MP6540A 5.5-35V, 3A Three-Phase Power Stage QFN-26

MP6540A 5.5-35V, 3A Three-Phase Power Stage QFN-26

The MP6540 and MP6540A are 3-phase, brushless DC motor drivers that integrate three half-bridges consisting of six N-channel power MOSFETs, pre-drivers, gate drive power supplies, and current sense amplifiers.

Key Specifications

Features

• 5.5V to 35V Operating Supply Voltage
• Three Integrated Half-Bridge Drivers
• 3A Output Current, 10A Peak Current
• MOSFET On Resistance: HS + LS 50mΩ
• MP6540: PWM and Enable Inputs MP6540A: HS and LS Inputs
• Internal Charge Pump Supports 100% Duty Cycle Operation
• Automatic Synchronous Rectification
• UVLO and Thermal Shutdown Protection
• Over-Current Protection (OCP)
• Integrated Bidirectional Current Sense Amplifiers

Typical Application Circuit

Applications

• Brushless DC Motors

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