MP6543C 3-22V, 1.2A Three-Phase BLDC Motor Driver QFN-24

MP6543C 3-22V, 1.2A Three-Phase BLDC Motor Driver QFN-24

The MP6543C is a three-phase brushless DC (BLDC) motor driver with three integrated half- bridges, consisting of six N-channel power MOSFETs, as well as six pre-drivers, two gate driver power supplies, and three current-sense amplifiers.

Key Specifications

Features

• 3V to 22V Operating Input Voltage (VIN) Range
• Three Integrated Half-Bridge Drivers
• 1.2A Continuous Output Current (IOUT)
• 110mΩ RDS(ON) per MOSFET
• Enable (EN) Input and Pulse-Width Modulation (PWM) Input
• 3.3V, 100mA Built-In Low-Dropout (LDO) Regulator
• Internal Charge Pump for 100% Duty Cycle
• Automatic Synchronous Rectification
• Integrated Bidirectional Current-Sense Amplifiers
• Configurable Over-Current Protection (OCP)

Typical Application Circuit

Design Notes

• Set dead time to match the external FET turn-off, not the datasheet typical. Too little risks shoot-through, too much distorts the current waveform at low duty cycle.
• Use a Kelvin connection for the current-sense resistor; shared copper injects switching noise straight into the sense amplifier.
• The thermal pad is the only heat path for most packages — via-stitch it to a ground plane with at least 9 vias.
• PWM frequency trades switching loss against current ripple in the motor inductance; 20 kHz keeps the drive out of the audible band.
• Add a brake or coast path so regeneration during a fast stop does not pump the supply rail.

Common Questions