(US90A / US91A) 24V Hall IC Fan Driver
US90A / US91A
24V Hall IC Fan Driver Features and Benefits
Low cost High sensitivity Hall Sensor Locked rotor protection...
Description
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
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Part No. US90A US90A US90A US91A US91A US91A
Temperature Code E (-40° C to 85° C) E (-40° C to 85° C) E (-40° C to 85° C) E (-40° C to 85° C) E (-40° C to 85° C) E (-40° C to 85° C)
Package Code VK (4-pin TO-92) DC (8-pin narrow SOIC) VA (4-pin TO-92 flat) VK (4-pin TO-92) DC (8-pin narrow SOIC) VA (4-pin TO-92 flat)
1 Functional Diagram
2 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. The open-drain output makes the connectivity with any external interface such as hardware monitoring or Super I/O IC easier. These features are combined with the Melexis patented no-VDD design to fit the IC in small 4-pin VK and VA package. The device is also delivered in DC package for automatic assembly.
390109026302 Rev 002
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Data Sheet Apr/07
US90...
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