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  3. Monolithic Power Systems — MP6636 Three-Phase Sensorless Brushless DC (BLDC) Motor Driver

Monolithic Power Systems — MP6636 Three-Phase Sensorless Brushless DC (BLDC) Motor Driver

 

Monolithic Power Systems

Monolithic Power Systems MP6636 Three-Phase Sensorless Brushless DC (BLDC) Motor Driver

Efficient Sensorless Motor Control with Integrated MOSFETs and Advanced Protection

The MP6636 from Monolithic Power Systems is a compact three-phase, sensorless BLDC motor driver designed for applications that require efficient operation, smooth motion, and low acoustic noise. With integrated power MOSFETs and support for sensorless field-oriented control (FOC), the device enables precise motor management while maintaining a streamlined design footprint.

The driver supports an input voltage range of 3.3 V to 18 V and delivers up to 2 A of continuous operating current. Motor speed can be regulated using either a DC input or a PWM signal from 50 Hz to 50 kHz, offering flexibility for a wide variety of system architectures. The device also provides rotational speed monitoring through an open-drain FG output.

To maximize reliability, the MP6636 incorporates multiple built-in protection functions, including over-voltage protection, under-voltage lockout, locked-rotor protection, phase-loss detection, over-current protection, and thermal shutdown. These features help ensure stable operation even under demanding conditions.

The MP6636 is offered in two space-saving package options, SOIC-8EP and TQFN-10 (4 mm x 4 mm), making it suitable for compact motor-control designs.

Features

  • 3.3 V to 18 V input voltage range
  • Supports up to 2 A of continuous current
  • Sensorless field-oriented control (FOC)
  • Integrated 190 mΩ high-side and low-side MOSFETs
  • Speed control via 0.3 V to 3.15 V DC input or 50 Hz to 50 kHz PWM input
  • Configurable starting duty cycle with hysteresis
  • Curve configuration options
  • Selectable open-loop or closed-loop speed modes
  • Adjustable soft acceleration and alignment time
  • Direction control capability
  • Power-save mode
  • 24 kHz PWM output frequency
  • Configurable current limit up to 4 A
  • Short-circuit protection
  • Over-voltage protection
  • Phase-loss protection
  • Over-temperature protection
  • Locked-rotor protection
  • Selectable FG and RD outputs
  • Available in SOIC-8EP and TQFN-10 (4 mm × 4 mm) packages

Applications

  • General Three-Phase BLDC Fans
  • BLDC Motors

Markets

  • Server/Telecom Fans
  • High-Current Cooling Fans

Typical Application

Typical Application Circuit

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Monolithic Power Systems MP6636 BLDC Motor Driver


Monolithic Power Systems MP6636 BLDC Motor Driver

Evaluation Board

EV6636-N-00A

The EV6636-N-00A is an evaluation board designed to demonstrate the capabilities of the MP6636GN, which is the SOIC-8EP package version of the MP6636. The MP6636 is a three-phase sensorless brushless DC (BLDC) motor driver with integrated power MOSFETs. It features sensorless field-oriented control (FOC) for improved efficiency and low vibration, with up to 2A of operating current. The input voltage (VIN) ranges from 3.3V to 18V.

EV6636-N-00A
Evaluation Board for MP6636