LTC2997 Remote/Internal Temperature Sensor FEATURES DESCRIPTION n Converts Remote Sensor or Internal Diode The LTC 2997 is a high-accuracy analog output temperature Temperature to Analog Voltage sensor. It converts the temperature of an external sensor or n 1C Remote Temperature Accuracy its own temperature to an analog voltage output. A built-in n 1.5C Internal Temperature Accuracy algorithm eliminates errors due to series resistance be- n Built-In Series Resistance Cancellation tween the LTC2997 and the sensor diode. n 2.5V to 5.5V Supply Voltage The LTC2997 gives accurate results with low-cost diode- n 1.8V Reference Voltage Output connected NPN or PNP transistors or with integrated n 3.5ms V Update Time PTAT temperature transistors on microprocessors or FPGAs. n 4mV/K Output Gain + Tying pin D to V configures the LTC2997 to measure CC n 170A Quiescent Current its internal temperature. n Available in 6-Pin 2mm 3mm DFN Package The LTC2997 provides an additional 1.8V reference voltage output which can be used as an ADC reference input or APPLICATIONS for generating temperature threshold voltages to compare against the V output. n PTAT Temperature Measurement n Remote Temperature Measurement The LTC2997 provides a precise and versatile micropower n Environmental Monitoring solution for accurate temperature sensing. n System Thermal Control L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear n Desktop and Notebook Computers Technology Corporation. All other trademarks are the property of their respective owners. n Network Servers TYPICAL APPLICATION Single Remote Temperature Sensor V vs Remote Sensor Temperature PTAT 2.5V TO 5.5V 1.8 0.1F 1.6 MMBT 3904 V CC 1.8V + D V REF 1.4 LTC2997 470pF 4mV/K 1.2 D V PTAT GND 2997 TA01a 1.0 0.8 50 2505250 75 100 125 150 REMOTE SENSOR TEMPERATURE (C) 2997 TA01b 2997fa 1 V (V) PTATLTC2997 ABSOLUTE MAXIMUM RATINGS (Notes 1, 2) Terminal Voltages Operating Ambient Temperature Range V ........................................................... 0.3V to 6V LTC2997C ................................................ 0C to 70C CC + D , D , V , V ......................0.3V to V + 0.3V LTC2997I .............................................40C to 85C PTAT REF CC LTC2997H .......................................... 40C to 125C Storage Temperature Range .................. 65C to 150C PIN CONFIGURATION TOP VIEW + D 1 6 V REF D 2 7 5 GND V 4 V 3 CC PTAT DCB PACKAGE 6-LEAD (2mm w 3mm) PLASTIC DFN T = 150C, = 64C/W JMAX JA EXPOSED PAD PCB GROUND CONNECTION OPTIONAL ORDER INFORMATION Lead Free Finish TAPE AND REEL (MINI) TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC2997CDCB TRMPBF LTC2997CDCB TRPBF LFQZ 6-Lead (2mm 3mm) Plastic DFN 0C to 70C LTC2997IDCB TRMPBF LTC2997IDCB TRPBF LFQZ 6-Lead (2mm 3mm) Plastic DFN 40C to 85C LTC2997HDCB TRMPBF LTC2997HDCB TRPBF LFQZ 6-Lead (2mm 3mm) Plastic DFN 40C to 125C TRM = 500 pieces. *Temperature grades are identified by a label on the shipping container. Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on lead based finish parts. For more information on lead free part marking, go to: