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A4938 - 3-Phase Brushless DC Motor Pre-Driver

General Description

The A4938 is a complete 3-phase brushless DC (BLDC) motor pre-driver, supplying direct, high-current gate drive of an all N-channel power MOSFET 3-phase bridge.

Key Features

  • Drives 6 N-channel MOSFETs.
  • Synchronous rectification for low power dissipation.
  • Internal UVLO and thermal shutdown circuitry.
  • Hall element inputs.
  • PWM current limiting.
  • Dead time protection.
  • FG outputs.
  • Standby mode.
  • Lock detect protection.
  • Overvoltage protection.

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Other Datasheets by Allegro MicroSystems

Part Number Description
A4933 Automotive 3-Phase MOSFET Driver
A4935 Automotive 3-Phase MOSFET Driver
A4937 Automotive 3-Phase MOSFET Driver
A4939 Automotive Three Phase MOSFET Driver
A4900 High Voltage Three Phase Gate Driver

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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A4938 3-Phase Brushless DC Motor Pre-Driver FEATURES AND BENEFITS ▪ Drives 6 N-channel MOSFETs ▪ Synchronous rectification for low power dissipation ▪ Internal UVLO and thermal shutdown circuitry ▪ Hall element inputs ▪ PWM current limiting ▪ Dead time protection ▪ FG outputs ▪ Standby mode ▪ Lock detect protection ▪ Overvoltage protection PACKAGE: 28-contact QFN (ET package) Approximate Footprint DESCRIPTION The A4938 is a complete 3-phase brushless DC (BLDC) motor pre-driver, supplying direct, high-current gate drive of an all N-channel power MOSFET 3-phase bridge. The device has three Hall-element inputs, a sequencer for commutation control, fixed off-time pulse width modulation (PWM) current control, and locked-rotor detection.