MP6603 8-55V Dual Full-Bridge Motor Driver QFN-25

MP6603 8-55V Dual Full-Bridge Motor Driver QFN-25

The MP6603 is a dual full-bridge motor driver with integrated low-on resistance (RDS(ON)) MOSFETs.

Key Specifications

Features

• Wide 8V to 55V Operating Input Voltage (VIN) Range
• Two Internal Full-Bridge Drivers
• Selectable Input Interface: Simple Pulse- Width Modulation (PWM) Input or Indexer Input)
• Indexer Interface Offers Full-, Half-, Quarter-, and Eighth-Step Modes by Setting the M1 and M2 Pins
• Low On Resistance (RDS(ON)): 65mΩ High- Side MOSFET (HS-FET) and 50mΩ Low- Side MOSFET (LS-FET)
• Up to 5A of Current in Full-Bridge Mode
• Up to 10A of Current in Parallel Mode
• PWM Operating Frequency Up to 100kHz
• Independent Ground Pins for Each Half- Bridge
• 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