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MAX6665：Fan Controller/Driver with Factory-Programmed Temperature Thresholds

The MAX6665 is a fully integrated thermal switch with an internal power transistor for driving a cooling fan rated up to 24V and 250mA. When the MAX6665's temperature rises above a factory-programmed threshold, the active-low FANOUT pin becomes active and powers the fan. The MAX6665 is available with factory-programmed fan activation threshold temperatures from +40°C to +70°C in 5°C increments. Accuracy of the fan activation trip point is ±1°C (typ) and ±3°C (max). The trip point's hysteresis is pin selectable to 1°C, 4°C, or 8°C. Two open-drain logic outputs indicate overtemperature con- ditions: active-low WARN is activated when the temperature is 15°C above the fan activation threshold, and OT is activated when the temperature is 30°C above the threshold. These features can be used to safely power down systems that are overheated. The MAX6665 operates from a +2.7V to +5.5V power supply, and the associated fan can be powered from 4.5V to 24V. It is available in an 8-pin SO package and operates from -40°C to +125°C.

Key Features On-Chip 250mA Fan Switch No External Components Required Factory-Programmed Thresholds Two Overtemperature Warning Signals Pin-Selectable 1°C, 4°C, and 8°C Hysteresis Low 65µA Supply Current

MAX6665: Typical Operating Circuit Applications/Uses Card Racks Laboratory Instruments Notebook and Desktop Computers PC Power Supplies Servers

DataSheet

Parametrics

Quality and Environmental Data

• MAX6665.pdf

Ordering Information