38 V, 1.5 A synchronous step-down converter with low quiescent current

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Product overview

Description

The L6981 is an easy to use synchronous monolithic step-down regulator capable of delivering up to 1.5 A DC to the load. The wide input voltage range makes the device suitable for a broad range of applications. The L6981 is based on a peak current mode architecture and is packaged in an SO8 with internal compensation, thus minimizing design complexity and size. The L6981 is available both in low consumption mode (LCM) and low noise mode (LNM) versions. LCM maximizes the efficiency at light-load with controlled output voltage ripple so the device is suitable for battery-powered applications. LNM makes the switching frequency constant and minimizes the output voltage ripple for light-load operations, meeting the specification for low noise sensitive applications.
The EN pin provides enable/disable functionality. The typical shutdown current is 2 µA when disabled. As soon as the EN pin is pulled up the device is enabled and the internal 1.3 ms soft-start takes place. Pulse-by-pulse current sensing on both power elements implements an effective constant current protection and thermal shutdown prevents thermal run-away.
  • All features

    • 3.5 V to 38 V operating input voltage
    • Output voltage from 0.85 V to VIN
    • 1.5 A DC output current
    • Internal compensation network
    • Two different versions: LCM for high efficiency at light-loads and LNM for noise sensitive applications
    • 2 μA shutdown current
    • Internal soft-start
    • Enable
    • Overvoltage protection
    • Output voltage sequencing
    • Thermal protection
    • Synchronization to external clock for LNM devices
    • SO8 package

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    • Part number
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      STEVAL-L6981CDR

      Active

      38 V, 1.5 A synchronous step-down switching regulator evaluation board based on the L6981CDR

      AC-DC Converter ST
      STEVAL-L6981CDR

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      38 V, 1.5 A synchronous step-down switching regulator evaluation board based on the L6981CDR

      STEVAL-L6981NDR

      Active

      38 V, 1.5 A synchronous step-down switching regulator evaluation board based on the L6981NDR

      DC-DC Converter ST
      STEVAL-L6981NDR

      Description:

      38 V, 1.5 A synchronous step-down switching regulator evaluation board based on the L6981NDR

EDA Symbols, Footprints and 3D Models

STMicroelectronics - L6981

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Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
L6981CDR
Active
SO-8 Industrial Ecopack2
L6981NDR
Active
SO-8 Industrial Ecopack2

L6981CDR

Package:

SO-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

L6981NDR

Package:

SO-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-8

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.

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

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
L6981CDR Available at 2 distributors

Distributor availability ofL6981CDR

Distributor Name
Region Stock Min. Order Third party link
MOUSER WORLDWIDE 5374 1 Buy from Distributor
ANGLIA Live EUROPE 20 2500 Buy from Distributor

Distributor reported inventory date: 2022-05-04

Distributor Name

MOUSER

Stock

5374

Min.Order

1

Region

WORLDWIDE Buy from Distributor

ANGLIA Live

Stock

20

Min.Order

2500

Distributor reported inventory date: 2022-05-04

Active
EAR99 NEC Tape And Reel SO-8 - - CHINA
L6981NDR Available at 1 distributors

Distributor availability ofL6981NDR

Distributor Name
Region Stock Min. Order Third party link
ANGLIA Live EUROPE 2500 2500 Buy from Distributor

Distributor reported inventory date: 2022-05-02

Distributor Name

ANGLIA Live

Stock

2500

Min.Order

2500

Distributor reported inventory date: 2022-05-02

Active
EAR99 NEC Tape And Reel SO-8 - - CHINA

L6981CDR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

Distributor availability ofL6981CDR

Distributor Name
Region Stock Min. Order Third party link
MOUSER WORLDWIDE 5374 1 Buy from Distributor
ANGLIA Live EUROPE 20 2500 Buy from Distributor

Distributor reported inventory date: 2022-05-04

Distributor Name

MOUSER

Stock

5374

Min.Order

1

Region

WORLDWIDE Buy from Distributor

ANGLIA Live

Stock

20

Min.Order

2500

Distributor reported inventory date: 2022-05-04

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SO-8

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

Country of Origin

CHINA

L6981NDR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

Distributor availability ofL6981NDR

Distributor Name
Region Stock Min. Order Third party link
ANGLIA Live EUROPE 2500 2500 Buy from Distributor

Distributor reported inventory date: 2022-05-02

Distributor Name

ANGLIA Live

Stock

2500

Min.Order

2500

Distributor reported inventory date: 2022-05-02

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SO-8

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

Country of Origin

CHINA

(*) 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