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STEVAL-L6981CDR

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

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Product overview

Description

The STEVAL-L6981CDR evaluation board is based on the L6981CDR synchronous monolithic step-down regulator capable of delivering up to 1.5 A DC.

Its wide input voltage range makes the device suitable for a broad range of applications.

The device implements peak current mode architecture in an SO 8L package with internal compensation to minimize design complexity and size.

The L6981 is available in low consumption mode (LCM) and low noise mode (LNM) versions.

LCM maximizes efficiency at light load with controlled output voltage ripple, making the device extremely suitable for battery-powered applications.

LNM makes the switching frequency constant and minimizes the output voltage ripple overload current range, meeting the specification for noise sensitive applications.

The EN pin manages the enable/disable function. The typical shutdown current is 2 μA when disabled. When 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 effective constant current protection while 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
    • Low consumption mode version for high efficiency at light loads
    • 2 μA shutdown current
    • Internal soft-start
    • Enable function
    • Overvoltage protection
    • Output voltage sequencing
    • Thermal protection
    • SO-8 package
    • Synchronization with external clock for LNM devices
    Read more Read less

eDesignSuite

eDesignSuite is a comprehensive set of easy-to-use design-aid utilities ready to help you streamline the system development process with a wide range of ST products.

Power Management Design Center

Thermal-electrical Simulators for Components

Signal Conditioning Design Tool

NFC/RFID Calculators

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Power Management Design Center

Power Supply Design Tool

• SMPS design, by topology, by type and by product
• PFC design with analog and digitial control
• Supports various PCB configurations
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DC/DC
AC/DC
Solar Battery Charger
Power Management Design Center

LED Lighting Design Tool

• Handles AC-DC and DC-DC design in common topologies
• Displays interactive and annotated schematic
• Provides current/voltage graphs, Bode plots, efficiency curves and power-loss data
Choose type:
DC/DC
AC/DC
Power Management Design Center

Digital Power Workbench

• Provides a step-by-step optimized design of power section and control loop
• Generates the STM32Cube embedded software package for custom applications and allows firmware project generation, compatible with multiple STM32 IDEs
Power Management Design Center

Power Tree Designer

• Specify input/output power for each node in the tree
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Thermal-electrical Simulators for Components

AC Switches Simulator

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Rectifier Diodes Simulator

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Thermal-electrical Simulators for Components

STPOWER Studio

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Thermal-electrical Simulators for Components

Twister Sim

• Help select the right ViPOWER Automotive power device
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Thermal-electrical Simulators for Components

TVS Simulator

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Thermal-electrical Simulators for Components

Estimate

• Build simple schematics and firmware inputs in minutes
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Thermal-electrical Simulators for Components

PCB Thermal Simulator

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Signal Conditioning Design Tool

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Signal Conditioning Design Tool

Comparators

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Signal Conditioning Design Tool

Low side Current Sensing

• Returns circuit component values
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Signal Conditioning Design Tool

High side Current Sensing

• Provides current error graphs.
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NFC/RFID Calculators

NFC Inductance

• Input geometry and substrate properties
• Get antenna impedance
NFC/RFID Calculators

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• The tool returns link budget estimate
NFC/RFID Calculators

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All resources

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Resource title
Version
Latest update

SIMPLIS models (1)

Resource title
Version
Latest update
STEVAL-L6981CDR SIMPLIS SCHEMATICS
2025.07 24 Jul 2025
24 Jul 2025
STEVAL-L6981CDR SIMPLIS SCHEMATICS 2025.07

MCSDK Board Description (1)

Resource title
Version
Latest update
STEVAL-L6981CDR GERBER
1.0 18 Feb 2021
18 Feb 2021
STEVAL-L6981CDR GERBER 1.0

Bill of Materials (1)

Resource title
Version
Latest update
STEVAL-L6981CDR BOM
1.0 18 Feb 2021
18 Feb 2021
STEVAL-L6981CDR BOM 1.0

Schematic Pack (1)

Resource title
Version
Latest update
STEVAL-L6981CDR SCHEMATIC
1.0 18 Feb 2021
18 Feb 2021
STEVAL-L6981CDR SCHEMATIC 1.0

Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade WEEE Compliant Longevity Commitment Longevity Starting Date Material Declaration**
STEVAL-L6981CDR
Active
CARD Industrial Ecopack2 Yes - -

STEVAL-L6981CDR

Package:

CARD

Material Declaration**:

More Info

Marketing Status

Active

Package

CARD

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.

Sample & Buy

(*) 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

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