1 date: 11/29/04 spx2931 100ma low dropout voltage regulator ?copyright 2004 sipex corporation 100ma low dropout voltage regulator spx2931 description features 3.3v and 3.5v versions output current in excess of 100 ma input-output differential is 0.3 at 100ma mirror-image insertion protection internal thermal protection available in to-92 and sot-89 packages improved version of the industry standard lm2931 reverse battery, internal short circuit, 20v reverse transient and 60v load dump protection availiable with either 2% or 3% output accurancy at 25 c the spx2931 is a low power, positive voltage regulator. this device is an excellent choice for use in battery-powered applications such as cordless telephones, radio control systems, and portable computers. the spx2931 features offers very low quiescent currents (0.4 ma), and very low drop output voltage (50 mv at light load and 300 mv at 100 ma). the spx2931 is offered in a 3-pin to-92, and sot-89 package. applications portable instrumentation cordless telephones radio control systems typical applications circuit now available in lead free packaging spx2931 v in c 1 v out 1 f 100 f, esr 0.05 to 0.6 ohms gnd bottom view to-92 (n) sot-89 (m1) t op view 1 2 3 v in gnd v out 13 2 gnd v in v out
2 date: 11/29/04 spx2931 100ma low dropout voltage regulator ?copyright 2004 sipex corporation parameter conditions min typ max min typ max units 3.3v version output voltage (note 2) 4v < v in <26v, 3.234 3.300 3.366 3.201 3.300 3.399 i o = 100 ma over temp. v 3.201 3.300 3.399 3.135 3.300 3.465 3.5v version output voltage (note 2) 4.5v < v in < 26v, 3.430 3.500 3.570 3.395 3.500 3.605 i o = 100ma over temp. v 3.395 3.500 3.605 3.325 3.500 3.675 all voltage options long term stability 20 20 mv/1000hr line regulation 9v -0.3v, r l = 500 ? -15 -30 -15 -30 v voltage, dc reverse polarity input 1% duty cycle, <100ms -50 -80 -50 -80 v voltage, transient r l =500 ? absolute maximum ratings power dissipation (note 3) ........................................ internally limited lead temp (soldering, 5 seconds) ............................................ 260 c storage temperature range ..................................... -65 c to +150 c input supply voltage range ............................................. -0.3 to +30v esd rating (note 4) ...................................................................... 2kv notes: note 1: see typical aplications notes to ensure constant junction temperature, low duty cycle pulse testing used. note 2: all limits are at 25 c or over the full operationg junction temperature range of -40 c to +125 c. note 3: the maximum power dissipation is a function of maximum junction temperature, total thermal resistance, and ambient tem perature. note 4: human body model, 100pf discharged through 1.5k ? . at v in =6v, t a = 25 c, i o = 10 ma, c out = 100 f, unless otherwise specified. (note 1) recommended operating consitions input voltage range ........................................................... 3.0 to 26v operating junction temperature range ..................... -40 c to 125 c to-92 ja ............................................................................... 160 c/w sot-89 ja ............................................................................ 110 c/w electrical characteristics
3 date: 11/29/04 spx2931 100ma low dropout voltage regulator ?copyright 2004 sipex corporation figure 1. quiescent current figure 2. quiescent current figure 3. dropout voltage figure 4. dropout voltage figure 5. peak output current figure 6. low voltage behavior 25 6 4 0 -40 0 80 120 junction temperature ( c) quiescent current (ma) 10 15 20 2 ~ ~ ~ ~ 40 i o = 0ma i o = 50ma i o = 100ma quiescent current (ma) 0 0 output current (ma) 30 60 90 5 10 15 20 25 30 v in = 14v input output differential (v) 0.6 0.5 0.2 0 junction temperature (?) 0.4 0.3 0.1 0 40 80 120 i o = 100ma i o = 50ma i o = 10ma input output differential (v) 0.4 0.2 output current (ma) 0.3 0.1 0 0 50 100 0.5 0.6 output current (ma) 800 500 0 input voltage (v) 200 100 10 20 300 400 30 0 t j = 25? t j = 85? t j = -40? 6.0 3.0 2.0 1.0 2.0 3.0 4.0 5.0 6.0 input voltage (v) output voltage (v) 4.0 5.0 spx2931 3.5 i o = 100 ma typical performance characteristics
4 date: 11/29/04 spx2931 100ma low dropout voltage regulator ?copyright 2004 sipex corporation figure 7. maximum power dissipation (sot89) figure 8. maximum power dissipation (to-92) figure 9. output impedance figure 10. operation during load dump application information the spx2931 requires an output capacitor for device stability. the value required varies greatly depending upon the application circuit and other factors. the high frequency characteristics of electrolytic capacitors depend greatly on the type and also on the manufacturer. sometimes bench testing is the only means to determine the proper capacitor type and value. the high qual- ity 100 f aluminum electrolytic covers all gen- eral application circuits, this stability can be obtained with a tantalum electrolytic value of 47 f. another critical point of electrolytic character- istics is its performance over temperature. the spx2931 is designed to operate starting at - 40 c which may not be true in the case of electrolytic. higher temperatures generally no problem. the electrolytic. type in aluminum will freeze around -30 c. this could cause an oscillation at output of regulator. at a lower temperature requirement by many applications the capacitor should maintain its performance. so as a result, for an application which regulator junction temperature does not exceed 25 c, the output capacitor can be reduced by the factor of two over the value needed for the entire tem- perature range. 0.0 010 20 40 70 80 ambient temperature (?) power dissipation (w) 30 50 60 90 0.4 0.8 1.2 1.6 2.0 1.0 0 20 40 50 60 ambient temperature (?) power dissipation (w) 0.9 0.8 0.7 0.6 0.5 0.4 0.1 0.3 0.2 0 10 30 70 80 90 0.125" lead length from pc board 0.4" length from pc board operation during load dump time (ms) output voltage (v) 400 200 100 -100 30 10 0 6 4 -2 2 0 0 300 ~ ~ 20 40 50 60 70 500 output voltage (v) ~ ~ c o = 100 f r l = 500 ? 10 1 0.1 0 30 60 90 120 150 frequency (hz) 0.01 output impedance ( ? ) lm2931- 5.0 i o = 10ma typical performance characteristics
5 date: 11/29/04 spx2931 100ma low dropout voltage regulator ?copyright 2004 sipex corporation in most applications the spx2931 is operating at few milliamps. in these applications the out- put capacitance can be further reduced. for example, when the regulator is running at 10ma output current the output capacitance value is half compared to the same regulator that is running at 100 ma. the value decreases with higher output voltages, since the internal loop gain is reduced. the worst case occurs at the lower temperature and maximum operating currents, the entire circuit and the electrolytic, should be cooled down to the minimum temperature. the mini- mum of 0.6 volts required at the input of regula- tor above the output to keep the power dissipa- tion and die heating to its minimum. after the value for the capacitor has been determined for actual use, the value should be doubled. typical performance characteristics package pinouts bottom view to-92 (n) sot-89 (m1) t op view 1 2 3 v in gnd v out 13 2 gnd v in v out
6 date: 11/29/04 spx2931 100ma low dropout voltage regulator ?copyright 2004 sipex corporation package: 3pin to-92 d w l e1 e b a s1 a (2x) e r symbol min nom max a0.17- 0.195 b0. 014 - 0.02 e0.13- 0.155 e0.95- 0.105 e1 0.045 - 0.055 l0.5-0 .61 r0. 085 - 0.095 s1 0.045 - 0.06 w0. 016 - 0.022 d0. 175 - 0.195 a4o-6o note: dimensions in (inches) 3 pin to-92
7 date: 11/29/04 spx2931 100ma low dropout voltage regulator ?copyright 2004 sipex corporation package: 3pin sot-89 h e e e1 d d1 1 2 3 1.0 c 5?2x) bb1 b ro.15 8?2x) l symbol min nom max b0 .36 0.42 0.48 l0.8 -1.2 b1 0.41 0.47 0.53 c0 .38 0.4 0.43 d4.44. 54.6 d1 1.4 1.6 1.75 h3 .94 - 4.25 e2.42. 52.6 e1 .45 1.5 1.55 e1 2.9 3 3.1 note: dimensions in (mm) 3 pin sot-89
8 date: 11/29/04 spx2931 100ma low dropout voltage regulator ?copyright 2004 sipex corporation corporation analog excellence sipex corporation reserves the right to make changes to any products described herein. sipex does not assume any liability aris ing out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor t he rights of others. sipex corporation headquarters and sales office 233 south hillview drive milpitas, ca 95035 tel: (408) 934-7500 fax: (408) 935-7600 ordering information part number acc. output voltage package spx2931am1-3.3 2% 3.3v 3 lead sot-89 spx2931am1-3.3/tr 2% 3.3v 3 lead sot-89 spx2931am1-3.5 2% 3.5v 3 lead sot-89 spx2931am1-3.5/tr 2% 3.5v 3 lead sot-89 spx2931an-3.3 2% 3.3v 3 lead to-92 spx2931an-3.3/tr 2% 3.3v 3 lead to-92 spx2931an-3.5 2% 3.5v 3 lead to-92 spx2931an-3.5/tr 2% 3.5v 3 lead to-92 spx2931m1-3.3 3% 3.3v 3 lead sot-89 spx2931m1-3.3/tr 3% 3.3v 3 lead sot-89 spx2931m1-3.5 3% 3.5v 3 lead sot-89 spx2931m1-3.5/tr 3% 3.5v 3 lead sot-89 spx2931n-3.3 3% 3.3v 3 lead to-92 spx2931n-3.3/tr 3% 3.3v 3 lead to-92 spx2931n-3.5 3% 3.5v 3 lead to-92 spx2931n-3.5/tr 3% 3.5v 3 lead to-92 available in lead free packaging. to order add "-l" suffix to part number. example: spx2931an-3.3/tr = standard; spx2931an-l-3.3/tr = lead free /tr = tape and reel pack quantity is 2,000 for to-92 and 2,500 for sot-89. click here to order samples
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