LTC2997
Remote/Internal
Temperature Sensor
FEATURES DESCRIPTION
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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
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1C Remote Temperature Accuracy
its own temperature to an analog voltage output. A built-in
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1.5C Internal Temperature Accuracy
algorithm eliminates errors due to series resistance be-
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Built-In Series Resistance Cancellation
tween the LTC2997 and the sensor diode.
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2.5V to 5.5V Supply Voltage
The LTC2997 gives accurate results with low-cost diode-
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1.8V Reference Voltage Output
connected NPN or PNP transistors or with integrated
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3.5ms V Update Time
PTAT
temperature transistors on microprocessors or FPGAs.
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4mV/K Output Gain
+
Tying pin D to V configures the LTC2997 to measure
CC
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170A Quiescent Current
its internal temperature.
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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
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Remote Temperature Measurement
The LTC2997 provides a precise and versatile micropower
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Environmental Monitoring
solution for accurate temperature sensing.
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System Thermal Control
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
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Desktop and Notebook Computers Technology Corporation. All other trademarks are the property of their respective owners.
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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: