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march 2005 1 m9999-031805 lm4040/4041 micrel, inc. lm4040/4041 precision micropower shunt voltage reference general description ideal for space critical applications, the lm4040 and lm4041 precision voltage references are available in the subminiature (3mm 1.3mm) sot-23 surface-mount package. the lm4040 is the available in ?xed reverse breakdown voltages of 2.500v, 4.096v and 5.000v. the lm4041 is avail - able with a ?xed 1.225v or an adjustable reverse breakdown voltage. the minimum operating current ranges from 60a for the lm4041-1.2 to 74a for the lm4040-5.0. lm4040 versions have a maximum operating current of 15ma. lm4041 ver - sions have a maximum operating current of 12ma. the lm4040 and lm4041 have bandgap reference tempera - ture drift curvature correction and low dynamic impedance, ensuring stable reverse breakdown voltage accuracy over a wide range of operating temperatures and currents. data sheets and support documentation can be found on micrels web site at www.micrel.com. features ? small sot-23 package ? no output capacitor required ? tolerates capacitive loads ? fixed reverse breakdown voltages of 1.225, 2.500v, 4.096v and 5.000v ? adjustable reverse breakdown version ? contact micrel for parts with extended temperature range. key speci?cations ? output voltage tolerance ............................. 0.1% (max) ? low output noise (10hz to 100hz) lm4040 ................................................. 35v rms (typ) lm4041 ................................................. 20v rms (typ) ? wide operating current range lm4040 .................................................. 60a to 15ma lm4041 .................................................. 60a to 12ma ? industrial temperature range .................. C40c to +85c ? low temperature coef?cient ................ 100ppm/c (max) applications ? battery-powered equipment ? data acquisition systems ? instrumentation ? process control ? energy management ? product testing ? automotive electronics ? precision audio components typical applications figure 2. lm4041 adjustable shunt regulator application figure 1. lm4040, lm4041 fixed shunt regulator application v o = 1.233 (r 2 /r 1 + 1) micrel, inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? tel + 1 (408) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micrel.com v s r s v r i q + i l i q i l lm4040 lm4041 v o v s lm4041 adjustable r 1 r 2 r s v o
lm4040/4041 micrel, inc. m9999-031805 2 march 2005 pin con?guration example field code _ _ c 3rd character c = 0.5% d = 1.0% x = 0.5% pb-free y = 1.0% pb-free note: if 3rd character is omitted, container will indicate tolerance. example field code _ 2 _ 2nd character 1 = 1.225v 2 = 2.500v 4 = 4.096v 5 = 5.000v a = adjustable example: r2c represents reference, 2.500v, 0.5% (lm4040cim3-2.5) example: y1c represents pb-free, 1.225v, 0.5% (lm4040cym3-1.2) sot-23 package markings example field code r _ _ 1st character r = reference y _ _ 1st character y = pb-free ordering information part number accuracy, standard pb-free voltage temp. coef?cient lm4040cim3-2.5 lm4040cym3-2.5 2.500v 0.5%, 100ppm/c lm4040dim3-2.5 lm4040dym3-2.5 2.500v 1.0%, 150ppm/c lm4040cim3-4.1 lm4040cym3-4.1 4.096v 0.5%, 100ppm/c lm4040dim3-4.1 lm4040dym3-4.1 4.096v 1.0%, 150ppm/c lm4040cim3-5.0 lm4040cym3-5.0 5.000v 0.5%, 100ppm/c lm4040dim3-5.0 lm4040dym3-5.0 5.000v 1.0%, 150ppm/c lm4041cim3-1.2 lm4041cym3-1.2 1.225v 0.5%, 100ppm/c lm4041dim3-1.2 lm4041dym3-1.2 1.225v 1.0%, 150ppm/c lm4041cim3-adj lm4041cym3-adj 1.24v to 10v 0.5%, 100ppm/c lm4041dim3-adj lm4041dym3-adj 1.24v to 10v 1.0%, 150ppm/c fixed v ersion sot -23 (m3) package 3 pin 3 must float or be connected to pin 2. adjustable v ersion sot -23 (m3) package 1 2 3 C fb +
march 2005 3 m9999-031805 lm4040/4041 micrel, inc. absolute maximum ratings reverse current ......................................................... 20ma forward current ......................................................... 10ma maximum output voltage lm4041-adjustable .................................................... 15v power dissipation at t a = 25c ( note 2) ................ 306mw storage temperature ................................ C65c to +150c lead temperature vapor phase (60 seconds) ............................... +215c infrared (15 seconds) ....................................... +220c esd susceptibility human body model ( note 3) ............................... 2kv machine model ( note 3) .................................... 200v operating ratings (notes 1 and 2) temperature range (t min t a t max ) ............................ C40c t a +85c reverse current lm4040-2.5 ............................................ 60a to 15ma lm4040-4.1 ............................................ 68a to 15ma lm4040-5.0 ............................................ 74a to 15ma lm4041-1.2 ............................................ 60a to 12ma lm4041-adj .......................................... 60a to 12ma output voltage range lm4041-adj ............................................ 1.24v to 10v functional diagram lm4040, lm4041 fixed functional diagram lm4041 adjustable note 1. absolute maximum ratings indicate limits beyond which damage to the device may occur. operating ratings indicate conditions for which the device is functional, but do not guarantee speci?c performance limits. for guaranteed speci?cation and test conditions, see the electrical characteristics . the guaranteed speci?cations apply only for the test conditions listed. some performance characteristics may degrade when the device is not operated under the listed test conditions. note 2. the maximum power dissipation must be derated at elevated temperatures and is dictated by t jmax (maximum junction temperature), ja (junction to ambient thermal resistance), and t a (ambient temperature). the maximum allowable power dissipation at any temperature is pd - max = (t jmax C t a )/ ja or the number given in the absolute maximum ratings, whichever is lower. for the lm4040 and lm4041, t jmax = 125c, and the typical thermal resistance ( ja ), when board mounted, is 326c/w for the sot-23 package. note 3. the human body model is a 100pf capacitor discharged through a 1.5k resistor into each pin. the machine model is a 200pf capacitor discharged directly into each pin. + + fb v ref
lm4040/4041 micrel, inc. m9999-031805 4 march 2005 lm4040-2.5 electrical characteristics (note 4) boldface limits apply for t a = t j = t min to t max ; all other limits t a = t j = 25c. the grades c and d designate initial reverse break - down voltage tolerance of 0.5% and 1.0 respectively. lm4040cim3 lm4040dim3 symbol parameter conditions typical units (note 5) limits limits (limit) (note 6) (note 6) v r reverse breakdown voltage i r = 100a 2.500 v reverse breakdown voltage i r = 100a 12 25 mv (max) tolerance (note 7) 29 49 mv (max) i rmin minimum operating current 45 a 60 65 a (max) 65 70 a (max) v r /t average reverse breakdown i r = 10ma 20 ppm/c voltage temperature i r = 1ma 15 100 150 ppm/c (max) coef?cient i r = 100a 15 ppm/c (max) v r /i r reverse breakdown voltage i rmin i r 1ma 0.3 mv change with operating 0.8 1.0 mv (max) current change 1.0 1.2 mv (max) 1ma i r 15ma 2.5 mv 6.0 8.0 mv (max) 8.0 10.0 mv (max) z r reverse dynamic impedance i r = 1ma, f = 120hz 0.3 i ac = 0.1 i r 0.9 1.1 (max) e n wideband noise i r = 100a 10hz f 10khz 35 v rms v r reverse breakdown voltage t = 1000hrs long term stability t = 25c 0.1c 120 ppm i r = 100a note 4. speci?cation for packaged product only. note 5. typicals are at t j = 25c and represent most likely parametric norm. note 6. limits are 100% production tested at 25c. limits over temperature are guaranteed through correlation using statistical quality control (sql) methods. note 7. the boldface (over temperature limit for reverse breakdown voltage tolerance is de?ned as the room temperature reverse breakdown volt - age tolerance [(v r /t)(65c)(v r )]. v r /t is the v r temperature coef?cient, 65c is the temperature range from C40c to the reference point of 25c, and v r is the reverse breakdown voltage. the total over temperature tolerance for the different grades follows: c-grade: 1.15% = 0.5% 100ppm/c 65c d-grade: 1.98% = 1.0% 150ppm/c 65c example: the c-grade lm4040-2.5 has an over temperature reverse breakdown voltage tolerance of 2.5 1.15% = 29mv.
march 2005 5 m9999-031805 lm4040/4041 micrel, inc. lm4040-4.1 electrical characteristics (note 4) boldface limits apply for t a = t j = t min to t max ; all other limits t a = t j = 25c. the grades c and d designate initial reverse break - down voltage tolerance of 0.5% and 1.0% respectively. lm4040cim3 lm4040dim3 symbol parameter conditions typical units (note 5) limits limits (limits) (note 6) (note 6) v r reverse breakdown voltage i r = 100a 4.096 v reverse breakdown voltage i r = 100a 20 41 mv (max) tolerance (note 7) 47 81 mv (max) i rmin minimum operating current 50 a 68 73 a (max) 73 78 a (max) v r /t average reverse breakdown i r = 10ma 30 ppm/c voltage temperature i r = 1ma 20 100 150 ppm/c (max) coef?cient i r = 100a 20 ppm/c (max) v r /i r reverse breakdown voltage i rmin i r 1ma 0.5 mv change with operating 0.9 1.2 mv (max) current change 1.2 1.5 mv (max) 1ma i r 15ma 3.0 mv 7.0 9.0 mv (max) 10.0 13.0 mv (max) z r reverse dynamic impedance i r = 1ma, f = 120hz 0.5 i ac = 0.1 i r 1.0 1.3 (max) e n wideband noise i r = 100a 10hz f 10khz 80 v rms v r reverse breakdown voltage t = 1000hrs long term stability t = 25c 0.1c 120 ppm i r = 100a note 4. speci?cation for packaged product only. note 5. typicals are at t j = 25c and represent most likely parametric norm. note 6. limits are 100% production tested at 25c. limits over temperature are guaranteed through correlation using statistical quality control (sql) methods. note 7. the boldface (over temperature limit for reverse breakdown voltage tolerance is de?ned as the room temperature reverse breakdown volt - age tolerance [(v r /t)(65c)(v r )]. v r /t is the v r temperature coef?cient, 65c is the temperature range from C40c to the reference point of 25c, and v r is the reverse breakdown voltage. the total over temperature tolerance for the different grades follows: c-grade: 1.15% = 0.5% 100ppm/c 65c d-grade: 1.98% = 1.0% 150ppm/c 65c example: the c-grade lm4040-2.5 has an over temperature reverse breakdown voltage tolerance of 2.5 1.15% = 29mv.
lm4040/4041 micrel, inc. m9999-031805 6 march 2005 lm4040-5.0 electrical characteristics (note 4) boldface limits apply for t a = t j = t min to t max ; all other limits t a = t j = 25c. the grades c and d designate initial reverse break - down voltage tolerance of 0.5% and 1.0% respectively. lm4040cim3 lm4040dim3 symbol parameter conditions typical units (note 5) limits limits (limits) (note 6) (note 6) v r reverse breakdown voltage i r = 100a 5.000 v reverse breakdown voltage i r = 100a 25 50 mv (max) tolerance (note 7) 58 99 mv (max) i rmin minimum operating current 54 a 74 79 a (max) 80 85 a (max) v r /t average reverse breakdown i r = 10ma 30 ppm/c voltage temperature i r = 1ma 20 100 150 ppm/c (max) coef?cient i r = 100a 20 ppm/c (max) v r /i r reverse breakdown voltage i rmin i r 1ma 0.5 mv change with operating 1.0 1.3 mv (max) current change 1.4 1.8 mv (max) 1ma i r 15ma 3.5 mv 8.0 10.0 mv (max) 12.0 15.0 mv (max) z r reverse dynamic impedance i r = 1ma, f = 120hz 0.5 i ac = 0.1 i r 1.1 1.5 (max) e n wideband noise i r = 100a 10hz f 10khz 80 v rms v r reverse breakdown voltage t = 1000hrs long term stability t = 25c 0.1c 120 ppm i r = 100a note 4. speci?cation for packaged product only. note 5. typicals are at t j = 25c and represent most likely parametric norm. note 6. limits are 100% production tested at 25c. limits over temperature are guaranteed through correlation using statistical quality control (sql) methods. note 7. the boldface (over temperature limit for reverse breakdown voltage tolerance is de?ned as the room temperature reverse breakdown volt - age tolerance [(v r /t)(65c)(v r )]. v r /t is the v r temperature coef?cient, 65c is the temperature range from C40c to the reference point of 25c, and v r is the reverse breakdown voltage. the total over temperature tolerance for the different grades follows: c-grade: 1.15% = 0.5% 100ppm/c 65c d-grade: 1.98% = 1.0% 150ppm/c 65c example: the c-grade lm4040-2.5 has an over temperature reverse breakdown voltage tolerance of 2.5 1.15% = 29mv.
march 2005 7 m9999-031805 lm4040/4041 micrel, inc. lm4040 typical characteristics test circuit v in 1hz rate lm4040 r s v r
lm4040/4041 micrel, inc. m9999-031805 8 march 2005 lm4041-1.2 electrical characteristics (note 4) boldface limits apply for t a = t j = t min to t max ; all other limits t a = t j = 25c. the grades c and d designate initial reverse break - down voltage tolerance of 0.5% and 1.0%, respectively. lm4041cim3 symbol parameter conditions typical units (note 5) limits (limit) (note 6) v r reverse breakdown voltage i r = 100a 1.225 v reverse breakdown voltage i r = 100a 6 mv (max) tolerance (note 7) 14 mv (max) i rmin minimum operating current 45 a 60 a (max) 65 a (max) v r /t average reverse breakdown i r = 10ma 20 ppm/c voltage temperature i r = 1ma 15 100 ppm/c (max) coef?cient i r = 100a 15 ppm/c (max) v r /i r reverse breakdown voltage i rmin i r 1ma 0.7 mv change with operating 1.5 mv (max) current change 2.0 mv (max) 1ma i r 15ma 4.0 mv 6.0 mv (max) 8.0 mv (max) z r reverse dynamic impedance i r = 1ma, f = 120hz 0.5 i ac = 0.1 i r 1.5 (max) e n wideband noise i r = 100a 10hz f 10khz 20 v rms v r reverse breakdown voltage t = 1000hrs long term stability t = 25c 0.1c 120 ppm i r = 100a note 4. speci?cation for packaged product only. note 5. typicals are at t j = 25c and represent most likely parametric norm. note 6. limits are 100% production tested at 25c. limits over temperature are guaranteed through correlation using statistical quality control (sql) methods. note 7. the boldface (over temperature limit for reverse breakdown voltage tolerance is de?ned as the room temperature reverse breakdown volt - age tolerance [(v r /t)(65c)(v r )]. v r /t is the v r temperature coef?cient, 65c is the temperature range from C40c to the reference point of 25c, and v r is the reverse breakdown voltage. the total over temperature tolerance for the different grades follows: c-grade: 1.15% = 0.5% 100ppm/c 65c d-grade: 1.98% = 1.0% 150ppm/c 65c example: the c-grade lm4040-2.5 has an over temperature reverse breakdown voltage tolerance of 2.5 1.15% = 29mv.
march 2005 9 m9999-031805 lm4040/4041 micrel, inc. lm4041-1.2 electrical characteristics (note 4) boldface limits apply for t a = t j = t min to t max ; all other limits t a = t j = 25c. the grades c and d designate initial reverse break - down voltage tolerance of 0.5% and 1.0%, respectively. lm4041dim3 typical limits units symbol parameter conditions (note 5) (note 6) (limit) v r reverse breakdown voltage i r = 100a 1.225 v reverse breakdown voltage i r = 100a 12 mv (max) tolerance (note 7) 24 mv (max) i rmin minimum operating current 45 a 65 a (max) 70 a (max) v r /t average reverse breakdown i r = 10ma 20 ppm/c voltage temperature i r = 1ma 15 150 ppm/c (max) coef?cient i r = 100a 15 ppm/c (max) v r /i r reverse breakdown voltage i rmin i r 1ma 0.7 mv change with operating 2.0 mv (max) current change 2.5 mv (max) 1ma i r 15ma 2.5 mv 8.0 mv (max) 10.0 mv (max) z r reverse dynamic impedance i r = 1ma, f = 120hz 0.5 i ac = 0.1 i r 2.0 (max) e n wideband noise i r = 100a 10hz f 10khz 20 v rms v r reverse breakdown voltage t = 1000hrs long term stability t = 25c 0.1c 120 ppm i r = 100a note 4. speci?cation for packaged product only. note 5. typicals are at t j = 25c and represent most likely parametric norm. note 6. limits are 100% production tested at 25c. limits over temperature are guaranteed through correlation using statistical quality control (sql) methods. note 7. the boldface (over temperature limit for reverse breakdown voltage tolerance is de?ned as the room temperature reverse breakdown volt - age tolerance [(v r /t)(65c)(v r )]. v r /t is the v r temperature coef?cient, 65c is the temperature range from C40c to the reference point of 25c, and v r is the reverse breakdown voltage. the total over temperature tolerance for the different grades follows: c-grade: 1.15% = 0.5% 100ppm/c 65c d-grade: 1.98% = 1.0% 150ppm/c 65c example: the c-grade lm4040-2.5 has an over temperature reverse breakdown voltage tolerance of 2.5 1.15% = 29mv.
lm4040/4041 micrel, inc. m9999-031805 10 march 2005 lm4041-adjustable electrical characteristics (note 4) boldface limits apply for t a = t j = t min to t max ; all other limits t j = 25c unless otherwise speci?ed (sot-23, see note 8), i rmin i r < 12ma, v ref v out 10v. the grades c and d designate initial reverse breakdown voltage tolerance of 0.5% and 1%, respectively for v out = 5v. lm4041cim3 lm4041dim3 symbol parameter conditions typical units (note 5) limits limits (limit) (note 6) (note 6) v ref reference breakdown voltage i r = 100a 1.233 v v out = 5v reference breakdown voltage i r = 100a 6.2 12 mv (max) tolerance (note 9) 14 24 mv (max) i rmin minimum operating current 45 a 60 65 a (max) 65 70 a (max) v ref reference voltage i rmin i r 1ma 0.7 mv /i r change with operating sot-23: 1.5 2.0 mv (max) current change v out 1.6v 2.0 2.5 mv (max) (note 8) 1ma i r 15ma 2 mv sot-23: 4 6 mv (max) v out 1.6v 6 8 mv (max) (note 8) v ref reference voltage change i r = 1ma C1.55 mv/v /v o with output voltage change C2.0 C2.5 mv/v (max) C2.5 C3.0 mv/v (max) i fb feedback current 60 na 100 150 na (max) 120 200 na (max) v ref average reference v out = 5v /t voltage temperature i r = 10ma 20 ppm/c coef?cient i r = 1ma 15 100 150 ppm/c (max) (note 9) i r = 100a 15 ppm/c (max) z out dynamic output impedance i r = 1ma, f = 120hz i ac = 0.1 i r v out = v ref 0.3 v out = 10v 2 (max) e n wideband noise i r = 100a 10hz f 10khz 20 v rms v ref reference voltage t = 1000hrs long term stability t = 25c 0.1c 120 ppm i r = 100a note 4. speci?cation for packaged product only. note 5. typicals are at t j = 25c and represent most likely parametric norm. note 6. limits are 100% production tested at 25c. limits over temperature are guaranteed through correlation using statistical quality control (sql) methods. note 7. the boldface (over temperature limit for reverse breakdown voltage tolerance is de?ned as the room temperature reverse breakdown volt - age tolerance [(v r /t)(65c)(v r )]. v r /t is the v r temperature coef?cient, 65c is the temperature range from C40c to the reference point of 25c, and v r is the reverse breakdown voltage. the total over temperature tolerance for the different grades follows: c-grade: 1.15% = 0.5% 100ppm/c 65c d-grade: 1.98% = 1.0% 150ppm/c 65c example: the c-grade lm4040-2.5 has an over temperature reverse breakdown voltage tolerance of 2.5 1.15% = 29mv. note 8. when v out 1.6v, the lm4041-adj must operate at reduced i r . this is caused by the series resistance of the die attach between the die (C) output and the package (C) output pin. see the output saturation curve in the typical performance characteristics section. note 9. reference voltage and temperature coef?cient will change with output voltage. see typical performance characteristics curves.
march 2005 11 m9999-031805 lm4040/4041 micrel, inc. test circuit lm4041 typical characteristics r s 30k v in 1hz rate lm4041-1. 2 v r
lm4040/4041 micrel, inc. m9999-031805 12 march 2005 lm4041 typical characteristics * output impedance vs. freq. test circuit ? large signal response test circuit ? reverse characteristics test circuit * output impedance measurement.. ? reverse characteristics measurement. ? large signal response measurement. C + c l 120k fb i r fb 2v te v out i r + C lm4041-adj v v ou t lm4041-adj + fb C 100k inut + 15v 5.1k
march 2005 13 m9999-031805 lm4040/4041 micrel, inc. applications information the stable operation of the lm4040 and lm4041 references requires an external capacitor greater than 10nf connected between the (+) and (C) pins. bypass capacitors with values between 100pf and 10nf have been found to cause the devices to exhibit instabilities. schottky diode lm4040-x.x and lm4041-1.2 in the sot-23 package have a parasitic schottky diode between pin 2 (C) and pin 3 (die attach interface connect). pin 3 of the sot-23 package must ?oat or be connected to pin 2. lm4041-adjs use pin 3 as the (C) output. conventional shunt regulator in a conventional shunt regulator application (see figure 1), an external series resistor (r s ) is connected between the supply voltage and the lm4040-x.x or lm4041-1.2 reference. r s determines the current that ?ows through the load (i l ) and the reference (i q ). since load current and supply volt - age may vary, r s should be small enough to supply at least the minimum acceptable i q to the reference even when the supply voltage is at its minimum and the load current is at its maximum value. when the supply voltage is at its maxi - mum and i l is at its minimum, r s should be large enough so that the current ?owing through the lm4040-x.x is less than 15ma, and the current ?owing through the lm4041-1.2 or lm4041-adj is less than 12ma. r s is determined by the supply voltage (v s ), the load and operating current, (i l and i q ), and the references reverse breakdown voltage (v r ): r s = (v s C v r ) / (i l + i q ) adjustable regulator the lm4041-adjs output voltage can be adjusted to any value in the range of 1.24v through 10v. it is a function of the internal reference voltage (v ref ) and the ratio of the ex - ternal feedback resistors as shown in figure 2. the output is found using the equation: (1) v o = v ref [ (r2/r1) + 1 ] where v o is the desired output voltage. the actual value of the internal v ref is a function of v o . the corrected v ref is determined by: (2) v ref = v o (v ref / v o ) + v y where v o is the desired output voltage. v ref / v o is found in the electrical characteristics and is typically C1.3mv/v and v y is equal to 1.233v. replace the value of v ref in equation (1) with the value v ref found using equation (2). note that actual output voltage can deviate from that pre - dicted using the typical v ref / v o in equation (2); for c- grade parts, the worst-case v ref / v o is C2.5mv/v and v y = 1.248v. the following example shows the difference in output volt - age resulting from the typical and worst case values of v ref / v o . let v o = +9v. using the typical values of v ref /v o , v ref is 1.223v. choosing a value of r1 = 10k, r2 = 63.272k. using the worst case v ref / v o for the c-grade and d- grade parts, the output voltage is actually 8.965v and 8.946v respectively. this results in possible errors as large as 0.39% for the c-grade parts and 0.59% for the d-grade parts. once again, resistor values found using the typical value of v ref / v o will work in most cases, requiring no further adjustment. figure 4. voltage level detector figure 3. voltage level detector typical application circuits r1 120k r2 1m fb + C lm4041-adj d1 < C 12 v led on r3 200 C 5v d1 lm4041- ad j r1 120k r2 1m fb C + r3 330 > C12v led on C5 v
lm4040/4041 micrel, inc. m9999-031805 14 march 2005 figure 8. bidirectional adjustable clamp 2.4 to 6v figure 7. bidirectional adjustable clamp 18v to 2.4v * d1 can be any led, v f = 1.5v to 2.2v at 3ma. d1 may act as an indicator. d1 will be on if i threshold falls below the threshold current, except with i = o. figure 9. floating current detector figure 6. bidirectional clamp 2.4v figure 5. fast positive clamp 2.4v + ? v d1 v in v out d1 1n914 d2 1n914 r3 240k r4 240k r1 i r2 50a lm4041-adj fb + C d1 1n457 r3 510k lm4041-adj d2 1n457 v out r2 510k v in r1 i + fb fb lm4041-adj + C C v in r1 r2 390k r3 500k fb + C lm4041-adj d1 1n457 r4 390k d2 1n457 lm4041-adj fb + C i v ou t v in r1 i lm4041-adj d2 1n457 r3 1m r2 330k v out lm4041-adj fb + C fb C + d1 1n457 r4 330k 0 to 20ma r1 390 2% 1n4002 d2 lm4041-adj + C fb l d1* 1 2 3 6 5 4 4n28 n.c. i threshold = + = 3.2m a 1.24 v r1 5a 4n28 ga in n.c. r2 470k cmos + 5v
march 2005 15 m9999-031805 lm4040/4041 micrel, inc. figure 10. current source * d1 can be any led, v f = 1.5v to 2.2v at 3ma. d1 may act as an indicator. d1 will be on if i threshold falls below the threshold current, except with i = o. figure 11. precision floating current detector +5v r3 100k cmos r4 10m 1 2 3 6 5 4 4n28 n.c. r2 22k lm4041-adj + C r1 332 ? 1 % fb 1n91 4 2n2222 d1 * i threshold = = 3.7m a 2% 1.24v r1 d2 1n4002 0 to 20 ma +15v r1 2n2905 2n 3964 r2 120k lm4041-adj fb + C 1.24v r1 i ou t = 1a < i ou t = 100m a
lm4040/4041 micrel, inc. m9999-031805 16 march 2005 package information sot-23 (m3) micrel inc. 2180 fortune drive san jose, ca 95131 usa tel + 1 (408) 944-0800 fax + 1 (408) 474-1000 web http://www.micrel.com this information furnished by micrel in this data sheet is believed to be accurate and reliable. however no responsibility is assumed by micrel for its use. micrel reserves the right to change circuitry and speci?cations at any time without noti?cation to the customer. micrel products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a signi? cant injury to the user. a purchaser's use or sale of micrel products for use in life support appliances, devices or systems is a purchaser's own risk and purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 2004 micrel incorporated

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