Quality Standards and Environmental Certifications

A89331, A89331-1, A89332, A89332-1: Three-Phase Sensorless Drivers

NEW: The A89332 and A89332-1 enable faster, high speed 1U fans all in a smaller, compact footprint.

Allegro-28-contact-QFN-ET-and-20-lead-TSSOP-LP-packages

Please contact us for the full datasheets of the A89331, A89331-1, A89332 and A89332-1.

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Description & Top Features
Availability
Packaging
Design Support Tools

Description

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.

Top Features

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 Specifications and Availability

Part Number	Package Type	Temperature	RoHS Compliant	Part Composition / RoHS Data	Comments	Samples	Check Stock
A89331GETSR	28-lead QFN	-40°C to 105°C	Yes	View Data		Contact your local sales rep	Check Distributor Stock
A89331GETSR-1	28-lead QFN	-40°C to 105°C	Yes	View Data		Contact your local sales rep	Check Distributor Stock
A89331GLPTR-T	20-lead TSSOP	-40°C to 105°C	Yes	View Data		Contact your local sales rep	Check Distributor Stock
A89332GEX	26-lead QFN	-40°C to 105°C	--	View Data	New	Contact your local sales rep	Check Distributor Stock

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.