19-2477; Rev 3; 12/10
Low-Voltage Analog Temperature
Sensor in an SC70 Package
General Description
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 pro-
portional to temperature. Accuracy is ±4.0°C (max)
over a range of T
A
= 0°C to +50°C and ±4.4°C (max)
from T
A
= -20°C to +80°C. Self-heating effects are neg-
ligible 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 volt-
age 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 tem-
perature range.
♦
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
Features
MAX6613
Ordering Information
PART
MAX6613MXK+T
TEMP RANGE
-55°C to +130°C
PIN-
PACKAGE
5 SC70-5
5 SC70-5
TOP
MARK
ADJ
ADJ
Applications
Cellular Phones
GPS Equipment
Medical Instruments
Battery Management
Appliances
Disk Drives
Printers
Fax Machines
HVAC
MAX6613MXK/V+T -55°C to +130°C
+Denotes
a lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive qualified part.
Typical Application Circuit
V
CC
V
CC
Pin Configuration
TOP VIEW
V
CC
VOUT
0.1μF
GND
GND
100pF
MICROCONTROLLER
+
N.C.
1
5
GND
ADC IN
MAX6613
GND
2
MAX6613
4
V
CC
GND
OUT
3
SC70
________________________________________________________________
Maxim Integrated Products
1
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.
Low-Voltage Analog Temperature
Sensor in an SC70 Package
MAX6613
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND, unless otherwise noted.)
V
CC
to GND ..............................................................-0.3V to +6V
All Other Pins to GND.................................-0.3V to (V
CC
+ 0.3V)
OUT Short to GND......................................................Continuous
Output Current ....................................................-1mA to +50mA
ESD Protection (Human Body Model)................................2000V
Continuous Power Dissipation (T
A
= +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
(V
CC
= 1.8V to 5.5V, T
A
= -55°C to +130°C. Typical values are at T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
V
CC
= 2.7V, T
A
= 0°C to +50°C
Temperature-to-Voltage Error
(Notes 2, 3)
V
CC
= 2.7V, T
A
= -20°C to +85°C
V
CC
= 2.7V, T
A
= -55°C to +100°C
V
CC
= 2.7V, T
A
= +100°C to +125°C
V
CC
= 2.7V, T
A
= +125°C to +130°C
Output Voltage
Nonlinearity
Sensor Gain (Temperature
Sensitivity or Average Slope)
Maximum Output Impedance
Load Regulation
T
A
= 0°C
T
A
= -55°C to +100°C
T
A
= -20°C to +100°C (Note 3)
0 < I
L
< 16µA, T
A
= -55°C to +125°C
0 < I
L
< 16µA, T
A
= +125°C to +130°C
0 < I
L
< 16µA, T
A
= -55°C to +125°C
0 < I
L
< 16µA, T
A
= 125°C to 130°C
T
A
= -20°C to +130°C, V
CC
≤
5.5V
Supply Sensitivity (Note 3)
Quiescent Current
Capacitive Load
Long-Term Stability
Temperature Coefficient of
Supply Current
Power-Down Supply Current
V
CC
< 0.8V
I
Q
T
A
= -55°C to -20°C, V
CC
≤
4.5V
T
A
= -55°C to -20°C, V
CC
≤
5.5V
No load
No sustained oscillations for capacitive
loads in this range (Note 4)
T
A
= room temperature for 1000hr (Note 4)
0
0.1
15
0.1
1
1
1
7.5
13
1000
µA
pF
°C
nA/°C
µA
-10.98
MIN
-4
-4.4
-4.5
-4.7
-5
1.8455
±0.4
-11.23
-11.47
160
300
-2.5
-4.8
3.3
4.7
mV/V
TYP
MAX
+4
+4.4
+4.5
+4.7
+5
V
%
mV/°C
Ω
mV
°C
UNITS
Note 1:
Note 2:
Note 3:
Note 4:
All parameters tested at room temperature. Values through temperature limits are guaranteed by design.
V
OUT
= -0.0000022
✕
T
2
- 0.01105
✕
T + 1.8455 (T = temperature in degrees Celsius).
Guaranteed by design to 3 sigma.
Guaranteed by design.
2
_______________________________________________________________________________________
Low-Voltage Analog Temperature
Sensor in an SC70 Package
MAX6613
Typical Operating Characteristics
(R
L
=
∞Ω,
T
A
= +30°C, unless otherwise noted.)
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
TEMPERATURE (°C)
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
MAX6613 toc01
OUTPUT VOLTAGE vs. SUPPLY VOLTAGE
MAX6613 toc02
SUPPLY CURRENT vs. SUPPLY VOLTAGE
9
8
SUPPLY CURRENT (μA)
7
6
5
4
3
2
1
0
MAX6613 toc03
10
OUTPUT VOLTAGE (V)
-40 -25 -10 5 20 35 50 65 80 95 110 125
OUTPUT VOLTAGE (V)
0
1.0
2.0
3.0
4.0
5.0
6.0
0
1.0
2.0
3.0
4.0
5.0
6.0
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
SUPPLY CURRENT vs. TEMPERATURE
MAX6613 toc04
STEP RESPONSE FROM +25°C TO +125°C
MAX6613 toc05
10.0
9.5
9.0
SUPPLY CURRENT (μA)
8.5
8.0
7.5
7.0
6.5
6.0
5.5
5.0
V
CC
= 2.7V
V
CC
= 5V
V
CC
= 3.3V
1.55V
V
OUT
200mV/div
430mV
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
1s/div
Pin Description
PIN
1
2
3
4
5
NAME
N.C.
GND
OUT
V
CC
GND
FUNCTION
No Connection. Must be connected to ground or left unconnected.
Ground. Should be connected to pin 5. May be left unconnected, if desired.
Voltage Output
Supply Voltage. Bypass to GND with a 0.1μF capacitor.
Ground
_______________________________________________________________________________________
3
Low-Voltage Analog Temperature
Sensor in an SC70 Package
MAX6613
Table 1. Linear and Quadratic Output Equation
PARAMETER
SYMBOL
CONDITIONS
V
CC
= 2.7V, T
A
= -55°C
V
CC
= 2.7V, T
A
= -20°C
Temperature Error
Based on:
OUT = 1.8639 - 0.0115 x Temp
(Note 4)
V
CC
= 2.7V, T
A
= 0°C
V
CC
= 2.7V, T
A
= +50°C
V
CC
= 2.7V, T
A
= +85°C
V
CC
= 2.7V, T
A
= +100°C
V
CC
= 2.7V, T
A
= +125°C
V
CC
= 2.7V, T
A
= +130°C
V
CC
= 2.7V, T
A
= -55°C
V
CC
= 2.7V, T
A
= -20°C
V
CC
= 2.7V, T
A
= 0°C
Temperature Error
Based on:
OUT = 1.8639 - 0.0115 x Temp -
0.00000388 x Temp
2
(Note 4)
V
CC
= 2.7V, T
A
= +50°C
V
CC
= 2.7V, T
A
= +85°C
V
CC
= 2.7V, T
A
= +100°C
V
CC
= 2.7V, T
A
= +125°C
V
CC
= 2.7V, T
A
= +130°C
MIN
0.6
-0.4
-0.9
-2.6
-3.6
-4.0
-4.8
-5.1
-0.4
-0.6
-0.9
-3.5
-6.1
-7.4
-10.1
-10.8
TYP
MAX
7.9
+5.8
+4.5
+3.0
+3.5
+3.7
+4.2
+4.2
+6.9
+5.7
+4.5
+2.1
+1.0
+0.4
-1.0
-1.5
°C
°C
UNITS
Detailed Description
The MAX6613 analog output temperature sensor’s out-
put 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.
where T is the die temperature of the MAX6613 in °C.
Therefore:
T = (1.8455 - V
OUT
) / 0.01123V
Compatibility with Other Temperature
Sensors
The MAX6613 can be used to replace temperature sen-
sors using other output algorithms. Table 1 provides
information for a linear and quadratic output equation.
Contact the factory for performance information about
another equation.
Transfer Function
The temperature-to-voltage transfer function is approxi-
mately linear and can be described by the quadratic
equation:
V
OUT
= -0.0000022
✕
T
2
- 0.01105
✕
T + 1.8455V
In many cases, a linear approximation can be applied:
V
OUT
= -0.01123
✕
T + 1.8455V
4
_______________________________________________________________________________________
Low-Voltage Analog Temperature
Sensor in an SC70 Package
Applications Information
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 mea-
sure. 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 com-
ponent 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 pack-
ages, is less sensitive to the temperature of the sur-
rounding 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 tem-
perature.
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.
MAX6613
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
5 SC70
PACKAGE
CODE
X5+1
OUTLINE
NO.
21-0076
LAND
PATTERN NO.
90-0188
_______________________________________________________________________________________
5
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