19-2477; Rev 3; 12/10 Low-Voltage Analog Temperature Sensor in an SC70 Package The MAX6613 is a low-power precision analog output temperature sensor in a tiny 5-pin SC70 package. The MAX6613 operates over a 1.8V to 5.5V supply voltage range, with a typical current consumption of only 7.5µA. It is particularly well suited for portable applications where minimizing battery cost and maximizing useful battery life are crucial. The MAX6613 provides an analog voltage output proportional to temperature. Accuracy is ±4.0°C (max) over a range of TA = 0°C to +50°C and ±4.4°C (max) from TA = -20°C to +80°C. Self-heating effects are negligible due to the low current consumption of the part. Unlike many analog temperature sensors, the MAX6613 is stable with any capacitive load from 0pF to 1000pF, providing broad flexibility in board-level design. The operating temperature range varies with the voltage supply. The MAX6613 can be used over a -55°C to +130°C range with a 2.5V to 5.5V supply voltage. For applications with a supply voltage of 1.8V, the MAX6613 can be used over a +25°C to +130°C temperature range. Applications Cellular Phones Disk Drives GPS Equipment Printers Medical Instruments Fax Machines Battery Management HVAC Features ♦ 1.8V to 5.5V Supply Voltage ♦ 4.0°C Accuracy ♦ Low Supply Consumption, 7.5µA (typ) ♦ -55°C to +130°C Temperature Range ♦ SC70 Package ♦ Pin Compatible to LM20 Ordering Information PART PINPACKAGE TEMP RANGE MAX6613MXK+T TOP MARK -55°C to +130°C 5 SC70-5 ADJ MAX6613MXK/V+T -55°C to +130°C 5 SC70-5 ADJ +Denotes a lead(Pb)-free/RoHS-compliant package. /V denotes an automotive qualified part. Appliances Typical Application Circuit VCC Pin Configuration TOP VIEW VCC N.C. VOUT 0.1μF + MICROCONTROLLER VCC 1 GND 2 MAX6613 GND GND 5 GND 4 VCC ADC IN MAX6613 100pF GND OUT 3 SC70 ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 MAX6613 General Description MAX6613 Low-Voltage Analog Temperature Sensor in an SC70 Package ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND, unless otherwise noted.) VCC to GND ..............................................................-0.3V to +6V All Other Pins to GND.................................-0.3V to (VCC + 0.3V) OUT Short to GND......................................................Continuous Output Current ....................................................-1mA to +50mA ESD Protection (Human Body Model)................................2000V Continuous Power Dissipation (TA = +70°C) 5-Pin SC70 (derate 3.1mW/°C above +70°C) ...........246.9mW Operating Temperature Range .........................-55°C to +130°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering 10s) ..................................+300°C Soldering Temperature (reflow) .......................................+260°C 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. DC ELECTRICAL CHARACTERISTICS (VCC = 1.8V to 5.5V, TA = -55°C to +130°C. Typical values are at TA = +25°C, unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS VCC = 2.7V, TA = 0°C to +50°C Temperature-to-Voltage Error (Notes 2, 3) -4 +4 +4.4 VCC = 2.7V, TA = -55°C to +100°C -4.5 +4.5 VCC = 2.7V, TA = +100°C to +125°C -4.7 +4.7 VCC = 2.7V, TA = +125°C to +130°C -5 Nonlinearity TA = -55°C to +100°C Sensor Gain (Temperature Sensitivity or Average Slope) TA = -20°C to +100°C (Note 3) Supply Sensitivity (Note 3) -10.98 IQ ±0.4 % -11.23 -11.47 300 0 < IL < 16µA, TA = -55°C to +125°C -2.5 0 < IL < 16µA, TA = 125°C to 130°C -4.8 mV/°C Ω mV TA = -20°C to +130°C, VCC ≤ 5.5V 1 3.3 TA = -55°C to -20°C, VCC ≤ 4.5V 1 4.7 mV/V 13 µA 1000 pF 1 No load Long-Term Stability TA = room temperature for 1000hr (Note 4) Temperature Coefficient of Supply Current 2 V 160 No sustained oscillations for capacitive loads in this range (Note 4) Note 1: Note 2: Note 3: Note 4: °C +5 0 < IL < 16µA, TA = -55°C to +125°C Capacitive Load Power-Down Supply Current UNITS 1.8455 0 < IL < 16µA, TA = +125°C to +130°C TA = -55°C to -20°C, VCC ≤ 5.5V Quiescent Current MAX -4.4 TA = 0°C Load Regulation TYP VCC = 2.7V, TA = -20°C to +85°C Output Voltage Maximum Output Impedance MIN VCC < 0.8V 7.5 0 0.1 °C 15 nA/°C 0.1 µA All parameters tested at room temperature. Values through temperature limits are guaranteed by design. VOUT = -0.0000022 ✕ T2 - 0.01105 ✕ T + 1.8455 (T = temperature in degrees Celsius). Guaranteed by design to 3 sigma. Guaranteed by design. _______________________________________________________________________________________ Low-Voltage Analog Temperature Sensor in an SC70 Package OUTPUT VOLTAGE vs. SUPPLY VOLTAGE MAX6613 toc03 MAX6613 toc02 8 7 6 5 4 3 1 0 0 1.0 2.0 3.0 4.0 5.0 6.0 0 1.0 SUPPLY VOLTAGE (V) SUPPLY CURRENT vs. TEMPERATURE 2.0 3.0 4.0 5.0 6.0 SUPPLY VOLTAGE (V) STEP RESPONSE FROM +25°C TO +125°C MAX6613 toc05 MAX6613 toc04 10.0 9.5 9.0 8.0 9 2 TEMPERATURE (°C) 8.5 SUPPLY CURRENT vs. SUPPLY VOLTAGE 10 SUPPLY CURRENT (μA) OUTPUT VOLTAGE (V) MAX6613 toc01 1.510 1.508 1.506 1.504 1.502 1.500 1.498 1.496 1.494 1.492 1.490 1.488 1.486 1.484 1.482 1.480 -40 -25 -10 5 20 35 50 65 80 95 110 125 SUPPLY CURRENT (μA) OUTPUT VOLTAGE (V) OUTPUT VOLTAGE vs. TEMPERATURE 2.3 2.2 2.1 2.0 1.9 1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 0.4 1.55V VOUT VCC = 3.3V VCC = 5V 200mV/div 7.5 VCC = 2.7V 7.0 6.5 6.0 430mV 5.5 5.0 -40 -25 -10 5 20 35 50 65 80 95 110 125 1s/div TEMPERATURE (°C) Pin Description PIN NAME FUNCTION 1 N.C. No Connection. Must be connected to ground or left unconnected. 2 GND Ground. Should be connected to pin 5. May be left unconnected, if desired. 3 OUT Voltage Output 4 VCC Supply Voltage. Bypass to GND with a 0.1μF capacitor. 5 GND Ground _______________________________________________________________________________________ 3 MAX6613 Typical Operating Characteristics (RL = ∞Ω, TA = +30°C, unless otherwise noted.) MAX6613 Low-Voltage Analog Temperature Sensor in an SC70 Package Table 1. Linear and Quadratic Output Equation PARAMETER SYMBOL Temperature Error Based on: OUT = 1.8639 - 0.0115 x Temp (Note 4) Temperature Error Based on: OUT = 1.8639 - 0.0115 x Temp 0.00000388 x Temp2 (Note 4) CONDITIONS MIN TYP VCC = 2.7V, TA = -55°C 0.6 7.9 VCC = 2.7V, TA = -20°C -0.4 +5.8 VCC = 2.7V, TA = 0°C -0.9 +4.5 VCC = 2.7V, TA = +50°C -2.6 +3.0 VCC = 2.7V, TA = +85°C -3.6 +3.5 VCC = 2.7V, TA = +100°C -4.0 +3.7 VCC = 2.7V, TA = +125°C -4.8 +4.2 VCC = 2.7V, TA = +130°C -5.1 +4.2 VCC = 2.7V, TA = -55°C -0.4 +6.9 VCC = 2.7V, TA = -20°C -0.6 +5.7 VCC = 2.7V, TA = 0°C -0.9 +4.5 VCC = 2.7V, TA = +50°C -3.5 +2.1 VCC = 2.7V, TA = +85°C -6.1 +1.0 VCC = 2.7V, TA = +100°C -7.4 +0.4 VCC = 2.7V, TA = +125°C -10.1 -1.0 VCC = 2.7V, TA = +130°C -10.8 -1.5 Detailed Description The MAX6613 analog output temperature sensor’s output voltage is a discrete function of its die temperature. The maximum supply current is 13µA, and the supply voltage range is from 2.5V to 5.5V for the -55°C to +130°C temperature range, or 1.8V to 5.5V for the +25°C to +130°C temperature range. Transfer Function The temperature-to-voltage transfer function is approximately linear and can be described by the quadratic equation: UNITS °C °C where T is the die temperature of the MAX6613 in °C. Therefore: T = (1.8455 - VOUT) / 0.01123V Compatibility with Other Temperature Sensors The MAX6613 can be used to replace temperature sensors using other output algorithms. Table 1 provides information for a linear and quadratic output equation. Contact the factory for performance information about another equation. VOUT = -0.0000022 ✕ T2 - 0.01105 ✕ T + 1.8455V In many cases, a linear approximation can be applied: VOUT = -0.01123 ✕ T + 1.8455V 4 MAX _______________________________________________________________________________________ Low-Voltage Analog Temperature Sensor in an SC70 Package Sensing Circuit Board and Ambient Temperature A temperature sensor IC like the MAX6613 that senses its own die temperature must be mounted on, or close to, the object whose temperature it is intended to measure. Because there is a good thermal path between the package’s metal lead and the IC die, the MAX6613 can accurately measure the temperature of the circuit board to which it is soldered. If the sensor is intended to measure the temperature of a heat-generating component on the circuit board, it should be mounted as close as possible to that component and should share supply and ground traces (if they are not noisy) with that component where possible. This optimizes the thermal connection from the component to the sensor. The thermal path between the plastic package and the die is not as good as the path through the lead, so the MAX6613, like all temperature sensors in plastic packages, is less sensitive to the temperature of the surrounding air than to the temperature of its leads. It can be successfully used to sense ambient temperature if the circuit board is designed to track the ambient temperature. As with any IC, the wiring and circuits must be kept insulated and dry to avoid leakage and corrosion, especially if the part is operated at cold temperatures where condensation can occur. The change in die temperature introduced by the part due to self-heating is negligible. Chip Information PROCESS: BiCMOS Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 5 SC70 X5+1 21-0076 90-0188 _______________________________________________________________________________________ 5 MAX6613 Applications Information MAX6613 Low-Voltage Analog Temperature Sensor in an SC70 Package Revision History REVISION NUMBER REVISION DATE 0 5/02 1 11/03 2 1/06 3 12/10 DESCRIPTION PAGES CHANGED Initial release — Fix error in equation 4 Update spec in table 2 Add lead-free and automotive part, style edits 1, 2, 3, 5, 6 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2010 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.