MP6520 8-32V, 1.5A Stepper Motor Driver QFN-28

MP6520 8-32V, 1.5A Stepper Motor Driver QFN-28

The MP6520 is a stepper motor driver with a built-in microstepping translator.

Key Specifications

Features

• Wide 8V to 32V Input Voltage Range
• Two Internal Full-Bridge Drivers
• Low On Resistance (HS: 300mΩ; LS: 300mΩ)
• No Control Power Supply Required
• Simple Logic Interface
• Compatible with 3.3V and 5V Logic
• Full-, Half-, Quarter-, and Eighth-Step Functionality
• 1.5A Maximum Output Current
• Adjustable Mixed Decay Ratio
• Over-Current Protection (OCP)

Typical Application Circuit

Applications

• Bipolar Stepper 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