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## LM57-Q1 Datasheet(PDF) 29 Page - Texas Instruments

 Part # LM57-Q1 Description Resistor-Programmable Temperature Switch and Analog Temperature Sensor Download 38 Pages Scroll/Zoom 100% Manufacturer TI1 [Texas Instruments] Direct Link http://www.ti.com Logo

## LM57-Q1 Datasheet(HTML) 29 Page - Texas Instruments

 29 / 38 pageJAJADD QDDTEMPL7  7 5 9,  9±9 ,Tªº¬¼GNDSENSE1SENSE2VTEMPTOVERVIA to ground planeVIA to power planeVDDTRIP TESTTOVER0.1 µ FRSENSE1RSENSE2LM57-Q1www.ti.comSNIS191A – JULY 2015 – REVISED JULY 201510.2 Layout ExampleFigure 25. PW (TSSOP) Package Layout Example10.3 Temperature ConsiderationsThe junction temperature of the LM57-Q1 is the actual temperature being measured. The thermal resistancejunction-to-ambient (RθJA) is the parameter (from ) used to calculate the rise of a device junction temperature dueto its power dissipation. Equation 3 is used to calculate the rise in the die temperature of the LM57-Q1.where•TA is the ambient temperature.•IQ is the quiescent current.•IL is the load current on VTEMP.•RθJA can be found in(3)For example using an LM57-Q1 in the PW (TSSOP) package, in an application where TA = 30°C, VDD = 5.5 V,IDD = 28 μA, J5 gain, VTEMP = 2368 mV, and IL = 0 μA, the total temperature rise would be [183°C/W × 5.5 V × 28μA] = 0.028°C. To minimize self-heating, the load current on VTEMP should be minimized.Copyright © 2015, Texas Instruments IncorporatedSubmit Documentation Feedback29Product Folder Links: LM57-Q1

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