Maxim MAX6613 Low-voltage analog temperature sensor in an sc70 package Datasheet

19-2477; Rev 1; 11/03
Low-Voltage Analog Temperature
Sensor in an SC70 Package
The operating temperature range varies with the voltage supply. The MAX6613 can be used over a range of
-55°C to +130°C with a supply voltage of 2.5V to 5.5V.
For applications with a supply voltage of 1.8V, the
MAX6613 can be used over a temperature range of
+25°C to +130°C.
Applications
Cellular Phones
Disk Drives
GPS Equipment
Printers
Medical Instruments
Fax Machines
Battery Management
HVAC
Features
♦ Supply Voltage from 1.8V to 5.5V
♦ 1.3°C Accuracy
♦ Low Supply Consumption, 7.5µA (typ)
♦ Temperature Range -55°C to +130°C
♦ SC70 Package
♦ Pin Compatible to LM20
Ordering Information
PART
TEMP RANGE
MAX6613MXK-T
-55°C to +130°C
PINPACKAGE
5 SC70-5
TOP
MARK
ADJ
Appliances
Typical Application Circuit
Pin Configuration
TOP VIEW
VCC
VCC
MICROCONTROLLER
VCC
VOUT
N.C.
1
GND
4
VCC
ADC IN
GND 2
0.1µF
5
MAX6613
MAX6613
GND
GND
100pF
OUT 3
GND
SC70
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
MAX6613
General Description
The MAX6613 is a low-power analog precision analog
output temperature sensor in a tiny 5-pin SC70 package. The MAX6613 operates over a supply voltage
range of 1.8V to 5.5V, 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 proportional to temperature. Accuracy is ±1.3°C (max)
over a range of TA = 0°C to +50°C and ±2.0°C (max)
from TA = -20°C to +80°C. Self-heating effects are negligible 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.
MAX6613
Low-Voltage Analog Temperature
Sensor in an SC70 Package
ABSOLUTE MAXIMUM RATINGS
(All Voltages Referenced to GND, Unless Otherwise Noted.)
VCC to GND ..............................................................-0.3V to +6V
All Other Pins to GND.................................-0.3V to (VCC + 0.3V)
OUT Short to GND......................................................Continuous
Output Current ....................................................-1mA to +50mA
ESD Protection (Human Body Model)................................2000V
Continuous Power Dissipation (TA = +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
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
(VCC = 1.8V to 5.5V, TA = -55°C to +130°C. Typical values are at TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
VCC = 2.7V, TA = 0°C to +50°C
Temperature-to-Voltage Error
(Notes 2, 3)
+2
-2.4
+2.4
VCC = 2.7V, TA = +100°C to +125°C
-2.8
+2.8
VCC = 2.7V, TA = +125°C to +130°C
-3.1
TA = -55°C to +100°C
Sensor Gain (Temperature
Sensitivity or Average Slope)
TA = -20°C to +100°C (Note 3)
-10.98
IQ
±0.4
%
-11.23
-11.47
160
0 < IL < 16µA, TA = -55°C to +125°C
-2.5
0 < IL < 16µA, TA = 125°C to 130°C
-4.8
mV/°C
Ω
mV
TA = -20°C to +130°C, VCC ≤ 5.5V
1
3.3
TA = -55°C to -20°C, VCC ≤ 4.5V
1
4.7
mV/V
13
µA
1000
pF
1
No load
Long-Term Stability
TA = room temperature for 1000hr (Note 4)
Temperature Coefficient of
Supply Current
2
V
300
Capacitive Load
Note 1:
Note 2:
Note 3:
Note 4:
+3.1
0 < IL < 16µA, TA = -55°C to +125°C
No sustained oscillations for capacitive
loads in this range (Note 4)
Power-Down Supply Current
°C
1.8455
0 < IL < 16µA, TA = +125°C to +130°C
TA = -55°C to -20°C, VCC ≤ 5.5V
Quiescent Current
UNITS
+1.3
VCC = 2.7V, TA = -55°C to +100°C
Nonlinearity
Supply Sensitivity (Note 3)
-1.3
MAX
-2
TA = 0°C
Load Regulation
TYP
VCC = 2.7V, TA = -20°C to +85°C
Output Voltage
Maximum Output Impedance
MIN
VCC < 0.8V
7.5
0
0.1
°C
15
nA/°C
0.1
µA
All parameters tested at room temperature. Values through temperature limits are guaranteed by design.
VOUT = -0.0000022 ✕ T2 - 0.0115 ✕ T + 1.8639 (T = temperature in degrees Celsius).
Guaranteed by design to 3 sigma.
Guaranteed by design.
_______________________________________________________________________________________
Low-Voltage Analog Temperature
Sensor in an SC70 Package
OUTPUT VOLTAGE vs. SUPPLY VOLTAGE
MAX6613 toc03
MAX6613 toc02
8
7
6
5
4
3
1
0
0
1.0
2.0
3.0
4.0
5.0
6.0
0
SUPPLY VOLTAGE (V)
1.0
2.0
3.0
4.0
5.0
6.0
SUPPLY VOLTAGE (V)
STEP RESPONSE FROM +25°C TO +125°C
SUPPLY CURRENT vs. TEMPERATURE
MAX6613 toc05
MAX6613 toc04
10.0
9.5
9.0
8.0
9
2
TEMPERATURE (°C)
8.5
SUPPLY CURRENT vs. SUPPLY VOLTAGE
10
SUPPLY CURRENT (µA)
OUTPUT VOLTAGE (V)
MAX6613 toc01
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
-40 -25 -10 5 20 35 50 65 80 95 110 125
SUPPLY CURRENT (µA)
OUTPUT VOLTAGE (V)
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
1.55V
VOUT
VCC = 3.3V
VCC = 5V
200mV/div
7.5
VCC = 2.7V
7.0
6.5
6.0
430mV
5.5
5.0
-40 -25 -10 5 20 35 50 65 80 95 110 125
1s/div
TEMPERATURE (°C)
Pin Description
PIN
NAME
FUNCTION
1
N.C.
No Connection. Must be connected to ground or left floating.
2
GND
Ground. Should be connected to pin 5. May be left floating, if desired.
3
OUT
Voltage Output
4
VCC
Supply Voltage. Bypass to GND with a 0.1µF capacitor.
5
GND
Ground
_______________________________________________________________________________________
3
MAX6613
Typical Operating Characteristics
(RL = ∞Ω, TA = +30°C, unless otherwise noted.)
MAX6613
Low-Voltage Analog Temperature
Sensor in an SC70 Package
Table 1. Linear and Quadratic Output Equation
PARAMETER
SYMBOL
Temperature Error
Based on:
OUT = 1.8639 - 0.0115 ✕ Temp
(Note 4)
Temperature Error
Based on:
OUT = 1.8639 - 0.0115 ✕ Temp 0.00000388 ✕ Temp2 (Note 4)
CONDITIONS
MIN
TYP
2.06
6.57
VCC = 2.7V, TA = -40°C
1.19
5.73
VCC = 2.7V, TA = -20°C
0.55
4.36
VCC = 2.7V, TA = 0°C
0.35
2.85
VCC = 2.7V, TA = +20°C
-0.37
+2.15
VCC = 2.7V, TA = +40°C
-1.32
+1.61
VCC = 2.7V, TA = +60°C
-2.02
+1.92
VCC = 2.7V, TA = +85°C
-2.32
+1.66
VCC = 2.7V, TA = +100°C
-2.78
+2.01
VCC = 2.7V, TA = +125°C
-3.11
+2.54
VCC = 2.7V, TA = +130°C
-3.37
+2.90
VCC = 2.7V, TA = -55°C
1.08
5.76
VCC = 2.7V, TA = -40°C
0.67
5.33
VCC = 2.7V, TA = -20°C
0.42
4.28
VCC = 2.7V, TA = 0°C
0.35
2.85
VCC = 2.7V, TA = +20°C
-0.49
+1.99
VCC = 2.7V, TA = +30°C
-0.95
+1.53
VCC = 2.7V, TA = +40°C
-1.81
+1.05
VCC = 2.7V, TA = +50°C
-1.93
+0.54
VCC = 2.7V, TA = +60°C
-3.11
+0.67
VCC = 2.7V, TA = +85°C
-4.51
-0.74
VCC = 2.7V, TA = +100°C
-5.77
-1.28
VCC = 2.7V, TA = +125°C
-7.74
-2.52
VCC = 2.7V, TA = +130°C
-8.35
-2.58
Detailed Description
The MAX6613 analog output temperature sensor’s output 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.
Transfer Function
The temperature-to-voltage transfer function is approximately linear and can be described by the quadratic
equation:
UNITS
°C
°C
Therefore:
T = (1.8455 - VOUT) / 0.01123V
Compatibility with Other Temperature
Sensors
The MAX6613 can be used to replace temperature sensors using other output algorithms. Table 1 provides
information for a linear and quadratic output equation.
Contact the factory for performance information about
another equation.
VOUT = -0.0000022 ✕ T2 - 0.01105 ✕ T + 1.8455V
In many cases, a linear approximation can be applied:
VOUT = -0.01123 ✕ T + 1.8455V
where T is the die temperature of the MAX6613 in °C.
4
MAX
VCC = 2.7V, TA = -55°C
_______________________________________________________________________________________
Low-Voltage Analog Temperature
Sensor in an SC70 Package
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 measure. 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 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 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 packages, is less sensitive to the temperature of the surrounding 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 temperature.
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.
Chip Information
TRANSISTOR COUNT: 307
PROCESS: BiCMOS
_______________________________________________________________________________________
5
MAX6613
Applications Information
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
SC70, 5L.EPS
MAX6613
Low-Voltage Analog Temperature
Sensor in an 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.
6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2003 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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