2019-09-15

Distributor Name

DIGIKEY

Stock

5957

Min.Order

1

Region

WORLDWIDE Order Now

Newark Element14

Stock

26

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

9541

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

240

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-09-15

Marketing Status

Active

Unit Price (US$)

1.25

Quantity

10000

ECCN (US)

EAR99

Country of Origin

-

(*) 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

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Evaluation Tools

    • Part Number

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

00 Files selected for download

Technical Documentation

    • Description Version Size Action
      DS10053
      61 V 3 A asynchronous step-down switching regulator with adjustable current limitation
      3.0
      2.34 MB
      PDF
      DS10053

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

HW Model, CAD Libraries & SVD

    • Description Version Size Action
      L7987 Pspice model 1.0
      241.29 KB
      ZIP

      L7987 Pspice model

Publications and Collaterals

    • Description Version Size Action
      DC-DC converters
      557.92 KB
      PDF

      DC-DC converters

    • Description Version Size Action
      Electric vehicle (EV) ecosystem 1.1
      1.28 MB
      PDF
      Switching Converters (DC-DC) – Quick Reference Guide 1.0
      481.92 KB
      PDF

      Electric vehicle (EV) ecosystem

      Switching Converters (DC-DC) – Quick Reference Guide

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**:

PDF XML

Marketing Status

Active

Package

HTSSOP16

Grade

Industrial

RoHS Compliance Grade

Ecopack2

L7987TR

Package:

HTSSOP16

Material Declaration**:

PDF XML

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 Power

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