Products Overview

A89331 Three-Phase Sensorless Drivers

Allegro MicroSystems

A89331 : Three Phase Sinusoidal Sensorless Fan Controller

The A89332 three-phase sensorless fan controller helps reduce data-center costs. With power loss brake function, the A89332 gate driver IC can reduce energy consumption by stopping fans that have lost power or are not working properly.
The A89332 is available in a 26-contact 4 mm x 4 mm QFN with exposed pad (suffix EX).
The A89331 three-phase motor driver with integrated MOSFETs offers sensorless control, eliminating the requirement for Hall sensors in server fan applications. The A89331 incorporates a sensorless sinusoidal driver to minimize vibration for high-speed server fans.
The A89331 is available in a 28-contact 5 mm x 5 mm QFN with an exposed power pad (suffix ET) and a 20-contact TSSOP with an exposed power pad (suffix LP).
As the leading code-free solution for data-center cooling fans, these drivers are integrated with a flexible closed-loop speed control system. An EEPROM is used to tailor the common functions of the fan speed curve to a specific application. This eliminates the requirement for a microprocessor-based system and minimizes programming requirements.

Product Number: A89331

Class: Fan, Motor Controllers, Drivers, BLDC Drivers, Fan Drivers

Tag: BLDC Drivers, Three-Phase Sensorless Drivers, Motor, Motion, Ignition Controllers & Drivers

Closed Loop Speed Control
Overvoltage Protection
Power Loss Brake – A89331, A89332
AC Loss – A89331-1, A89332-1
High Maximum Voltage (36 V) – A89332, A89332-1
Sized for 1U and 2U Fans

Featured Applications :
Server and Data-center Cooling Fans

Part Number Type Output Current Technology Mounting Style Number of Outputs Moisture Sensitive Applications Output Voltage Operating Temperature Voltage - Supply Package Type
A89331 3 Phase 3A NMOS SMD/SMT 3 Outputs Yes Fan Controller 6.8 V, 7.5 V -40 °C ~ 105 °C(TA) 5.5V ~ 50V 26-contact QFN with exposed thermal pad (suffix EX),
28-contact QFN with exposed thermal pad (suffix ET)

See more...Allegro

  • See below for downloadable documentation, software, and other resources.

    Datasheet Download on Jun, 2022

Main Products

Allegro Micro Systems