MAX6650 Datasheet PDF - Maxim Integrated

General Description

●The MAX6650/MAX6651 fan controllers use an SMBus/I2C-compatible interface to regulate and monitor the speed of 5VDC/12VDC brushless fans with built in tachometers. They automatically force the fan’s tachometer frequency (fan speed) to match a preprogrammed value in the Fan-Speed Register by using an external MOSFET or bipolar transistor to linearly regulate the voltage across the fan. The MAX6650 regulates the speed of a single fan by monitoring its tachometer

●output. The MAX6651 also regulates the speed of a single fan, but it contains additional tachometer inputs to monitor up to four fans and control them as a single unit when they are used in parallel.

●Features

●♦Closed/Open-Loop Fan-Speed Control for 5V/12V Fans

●♦2-Wire SMBus/I2C-Compatible Interface

●♦Monitors Tachometer Output

●   Single Tachometer (MAX6650)

●  Up to Four Tachometers (MAX6651)

●♦Programmable Alert Output

●♦GPIOs

●♦Hardware Full-On Override

●♦Synchronize Multiple Fans

●♦Four Selectable Slave Addresses

●♦3V to 5.5V Supply Voltage

●♦Small Packages

●  10-Pin µMAX (MAX6650)

●  16-Pin QSOP (MAX6651)