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US91A - 24V Hall IC Fan Driver

Download the US91A datasheet PDF. This datasheet also covers the US90A variant, as both devices belong to the same 24v hall ic fan driver family and are provided as variant models within a single manufacturer datasheet.

General Description

The US90A/91A is a one-chip solution for driving two-coil brushless DC cooling fans.

Based on the advanced Melexis CMOS process, the IC contains a Hall-effect sensor, dynamic offset correction and low side output drivers.

Frequency Generator or Rotation Detection is available.

Key Features

  • Low cost High sensitivity Hall Sensor Locked rotor protection and auto-restart Power-efficient CMOS and power MOSFETs Built-in output protection clamping diode Integrated tachometer (US90A) or alarm (US91A) signal output 2-coil fan driver with FG/RD output in 4-pin VK / VA and 8-pin narrow SOIC packages (all RoHS Compliant).

📥 Download Datasheet

Note: The manufacturer provides a single datasheet file (US90A_MelexisMicroelectronicSystems.pdf) that lists specifications for multiple related part numbers.

Datasheet Details

Part number US91A
Manufacturer Melexis
File Size 335.99 KB
Description 24V Hall IC Fan Driver
Datasheet download datasheet US91A Datasheet

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Other Datasheets by Melexis

Part Number Description
US90A 24V Hall IC Fan 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.

View original datasheet text
US90A / US91A 24V Hall IC Fan Driver Features and Benefits Low cost High sensitivity Hall Sensor Locked rotor protection and auto-restart Power-efficient CMOS and power MOSFETs Built-in output protection clamping diode Integrated tachometer (US90A) or alarm (US91A) signal output 2-coil fan driver with FG/RD output in 4-pin VK / VA and 8-pin narrow SOIC packages (all RoHS Compliant) Application Examples 12V/24V fans Peak current up to 500mA Ordering Information www.DataSheet4U.com Part No.