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US891
Two-Coil Fan Driver - High Output Current (Alarm output)
Description
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US891 General Description
The US891 is a one-chip solution for driving two-coil brushless DC motors and fans.
Based on the advanced Melexis CMOS process, the IC contains a Hall-effect sensor, dynamic offset correction and powerful output drivers with 1200mA peak output current capability.
Specially designed for driving large fans, the device is optimized for low start-up voltage.
The Rotation Detection open-drain output makes easier the connectivity with any external interface such as hardware monitoring or Super I/O IC.
These features are combined with the Melexis patented no-VDD design to fit the IC in a small 4-pin VK package.
US891 Features and Benefits
Peak output current up to 1200mA
Low start-up voltage
Low output resistance
High sensitivity integrated Hall Sensor
Power-efficient CMOS and power MOSFETs
Built-in output protection clamping diode
Locked rotor protection and auto-restart
Integrated alarm signal protected output
Low cost
2-coil fan driver with RD output in
RoHS Compliant 4-pin VK package
US891 Applications
Application Note
File Type
Size
Revision
Date
Action
Melexis Two Coil Fan Driver - Power Dissipation
PDF
256.7 KB
001
10/31/2007
Trim and form recommendations
PDF
127.1 KB
3.11
4/13/2009
US891 Documentation
DataSheet
File Type
Size
Revision
Date
Action
US890/US891 DataSheet
PDF
312.8 KB
002
10/12/2007
Reference
File Type
Size
Revision
Date
Action
BLDC Fan Motor Driver Quick Reference
PDF
1.7 MB
004
10/4/2011
US891 Tools
US891 Environmental Information
Environmental Information
File Type
Size
Revision
Date
Action
Green / Halogen Free Compliance Declaration US891
PDF
39.7 KB
1.0
11/3/2009
Package Material Declaration - VK GR - S3
PDF
104.9 KB
7.0
3/21/2012
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US891 In The Press
US891 Frequently asked Questions
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