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september 2009 doc id 12495 rev 12 1/18 1 stlm20 ultra-low current 2.4 v precision analog temperature sensor features precision analog voltage output temperature sensor 1.5 c temperature accuracy at 25 c ultra-low quiescent supply current: 8.0 a (max) operating voltage range: 2.4 v to 5.5 v operating temperature range: ?55 c to 130 c (grade - 7) ?40 c to 85 c (grade - 9) sot323-5 (sc70-5) 5-lead package udfn 4-lead package applications third generation (3g) cell phones multimedia pda devices gps devices portable medical instruments voltage-controlled crystal oscillator temperature monitors rf power transistor monitor sot323-5, sc70-5 (w8) udfn 4-lead (dd) www.st.com
contents stlm20 2/18 doc id 12495 rev 12 contents 1 description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 transfer function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3 maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 4 dc and ac characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 5 capacitive load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6 typical operating char acteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 7 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 8 part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 9 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
stlm20 list of tables doc id 12495 rev 12 3/18 list of tables table 1. signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 table 2. first order equations optimized for different temperature ranges . . . . . . . . . . . . . . . . . . . . . 6 table 3. quadratic output equation (v cc = 2.7 v) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 table 4. quadratic output equation for operations over the full voltage range (v cc = 2.4 v to 5.5 v) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 table 5. absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 table 6. dc and ac characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 table 7. resistor/capacitor combinations for the filter network . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 table 8. sot323-5 ? 5-lead small outline transistor package mechanical data. . . . . . . . . . . . . . . . 13 table 9. udfn ? 4-lead package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 table 10. carrier tape dimensions for sot323-5l and udfn-4l packages . . . . . . . . . . . . . . . . . . . 15 table 11. ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 table 12. marking description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 table 13. document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
list of figures stlm20 4/18 doc id 12495 rev 12 list of figures figure 1. logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 figure 2. connections (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 figure 3. filter network for noisy environments or capacitive loads > 300 pf . . . . . . . . . . . . . . . . . . 10 figure 4. v out vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 figure 5. sot323-5 ? 5-lead small outline transistor package outline . . . . . . . . . . . . . . . . . . . . . . . 13 figure 6. udfn ? 4-lead package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 figure 7. carrier tape for sot323-5l and udfn-4lpackages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
stlm20 description doc id 12495 rev 12 5/18 1 description the stlm20 is a precision analog output temperature sensor for low current applications where maximizing battery life is important. it operates over a ?55 c to 130 c (grade 7) or ?40 c to 85 c (grade 9) temperature range. the power supply operating range is 2.4 v to 5.5 v. the accuracy of the stlm20 is 1.5 c, at an ambient temperature of 25 c. the temperature error increases linearly and reaches a maximum of 2.5 c at the temperature range extremes. the temperature range is affected by the power supply voltage. for the temperature grade 7 device, a power supply voltage of 2.7 v to 5.5 v, the temperature range extremes are +130 c and ?55 c. decreasing the power supply voltage to 2.4 v changes the negative extreme to ?30 c, while the positive remains at +130 c. the stlm20 has a maximum quiescent supply current of 8 a. therefore, self-heating is negligible. figure 1. logic diagram 1. pin 2 gnd may be grounded or left floating (sc70-5 onl y). for optimum thermal conductivity to the pc board ground plane, it should be grounded. figure 2. connections (top view) 1. pin 1 nc should be left floating or grounded. 2. pin 2 gnd may be grounded or left floating. for opt imum thermal conductivity to the pc board ground plane, it should be grounded. table 1. signal names v cc supply voltage gnd ground v out output voltage nc no connect ai12252 v cc stlm20 gnd (1) v out 1 v cc gnd (2) nc (1) gnd v out ai1225 3 2 3 5 4 s ot 3 2 3 -5( s c70-5) 1 v cc nc (1) gnd v out ai1225 3 _ a 2 4 3 udfn-4le a d
transfer function stlm20 6/18 doc id 12495 rev 12 2 transfer function the stlm20?s transfer function can be described in different ways, with varying levels of precision. a simple linear transfer function, with good accuracy near 25 c is expressed as: equation 1 over the specified operating temperature range, the best accuracy can be obtained by using the parabolic transfer function: equation 2 and solving for t: equation 3 the best fit linear transfer function for many popular temperature ranges was calculated in ta bl e 2 , where the error introduced by the linear transfer function increases with wider temperature ranges. table 2. first order equations optimized for different temperature ranges temperature range linear equation v o = maximum deviation of linear equation from parabolic equation (c) t min (c) t max (c) ?55 130 ?11.79 mv/c * t + 1.8528 v 1.41 ?40 110 ?11.77 mv/c * t + 1.8577 v 0.93 ?30 100 ?11.77 mv/c * t + 1.8605 v 0.70 ?40 85 ?11.67 mv/c * t + 1.8583 v 0.65 ?10 65 ?11.71 mv/c * t + 1.8641 v 0.23 35 45 ?11.81 mv/c * t + 1.8701 v 0.004 20 30 ?11.69 mv/c * t + 1.8663 v 0.004 v o 11.69mv ? () ct 1.8663 + ? v = v o 3.88 10 6 ? t 2 ? () 1.15 ? 10 2 ? t () 1.8639 ++ = t 1481.96 ? 2.1962 10 6 1.8639 v o ? () 3.88 10 6 ? ---------------------------------- - + + =
stlm20 transfer function doc id 12495 rev 12 7/18 table 3. quadratic output equation (v cc = 2.7 v) parameter conditions min typ max unit temperature error based on: v out = (?3.88e ?6 t 2 ) + (?1.15e ?2 t) + 1.8639 where t is the temperature t a = ?55 c 2.457 2.485 2.512 v t a = ?40 c 2.292 2.318 2.343 t a = ?30 c 2.181 2.205 2.230 t a = ?20 c 2.069 2.092 2.116 t a = 0 c 1.842 1.864 1.886 t a = 25 c 1.556 1.574 1.592 t a = 50 c 1.255 1.279 1.303 t a = 85 c 0.833 0.859 0.884 t a = 130 c 0.272 0.303 0.335 table 4. quadratic output equation for operations over the full voltage range (v cc = 2.4 v to 5.5 v) parameter (1) 1. v out tolerance is 4% (temperature grade 9 only). conditions min max unit temperature error based on: v out = (?3.88e ?6 t 2 ) + (?1.15e ?2 t) + 1.8639, where t is the temperature t a = ?55 c (2)(3) 2. valid for v cc min = 2.7 v. 3. valid for temperature grade 7 only. 2.457 2.531 v t a = ?40 c (2) 2.292 2.362 t a = ?30 c 2.180 2.249 t a = ?20 c 2.068 2.135 t a = 0 c 1.841 1.904 t a = 25 c 1.555 1.610 t a = 50 c 1.254 1.322 t a = 85 c 0.832 0.903 t a = 130 c (3) 0.271 0.353
maximum ratings stlm20 8/18 doc id 12495 rev 12 3 maximum ratings stressing the device above the rating listed in the absolute maximum ratings table may cause permanent damage to the device. these are stress ratings only and operation of the device at these or any other conditions above those indicated in the operating sections of this specification is not imp lied. exposure to absolute ma ximum rating conditions for extended periods may affect device reliability. refer also to the stmicroelectronics sure program and other relevant quality documents. table 5. absolute maximum ratings symbol parameter value unit t stg storage temperature ?65 to +150 c t sld (1) 1. reflow at peak temperature of 260 c. the time above 255 c must not exceed 30 seconds. lead solder temperature for 10 seconds 260 c v o output voltage ?0.3 to v cc + 0.3 v v cc supply voltage ?0.2 to 6.5 v i o output current 10 ma t j(max) maximum junction temperature 150 c ja thermal resistance sot323-5 (sc70-5) 331.4 c/w udfn 160.2 c/w t a (2) 2. grade 7: stlm20w87f, stlm20dd7f grade 9: stlm20dd9f ambient operating temperature grade 7 ?55 to 130 c grade 9 ?40 to 85 c
stlm20 dc and ac characteristics doc id 12495 rev 12 9/18 4 dc and ac characteristics this section summarizes the dc and ac characteristics of the device. the parameters in the dc and ac characteristics table that follows are derived from tests performed under the test conditions. designers should check that the operating conditions in their circuit match the operating conditions when relying on the quoted parameters. table 6. dc and ac characteristics sym description test condition (1) min typ (2) max unit v cc supply voltage t a = ?30 c to 130 c 2.4 5.5 v t a = ?55 c to 130 c or ?40 c to 85 c 2.7 5.5 v v o output voltage t a = 0 c 1.8639 v temperature to voltage error (3) v o = (?3.88e?6 * t2) + (?1.15e?2 * t) + 1.8639 v t a = 25 c to 30 c 1.5 c t a = 125 c to 130 c 2.5 c t a = 80 c to 85 c 2.1 c t a = 0 c 1.9 c t a = ?40 c 2.3 c t a = ?55 c 2.5 c i q quiescent current 2.4v v cc 5.5 v 4.8 8 a sensor gain (temper ature sensitivity or average slope), v o = ?11.77 mv/c * t + 1.860 v ?30 c t a 100 c ?11.4 ?11.77 ?12.2 mv/c non-linearity ?20 c t a 80 c 0.4 % i q change of quiescent current 2.4 v v cc 5.5 v 0.7 a t c v o temperature coeffici ent of quiescent current ?11 na/c i sd shutdown current v cc 0.8 v 0.02 a z o output impedance 0 a i l 16 a (4)(5) 160 regl load regulation (6) ?2.5 mv regi1 line regulation 2.4 v v cc 5.0 v 3.3 mv/v regi2 5.0 v v cc 5.5 v 11 mv 1. valid for ambient operating temperature: t a = ?55 to 130 c or t a = ?40 to 85 c; v cc = 2.7 v (except where noted). 2. t j = t a = 25 c. 3. error accuracy is between the measured and calculated out put voltage at specified conditions of voltage, current, and temperature. 4. with negative current flowing into stlm20 and positive current flowing out, can ty pically sink less than 1 a and source is 16 a. 5. over the supply range of 2.4 to 5.5 v. 6. measured at constant junction temperat ure, with pulse testing and low duty cycl e. output changes due to heating may be calculated by multiplying internal dissipation by thermal resistance.
capacitive load stlm20 10/18 doc id 12495 rev 12 5 capacitive load the stlm20 will handle capacitive loads of up to 300 pf. over the specified temperature range, the stlm20 has a maximum output impedance of 160 . in a noisy environment, it may be advisable to add some filtering to minimize noise in the output voltage. a 0.1f capacitor added between the supply voltage and ground is recommended. in an extremely noisy environment, it may be necessary to add a low-pass filter network to the output of the device. a 1 f capacitor, in addition to the output impedance of the device, and a 200 series resistor, will provide a low-pass filter that will pass the slow thermal time constant of the stlm20, while filtering the higher frequency noise. figure 3. filter network for noisy environments or capacitive loads > 300 pf table 7. resistor/capacitor combinations for the filter network r filter c filter 200 1 f 470 0.1 f 680 0.01 f 1000 1000 pf 10 k 100 pf 100 k 10 pf 1 v cc r filter c filter gnd 0.1f bypass capacitor v out c l ai12259 2 3 5 4 1 v cc r filter c filter gnd 0.1f bypass capacitor v out c l ai12260 2 3 5 4
stlm20 typical operating characteristics doc id 12495 rev 12 11/18 6 typical operating characteristics the graph shown in figure 4 represents v out according to temperature. figure 4. v out vs. temperature 0.00 0.50 1.00 1.50 2.00 2.50 ?50 ?20 10 40 70 100 130 v out (v) temperature (c) typical (v cc = 2.7v) ai13484
package mechanical data stlm20 12/18 doc id 12495 rev 12 7 package mechanical data in order to meet environmental requirements, st offers these devices in different grades of ecopack ? packages, depending on their level of environmental compliance. ecopack ? specifications, grade definitions and product status are available at: www.st.com . ecopack ? is an st trademark.
stlm20 package mechanical data doc id 12495 rev 12 13/18 figure 5. sot323-5 ? 5-lead small outline transistor package outline 1. drawing is not to scale. table 8. sot323-5 ? 5-lead small outline transistor package mechanical data symbol mm inches typ min max typ min max a ? 0.80 1.10 ? 0.031 0.043 a1 ? 0 0.10 ? 0.000 0.004 a2 0.90 0.80 1.00 0.035 0.031 0.039 b ? 0.15 0.30 ? 0.006 0.012 c ? 0.10 0.22 ? 0.004 0.009 d 2.00 1.80 2.20 0.079 0.071 0.087 e 2.10 1.80 2.40 0.083 0.071 0.094 e1 1.25 1.15 1.35 0.049 0.045 0.053 e0.65? ?0.026? ? e1 1.30 ? ? 0.051 ? ? l 0.36 0.26 0.46 0.014 0.010 0.018 < ? 0 8 ? 0 8 7091413_e
package mechanical data stlm20 14/18 doc id 12495 rev 12 figure 6. udfn ? 4-lead package outline note: drawing is not to scale. 7986858 table 9. udfn ? 4-lead package mechanical data symbol mm inches min typ max min typ max a 0.45 0.50 0.55 0.018 0.020 0.022 a1 0 0.025 0.05 0 0.001 0.002 a3 0.119 0.127 0.177 0.0046 0.0050 0.0069 b 0.20 0.25 0.30 0.008 0.010 0.012 d 0.95 1.00 1.05 0.037 0.039 0.041 e 1.25 1.30 1.35 0.049 0.051 0.053 e 0.45 0.50 0.55 0.018 0.020 0.022 l 0.35 0.40 0.45 0.014 0.016 0.018 l1 0.45 0.50 0.55 0.018 0.020 0.022 ddd 0 0.04 0.08 0 0.0016 0.0031
stlm20 package mechanical data doc id 12495 rev 12 15/18 figure 7. carrier tape for sot323-5l and udfn-4lpackages t k 0 p 1 a 0 b 0 p 2 p 0 center line s of cavity w e f d top cover tape u s er direction of feed am0 3 07 3 v1 table 10. carrier tape dimensions for sot323-5l and udfn-4l packages package w d e p 0 p 2 fa 0 b 0 k 0 p 1 tunit bulk qty sot323-5l 8.00 + 0.30 ?0.10 1.50 +0.10/ ?0.00 1.75 0.10 4.00 0.10 2.00 0.10 3.50 0.05 2.25 0.10 2.40 0.10 1.22 0.10 4.00 0.10 0.30 0.05 mm 3000 udfn-4l 8.00 + 0.30 ?0.10 1.50 +0.10/ ?0.00 1.75 0.10 4.00 0.10 2.00 0.10 3.50 0.05 1.25 0.10 1.55 0.10 0.65 0.05 4.00 0.10 0.250 0.05 mm 3000
part numbering stlm20 16/18 doc id 12495 rev 12 8 part numbering table 11. ordering information scheme for other options, or for more information on any aspect of this device, please contact the st sales office nearest you. example: stlm20 dd 9 f device type stlm20 package w8 = sot323-5 (sc70-5) (1) 1. available in temperature grade 7 (?55 to 130 c) only dd= udfn - ultra thin dfn 4-lead (2) 2. available in both temperature grade 7 (?55 to 130 c) and grade 9 (?40 to 85 c) temperature range 7 = ?55 to 130c 9 = ?40 to 85c shipping method f = ecopack ? package, tape & reel table 12. marking description part number package marking stlm20w8 sot323-5 (sc70-5) m20 stlm20dd udfn 20
stlm20 revision history doc id 12495 rev 12 17/18 9 revision history table 13. document revision history date revision changes 28-jun-2006 1 initial release. 19-jul-2006 2 added table 12: marking description 28-aug-2006 3 added a footnote concerning package availability in features on page 1 and to ta b l e 1 1 and ta b l e 1 2 ; updated package mechanical data in ta b l e 9 05-sep-2006 4 amended text in the features on page 1 , section 1: description , section 2: transfer function , ta bl e 6 , and ta b l e 1 1 to elucidate that two packages exist each with specific temperature ranges: sot323- 5 (sc70-5) 5-lead package (?55 to 130 c) and udfn 4-lead package (?40 to 85 c) 25-sep-2006 5 updated operating temperature ranges (now 7 and 9); updated table 6: dc and ac characteristics 10-oct-2006 6 table 3: quadratic output equation (v cc = 2.7 v) and ta bl e 4 : quadratic output equation for operation s over the full voltage range (v cc = 2.4 v to 5.5 v) added. section 6: typical operating characteristics added. t a added to table 5: absolute maximum ratings . 04-dec-2006 7 document status updated to full data sheet; updated text in the title of table 4: quadratic output equation for operations over the full voltage range (v cc = 2.4 v to 5.5 v) ; added footnotes regarding temperature ranges in table 11: ordering information scheme . 08-feb-2007 8 added thermal resistance in table 5: absolute maximum ratings . 09-may-2007 9 modified equation 1 , 2 , and 3 . 26-nov-2007 10 updated footnote 2 in ta b l e 5 ; minor text updates. 07-nov-2008 11 updated figure 6: udfn ? 4-lead package outline to reflect location of pin 1 with respect to the orie ntation of the topside marking; updated figure 5 , ta b l e 5 , 8 , 11 . 10-sep-2009 12 updated ta bl e 5 , text in section 7: package mechanical data ; added tape and reel specifications ( figure 7 and ta bl e 1 0 ); reformatted document.
stlm20 18/18 doc id 12495 rev 12 please read carefully: information in this document is provided solely in connection with st products. stmicroelectronics nv and its subsidiaries (?st ?) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described he rein at any time, without notice. all st products are sold pursuant to st?s terms and conditions of sale. purchasers are solely responsible for the choice, selection and use of the st products and services described herein, and st as sumes no liability whatsoever relating to the choice, selection or use of the st products and services described herein. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. i f any part of this document refers to any third party products or services it shall not be deemed a license grant by st for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoev er of such third party products or services or any intellectual property contained therein. unless otherwise set forth in st?s terms and conditions of sale st disclaims any express or implied warranty with respect to the use and/or sale of st products including without limitation implied warranties of merchantability, fitness for a parti cular purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. unless expressly approved in writing by an authorized st representative, st products are not recommended, authorized or warranted for use in milita ry, air craft, space, life saving, or life sustaining applications, nor in products or systems where failure or malfunction may result in personal injury, death, or severe property or environmental damage. st products which are not specified as "automotive grade" may only be used in automotive applications at user?s own risk. resale of st products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by st for the st product or service described herein and shall not create or extend in any manner whatsoev er, any liability of st. st and the st logo are trademarks or registered trademarks of st in various countries. information in this document supersedes and replaces all information previously supplied. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners. ? 2009 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - philippines - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com

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