MP6506 2.7-15V, 500mA Bipolar Stepper-Motor Driver QFN16

MP6506 2.7-15V, 500mA Bipolar Stepper-Motor Driver QFN16

The MP6506 is a bipolar stepper-motor driver with dual, built-in full-bridges consisting of N- channel power MOSFETs.

Key Specifications

Features

• Wide 2.7V-to-15V Input Voltage Range
• Two Internal Full-Bridge Drivers
• Low MOSFET On Resistance (HS: 500mΩ; LS: 500 mΩ)
• Internal Charge Pump for the High-Side Driver
• Low Quiescent Current: 1.1mA
• Low Sleep Current: 1μA
• Thermal Shutdown and Under-Voltage Lockout Protection
• Over-Temperature Output Flag
• Thermally-Enhanced Surface-Mount Package

Typical Application Circuit

Applications

• POS Printers
• Video Security Camera
• Digital Still Cameras

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