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MAX6620 - Quad Linear Fan-Speed Controller

General Description

The MAX6620 controls the speeds of up to four fans using four independent linear voltage outputs.

The drive voltages for the fans are controlled directly over the I2C interface.

Each output drives the base of an external bipolar transistor or the gate of a FET in highside drive configuration.

Key Features

  • o Controls Up to Four Independent Fans With Linear (DC) Drive o Uses Four External Low-Cost Pass Transistors o 1% Accuracy Precision RPM Control o Controlled Voltage Rate-Of-Change for Best Acoustics o I2C Bus Interface o 3.0V to 5.5V Supply Voltage Range o 250µA (typ) Operating Supply Current o 3µA (typ) Shutdown Supply Current o Small 5mm x 5mm Footprint Ordering Information PART TEMP RANGE MAX6620ATI+ -40°C to +125°C +Denotes a lead-free package.
  • EP = Exposed paddle. PIN-.

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EVALUATION KIT AVAILABLE MAX6620 Quad Linear Fan-Speed Controller General Description The MAX6620 controls the speeds of up to four fans using four independent linear voltage outputs. The drive voltages for the fans are controlled directly over the I2C interface. Each output drives the base of an external bipolar transistor or the gate of a FET in highside drive configuration. Voltage feedback at the fan’s power-supply terminal is used to force the correct output voltage. The MAX6620 offers two methods for fan control. In RPM mode, the MAX6620 monitors four fan tachometer logic outputs for precise (±1%) control of fan RPM and detection of fan failure. In DAC mode, each fan is driven with a voltage resolution of 9 bits and the tachometer outputs of the fans are monitored for failure.