MAX6660 19-2225 Rev 1 5/06 Remote-Junction Temperature-Controlled Fan-Speed Regulator with SMBus Interface General Description Features Integrated Thermal Sensing and Fan-Regulation The MAX6660 is a remote temperature sensor and fan- Solution speed regulator that provides a complete fan-control solution. The remote temperature sensor is typically a Programmable Fan Threshold Temperature common-collector PNP, such as a substrate PNP of a Programmable Temperature Range for Full-Scale microprocessor, or a diode-connected transistor, typi- Fan Speed cally a low-cost, easily mounted 2N3904 NPN type or Accurate Closed-Loop Fan-Speed Regulation 2N3906 PNP type. On-Chip Power Device Drives Fans Rated The device also incorporates a closed-loop fan con- Up to 250mA troller that regulates fan speed with tachometer feed- Programmable Under/Overtemperature Alarms back. The MAX6660 compares temperature data to a fan threshold temperature and gain setting, both pro- SMBus 2-Wire Serial Interface with Timeout grammed over the SMBus by the user. The result is (Cannot Lock Up the SMBus) automatic fan control that is proportional to the remote- Supports SMBus Alert Response junction temperature. The temperature feedback loop ACPI Compatible, Including OVERT System can be broken at any time for system control over the Shutdown Function speed of the fan. 1C (+60C to +100C) Thermal-Sensing Accuracy Fan speed is voltage controlled as opposed to PWM MAX6660EVKIT Available controlled, greatly reducing acoustic noise and maxi- mizing fan reliability. An on-chip power device drives fans rated up to 250mA. Ordering Information Temperature data is updated every 0.25s and is read- able at any time over the SMBus interface. The PIN- PKG MAX6660 is accurate to 1C (max) when the remote PART TEMP RANGE PACKAGE CODE junction is between +60C to +100C. Data is formatted MAX6660AEE -40C to +125C 16 QSOP E16-5 as a 10-bit + sign word with 0.125C resolution. The MAX6660 is specified for -40C to +125C and is available in a 16-pin QSOP package. Typical Operating Circuit Applications +3V TO +5.5V PC 0.1F 50 Notebooks 10k Telecom Systems +12V EACH Industrial Control Systems Servers 5k VFAN V STBY CC Workstations FAN TACH IN CLOCK 1F SMBCLK MAX6660 FAN DATA SMBDATA DXP SMBus is a trademark of Intel Corp. INTERUPT ALERT 2200pF TO P DXN TO SYSTEM OVERT SHUTDOWN PENTIUM AGND Pin Configuration appears at end of data sheet. ADD0 ADD1 PGND 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.Remote-Junction Temperature-Controlled Fan-Speed Regulator with SMBus Interface ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND.) FAN Out Current ..............................................................500mA V , ADD0, ADD1, SMBDATA, ESD Protection (Human Body Model)................................2000V CC SMBCLK, ALERT, OVERT ...................................-0.3V to +6V Continuous Power Dissipation (T = +70C) A V , TACH IN, FAN .............................................-0.3V to +16V 16-Pin QSOP (derate 8.3mW/C above +70C)..........667mW FAN DXP, GAIN..................................................-0.3V to (V + 0.3V) Operating Temperature Range ........................ -40C to +125C CC DXN.............................................................................-0.3V to 1V Junction Temperature .....................................................+150C SMBDATA, ALERT, OVERT Current ...................-1mA to +50mA Storage Temperature Range .............................-65C to +150C DXN Current ......................................................................1mA Lead Temperature (soldering, 10s) .................................+300C 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 = +3V to +5.5V, V = +12V, T = -40C to +125C, unless otherwise specified. Typical values are at V = +3.3V and CC VFAN A CC T = +25C.) (Note 1) A PARAMETER SYMB O L CONDITIONS MIN TYP MAX UNITS ADC AND POWER SUPPLY V Supply Voltage V 3.0 5.5 V CC CC V Supply Voltage V 4.5 13.5 V FAN VFAN Operating Supply Current I Fan off 250 500 A CC Shutdown Supply Current I Shutdown 3 10 A SHDN 0.125 C Temperature Resolution 11 Bits T = +60C to +100C -1 +1 RJ T = +85C, A Temperature Error (Note 2) T C E T = +25C to +125C -3 +3 RJ V = +3.3V CC T = -40C to +125C -5 +5 RJ Internal Reference Frequency +25 -25 % Accuracy Temperature Conversion Time 0.25 s Conversion Rate Timing Error -25 +25 % Undervoltage Lockout Threshold V V falling 2.50 2.80 3.00 V UVLO CC Undervoltage Lockout Threshold V 90 mV HYST Hysteresis Power-On-Reset (POR) V rising 1.4 2.0 2.5 V CC Threshold (V ) CC POR Threshold Hysteresis 90 mV High level 80 100 120 Remote-Junction Source Current I A RJ Low level 8 10 12 DXN Source Voltage V 0.7 V DXN 2 MAX6660