MAX6665 19-2056 Rev 0 5/01 Fan Controller/Driver with Factory- Programmed Temperature Thresholds General Description Features The MAX6665 is a fully integrated thermal switch with On-Chip 250mA Fan Switch an internal power transistor for driving a cooling fan No External Components Required rated up to 24V and 250mA. When the MAX6665s tem- perature rises above a factory-programmed threshold, Factory-Programmed Thresholds the FANOUT pin becomes active and powers the fan. Two Overtemperature Warning Signals The MAX6665 is available with factory-programmed fan Pin-Selectable 1C, 4C, and 8C Hysteresis activation threshold temperatures from +40C to +70C in 5C increments. Accuracy of the fan activation trip Low 65A Supply Current point is 1C (typ) and 3C (max). The trip points hys- teresis is pin selectable to 1C, 4C, or 8C. Two open- drain logic outputs indicate overtemperature con- Ordering Information ditions: WARN is activated when the temperature is 15C above the fan activation threshold, and OT is acti- TEMP. PIN- vated when the temperature is 30C above the thresh- PART THRESHOLD RANGE PACKAGE old. These features can be used to safely power down systems that are overheated. -40C to MAX6665ASA40 8 SO-EP* 40C +125C The MAX6665 operates from a +2.7V to +5.5V power supply, and the associated fan can be powered from -40C to MAX6665ASA45 8 SO-EP* 45C 4.5V to 24V. It is available in an 8-pin SO package and +125C operates from -40C to +125C. -40C to MAX6665ASA50 8 SO-EP* 50C Applications +125C Notebook and Desktop Computers -40C to MAX6665ASA55 8 SO-EP* 55C +125C Servers -40C to PC Power Supplies MAX6665ASA60 8 SO-EP* 60C +125C Laboratory Instruments -40C to MAX6665ASA65 8 SO-EP* 65C Card Racks +125C -40C to MAX6665ASA70 8 SO-EP* 70C Typical Operating Circuit +125C *Exposed paddle +4.5V TO +24V 100mA TO 250mA COOLING FAN Pin Configuration TOP VIEW +3.3V V FANOUT DD V DD 1 F MAX6665 100k GND 1 8 FANOUT WARN HYST V DD FORCEON 2 7 V DD MAX6665 100k HYST 3 6 WARN OT FORCEON FANON 4 5 OT FANON GND SO Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.Fan Controller/Driver with Factory- Programmed Temperature Thresholds ABSOLUTE MAXIMUM RATINGS V to GND..............................................................-0.3V to +6V Continuous Power Dissipation (T = +70C) DD A FANOUT to GND ....................................................-0.3V to +28V 8-Pin SO (derate 19.6mW/C above +70C).............1568mW FORCEON, HYST, FANON to GND............-0.3V to (V + 0.3V) Operating Temperature Range .........................-40C to +125C DD WARN, OT to GND ...................................................-0.3V to +6V Junction (storage) Temperature Range ............-65C to +150C FANOUT Continuous Current............................................400mA Lead Temperature (soldering, 10s) .................................+300C All Other Pins....................................................................20mA Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (V = +2.7V to +5.5V, T = -40C to +125C. Typical values are at V = +3.3V and T = +25C, unless otherwise noted.) (Note 1) DD A DD A PARAMETER CONDITIONS MIN TYP MAX UNITS Supply Voltage V pin 2.7 5.5 V DD Supply Current No load 65 200 A FANOUT Drive Voltage FANOUT pin 26 V V < 0.8V 250 FANOUT FAN OUT Output C ur r ent Cap ab i l i ty mA V < 0.6V, T T +10C, V +3.3V 250 FANOUT A TH CC FANOUT Leakage Current V = 26V, T = +60C3 A FANOUT A MAX6665ASA40 40 MAX6665ASA45 45 MAX6665ASA50 50 FANOUT Threshold, T MAX6665ASA55 55 C TH MAX6665ASA60 60 MAX6665ASA65 65 MAX6665ASA70 70 FANOUT Threshold Error -3 1+3 C HYST is unconnected 1 FANOUT Hysteresis HYST 0.3V 4 C DD HYST 0.7V 8 DD WARN Threshold Relative to FANOUT temperature threshold +15 C OT Threshold Relative to FANOUT temperature threshold +30 C WARN and OT Hysteresis 2 C FANON Output High Voltage I = 0.5mA source 2.0 V FANON FANON Output Low Voltage I = 0.5mA sink 0.7 V FANON I = 1.2mA or I = 1.2mA sink 0.3 WARN OT W ARN and O T Output Vol tag e Low V I = 20mA or I = 20mA sink 0.5 WARN OT Open-Drain Leakage Current V = 5.5V or V = 5.5V 0.1 A WARN OT Input Low Voltage FORCEON and HYST pins 0.3V V DD Input High Voltage FORCEON and HYST pins 0.7V V DD FORCEON connected to V or GND -1 +1 DD Input Current A HYST connected to V or GND -15 +15 DD Note 1: Specifications over temperature are guaranteed by design. Parts are 100% production tested at 10C below the tempera- ture threshold. 2 MAX6665