rev. 10/24/00 spx2931 100ma low dropout voltage regulator features ? 3.5v, 3.3v, and 3.0v versions are available ? reverse battery protection ? output current in excess of 100 ma ? short circuit protection ? input-output differential is less than 0.6v ? 60v load dump protection ? mirror-image insertion protection ? -20v reverse transient protection ? internal thermal overload protection application ? available in to-220, to-92, sot-89, and so-8 package types ? portable instrumentation ? available as adjustable with ttl compatible switch ? radio control systems ? similar improved to industry standard lm2931 ? cordless telephones product description the spx2931 is a low power 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 (typ. 50 mv at light load and 300 mv at 100 ma). other features include the logic- compatible on/off input which enables the regulator to be switched on and off. the spx2931 is offered in a 3-pin to-92/to-220 package and sot-89/so-8 package. pin connections bottom view to-92 (n) spx2931 sot-89 (m1) top view 1 2 3 v in gnd v out 13 2 gnd v in v out top view 2 1 3 4 8 7 6 5 spx2931 8-pin surface mount (s) fixed output v out gnd gnd byp on/off gnd gnd v in front view to-220-3 (u) fixed spx2931 1 23 1. v in 2. gnd 3. v out
rev. 10/24/00 spx2931 absolute maximum ratings power dissipation........................................... internally limited lead temp. (soldering, 5 seconds)................................. 260c storage temperature range ........................... -65c to +150c operating junction temperature range ........... -40c to +85c input supply voltage............................................. -0.3 to +26v esd rating.........................................................................2kv electrical characteristics at v s = 14v, t a = 25c, i o = 10 ma, c2 = 100 f, unless otherwise specified. ( note 1) parameter conditions spx2931a spx2931 units min typ max min typ max 3.0 volt version spx2931a-3 spx2931-3 output voltage 6v -0.3v, r l = 500 ? -15 -30 -15 30 v reverse polarity input voltage, transient 1% duty cycle, < 100ms, r l = 500 ? -50 -80 -50 -80 v output noise voltage 10hz-100khz, c out =100 f 500 500 vrms ripple rejection f o = 120hz 80 80 db note 1: see typical applications notes to ensure constant junction temperature, low duty cycle pulse testing used. note 2: all limits are at 25 c or over the full operating temperature junction range of -40 c to +85 c. note 3: the maximum power dissipation is a function of maximum junction temperature, total thermal resistance, and ambient temperature . note 4: human body model, 100 f discharged through 1.5 k ? .
rev. 10/24/00 spx2931 application hints 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 only bench testing is the only means to determine the proper capacitor type and value. the high quality 100 f aluminum electrolytic covers all general application circuits, this stability can be obtained with a tantalum electrolytic value of 47 f. another critical point of electrolytic characteristics 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 temperature range. other points with linear regulators is that the twitch higher output current stability decreases. in most applications the spx2931 is operating at few milliamps. in these applications the output 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. with the spx2931 adjustable regulator, the minimum value of output capacitance is a function of the output voltage. 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 minimum of 0.6 volts required at the input of regulator above the output to keep the power dissipation and die heating to its minimum. after the value for the capacitor has been determined for actual use, the value should be doubled.
rev. 10/24/00 spx2931 typical characteristics input output differential (v) 0.6 0.5 0.2 0 junction temperature (oc) quiescent current (ma) 25 3 2 0 -40 0 80 120 junction temperature (oc) 0.4 0.3 0.1 0 40 80 120 dropout voltage quiescent current 6.0 3.0 2.0 1.0 2.0 3.0 4.0 5.0 6.0 input voltage (v) low voltage behavior output voltage (v) 1.0 0.8 0.6 0.5 0 5 10 15 20 25 30 ambient temperature (oc) maximum power dissipation (so- 8) power dissipation (w) 0.9 0.7 0.4 10 1 0.1 0 30 60 90 120 150 frequency (hz) maximum power dissipation output impedance ( ?) ?) ?) ?) 0.01 input output differential (v) 0.4 0.2 output current (ma) quiescent current (ma) 0 0 output current (ma) 0.3 0.1 0 dropout voltage quiescent current 22 20 6 0 010 20 40 70 80 100 ambient temperature (oc) maximum power dissipation (to-220) power dissipation (w) reference voltage (v) 1.10 18 21 output voltage (v) reference voltage output current (ma) 800 500 0 input voltage (v) 200 100 10 20 peak output current 1.0 020405060 ambient temperature (oc) maximum power dissipation (to-92) power dissipation (w) 30 60 90 5 10 15 20 25 30 0 50 100 1.12 1.18 1.22 1.26 1.30 912 300 400 0.9 0.8 0.7 0.6 0.5 0.4 operation during load dump time (ms) output voltage (v) 400 200 100 -100 30 10 0 6 4 -2 10 15 20 15 30 18 2 0 0 300 1 ~ ~ ~ ~ 40 i o = 0ma i o = 50ma v in = 14v 24 6 3 0 1.14 1.16 1.24 1.20 1.28 lm2931ct adjustable i o = 100ma i o = 50ma i o = 10ma 0.5 0.6 0 t j = 25oc t j = 85oc t j = -40oc 4.0 5.0 lm2931 5.0 i o = 100 ma infinite heat sink 10 oc/w heat sink no heat sink 14 16 12 10 8 4 2 30 50 60 90 0.1 0.3 0.2 0 10 30 70 80 90 0.125" lead length from pc board 0.4" length frompc board lm2931- 5.0 i o = 10ma 0.3 0.2 0.1 0 ~ ~ 20 40 50 60 70 500 output voltage (v) ~ ~ c o = 100f r l = 500w
rev. 10/24/00 spx2931 typical applications schematic diagram as2931 as2931 fixed output spx2931 spx2931 fixed out p ut
rev. 10/24/00 spx2931 ordering information ordering no. precision output voltage packages spx2931n 3% adj 3 lead to-92 spx2931n-3.0 3% 3.0v 3 lead to-92 spx2931n-3.3 3% 3.3v 3 lead to-92 spx2931n-3.5 3% 3.5v 3 lead to-92 spx2931an 2% adj 3 lead to-92 spx2931an-3.0 2% 3.0v 3 lead to-92 spx2931an-3.3 2% 3.3v 3 lead to-92 spx2931an-3.5 2% 3.5v 3 lead to-92 spx2931cn 5% adj 3 lead to-92 spx2931cn-3.0 5% 3.0v 3 lead to-92 spx2931cn-3.3 5% 3.3v 3 lead to-92 spx2931cn-3.5 5% 3.5v 3 lead to-92 spx2931s 3% adj 8 lead soic spx2931s-3.0 3% 3.0v 8 lead soic spx2931s-3.3 3% 3.3v 8 lead soic spx2931s-3.5 3% 3.5v 8 lead soic spx2391as 2% adj 8 lead soic spx2391as-3.0 2% 3.0v 8 lead soic spx2391as-3.3 2% 3.3v 8 lead soic spx2391as-3.5 2% 3.5v 8 lead soic spx2931cs 5% adj 8 lead soic spx2931cs-3.0 5% 3.0v 8 lead soic spx2931cs-3.3 5% 3.3v 8 lead soic spx2931cs-3.5 5% 3.5v 8 lead soic spx2931u 3% adj 3 lead to-220 spx2931u-3.0 3% 3.0v 3 lead to-220 spx2931u-3.3 3% 3.3v 3 lead to-220 spx2931u-3.5 3% 3.5v 3 lead to-220 spx2931au 2% adj 3 lead to-220 spx2931au-3.0 2% 3.0v 3 lead to-220 spx2931au-3.3 2% 3.3v 3 lead to-220 spx2931au-3.5 2% 3.5v 3 lead to-220 spx2931cu 5% adj 3 lead to-220 spx2931cu-3.0 5% 3.0v 3 lead to-220 spx2931cu-3.3 5% 3.3v 3 lead to-220 spx2931cu-3.5 5% 3.5v 3 lead to-220 spx2931m1 3% adj 3 lead sot-89 spx2931m1-3.0 3% 3.0v 3 lead sot-89 spx2931m1-3.3 3% 3.3v 3 lead sot-89 spx2931m1-3.5 3% 3.5v 3 lead sot-89 spx2931am1 2% adj 3 lead sot-89 spx2931am1-3.0 2% 3.0v 3 lead sot-89 spx2931am1-3.3 2% 3.3v 3 lead sot-89 spx2931am1-3.5 2% 3.5v 3 lead sot-89 spx2931cm1 5% adj 3 lead sot-89 spx2931cm1-3.0 5% 3.0v 3 lead sot-89 spx2931cm1-3.3 5% 3.3v 3 lead sot-89 spx2931cm1-3.5 5% 3.5v 3 lead sot-89
rev. 10/24/00 spx2931 signal processing excellence sipex corporation headquarters and main offices: 22 linnell circle billerica, ma 01821 tel: (978) 667-8700 fax: (978) 670-9001 e-mail: sales@sipex.com 233 south hillview drive milpitas, ca 95035 tel: (408) 935-7600 fax: (408) 934-7500 sipex corporation reserves the right to make changes to any products described herein. sipex does not assume any liab ility arising out of the application or use of any product or circuit described hereing; neither does it convey any license under its patent rights nor the rights of others. corporation
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