AW8646 Dual H-Bridge Stepper Motor Driver

The AW8646 is a flexible microstepping stepper motor driver. It is designed to operate bipolar stepper motor with up to 1/32th step mode for mobile phones, tablets, and other automated equipment applications. The device can be controlled by simple STEP/DIR interface allowing easy interfacing to controller circuits. The output block of each H-bridge driver consists of N-channel and P-channel power MOSFETs configured as full H-bridges to drive the motor windings. Pins allow configuration of the motor in full-step up to 1/32th step modes. Decay mode is configurable so that adaptive decay, slow decay, fast decay, and mixed decay can be used. A low power sleep mode is provided to achieve a very-low quiescent current draw. AW8646 is capable of driving up to 1.4A (Full Scale) or 1A (RMS) current per H-Bridge The device offers a complete set of protection features including UVLO, overcurrent protection, short circuit protection, and over temperature. Fault conditions are indicated via the nFAULT pin.


l  3V to 12V Supply Voltage Range

l  1.4A Full Scale current per H-Bridge

l  Rdson HS + LS: Typical 0.8Ω

l  Support up to 1/32th Microstepping

l  Decay Modes supported:

n  Adaptive Decay Technology

n  Mixed Decay

n  Slow Decay

n  Fast Decay

l  Support 1.8V Logic Level

l  Programmable off-time

l  10,20, or 30μs off-time

l  Programmable Motor Torque Current

l  Short-Circuit Protection, Over-Temperature

l  Protection, Under-Voltage Protection

l  Fault Condition Indication

l  QFN 4mm X4mm X0.85mm-24L package


Application note

Product name Type Size Download
  • Motor Type
    Micro Step
    Decay Mode
    In/Output Voltage(V)
    IO Logic (V)
    Max Output current(A)
    Istandby (typ.) (μΑ)
    Toff (us)
    Package (mm)
  • AW8646QNR

    Step Motor
    Adaptive Tune
    WBQFN 4X4-24L
Package form Number of pins Long(mm) Width(mm) Thick(mm) Pin spacing(mm) Heat sink Package drawing
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