3-Phase MOSFET Gate Driver That Maximises Battery Life

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The fully integrated device simplifies design of high-performance brushless DC motor drives and improves efficiency by 30 percent

Here’s introducing the fully integrated TMC6140-LA 3-phase MOSFET gate driver known as TMC6140-LA by TRINAMIC Motion Control GmbH & Co. KG (now part of Maxim Integrated Products, Inc.). The product reduces component count by half to simplify design and maximises the battery life of brushless direct current (DC) motor drives. By integrating all three bottom shunt amplifiers, the MOSFET gate driver provides a complete motor drive solution with 30-per cent improved power efficiency. The TMC6140-LA is optimised for performance over a wide voltage range, making it well-suited for servo motors, brushless motors and permanent magnet synchronous motors. 

The three-phase gate driver is equipped with pins to add a charge pump, statically stabilising the gate voltages of external MOSFETs in three-phase motors with up to 100A of coil current. Offered in a 36-pin quad-flat no-leads (QFN) package, the gate driver is a flexible solution that offers 0.5A or 1.0A gate driver current for 5V to 30V DC battery-powered applications, such as power tools where voltages can drop below 10V. Integrated current sense and diagnostics features add functional safety while simplifying design.

Key Advantages

  • Simple Design and Small Size: The TMC6140-LA integrates three bottom shunt amplifiers for current sense and diagnostics, as well as a switching regulator, simplifying design and reducing the component count by 50 per cent compared to similar solutions.
  • Longer Battery Life: For applications at 15V or lower, the switching regulator output stabilises the power supply, which maintains the output signals to ensure consistent operation over extended battery life.
  • Enhanced Diagnostics: Integrated shunt amplifiers provide current sensing for status information. An analogue programmable short detection and diagnostic output reports status back to the host.

“The integrated current sense and diagnostics features are key for enabling functional safety without adding complicated circuitry or additional components to any system’s design,” said Michael Randt, founder of Trinamic Motion Control. “This allows engineers to increase efficiency by 30 per cent with minimal effort.”

The TMC6140-LA MOSFET gate driver, TMC6140-EVAL evaluation board and TMC6140-EVAL-KIT evaluation kit with both bridge and driver evaluation boards are now available from Trinamic authorised distributors.


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