ST6609 2A 36V 256-Microstep Ultra-Silent Two-Phase Stepper Motor Driver

ST6609 2A 36V 256-Microstep Ultra-Silent Two-Phase Stepper Motor Driver

ST6609

The ST6609 is an ultra-silent two-phase stepper motor driver IC with a built-in step driving mode of up to 256 microsteps, featuring ultra-low noise and low vibration. Operating over a wide 4.7~36V supply range, it delivers up to 2A RMS continuous current per phase and 4A peak current, with H-bridge on-resistance of 0.2Ω for each high-side and low-side MOSFET (VBB=24V). Controlled via a standard STEP/DIR interface with MS1/MS2 microstep selection, the chip integrates an automatic gain control (AGC) loop that automatically compensates torque for variable loads across a wide speed range, plus automatic power saving during motor hold (current reduced to 50%). Comprehensive protection includes over-temperature (156℃, 26℃ hysteresis), under-voltage, output short-circuit and over-current protection, with FLAG1 error indication and FLAG2 position output, a built-in 5V LDO and a charge pump. Housed in a QFN28 (5mm×5mm) package, the ST6609 is widely used in white goods, office machines, 3D printers, medical instruments and PTZ control applications.

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Specifications

Power Bus Supply Voltage VMOperating 4.7~36V; Abs. Max 40V
Coil Current SpecPer-phase RMS continuous 2A, peak 4A
H-bridge Rds(on) (per phase HS+LS)HS+LS each 0.2Ω (combined ~0.4Ω) @VBB=24V, Iout=0.5A, 25℃
PWM Chopping FrequencyChopping PWM kHz not published (driven by 12MHz CLK base)
Microstep CapabilityUp to 256 microstep (MS1/MS2 pins: 00=1/8, 01=1/2, 10=1/4, 11=1/16)
Current Decay ModeDecay mode not published (built-in constant-current chopping)
Control InterfaceSTEP/DIR interface, MS1/MS2 resolution, CLK (4~18MHz), ENABLE, HOLDEN
Current RegulationREF analog voltage sets current (0.5~2.5V, Irms=0.092×VREF/RSENSE); auto power-save to 50% on hold
Dead TimeDead time 100ns (fixed)
Quiescent/Sleep Current (Iq/Isleep)Operating IVBB typ 7.8mA/max 11mA (VBB=24V, CLK=12MHz); IO 300µA; auto power-save to 50% on hold
Protection FeaturesOTP(156℃,26℃ hyst), UVLO(VBB 4.2V/VREG 3.5V/VIO 2.5V), output short-circuit (VM/GND), OCP
Fault FeedbackFLAG1 error flag output, FLAG2 position output (pulse per 4 step angles)
Logic Interface LevelVIO logic 3.0~5.5V (VIL<0.3×VIO, VIH>0.7×VIO); built-in 5V VREG LDO
Operating Temperature-40~125℃ (industrial)
Special FeaturesAGC auto-gain torque compensation, silent low vibration, hold auto-power-save, charge pump, 5V LDO
PackageQFN28(5×5), e=0.50mm

Product details

Overview

The ST6609 is an ultra-silent two-phase stepper motor driver IC with a built-in step driving mode of up to 256 microsteps, featuring ultra-low noise and low vibration, ideally suited for high-precision control fields such as 3D printing, medical devices, office equipment and security monitoring. The chip operates over a wide 4.7~36V supply range, delivering up to 2A RMS current per phase and 4A peak current. It adopts a standard STEP/DIR interface, with MS1/MS2 selecting the step angle per STEP pulse; the built-in automatic gain control (AGC) loop compensates torque decay to keep torque constant over a wide speed range, and the device automatically enters power-saving mode about 400ms after the motor stops, reducing current to 50% of normal. The ST6609 provides comprehensive output protection including over-temperature, under-voltage, output short-circuit (to supply/ground) and over-current protection, plus FLAG1 error indication and FLAG2 position output, with a built-in 5V LDO and charge pump. Housed in a QFN28 (5mm×5mm) package, the ST6609 delivers an integrated stepper motor drive solution for high-precision motion control applications.

Features

  • Two-phase stepper motor driver, 2A RMS continuous / 4A peak current per phase
  • Wide supply voltage range 4.7~36V
  • STEP/DIR interface, up to 256 microsteps, MS1/MS2 selectable 1/2, 1/4, 1/8, 1/16 steps
  • Ultra-low motor noise, AGC automatic torque compensation over a wide speed range
  • Automatic power saving during motor hold (current reduced to 50%)
  • Current linearly set by REF voltage (Irms=0.092×VREF/RSENSE)
  • H-bridge on-resistance 0.2Ω (high/low side, VBB=24V, Iout=0.5A)
  • Comprehensive protection: OTP (156℃, 26℃ hysteresis), UVLO (VBB/VREG/VIO), output short-circuit, OCP
  • FLAG1 error indication output, FLAG2 position output (pulse per 4 step angles)
  • Built-in 5V LDO and charge pump, CLK 4~18MHz (internal clock ~12MHz)
  • QFN28 (5mm×5mm, e=0.50mm) package

Typical Applications

  • White goods
  • Office machines
  • 3D printers
  • Medical instruments
  • PTZ control
  • Security monitoring

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