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US891EVK Datasheet(PDF) 1 Page - Melexis Microelectronic Systems |
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US891EVK Datasheet(HTML) 1 Page - Melexis Microelectronic Systems |
1 / 12 page US890 / US891 Two-Coil Fan Driver – High Output Current 3901000890 Page 1 of 12 Data Sheet Rev 002 Sep/07 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 tachometer (US890) or alarm (US891) signal protected output Low cost 2-coil fan driver with FG/RD output in RoHS Compliant 4-pin VK package Application Examples 5V/12V DC brushless motor/fan PC, server, laptop cooling fan Power supply cooling fan Large and small fan size Ordering Information Part No. Temperature Code Package Code US890 E (-40°C to 85°C) VK (4-pin TO-92) US891 E (-40°C to 85°C) VK (4-pin TO-92) 1 Functional Diagram 2 General Description The US890/891 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. Frequency Generator or Rotation Detection is available. The 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. |
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