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19-1840; Rev 0; 10/00
Low-Power Analog Temperature Sensor in SC70 Package
General Description
The MAX6605 precision, low-power, analog output temperature sensor is available in a 5-pin SC70 package. The device has a +2.7V to +5.5V supply voltage range and 10A supply current over the -55C to +125C temperature range. For the -40C to +105C temperature range, the supply voltage can go as low as +2.4V. Accuracy is 1C at TA = +25C and 3C from 0C to +70C. The MAX6605 output voltage is dependent on its die temperature and has a slope of 11.9mV/C and an offset of 744mV at 0C. The output typically shows only +0.4C of nonlinearity over the -20C to +85C temperature range. o Small SC70 Package o Accurate (1C max at TA = +25C) o Optimized to Drive Large Capacitive Loads
Features
o Low Current Consumption (10A max)
MAX6605
Ordering Information
PART MAX6605MXK-T TEMP. RANGE -55C to +125C PIN-PACKAGE 5 SC70-5
________________________Applications
Cellular Phones Battery Packs GPS Equipment Digital Cameras
TOP VIEW
VCC 1
Pin Configuration
5
GND
A2
MAX6605
OUT 3
4
B
SC70
Typical Application Circuit
VCC VCC MAX6605 CS = 0.1F A OUT IN+ REFOUT GND 1nF IN- GND GND GND REFIN B VDD SHDN VCC CPU I/O I/O I/O
MAX1106 CONVST SCLK DOUT
________________________________________________________________ Maxim Integrated Products
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Low-Power Analog Temperature Sensor in SC70 Package MAX6605
ABSOLUTE MAXIMUM RATINGS
VCC to GND ..............................................................-0.3V to +6V OUT, A, B to GND ......................................-0.3V to (VCC + 0.3V) ESD Protection (Human Body Model) .............................>2000V Current into Any Pin ............................................................10mA Output Short-Circuit Duration.....................................Continuous Continuous Power Dissipation (TA = +70C) 5-Pin SC70 (derate 3.1mW/C above +70C) ..............245mW Operating Temperature Range .........................-55C to +125C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C 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
(VCC = +2.7V to +5.5V, CL = 1nF, TA = -55C to +125C, unless otherwise noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS TA = +25C Temperature Error VOUT = 0.744 + (0.0119 x TC) + (1.604 x 10-6 x T2)V (Note 2) TA = -0C to +70C VCC = +3.3V TA = -20C to +85C TA = -40C to +100C TA = -55C to +125C Supply Voltage Supply Current Output Voltage Nonlinearity Sensor Gain (Average Slope) Capacitive Load Load Regulation VCC IQ VOUT TA = -55C to +125C TA = -40C to +105C No load TA = 0C TA = -20C to +85C TA = -40C to +100C Required for stability TA = -20C to +125C, IOUT = -20A to +20A TA = -55C, IOUT = -10A to +10A 11.1 1 20 20 MIN -1.0 -3.0 -3.8 -5.0 -5.8 2.7 2.4 4.5 744 0.4 11.9 12.7 TYP MAX +1.0 +3.0 +3.8 +5.0 +5.8 5.5 5.5 10 V A mV C mV/C nF mC/A C UNITS
Note 1: All parameters are measured at TA = +25C. Specifications over temperature range are guaranteed by design. Note 2: Error (expressed in C) is defined as the difference between the calculated and measured values of output voltage. Guaranteed by design to 5 sigma.
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Low-Power Analog Temperature Sensor in SC70 Package
Typical Operating Characteristics
(VCC = +3.3V, CS = 0.1F, CL = 1nF, unless otherwise noted.)
MAX6605
OUTPUT VOLTAGE vs. TEMPERATURE
MAX6605 toc01
TEMPERATURE ERROR vs. TEMPERATURE
MAX6605 toc02
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX6605 toc03
2.2 2.0 1.8 OUTPUT VOLTAGE (V) 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 -55 -35 -15 5 25 45 65
1.7 1.5 1.3 1.1 0.9 0.7 0.5 0.3 0.1 -0.1 -0.3 -0.5 -0.7 -0.9 -1.1 -1.3 -55 -35 -15 5 25 45 65 TEMPERATURE (C)
6 5 SUPPLY CURRENT (A) TA = +25C 4 3 2 1 0
TEMPERATURE ERROR (C)
85 105 125
85 105 125
0
1
2
3
4
5
TEMPERATURE (C)
SUPPLY VOLTAGE (V)
SUPPLY CURRENT vs. TEMPERATURE
MAX6605 toc04
OUTPUT VOLTAGE vs. SUPPLY VOLTAGE
MAX6605 toc05
STEP-RESPONSE FROM +25C TO +100C (FLUORINERT BATH)
MAX6605 toc06
7 6 SUPPLY CURRENT (A) 5 VCC = +3.3V 4 3 2 1 0 -55 -35 -15 5 25 45 65 VCC = +2.4V VCC = +5V
1.060 1.055 OUTPUT VOLTAGE (V) 1.050 1.045 1.040 1.035 1.030 1.025 1.020 TA = +25C
OUT 500mV/div
0 0 1 2 3 4 5 6 1s/div SUPPLY VOLTAGE (V)
85 105 125
TEMPERATURE (C)
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Low-Power Analog Temperature Sensor in SC70 Package MAX6605
Pin Description
PIN 1 2 3 4 5 NAME VCC A OUT B GND FUNCTION Supply Input. Decouple with a 0.1F capacitor to GND. Must be connected to GND. Temperature Sensor Output, CL 1nF Must be connected to VCC. Ground
Applications Information
Sensing Circuit Board and Ambient Temperatures
Temperature sensor ICs like the MAX6605 that sense their own die temperatures must be mounted on, or close to, the object whose temperature they are intended to measure. Because there is a good thermal path between the SC70 package's metal leads and the IC die, the MAX6605 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 heatgenerating 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 will maximize the heat transfer 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 leads, so the MAX6605, like all temperature sensors in plastic packages, is less sensitive to the temperature of the surrounding air than it is 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 will be operated at cold temperatures where condensation can occur. The thermal resistance junction to ambient (JA) is the parameter used to calculate the rise of a device junction temperature (TJ) due to its power dissipation. For the MAX6605, use the following equation to calculate the rise in die temperature: TJ = TA + JA ((VCC x IQ) + (VCC - VOUT) IOUT) The MAX6605 is a very-low-power temperature sensor and is intended to drive very light loads. As a result, the temperature rise due to power dissipation on the die is insignificant under normal conditions. For example, assume that the MAX6605 is operating from a +3V supply at +21.6C (VOUT = 1V) and is driving a 100k load (IOUT = 10A). In the 5-pin SC70 package, the die temperature will increase above the ambient by: TJ - TA = JA ((VCC x IQ) + (VCC - VOUT) IOUT) = 324C/W x ((3V x 10A) + (3V - 1V) x 10A) = 0.0162C Therefore, the error caused by power dissipation will be negligible.
Detailed Description
The MAX6605 analog output temperature sensor's output voltage is a linear function of its die temperature. The slope of the output voltage is 11.9mV/C, and there is a 744mV offset at 0C to allow measurement of negative temperatures. The MAX6605 has three terminals: VCC, GND, and OUT. The maximum supply current is 10A, and the supply voltage range is from +2.4V to +5.5V for the -40C to +105C temperature range and +2.7V to +5.5V for the -55C to +125C temperature range. The temperature error is <1C at TA = +25C, <3.8C from TA = -20C to +85C, and <5.8C from TA = -55C to +125C.
Nonlinearity
The benefit of silicon analog temperature sensors over thermistors is linearity over extended temperatures. The nonlinearity of the MAX6605 is typically 0.4C over the -20C to +85C temperature range.
Transfer Function
The temperature-to-voltage transfer function has an approximately linear positive slope and can be described by the equation: VOUT = 744mV + (T 11.9mV/C) where T is the MAX6605's die temperature in C. Therefore: T (C) = (VOUT - 744mV) / 11.9mV/C To account for the small amount of curvature in the transfer function, use the equation below to obtain a more accurate temperature reading: VOUT = 0.744V + 0.0119V/C T(C) + 1.604 10-6 mV/C2 (T(C))2
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Low-Power Analog Temperature Sensor in SC70 Package
Capacitive Loads
The MAX6605 can drive unlimited load capacitance. For stable operation load capacitance should be >1nF. TRANSISTOR COUNT: 573
Chip Information
MAX6605
Package Information
SC70, 5L.EPS
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600_____________________ 5 (c) 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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