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preliminary data this is preliminary information on a new product now in deve lopment or undergoing evaluation. details are subject to change without notice. october 2006 rev 6 1/17 1 STLM20 ultra-low current 2.4v precision analog temperature sensor feature summary precision analog voltage output temperature sensor 1.5c temperature accuracy at 25c ultra-low quiescent supply current: 8.0a (max) operating voltage range: 2.4v to 5.5v operating temperature range: ?55c to 130c (grade - 7) ?40c to 85c (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 2/17 contents 1 summary description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 transfer function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3 maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 4 dc and ac characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 5 capacitive load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6 typical operating char acteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7 package mechanical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 8 part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 9 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
STLM20 list of tables 3/17 list of tables table 1. signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 table 2. first order equations optimized for different temperature ranges . . . . . . . . . . . . . . . . . . . . . 7 table 3. quadratic output equation (v cc = 2.7v) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 table 4. quadratic output equation for operations over the whole voltage range (v cc = 2.4v to 5.5v) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 table 5. absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 table 6. dc and ac characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 table 7. resistor/capacitor combinations for the filter network . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 table 8. sot323-5 ? 5-lead small outline transistor package mechanical data. . . . . . . . . . . . . . . . 13 table 9. udfn - 4 lead mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 table 10. ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 table 11. marking description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 table 12. revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
list of figures STLM20 4/17 list of figures figure 1. logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 figure 2. connections (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 figure 3. filter network for noisy environments or capacitive loads > 300pf . . . . . . . . . . . . . . . . . . 11 figure 4. v out vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 figure 5. sot323-5 ? 5-lead small outline transistor package outline . . . . . . . . . . . . . . . . . . . . . . . 13 figure 6. udfn ? 4-lead package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
STLM20 summary description 5/17 1 summary description the STLM20 is a precision analog output temperature sensor for low current applications where maximizing battery life is important. it operates over a ?55c to 130c (grade 7) or ?40c to 85c (grade 9) temperature range. the power supply operating range is 2.4v to 5.5v. the accuracy of the STLM20 is 1.5c, at an ambient temperature of 25c. the temperature error increases linearly and reaches a maximum of 2.5c 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 2.7v to 5.5v, the temperature range extremes are +130c and ?55c. decreasing the power supply voltage to 2.4v changes the negative extreme to ?30c, while the positive remains at +130c. the STLM20 has a maximum quiescent supply current of 8a. 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. 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
summary description STLM20 6/17 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. 1 v cc gnd (2) nc (1) gnd v out ai12253 2 3 5 4 sot323-5(sc70-5) 1 v cc nc (1) gnd v out ai12253_a 2 4 3 udfn-4lead
STLM20 transfer function 7/17 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 25c 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 ?11.79mv/c * t + 1.8528v 1.41 ?40 110 ?11.77mv/c * t + 1.8577v 0.93 ?30 100 ?11.77mv/c * t + 1.8605v 0.70 ?40 85 ?11.67mv/c * t + 1.8583v 0.65 ?10 65 ?11.71mv/c * t + 1.8641v 0.23 35 45 ?11.81mv/c * t + 1.8701v 0.004 20 30 ?11.69mv/c * t + 1.8663v 0.004 v o 11 69mv ? () ct 1 8663 v + ? = v o 388 10 6 ? t 2 ? () 115 ? 10 2 ? t () 1 8639 ++ = t 1481 96 ? 21962 10 6 1 8639 v o ? () 388 10 6 ? ----------------------------------- + + =
transfer function STLM20 8/17 table 3. quadratic output equation (v cc = 2.7v) 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 = ?55c 2.457 2.485 2.512 v t a = ?40c 2.292 2.318 2.343 t a = ?30c 2.181 2.205 2.230 t a = ?20c 2.069 2.092 2.116 t a = 0c 1.842 1.864 1.886 t a = 25c 1.556 1.574 1.592 t a = 50c 1.255 1.279 1.303 t a = 85c 0.833 0.859 0.884 t a = 130c 0.272 0.303 0.335 table 4. quadratic output equation for operations over the whole voltage range (v cc = 2.4v to 5.5v) 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 = ?55c (2) (3) 2. valid for v cc min = 2.7v. 3. valid for temperature grade 7 only. 2.457 2.531 v t a = ?40c (2) 2.292 2.362 t a = ?30c 2.180 2.249 t a = ?20c 2.068 2.135 t a = 0c 1.841 1.904 t a = 25c 1.555 1.610 t a = 50c 1.254 1.322 t a = 85c 0.832 0.903 t a = 130c (3) 0.271 0.353
STLM20 maximum rating 9/17 3 maximum rating 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 implied. exposure to absolute maximum 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 255c to 260c for < 30 seconds (total thermal budget not to exceed 180c for between 90 to 150 seconds). lead solder temperature for 10 seconds 260 c v o output voltage ?0.6 to v cc + 0.6 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 p d power dissipation 377 mw t a (2) 2. grade 7: STLM20dd7f and STLM20w87f grade 9: STLM20dd9f and STLM20w89f. ambient operating temperature grade 7 ?55 to 130 c grade 9 ?40 to 85 c
dc and ac characteristics STLM20 10/17 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 (see table6 on page10 ). 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) 1. valid for ambient operating temperature: t a = ?55 to 130c or t a = ?40 to 85c; v cc = 2.7v (except where noted). min typ (2) 2. t j = t a = 25c. max unit v cc supply voltage t a = ?30c to 130c 2.4 5.5 v t a = ?55c to 130c or ?40c to 85c 2.7 5.5 v v o output voltage t a = 0c 1.8639 v temperature to voltage error (3) v o = (?3.88e?6 * t2) + (?1.15e?2 * t) + 1.8639v 3. error accuracy is between the measured and calculat ed output voltage at specified conditions of voltage, current, and temperature. t a = 25c to 30c 1.5 c t a = 125c to 130c 2.5 c t a = 80c to 85c 2.1 c t a = 0c 1.9 c t a = ?40c 2.3 c t a = ?55c 2.5 c i q quiescent current 2.4v v cc 5.5v 4.8 8 a sensor gain (temperature sensitivity or average slope), v o = ?11.77mv/c * t + 1.860v ?30c t a 100c ?11.4 ?11.77 ?12.2 mv/c non-linearity ?20c t a 80c 0.4 % ? i q change of quiescent current 2.4v v cc 5.5v 0.7 a t c v o temperature coefficient of quiescent current ?11 na/c i sd shutdown current v cc 0.8v 0.02 a z o output impedance 0a i l 16a (4)(5) 4. with negative current flowing into STLM20 and positive current flowing out, can typi cally sink less than 1a and source is 16a. 5. over the supply range of 2.4 to 5.5v. 160 ? regl load regulation (6) 6. measured at constant junction temperature, with pu lse testing and low duty cycle. output changes due to heating may be calculated by multiplying inte rnal dissipation by thermal resistance. ?2.5 mv regi1 line regulation 2.4v v cc 5.0v 3.3 mv/v regi2 5.0v v cc 5.5v 11 mv
STLM20 capacitive load 11/17 5 capacitive load the STLM20 will handle capacitive loads of up to 300pf. 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 1f capacitor, in addition to the output impedance of the device, and a 200 ? series resistor, will provide a low-pass f ilter that will pass t he slow thermal time constant of the STLM20, while filtering the higher frequency noise. figure 3. filter network for noisy environments or capacitive loads > 300pf table 7. resistor/capacitor combinations for the filter network r filter c filter 200 ? 1f 470 ? 0.1f 680 ? 0.01f 1000 ? 1000pf 10k ? 100pf 100k ? 10pf 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
typical operating characteristics STLM20 12/17 6 typical operating characteristics the graph shown in figure 6 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
STLM20 package mechanical 13/17 7 package mechanical in order to meet environmental requirements, st offers these devices in ecopack ? packages. these packages have a lead-free second level interconnect. the category of second level interconnect is marked on the package and on the inner box label, in compliance with jedec standard jesd97. the maximum ratings related to soldering conditions are also marked on the inner box label. ecopack is an st trademark. ecopack specifications are available at: www.st.com. 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 0.004 a2 0.90 ? ? 0.035 ? ? b ? 0.15 0.30 ? 0.006 0.012 c ? 0.10 0.20 ? 0.004 0.008 d 2.00 1.90 2.10 0.079 0.075 0.083 e ? 1.80 2.40 ? 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 ? ? l0.52? ?0.020? ? l1 0.40 0.35 0.45 0.016 0.014 0.018 s?05?05 sot323-5 0.10 c a a2 a1 5x c e1 d e 5x b e b e1 a m 0.10 c a b s s 1 c l1 s l c
package mechanical STLM20 14/17 figure 6. udfn ? 4-lead package outline 1. drawing is not to scale. table 9. udfn - 4 lead 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 part numbering 15/17 8 part numbering table 10. 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) dd= udfn - ultra thin dfn4 lead temperature range 7 = ?55 to 130c (1) 1. contact local sales office for availability 9 = ?40 to 85c shipping method f = ecopack package, tape & reel table 11. marking description part number package marking STLM20w8 sot323-5(sc70) m20 STLM20dd udfn 20
revision history STLM20 16/17 9 revision history table 12. revision history date revision changes 28-jun-2006 1 initial release. 19-jul-2006 2 added table 11: marking description 28-aug-2006 3 added a footnote concerning package availability in feature summary on page 1 and to ta bl e 1 0 and ta b l e 1 1 ; updated package mechanical data in ta b l e 9 05-sep-2006 4 amended text in the feature summary on page 1 , section 1: summary description , section 2: transfer function , ta b l e 6 , and ta bl e 1 0 to elucidate that two packages exist each with specific temperature ranges: sot323-5 (sc70-5) 5-lead package (?55 to 130c) and udfn 4-lead package (?40 to 85c) 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 = 2.7v) and ta b l e 4 : quadratic output equation for ope rations over the whole voltage range (v cc = 2.4v to 5.5v) added. section 6: typical operating characteristics added. t a added to table 5: absolute maximum ratings .
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