for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. general description the max6605 precision, low-power, analog output tem- perature sensor is available in a 5-pin sc70 package. the device has a +2.7v to +5.5v supply voltage range and 10? supply current over the -55? to +125? tem- perature range. for the -40? to +105? temperature range, the supply voltage can go as low as +2.4v. accuracy is ?.75? at t a = +25? and ?? from 0? to +70?. the max6605 output voltage is dependent on its die temperature and has a slope of 11.9mv/? and an off- set of 744mv at 0?. the output typically shows only +0.4? of nonlinearity over the -20? to +85? temper- ature range. ________________________applications cellular phones battery packs gps equipment digital cameras features ? low current consumption (10 a max) ? small sc70 package ? accurate (0.75c at t a = +25c) ? optimized to drive large capacitive loads max6605 low-power analog temperature sensor in sc70 package ________________________________________________________________ maxim integrated products 1 max1106 convst out i/o i/o i/o dout sclk in refin refout in+ gnd 1nf gnd gnd gnd v dd shdn v cc v cc a b v cc cpu max6605 c s = 0.1 f typical application circuit 19-1840; rev 3; 12/09 ordering information pin configuration a b out 15 gnd v cc max6605 sc70 top view 2 34 part temp range pin-package max6605mxk-t -55 c to +125 c 5 sc70-5 max6605mxk+t -55 c to +125 c 5 sc70-5 max6605mxk/v+t -40 c to +85 c 5 sc70-5 + denotes a lead(pb)-free/rohs-compliant package. t = tape and reel. /v denotes an automotive qualified part.
max6605 low-power analog temperature sensor in sc70 package 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v cc = +2.7v to +5.5v, c l = 1nf, t a = -55? to +125?, unless otherwise noted.) (note 1) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. note 1: all parameters are measured at t a = +25?. specifications over temperature range are guaranteed by design. note 2: error (expressed in ?) is defined as the difference between the calculated and measured values of output voltage. guaranteed by design to 5 sigma. v cc to gnd ..............................................................-0.3v to +6v out, a, b to gnd ......................................-0.3v to (v cc + 0.3v) esd protection (human body model) ............................> 2000v current into any pin ............................................................10ma output short-circuit duration.....................................continuous continuous power dissipation (t a = +70?) 5-pin sc70 (derate 3.1mw/? above +70?) ..............245mw operating temperature range .........................-55? to +125? junction temperature ......................................................+150? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? parameter symbol conditions min typ max units t a = +25 c ?.75 t a = -0 c to +70 c -3.0 +3.0 t a = -20 c to +85 c -3.8 +3.8 t a = -40 c to +100 c -5.0 +5.0 temperature error v out = 0.744 + (0.0119 t c) + (1.604 10 -6 t 2 )v (note 2) v cc = +3.3v t a = -55 c to +125 c -5.8 +5.8 c t a = -55 c to +125 c 2.7 5.5 supply voltage v cc t a = -40 c to +105 c 2.4 5.5 v supply current i q no load 4.5 10 ? output voltage v out t a = 0 c 744 mv nonlinearity t a = -20 c to +85 c 0.4 c sensor gain (average slope) t a = -40 c to +100 c 11.1 11.9 12.7 mv/ c capacitive load required for stability 1 nf t a = -20 c to +125 c, i out = -20? to +20? 20 load regulation t a = -55 c, i out = -10? to +10? 20 m c/?
max6605 low-power analog temperature sensor in sc70 package _______________________________________________________________________________________ 3 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 -55 -15 -35 25 565 45 105 85 125 output voltage vs. temperature max6605 toc01 temperature ( c) output voltage (v) -1.3 -0.9 -1.1 -0.5 -0.7 -0.3 -0.1 0.1 0.3 0.5 0.7 1.1 0.9 1.3 1.5 1.7 -55 -15 -35 25 565 45 85 105 125 temperature error vs. temperature max6605 toc02 temperature ( c) temperature error ( c) 0 2 1 4 3 5 6 023 145 supply current vs. supply voltage max6605 toc03 supply voltage (v) supply current ( a) t a = +25 c 0 2 1 4 3 6 5 7 -55 -15 5 -35 25 45 65 85 105 125 supply current vs. temperature max6605 toc04 temperature ( c) supply current ( a) v cc = +5v v cc = +2.4v v cc = +3.3v 1.020 1.025 1.030 1.035 1.040 1.045 1.050 1.055 1.060 02 1 3456 output voltage vs. supply voltage max6605 toc05 supply voltage (v) output voltage (v) t a = +25 c 0 out 500mv/div 1s/div step-response from +25 c to +100 c (fluorinert bath) max6605 toc06 typical operating characteristics (v cc = +3.3v, c s = 0.1?, c l = 1nf, unless otherwise noted.)
detailed description the max6605 analog output temperature sensor? out- put voltage is a linear function of its die temperature. the slope of the output voltage is 11.9mv/?, and there is a 744mv offset at 0? to allow measurement of nega- tive temperatures. the max6605 has three terminals: v cc , gnd, and out. the maximum supply current is 10?, and the supply voltage range is from +2.4v to +5.5v for the -40? to +105? temperature range and +2.7v to +5.5v for the -55? to +125? temperature range. the temperature error is <1? at t a = +25?, <3.8? from t a = -20? to +85?, and <5.8? from t a = -55? to +125?. nonlinearity the benefit of silicon analog temperature sensors over thermistors is linearity over extended temperatures. the nonlinearity of the max6605 is typically 0.4? over the -20? to +85? temperature range. transfer function the temperature-to-voltage transfer function has an approximately linear positive slope and can be described by the equation: v out = 744mv + (t ? 11.9mv/?) where t is the max6605? die temperature in ?. therefore: t (?) = (v out - 744mv) / 11.9mv/? to account for the small amount of curvature in the transfer function, use the equation below to obtain a more accurate temperature reading: v out = 0.744v + 0.0119v/? ? t(?) + 1.604 ? 10 -6 v/? 2 ? (t(?)) 2 applications information sensing circuit board and ambient temperatures temperature sensor ics like the max6605 that sense their own die temperatures must be mounted on, or close to, the object whose temperature they are intend- ed to measure. because there is a good thermal path between the sc70 package? metal leads and the ic die, the max6605 can accurately measure the temper- ature 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 will maxi- mize the heat transfer 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 leads, so the max6605, like all temperature sensors in plastic pack- ages, is less sensitive to the temperature of the surround- ing air than it is to the temperature of its leads. it can be successfully used to sense ambient temperature if the cir- cuit board is designed to track the ambient temperature. as with any ic, the wiring and circuits must be kept insu- lated and dry to avoid leakage and corrosion, especially if the part will be operated at cold temperatures where con- densation can occur. the thermal resistance junction to ambient ( ja ) is the parameter used to calculate the rise of a device junction temperature (t j ) due to its power dissipation. for the max6605, use the following equation to calculate the rise in die temperature: t j = t a + ja ((v cc x i q ) + (v cc - v out ) i out ) the max6605 is a very-low-power temperature sensor and is intended to drive very light loads. as a result, the temperature rise due to power dissipation on the die is insignificant under normal conditions. for example, assume that the max6605 is operating from a +3v sup- ply at +21.6? (v out = 1v) and is driving a 100k load (i out = 10?). in the 5-pin sc70 package, the die tem- perature will increase above the ambient by: t j - t a = ja ((v cc x i q ) + (v cc - v out ) i out ) = 324 c/w x ((3v x 10?) + (3v - 1v) x 10?) = 0.0162 c therefore, the error caused by power dissipation will be negligible. max6605 low-power analog temperature sensor in sc70 package 4 _______________________________________________________________________________________ pin description pin name function 1v cc supply input. decouple with a 0.1? capacitor to gnd. 2 a must be connected to gnd. 3 out temperature sensor output, c l 1nf 4 b must be connected to v cc . 5 gnd ground
max6605 low-power analog temperature sensor in sc70 package _______________________________________________________________________________________ 5 capacitive loads the max6605 can drive unlimited load capacitance. for stable operation load capacitance should be > 1nf. chip information transistor count: 573 package type package code document no. 5 sc70 x5-1 21-0076 package information for the latest package outline information and land patterns, go to www.maxim-ic.com/packages . note that a ?? ?? or ??in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status.
max6605 low-power analog temperature sensor in sc70 package maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it 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 2009 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. revision history revision number revision date description pages changed 0 10/00 initial release 1 8/04 2 11/08 corrected the parameter unit for v out in the transfer function section. 4 3 12/09 added lead-free and automotive-qualified parts to the ordering information table. 1
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