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150 W

TMP708

VCC

GND HYST

SET

Microprocessor

VCC

GND

SET

470 kW

0.1 Fm

2.7 V to 5.5 V

TMP708

www.ti.com

SBOS585A –DECEMBER 2011– REVISED FEBRUARY 2012

Resistor-Programmable Temperature Switch in SOT Package

Check for Samples: TMP708

FEATURES

APPLICATIONS

• Threshold Accuracy:

• Computers (Laptops and Desktops)

– ±0.5°C Typical • Servers

– ±3°C Maximum (+60°C to +100°C) • Industrial and Medical Equipment

• Temperature Threshold Set By 1% External • Storage Area Networks

Resistor

• Automotive

• Low Quiescent Current: 40 μA Typical

DESCRIPTION

• Open-Drain, Active-Low Output Stage

The TMP708 is a fully-integrated, resistor-

• Pin-Selectable 10°C or 30°C Hysteresis

programmable temperature switch with a temperature

• Reset Operation Specified at V

= 0.8 V

threshold that is set by just one external resistor

• Supply Range: 2.7 V to 5.5 V

within its entire operating range. The TMP708

provides an open-drain, active-low output and has a

• Package: 5-Pin SOT23

2.7 V to 5.5 V supply voltage range.

The temperature threshold accuracy is typically

±0.5°C with a maximum of ±3°C (+60°C to +100°C).

The quiescent current consumption is typically 40 μA.

Hysteresis is pin-selectable to 10°C or 30°C.

The TMP708 is available in a 5-pin SOT23 package.

TYPICAL APPLICATION

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (14 pages)

PAGE 1
TMP708 SBOS585A – DECEMBER 2011 – REVISED FEBRUARY 2012 www.ti.com Resistor-Programmable Temperature Switch in SOT Package Check for Samples: TMP708 FEATURES APPLICATIONS • • • • • • 1 2 • • • • • • • Threshold Accuracy: – ±0.5°C Typical – ±3°C Maximum (+60°C to +100°C) Temperature Threshold Set By 1% External Resistor Low Quiescent Current: 40 μA Typical Open-Drain, Active-Low Output Stage Pin-Selectable 10°C or 30°C Hysteresis Reset Operation Specified at VCC = 0.8 V Supply Range: 2.7 V to 5.
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TMP708 SBOS585A – DECEMBER 2011 – REVISED FEBRUARY 2012 www.ti.com This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure.
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TMP708 SBOS585A – DECEMBER 2011 – REVISED FEBRUARY 2012 www.ti.com ELECTRICAL CHARACTERISTICS At TA = 0°C to +125°C and VCC = 2.7 V to 5.5 V, unless otherwise noted. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT POWER SUPPLY VCC ICC Supply voltage range Supply current 5.5 V VCC = 5 V 2.7 40 55 µA VCC = 2.7 V 40 55 µA ±3 °C +125 °C TEMPERATURE TE Temperature error TA Operating temperature range ±0.
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TMP708 SBOS585A – DECEMBER 2011 – REVISED FEBRUARY 2012 www.ti.com PIN CONFIGURATION DBV PACKAGE SOT23-5 (TOP VIEW) SET 1 GND 2 OT 3 5 VCC 4 HYST PIN DESCRIPTIONS PIN 4 NAME NO. I/O TYPE DESCRIPTION GND 2 Power Analog Device ground HYST 4 Input Digital Hysteresis selection. For 10°C, HYST = VCC; for 30°C, HYST = GND. OT 3 Output Digital Open-drain, active low output SET 1 Input Analog Temperature set point. Connect an external 1% resistor between SET and GND.
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TMP708 SBOS585A – DECEMBER 2011 – REVISED FEBRUARY 2012 www.ti.com TYPICAL CHARACTERISTICS At TA = +25°C and VCC = 2.7 V to 5.5 V, unless otherwise noted. SUPPLY CURRENT vs TEMPERATURE RSET vs TRIP TEMPERATURE 48 100 VCC = 5 V VCC = 2.7 V 90 80 44 70 RSET (kW) Supply Current (mA) 46 42 40 60 50 40 30 38 20 36 10 RSET = 0 W 34 0 0 20 40 60 80 100 120 140 0 40 60 80 Trip Temperature (°C) Figure 1. Figure 2.
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TMP708 SBOS585A – DECEMBER 2011 – REVISED FEBRUARY 2012 www.ti.com THEORY OF OPERATION DEVICE DESCRIPTION The TMP708 is a fully-integrated, resistor-programmable temperature switch that incorporates two temperature-dependent voltage references and one comparator. One voltage reference exhibits a positive temperature coefficient (tempco), and the other voltage reference exhibits a negative tempco. The temperature at which both voltage references are equal determines the temperature trip point.
PAGE 7
TMP708 SBOS585A – DECEMBER 2011 – REVISED FEBRUARY 2012 www.ti.com APPLICATION INFORMATION SET-POINT RESISTOR (RSET) The temperature threshold is set by connecting RSET from the SET pin to GND. The value of RSET can be determined using either Figure 2 or from Equation 1: RSET (kΩ) = 0.0012T2 – 0.9308T + 96.147 Where T = temperature threshold in degree Celsius. (1) THERMAL CONSIDERATIONS The TMP708 quiescent current is typically 40 μA.
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TMP708 SBOS585A – DECEMBER 2011 – REVISED FEBRUARY 2012 www.ti.com REVISION HISTORY NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Original (December 2011) to Revision A Page • Updated threshold accuracy feature bullet ........................................................................................................................... 1 • Updated threshold accuracy text in second paragraph of Description section .....................
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PACKAGE OPTION ADDENDUM www.ti.
PAGE 10
PACKAGE MATERIALS INFORMATION www.ti.com 18-May-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) TMP708AIDBVR SOT-23 DBV 5 3000 178.0 9.0 TMP708AIDBVT SOT-23 DBV 5 250 178.0 9.0 Pack Materials-Page 1 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 3.23 3.17 1.37 4.0 8.0 Q3 3.23 3.17 1.37 4.0 8.
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PACKAGE MATERIALS INFORMATION www.ti.com 18-May-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TMP708AIDBVR SOT-23 DBV 5 3000 180.0 180.0 18.0 TMP708AIDBVT SOT-23 DBV 5 250 180.0 180.0 18.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.