Diodes Incorporated
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ZXBM2004 (Not Recommended for new design)

NRND = Not Recommended for New Design

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The ZXBM2004 is a 2-phase, Brushless Direct Current (BLDC) motor control pre-driver with variable PWM speed control suitable for fan and blower motors. For system flexibility, motor speed can be control°C by changing SPD pin voltage which can be either from Thermistor network, external voltage or PWM signal. To help protect the motor coil, the ZXBM2004 provides Rotor Lock Protection which shuts down the output drive if rotor lock is detected. The device automatically re-starts when the rotor lock is removed. A Tachometer output is provided by open-drain Frequency Generator (FG) Pin which allows external interface to monitor motor rotation or speed. The FG output is the magnetic change frequency.


  • Supports two-phase BLDC motor control
  • Operating voltage: 4.7V to 18V - Can be extended with external regulator
  • PWM speed control via external Thermister, DC voltage or PWM signals
  • Reference voltage output
  • Built-in Hall amplifier allows direct connection of Hall element
  • Rotor Lock Protection (Lock detection, output shutdown and automatic re-start)
  • Rotor lock detect (RD) output
  • Minimum speed setting
  • Frequency generator (FG) output for speed measurements
  • Low noise
  • Space saving low profile U-QFN3030-16 and QSOP-16 packages
  • “Green” Molding Compound


  • Desktop PC and Servers fans and blowers
  • Instrumentation fans
  • Central heating blowers
  • Automotive instrument cooling and climate control
  • Extractor fans
  • General motors and pumps

Product Specifications

Product Parameters

Frequency Generator (FG) and Rotation Detect RD
Lock Detect, Shut-Down and Auto Start Yes
Low Side Switch Drive Sink Current -
Low Side Switch Drive Source Current (mA) 80
Minimum Speed Setting Yes
Operating Ambient Temperature (°C) -40 to 85
Operating Voltage (V) 4.5 to 18
Reference Voltage Output (V) -
Speed Control VSPD or VDD
SupplyCurrent (mA) -

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