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PDF SM72480 Data sheet ( Hoja de datos )
| Número de pieza | SM72480 | |
| Descripción | LLP-6 Factory Preset Temperature Switch and Temperature Sensor | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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SM72480
May 11, 2011
SolarMagic 1.6V, LLP-6 Factory Preset Temperature Switch
and Temperature Sensor
General Description
The SM72480 is a low-voltage, precision, dual-output, low-
power temperature switch and temperature sensor. The tem-
perature trip point (TTRIP) is set at the factory to be 120°C.
Built-in temperature hysteresis (THYST) keeps the output sta-
ble in an environment of temperature instability.
In normal operation the SM72480 temperature switch outputs
assert when the die temperature exceeds TTRIP. The temper-
ature switch outputs will reset when the temperature falls
below a temperature equal to (TTRIP − THYST). The
OVERTEMP digital output, is active-high with a push-pull
structure, while the OVERTEMP digital output, is active-low
with an open-drain structure.
The analog output, VTEMP, delivers an analog output voltage
with Negative Temperature Coefficient — NTC.
Driving the TRIP TEST input high: (1) causes the digital out-
puts to be asserted for in-situ verification and, (2) causes the
threshold voltage to appear at the VTEMP output pin, which
could be used to verify the temperature trip point.
The SM72480's low minimum supply voltage makes it ideal
for 1.8 volt system designs. Its wide operating range, low
supply current , and excellent accuracy provide a temperature
switch solution for a wide range of commercial and industrial
applications.
Applications
■ PV Power Optimizers
■ Wireless Transceivers
■ Battery Management
■ Automotive
■ Disk Drives
Features
■ Renewable Energy Grade
■ Low 1.6V operation
■ Latching function: device can latch the Over Temperature
condition
■ Push-pull and open-drain temperature switch outputs
■ Very linear analog VTEMP temperature sensor output
■ VTEMP output short-circuit protected
■ 2.2 mm by 2.5 mm (typ) LLP-6 package
■ Excellent power supply noise rejection
Key Specifications
■ Supply Voltage
■ Supply Current
■ Accuracy, Trip Point
Temperature
■ Accuracy, VTEMP
■ VTEMP Output Drive
■ Operating Temperature
■ Hysteresis Temperature
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1.6V to 5.5V
8 μA (typ)
0°C to 150°C
±2.2°C
0°C to 150°C
±2.3°C
±100 μA
−50°C to 150°C
4.5°C to 5.5°C
Connection Diagram
Typical Transfer Characteristic
LLP-6
VTEMP Analog Voltage vs Die Temperature
Top View
30142001
See NS Package Number SDB06A
© 2011 National Semiconductor Corporation 301420
30142024
www.national.com
Datasheet pdf - http://www.DataSheet4U.co.kr/
1 page  
Absolute Maximum Ratings (Note 1)
Supply Voltage
−0.3V to +6.0V
Voltage at OVERTEMP pin
−0.3V to +6.0V
Voltage at OVERTEMP and
VTEMP pins
TRIP TEST Input Voltage
Output Current, any output pin
−0.3V to (VDD + 0.5V)
−0.3V to (VDD + 0.5V)
±7 mA
Input Current at any pin (Note 2)
5 mA
Storage Temperature
−65°C to +150°C
Maximum Junction Temperature
TJ(MAX)
ESD Susceptibility (Note 3) :
+155°C
Human Body Model
4500V
Machine Model
300V
Charged Device Model
1000V
For soldering specifications: see product folder at
www.national.com and www.national.com/ms/MS/MS-
SOLDERING.pdf
Operating Ratings (Note 1)
Specified Temperature Range:
SM72480
Supply Voltage Range (VDD)
Thermal Resistance (θJA) (Note 4)
LLP-6 (Package SDB06A)
TMIN ≤ TA ≤ TMAX
−50°C ≤ TA ≤ +150°C
+1.6 V to +5.5 V
152 °C/W
Accuracy Characteristics
Trip Point Accuracy
Parameter
Trip Point Accuracy (Note 7)
Conditions
0°C − 150°C
VDD = 5.0 V
Limits
(Note 6)
±2.2
Units
(Limit)
°C (max)
VTEMP Analog Temperature Sensor Output Accuracy
The limits do not include DC load regulation. The stated accuracy limits are with reference to the values in the SM72480 Conversion
Table.
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Parameter
Conditions
Limits
(Note 6)
Units
(Limit)
VTEMP Temperature
Accuracy
(Note 7)
Trip Point
125°C or 120°C
VTEMP Temperature
Accuracy
Trip Point
105°C
TA = 20°C to 40°C
TA = 0°C to 70°C
TA = 0°C to 90°C
TA = 0°C to 120°C
TA = 0°C to 150°C
TA = –50°C to 0°C
TA = 20°C to 40°C
TA = 0°C to 70°C
TA = 0°C to 90°C
TA = 0°C to 120°C
TA = 0°C to 150°C
TA = −50°C to 0°C
VDD = 2.3 to 5.5 V
VDD = 2.5 to 5.5 V
VDD = 2.5 to 5.5 V
VDD = 2.5 to 5.5 V
VDD = 2.5 to 5.5 V
VDD = 3.0 to 5.5 V
VDD = 1.8 to 5.5 V
VDD = 1.9 to 5.5 V
VDD = 1.9 to 5.5 V
VDD = 1.9 to 5.5 V
VDD = 1.9 to 5.5 V
VDD = 2.3 to 5.5 V
±1.8
±2.0
±2.1
±2.2
±2.3
±1.7
±1.8
±2.0
±2.1
±2.2
±2.3
±1.7
°C (max)
(Note 7)
°C (max)
5 www.national.com
Datasheet pdf - http://www.DataSheet4U.co.kr/
5 Page 
Die Temp.,
°C
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
VTEMP, Analog Output Voltage, mV
TTRIP =
125 or 120°C
TTRIP = 105°C
756 567
745 559
734 551
724 543
713 535
702 527
691 519
681 511
670 503
659 495
649 487
638 479
627 471
616 463
606 455
595 447
584 438
573 430
562 422
552 414
1.1 VTEMP vs DIE TEMPERATURE APPROXIMATIONS
The SM72480's VTEMP analog temperature output is very lin-
ear. The Conversion Table above and the equation in Section
1.1.1 represent the most accurate typical performance of the
VTEMP voltage output vs Temperature.
1.1.1 The Second-Order Equation (Parabolic)
The data from the Conversion Table, or the equation below,
when plotted, has an umbrella-shaped parabolic curve.
VTEMP is in mV.
1.1.2 The First-Order Approximation (Linear)
For a quicker approximation, although less accurate than the
second-order, over the full operating temperature range the
linear formula below can be used. Using this formula, with the
constant and slope in the following set of equations, the best-
fit VTEMP vs Die Temperature performance can be calculated
with an approximation error less than 18 mV. VTEMP is in mV.
1.1.3 First-Order Approximation (Linear) over Small
Temperature Range
For a linear approximation, a line can easily be calculated
over the desired temperature range from the Conversion Ta-
ble using the two-point equation:
Where V is in mV, T is in °C, T1 and V1 are the coordinates of
the lowest temperature, T2 and V2 are the coordinates of the
highest temperature.
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Using this method of linear approximation, the transfer func-
tion can be approximated for one or more temperature ranges
of interest.
11
www.national.com
Datasheet pdf - http://www.DataSheet4U.co.kr/
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet SM72480.PDF ] | |
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