3-phase MOSFET gate driver maximizes battery life

August 17, 2021 // By Jean-Pierre Joosting
3-phase MOSFET gate driver maximizes battery life
Simplifies design of high-performance brushless DC motor drives and improves efficiency by 30 percent, while cutting component count by half

Based in Germany, TRINAMIC Motion Control, now part of Maxim Integrated Products, has introduced the fully integrated TMC6140-LA 3-phase MOSFET gate driver that simplifies design and maximizes battery life of brushless direct current (DC) motor drives. The TMC6140-LA 3-phase MOSFET gate driver integrates all three bottom shunt amplifiers to provide a complete motor drive with 30-percent improved power efficiency, while simplifying design by reducing component count by half when compared to similar solutions.

The TMC6140-LA is optimized 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 stabilizing the gate voltages of external MOSFETs in three-phase motors with up to 100 A of coil current. Offered in a 36-pin quad-flat no-leads (QFN) package, the gate driver is a flexible solution offering 0.5 A or 1.0 A gate driver current for 5-V to 30-V DC battery-powered applications, such as power tools where voltages can drop below 10 V. Integrated current sense and diagnostics features add functional safety while simplifying design.

The TMC6140-LA integrates three bottom shunt amplifiers for current sense and diagnostics, as well as a switching regulator, simplifying design and reducing component count by 50 percent.

For applications at 15V or lower, the switching regulator output can be used to stabilize the power supply, which maintains the output signals to ensure consistent operation over an extended battery life.

Integrated shunt amplifiers provide current sensing for status information. An analog programmable short detection and diagnostic output reports status back to the host.

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