36 V 400 mA synchronous step-down switching regulator

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  • The L6984 is a step-down monolithic switching regulator able to deliver up to 400 mA DC. The output voltage adjustability ranges from 0.9 V. The fixed 3.3 V VOUT requires no external resistor divider. The “Low Consumption Mode” (LCM) is designed for applications active during car parking, so it maximizes the efficiency at light load with controlled output voltage ripple. The “Low Noise Mode” (LNM) makes the switching frequency almost constant over the load current range, serving low noise application specification like car audio/sensors. The PGOOD open collector output can implement output voltage sequencing during the power-up phase. The synchronous rectification, designed for high efficiency at medium - heavy load, and the high switching frequency capability make the size of the application compact. Pulse-by-pulse current sensing on low-side power element implements an effective constant current protection.

    Key Features

    400 mA DC output current


    4.5 V to 36 V operating input voltage


    Synchronous rectification


    Low consumption mode or low noise mode


    75 μA IQ at light load (LCM VOUT = 3.3 V)


    13 μA IQ-SHTDWN


    Adjustable fSW (250 kHz - 600 kHz)
    Output voltage adjustable from 0.9 V


    No resistor divider required for 3.3 V VOUT


    VBIAS maximizes efficiency at light load


    350 mA valley current limit


    Constant on-time control scheme


    PGOOD open collector


    Thermal shutdown

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Part Number
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Budgetary Price (US$)*
Quantity
ECCN (US)
Country of Origin
Order from Distributors
Order from ST
L6984ATR DFN10 3X3 Tape And Reel
Active
0.813 1000 EAR99 PHILIPPINES Check Availability

Distributor availability ofL6984ATR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 3911 1 Order Now
MOUSER WORLDWIDE 10946 1 Order Now
Farnell Element14 EUROPE 4512 1 Order Now

Distributor reported inventory date: 2019-03-25

Distributor Name

DIGIKEY

Stock

3911

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

10946

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

4512

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-03-25

Buy direct
L6984TR VFDFPN 4X4X1.0 10L PITCH 0.50 Tape And Reel
Active
0.844 1000 EAR99 PHILIPPINES Check Availability

Distributor availability ofL6984TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 930 1 Order Now
ARROW EUROPE 24000 0 Order Now
MOUSER WORLDWIDE 6360 1 Order Now

Distributor reported inventory date: 2019-03-25

Distributor Name

DIGIKEY

Stock

930

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

24000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

6360

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-03-25

Buy direct

L6984ATR

Package

DFN10 3X3

Packing Type

Tape And Reel

Unit Price (US$)

0.813*

Distributor availability ofL6984ATR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 3911 1 Order Now
MOUSER WORLDWIDE 10946 1 Order Now
Farnell Element14 EUROPE 4512 1 Order Now

Distributor reported inventory date: 2019-03-25

Distributor Name

DIGIKEY

Stock

3911

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

10946

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

4512

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-03-25

Marketing Status

Active

Unit Price (US$)

0.813

Quantity

1000

ECCN (US)

EAR99

Country of Origin

PHILIPPINES

L6984TR

Package

VFDFPN 4X4X1.0 10L PITCH 0.50

Packing Type

Tape And Reel

Unit Price (US$)

0.844*

Distributor availability ofL6984TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 930 1 Order Now
ARROW EUROPE 24000 0 Order Now
MOUSER WORLDWIDE 6360 1 Order Now

Distributor reported inventory date: 2019-03-25

Distributor Name

DIGIKEY

Stock

930

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

24000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

6360

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-03-25

Marketing Status

Active

Unit Price (US$)

0.844

Quantity

1000

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

Evaluation Tools

    • Part Number

      High efficiency synchronous step-down regulator based on the L6984

00 Files Selected

Technical Documentation

    • Description Version Size Action
      DS9982
      36 V, 400 mA synchronous step-down switching regulator
      6.0
      4 MB
      PDF
      DS9982

      36 V, 400 mA synchronous step-down switching regulator

Publications and Collaterals

    • Description Version Size Action
      L6984, L6986 Energy saving synchronous DC-DC converters for industrial
      1.24 MB
      PDF

      L6984, L6986 Energy saving synchronous DC-DC converters for industrial

    • Description Version Size Action
      Brochure Power management guide 10.2018
      4.42 MB
      PDF
      Electric vehicle (EV) ecosystem 1.1
      1.28 MB
      PDF
      Switching Converters (DC-DC) – Quick Reference Guide 1.0
      481.92 KB
      PDF

      Brochure Power management guide

      Electric vehicle (EV) ecosystem

      Switching Converters (DC-DC) – Quick Reference Guide

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
L6984ATR
Active
DFN10 3X3 Industrial Ecopack2
L6984TR
Active
VFDFPN 4X4X1.0 10L PITCH 0.50 Industrial Ecopack2

L6984ATR

Package:

DFN10 3X3

Material Declaration**:

PDF XML

Marketing Status

Active

Package

DFN10 3X3

Grade

Industrial

RoHS Compliance Grade

Ecopack2

L6984TR

Package:

VFDFPN 4X4X1.0 10L PITCH 0.50

Material Declaration**:

Marketing Status

Active

Package

VFDFPN 4X4X1.0 10L PITCH 0.50

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.