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MAX6605MXK-T
Low-Power Analog Temperature Sensor in SC70 Package
General DescriptionThe MAX6605 precision, low-power, analog output tem-
perature sensor is available in a 5-pin SC70 package.
The device has a +2.7V to +5.5V supply voltage range
and 10µA supply current over the -55°C to +125°C tem-
perature range. For the -40°C to +105°C temperature
range, the supply voltage can go as low as +2.4V.
Accuracy is ±1°C at TA= +25°C and ±3°C from 0°C to
+70°C.
The MAX6605 output voltage is dependent on its die
temperature and has a slope of 11.9mV/°C and an off-
set of 744mV at 0°C. The output typically shows only
+0.4°C of nonlinearity over the -20°C to +85°C temper-
ature range.
________________________ApplicationsCellular Phones
Battery Packs
GPS Equipment
Digital Cameras
FeaturesLow Current Consumption (10µA max)Small SC70 Package Accurate (±1°C max at TA= +25°C)Optimized to Drive Large Capacitive Loads
MAX6605
Low-Power Analog Temperature Sensor
in SC70 Package
Typical Application Circuit19-1840; Rev 0; 10/00
Ordering Information
Pin Configuration
MAX6605
Low-Power Analog Temperature Sensor
in SC70 Package
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICSStresses 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.
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.
VCCto 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= +70°C)
5-Pin SC70 (derate 3.1mW/°C above +70°C)..............245mW
Operating Temperature Range.........................-55°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
MAX6605
Low-Power Analog Temperature Sensor
in SC70 Package OUTPUT VOLTAGE vs. TEMPERATURE
MAX6605 toc01
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
TEMPERATURE ERROR
vs. TEMPERATURE
MAX6605 toc02
TEMPERATURE (°C)
TEMPERATURE ERROR (
°C)3145
SUPPLY CURRENT
vs. SUPPLY VOLTAGEMAX6605 toc03
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
SUPPLY CURRENT
vs. TEMPERATURE
MAX6605 toc04
TEMPERATURE (°C)
SUPPLY CURRENT (
OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE
MAX6605 toc05
SUPPLY VOLTAGE (V)
OUTPUT VOLTAGE (V)
OUT
500mV/div
1s/div
STEP-RESPONSE FROM +25°C TO +100°C
(FLUORINERT BATH)MAX6605 toc06
Typical Operating Characteristics(VCC= +3.3V, CS= 0.1µF, CL= 1nF, unless otherwise noted.)
Detailed DescriptionThe MAX6605 analog output temperature sensor’s out-
put 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 0°C to allow measurement of nega-
tive temperatures. The MAX6605 has three terminals:
VCC, GND, and OUT. The maximum supply current is
10µA, and the supply voltage range is from +2.4V to
+5.5V for the -40°C to +105°C temperature range and
+2.7V to +5.5V for the -55°C to +125°C temperature
range. The temperature error is <1°C at TA= +25°C,
<3.8°C from TA= -20°C to +85°C, and <5.8°C from TA
= -55°C to +125°C.
NonlinearityThe benefit of silicon analog temperature sensors over
thermistors is linearity over extended temperatures. The
nonlinearity of the MAX6605 is typically 0.4°C over the
-20°C to +85°C temperature range.
Transfer FunctionThe 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 ✕10-6mV/°C2✕(T(°C))2
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 intend-
ed 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 temper-
ature 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 will maxi-
mize 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 pack-
ages, is less sensitive to the temperature of the surround-
ing air than it is to the temperature of its leads. It can be
successfully used to sense ambient temperature if the cir-
cuit board is designed to track the ambient temperature.
As with any IC, the wiring and circuits must be kept insu-
lated and dry to avoid leakage and corrosion, especially if
the part will be operated at cold temperatures where con-
densation can occur.
The thermal resistance junction to ambient (θJA) 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:= TA+ θJA((VCC×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 sup-
ply at +21.6°C (VOUT= 1V) and is driving a 100kΩload
(IOUT= 10µA). In the 5-pinSC70 package, the die tem-
perature will increase above the ambient by:- TA= θJA((VCC×IQ) + (VCC- VOUT) IOUT) =
324°C/W ×((3V ×10µA) + (3V - 1V) ×10µA) = 0.0162°C
Therefore, the error caused by power dissipation will be
negligible.
MAX6605
Low-Power Analog Temperature Sensor
in SC70 Package
Capacitive LoadsThe MAX6605 can drive unlimited load capacitance.
For stable operation load capacitance should be >1nF.
Low-Power Analog Temperature Sensor
in SC70 Package 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.
MAX6605
Package Information
Chip InformationTRANSISTOR COUNT: 573
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