MAX6670 Datasheet | Maxim Integrated

Description The MAX6668/MAX6670 remote-junction thermal switches with an internal power transistor drive a cooling fan rated for supply voltages up to +12V and 250m A. 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 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, 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. o +12V, 250m A Integrated Fan Driver o No Calibration Required o Pin-Selectable 4°C, 8°C, or 12°C Hysteresis (MAX6670) o Factory-Programmed Temperature Thresholds from +40°C to +75°C o Overtemperature Warning Signals o 110µA (typ) Supply Current o Space-Saving 8-Pin and 10-Pin µMAX Packages Features MAX6668/MAX6670 Ordering Information PART TEMP RANGE PI NPA CK AG E 8 µMAX 8 µMAX 8 µMAX 8 µMAX 8 µMAX 8 µMAX THRESHOLD ( ° C) 40 45 50 60 70 75 MAX6668AUA40 -40°C...