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MP6602 Stepper Motor Driver

35V Stepper Motor Driver with Stall Detection and Serial Interface

The MP6602 is a stepper motor driver with a built-in indexer/translator and internal current regulation. The internal current sense means that the MP6602 does not require external current-sense resistors. The MP6602 operates across a 4.5V to 35V input voltage (VIN) range. It can deliver a motor current of up to 4A per phase, depending on the ambient temperature and PCB layout. The MP6602 can operate a bipolar or unipolar stepper motor in full, half-, quarter-, eighth-, 1/16-, and 1/32-step modes.

Internal safety and diagnostic features include rotor stall detection, open-load detection, over-current protection (OCP), input over-voltage protection (OVP), under-voltage protection (UVP), thermal warning, ad thermal shutdown.

The automatic hold current mode can lower the winding current to automatically save power when a full current is not required, such as when the motor is stopped or lightly loaded.

The motor’s back EMF (BEMF) can be measured. The BEMF can be read via the serial interface for advanced diagnostic and control functions. The serial interface sets control modes such as the step mode, direction, and output current. The serial interface can also read diagnostic registers. The STEP and DIR input pins can adjust motor motion without serial bus transactions.

The MP6602 is a highly integrated solution for stepper motor driving. It is available in a small QFN-25 (4mmx5mm) package.

Features

4.5V to 35V Operating Input Voltage (VIN) with 40V Absolute Maximum
Two Internal Full-Bridge Drivers
Supports Unipolar Motor
Up to 1/32-Step Microstepping
Internal Current-Sensing and Regulation
Low On Resistance:

60mΩ High-Side MOSFET (HS-FET)
30mΩ Low-Side MOSFET (LS-FET)

Serial Control Interface
Enable and Step Input Pins
3.3V and 5V Compatible Logic Supply
4A Maximum Output Current (IOUT)
Automatic Hold Current
Automatic Current Decay
Diagnostic Functions, Including:

Rotor Stall Detection
Back EMF Measurement
Over-Current Protection (OCP)
Open-Load Detection
Over-Voltage Protection (OVP)
Under-Voltage Protection (UVP)
Thermal Warning and Shutdown
Fault Indication Output
Available in a Space-Saving QFN-25 (4mmx5mm) Package