MAXIM MAX6620 Manual
Update: 30 September, 2023
The MAX6620 is a four-channel linear voltage output driver for controlling fans. It directly controls the fan drive voltages via the I2C interface. Each output drives the base of an external bipolar transistor or the gate of a FET in high-side drive configuration. Voltage feedback at the fan’s power-supply terminal is used to force the correct out- put 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 dri- ven with a voltage resolution of 9 bits and the tachome- ter outputs of the fans are monitored for failure. The DAC_START input selects the fan power-supply voltage at startup to ensure appropriate fan drive when power is first applied. A watchdog feature turns the fans fully on to protect the system if there are no valid I2C communications within a preset timeout period. The MAX6620 operates from a 3.0V to 5.5V power sup- ply with low 250µA supply current, and the I2C-compati- ble interface makes it ideal for fan control in a wide range of cooling applications. The MAX6620 is avail- able in a 28-pin TQFN package and operates over the -40°C to +125°C automotive temperature range.
Brand: MAXIM
File format: PDF
Size: 356 KB
MD5 Checksum: D2E39A874811AFDC52C080A7F51095D5
Publication date: 09 April, 2012
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PDF Link: MAXIM MAX6620 Manual PDF