• 简体中文
• English

MAX6670：Remote Temperature Switches with Integrated Fan Controller/Driver

The MAX6668/MAX6670 remote-junction thermal switches with an internal power transistor drive a cooling fan rated for supply voltages up to +12V and 250mA. These devices measure the temperature of an external P-N junction (typically a diode-connected transistor) and turn on the fan power switch when the remote temperature rises above a factory-programmed threshold. Self-contained and requiring no software development, the MAX6668/MAX6670 are simple “drop-in” fan-control solutions for a variety of systems. The MAX6670 features an open-drain active-low WARN output that goes active when the remote temperature exceeds the factory-programmed fan activation threshold by +15°C. The MAX6670 features an open-drain OT output that goes active when the remote temperature exceeds the factory-programmed threshold by +30°C. The MAX6668/MAX6670 provide a fan-control input, active-low FORCEON, that allows the fan to be driven externally, regardless of temperature. Available temperature thresholds range from +40°C to +75°C in 5°C increments. Hysteresis is preset to 8°C on the MAX6668 or pin selectable to 4°C, 8°C, or 12°C using a three-level logic input on the MAX6670. Temperature threshold accuracy is ±1°C (typ) and ±2.2°C (max) for remote-junction temperatures from +40°C to +75°C. The MAX6668/MAX6670 operate from a +3V to +3.6V power supply, and are specified over the automotive temperature range (-40°C to +125°C). The MAX6668 is offered in an 8-pin µMAX package and the MAX6670 is available in a space-saving 10-pin µMAX package.

Key Features +12V, 250mA Integrated Fan Driver No Calibration Required Pin-Selectable 4°C, 8°C, or 12°C Hysteresis (MAX6670) Factory-Programmed Temperature Thresholds from +40°C to +75°C Overtemperature Warning Signals 110µA (typ) Supply Current Space-Saving 8-Pin and 10-Pin µMAX Packages

MAX6668, MAX6670: Typical Operating Circuit Applications/Uses Card Racks Fan Control Laboratory Instruments Network Hubs, Switches, Routers Notebook and Desktop Computers PC Power Supplies Temperature Alarms

DataSheet

Parametrics

Ordering Information