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Three-Phase MOSFET Driver

A4915

Allegro-28-terminal-QFN-ET-and-28-pin-TSSOP-LP-packages


A4915 ECAD Model
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Description

Top Features

Packaging

The A4915 is a three-phase MOSFET driver capable of high current gate drive for 6 all N-channel power MOSFETs. An internal charge pump ensures gate drive down to 7 V supply and provides limited gate drive down to 5 V. The device improves time to market by eliminating complicated software development which saves overall system costs for customers.

A bootstrap capacitor is used to generate a supply voltage greater than the source voltage of the high side MOSFET, required for N-channel MOSFETs.

Internal synchronous rectification control circuitry is provided to improve power dissipation in the external MOSFETs during PWM operation. Internal circuit protection includes latched thermal shutdown, dead time protection, and undervoltage lockout. Special power up sequencing is not required. 

Allegro recommended hall latches: APS13290-1.

The A4915 is supplied in a 28-pin TSSOP with an exposed thermal pad (suffix LP) and a 28-contact 5 × 5 mm QFN with an exposed thermal pad (suffix ET). These packages are lead (Pb) free, with 100% matte tin leadframe plating.

  • 5 to 50 V supply voltage
  • Latched TSD with fault output
  • Drives six N-channel high current MOSFETs
  • Internally controlled synchronous rectification
  • Speed voltage input enables internal PWM duty cycle control of full bridge
  • Center aligned PWM
  • Internal UVLO and crossover current protection
  • Hall switch inputs
  • Adjustable dead time protection
  • Low power sleep mode for battery-powered applications

28-pin TSSOP with exposed thermal pad (LP package)

LP Package Documentation

 

28-contact QFN 5 mm x 5 mm x 0.90 mm (ET package)

ET Package Documentation

 

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Part Number Specifications and Availability

A4915 Product Overview

The Allegro A4915 Three-Phase MOSFET Driver’s innovative speed input and fully integrated block commutation delivers simple speed control of a BLDC motor with a single analog voltage. Watch video to learn more. 

Documentation and Resources

Documentation

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All Types Guide Technical Article Video
Documents Found: 32
Document Type Document Name
Guide
A4915MET Evaluation Board User Guide
Technical Article
Hall-Based BLDC Gate Drive Saves Microprocessor IO and Provides Zero Speed Torque
Video
A4915 Demo Board Video