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STEVAL-L3751V12

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75 V 15 A DC-DC converter buck regulator evaluation board with L3751 controller

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Product overview

Description

The 6 to 75 V wide input voltage range STEVAL-L3751V12 synchronous buck evaluation board features an extreme voltage conversion ratio over switching frequency.

The board provides a regulated 5 V output at 230 kHz switching frequency. The output voltage can be easily set to 12 V using a jumper connector. Different voltage output can be selected by changing a resistor to a lower VIN range.

The STEVAL-L3751V12 is a 100 W demo board. The default maximum current is set to 15 A. It can be easily selected by changing a resistor.

The evaluation board is based on the L3751 synchronous buck controller, which implements the voltage mode in a VQFN package.

The diode emulation (DEM) implements the pulse-skipping mode, which maximizes the efficiency at light-load with a controlled output voltage ripple.

The forced PWM (FPWM) over-the-load range makes the switching frequency constant and minimizes the output voltage ripple.

The power good open collector output validates the regulated output voltage for monitoring. It implements the output voltage sequencing for digital ICs during the power-up phase.

The embedded gate driver is designed for standard Vth MOSFET and minimizes the number of external components.

The embedded protections, such as the output overcurrent, the input voltage UVLO, the internal voltage monitoring, and the thermal shutdown at 150°C degrees, feature a controlled and safe operation for critical environments in telecom, networking, and industrial applications.

You can use the eDesignSuite software tool to configure the L3751 buck converter and satisfy the application requirements.

  • All features

    • 6 to 75 V wide input voltage range
    • Selectable two-output voltage level: 5 or 12 V
    • 230 kHz switching frequency setting
    • Low drop-out operation during line transient
    • Pulse skipping or forced PWM operation at light load
    • Synchronization from 185 to 345 kHz
    • Power good open collector output validates the VOUT
    • 7.5 V gate drivers for standard Vth MOSFETs
    • Constant current protection with hiccup mode
    • Current sensing on rds-on low-side
    • Improved line-transient response
    • Input voltage undervoltage lockout
    • Internal voltage monitoring
    • Thermal protection
    • Operating junction temperature range: -40 to 150°C
    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 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
• Check for consistency
• Design each individual node
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Thermal-electrical Simulators for Components

AC Switches Simulator

• Select ratings and application waveforms
• Get junction temperature and blocking voltage graphs
• Search and sort suitable devices
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Rectifier Diodes Simulator

• Select ratings and application waveforms
• Estimate power losses
• Search and sort suitable devices
Thermal-electrical Simulators for Components

STPOWER Studio

• Supports long mission profiles
• Provides power loss and temperature graphs
• Helps define heatsink thermal properties
Thermal-electrical Simulators for Components

Twister Sim

• Help select the right ViPOWER Automotive power device
• Supports load-compatibility, wiring harness optimization, fault condition impact and diagnostic analysis
• Supports various PCB configurations
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TVS Simulator

• Specify system ratings and surge waveform
• Search and sort suitable devices
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Estimate

• Build simple schematics and firmware inputs in minutes
• Quickly generate reliable estimates of battery life, system power consumption and bill of materials costs
Thermal-electrical Simulators for Components

PCB Thermal Simulator

• Thermal analysis of a PCB from Gerber files.
• Possibility to add heat sources, heat sinks, copper areas and thermal paths.
• Powerful server-side engine for rendering and simulation.
• Thermal results shown graphically via 2D table.
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Signal Conditioning Design Tool

Active Filters

• Handles multi-stage-designs and common topologies
• Returns circuit component values
• Provides gain, phase and group delay graphs
• Low Pass, High Pass and Band Pass
Signal Conditioning Design Tool

Comparators

• Handles most common configurations
• Returns circuit components values
• Provides I/O signal waveforms
• Inverting, Non Inverting, Window
Signal Conditioning Design Tool

Low side Current Sensing

• Returns circuit component values
• Provides current error graphs
Signal Conditioning Design Tool

High side Current Sensing

• Provides current error graphs.
• Help to select the right High side current sensing and shunt devices.
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NFC/RFID Calculators

NFC Inductance

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

UHF Link Budget

• Enter forward and reverse link characteristics
• The tool returns link budget estimate
NFC/RFID Calculators

NFC Tuning Circuit

• Enter antenna parameter and matching target
• Select the topology of the matching network
• The tool returns component values for the desired design targets

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Resource title
Version
Latest update

SIMPLIS models (1)

Resource title
Version
Latest update
STEVAL-L3751V12 SIMPLIS SCHEMATICS
2025.07 24 Jul 2025
24 Jul 2025
STEVAL-L3751V12 SIMPLIS SCHEMATICS 2025.07

MCSDK Board Description (1)

Resource title
Version
Latest update
STEVAL-L3751V12 GERBER
1.0 24 Aug 2022
24 Aug 2022
STEVAL-L3751V12 GERBER 1.0

Bill of Materials (1)

Resource title
Version
Latest update
STEVAL-L3751V12 BOM
3.0 25 Jan 2023
25 Jan 2023
STEVAL-L3751V12 BOM 3.0

Schematic Pack (1)

Resource title
Version
Latest update
STEVAL-L3751V12 SCHEMATIC
3.0 25 Jan 2023
25 Jan 2023
STEVAL-L3751V12 SCHEMATIC 3.0

Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade WEEE Compliant Longevity Commitment Longevity Starting Date Material Declaration**
STEVAL-L3751V12
Active
CARD Industrial Ecopack2 Yes - -

STEVAL-L3751V12

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.

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(*) 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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