sm72480sdx-125

Manufacturer Part Numbersm72480sdx-125
DescriptionSolarmagic 1.6v, Llp-6 Factory Preset Temperature Switch And Temperature Sensor
ManufacturerNational Semiconductor Corporation
sm72480sdx-125 datasheet
 


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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 (T
) is set at the factory to be 120°C.
TRIP
Built-in temperature hysteresis (T
HYST
ble in an environment of temperature instability.
In normal operation the SM72480 temperature switch outputs
assert when the die temperature exceeds T
ature switch outputs will reset when the temperature falls
below a temperature equal to (T
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, V
, delivers an analog output voltage
TEMP
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 V
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
Connection Diagram
LLP-6
Top View
See NS Package Number SDB06A
© 2011 National Semiconductor Corporation
SM72480
Features
Renewable Energy Grade
Low 1.6V operation
Latching function: device can latch the Over Temperature
) keeps the output sta-
condition
Push-pull and open-drain temperature switch outputs
Very linear analog V
. The temper-
TRIP
V
TEMP
− T
). The
2.2 mm by 2.5 mm (typ) LLP-6 package
TRIP
HYST
Excellent power supply noise rejection
Key Specifications
Supply Voltage
Supply Current
Accuracy, Trip Point
output pin, which
TEMP
Temperature
Accuracy, V
V
Output Drive
TEMP
Operating Temperature
Hysteresis Temperature
Typical Transfer Characteristic
V
TEMP
30142001
301420
temperature sensor output
TEMP
output short-circuit protected
0°C to 150°C
0°C to 150°C
TEMP
−50°C to 150°C
4.5°C to 5.5°C
Analog Voltage vs Die Temperature
30142024
www.national.com
May 11, 2011
1.6V to 5.5V
8 μA (typ)
±2.2°C
±2.3°C
±100 μA

sm72480sdx-125 Summary of contents

  • Page 1

    ... Battery Management ■ Automotive ■ Disk Drives Connection Diagram LLP-6 Top View See NS Package Number SDB06A © 2011 National Semiconductor Corporation SM72480 Features ■ Renewable Energy Grade ■ Low 1.6V operation ■ Latching function: device can latch the Over Temperature ) keeps the output sta- condition ■ ...

  • Page 2

    Block Diagram Pin Descriptions Pin Name Type No. TRIP Digital 1 TEST Input Digital 5 OVERTEMP Output Digital 3 OVERTEMP Output www.national.com Equivalent Circuit TRIP TEST pin. Active High input. If TRIP TEST = 0 (Default) then ...

  • Page 3

    Pin Name Type Equivalent Circuit No. Analog V 6 TEMP Output 4 V Power DD 2 GND Ground DAP Die Attach Pad Typical Application Description V Analog Voltage Output TEMP If TRIP TEST = 0 then ...

  • Page 4

    ... Ordering Information Temperature Order Number Trip Point, °C SM72480SD-125 125°C SM72480SDE-125 125°C SM72480SDX-125 125°C SM72480SD-120 120°C SM72480SDE-120 120°C SM72480SDX-120 120°C SM72480SD-105 105°C SM72480SDE-105 105°C SM72480SDX-105 105°C www.national.com NS Package Description Number 6–pin LLP SDB06A 6– ...

  • Page 5

    Absolute Maximum Ratings Supply Voltage Voltage at OVERTEMP pin Voltage at OVERTEMP and V pins −0. TEMP TRIP TEST Input Voltage −0. Output Current, any output pin Input Current at any pin (Note 2) Storage Temperature ...

  • Page 6

    Electrical Characteristics Unless otherwise noted, these specifications apply for + all other limits 25°C. MAX A J Symbol Parameter GENERAL SPECIFICATIONS I Quiescent Power Supply S Current Hysteresis OVERTEMP DIGITAL OUTPUT V Logic "1" ...

  • Page 7

    Electrical Characteristics Unless otherwise noted, these specifications apply for + all other limits 25°C. MAX A J Symbol Parameter TRIP TEST DIGITAL INPUT V Logic "1" Threshold Voltage IH V Logic "0" Threshold Voltage ...

  • Page 8

    Typical Performance Characteristics V Output Temperature Error vs. Temperature TEMP Supply Current vs. Temperature V Supply-Noise Rejection vs. Frequency TEMP www.national.com Minimum Operating Temperature vs. Supply Voltage 30142007 Supply Current vs. Supply Voltage 30142004 Line Regulation V TEMP 30142043 8 ...

  • Page 9

    SM72480 V vs Die TEMP Temperature Conversion Table The SM72480 has a factory-set gain, which is dependent on the Temperature Trip Point. The V TEMP voltage, in millivolts, at each discrete die temperature over the complete operating range is ...

  • Page 10

    V , Analog Output Voltage, mV TEMP Die Temp °C TRIP 125 or 120°C 35 1763 36 1753 37 1743 38 1732 39 1722 40 1712 41 1701 42 1691 43 1681 44 1670 45 1660 46 1650 ...

  • Page 11

    V , Analog Output Voltage, mV TEMP Die Temp °C TRIP 125 or 120°C 131 756 132 745 133 734 134 724 135 713 136 702 137 691 138 681 139 670 140 659 141 649 142 638 ...

  • Page 12

    OVERTEMP and OVERTEMP Digital Outputs The OVERTEMP Active High, Push-Pull Output and the OVERTEMP Active Low, Open-Drain Output both assert at the same time whenever the Die Temperature reaches the factory preset Temperature Trip Point. They also assert si- ...

  • Page 13

    FIGURE 1. SM72480 No Decoupling Required for Capacitive Loads Less than 1100 pF. C Minimum R LOAD 1 100 nF to 999 nF 1.5 kΩ 1 μF 800 Ω FIGURE 2. SM72480 with series resistor for ...

  • Page 14

    Applications Circuits FIGURE 4. Temperature Switch Using Push-Pull Output FIGURE 5. Temperature Switch Using Open-Drain Output Most CMOS ADCs found in microcontrollers and ASICs have a sampled data comparator input structure. When the ADC charges the sampling cap, it ...

  • Page 15

    FIGURE 8. TRIP TEST Digital Output Test Circuit The TRIP TEST pin, normally used to check the operation of the OVERTEMP and OVERTEMP pins, may be used to latch the outputs whenever the temperature exceeds the programmed limit and causes ...

  • Page 16

    Physical Dimensions www.national.com inches (millimeters) unless otherwise noted 6-Lead LLP-6 Package NS Package Number SDB06A 16 ...

  • Page 17

    Notes 17 www.national.com ...

  • Page 18

    ... National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. ...