ec49124 500ma super ldo linear regulator c o n v e r t e r e - c m o s c o r p . ( ww w . e c m o s . c o m . t w ) p a g e 1 o f 6 4i05n - rev.f001 description s the e c49124 i s an ef f icient l inear v o ltage r e gulator . it has extra low dropout voltage. at light loads the typical dropout voltage is 15mv, at full load the typical dropout voltage is 800mv. the output voltage accuracy is better than 2%. th e ec49124 has low ground current at 65ua, so it can help prolong battery life. the ec49124 is specially designed for hand - held, battery - powered devices. feature typical 175mv dropout voltage at 150ma. low ground current at 65ua. (typ.) guaranteed 500ma output over the full operating temperature range. extremely tight load and line regulation. low temperature coefficient. current and thermal limiting. no - load stability. standard sot - 89 - 3l package. application active scsi terminators. post regulators for switching supplies. battery chargers. high - efficiency linear power supplies. computer motherboard, display, graphic card dc/dc conver ter, such as 5v to 3.3v, 3.3v to 2.8v or 3.3v to 2.5v. ordering information ec 49124 - xx - xx x x b6 sot 89 - 3l pin type pin (1=>3) g: out/gnd/in n: gnd/in/out 1 . g : o u t / g n output voltage 1.5v 15 1.8v 18 2.5v 25 2.8v 28 3.0v 30 3.3v 33 3 .4v 34 r tape & reel
ec49124 500ma super ldo linear regulator c o n v e r t e r e - c m o s c o r p . ( ww w . e c m o s . c o m . t w ) p a g e 2 o f 6 4i05n - rev.f001 pin configuration typical application absolute maximum ratings (1) operating ratings (2) supply input voltage (v in ) .....+6v supply input voltage (v in ) .. +2.8v to +5.5v power dissipation (pd) .. internally limited (3) junction temperature (t j ) ... 0c to +125c junction temperature (tj) ............... .. 150c package thermal lead temperature (soldering, 5 s ec.) ..... 260c resistance 180c/w storage temperature (t s ) .. - 40c to +150c part number package marking marking information ec49124 - xx - b6gr sot89 - 3l 49124 xx ywg xx output voltage(ex 15=1.5 v) yw date code ec49124 - xx - b6nr sot89 - 3l 49124 xxywn ec49124 - 33
ec49124 500ma super ldo linear regulator c o n v e r t e r e - c m o s c o r p . ( ww w . e c m o s . c o m . t w ) p a g e 3 o f 6 4i05n - rev.f001 symbol parameter conditions min typ max units v out output voltage accuracy ec49124 - 1.5v(v in =3.3v) ec49124 - 1.8v(v in =3.3v) ec49124 - 2.5v ec49124 - 2.8v ec49124 - 3.0v ec49124 - 3.3v 1.470 1.764 2.450 2.744 2.9 40 3.234 1.5 1.8 2.5 2.8 3.0 3.3 1.530 1.836 2.550 2.856 3.060 3.366 v v out /t output voltage temperature coefficient note 4 -- 50 -- ppm/ v out / v out line regulation v in = v out + 1v to 5.5v -- 1 -- % v out / v out load regulation (5) i out =10ma to 25 0ma (5) -- 1 -- % i out =10ma to 400ma (5) -- 1.5 -- v in - v out dropout voltage (6) i out =10ma -- 15 -- mv i out =150ma -- 175 -- i out =250ma -- 320 -- i out =500ma -- 800 -- t protection thermal protection thermal protection temperature -- 150 -- protection hysterisys -- 20 -- psrr ripple rejection f =120hz -- 51 -- db i ground ground current i out =10ma -- 65 -- ua i limit current limit v out =0v -- 700 -- ma electrical characteristics v in = 5v; c in = 2.2f; c out = 2.2f electrolytic capacitor ; i out = 10ma; t j = 25c; unless otherwise noted. note 1: exceeding the absolute maximum rating may damage the device. note 2: the device is not guaranteed to function outside its operating rating. note 3: the maximum allowable power dissipation at any t a (ambient temperature) is calculated using: p d(max) = (t j(max) - t a )/ ja . exceeding the maximum allowable power dissipation will result in excessive die temperature, and theregulator will go into thermal shutdown. see table 1 and the thermal considerations section for details. note 4: output voltage temperature coefficient is the worst - case voltage change divided by the total temperature range. note 5: re gulation is measured at constant junction temperature using low duty cycle pulse testing. parts are tested for load regulation in the load range from 100 a to 500ma. changes in output voltage due to heating effects are covered by the thermal regulation specification. note 6: dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal v alue measured at 1v differential. note 7: the cin or cout should be chosen carefully. please refer to the application hints
ec49124 500ma super ldo linear regulator c o n v e r t e r e - c m o s c o r p . ( ww w . e c m o s . c o m . t w ) p a g e 4 o f 6 4i05n - rev.f001 application hints like any low dropout regulator, ec49124 requires external capacitors to ensure stability. th e external capacitors must be carefully selected to ensure the performances. input capacitor: an input capacitor of at least 2.2uf is required. the inexpensive electrolytic capacitor is preferred. the value can be increased without upper limit. output capacitor: an output capacitor is required for look stability. it must be located no more than 1cm away from the v out pin, and connected directly between v out and gnd pins. the inexpensive electrolytic capacitor is recommended. the minimum value is 2.2uf but once again its value can be increased without limit. thermal consideration it is important that the thermal limit of the package should not be exceeded. the ec49124 has built - in thermal protection. when the thermal limit is exce eded, the ic will enter protection, and the v out will be reset to zero. the power dissipation for a given application can be calculated as follows: the power dissipation (p d ) is p d = i out * [v in C v out ] the thermal limit of the package is then limited to p d(max) = [t j C t a ]/ ja where t j is the junction temperature, t a is ambient temperature, and ja is around 180c/w for ec49124 . ec49124 is designed to enter thermal protection at 150c. for example, if t a is 25c then the max p d is limited to about 0.7w. in other words, if i o ut(max) = 500ma, then [v in C v out ] can not exceed 1.4v.
ec49124 500ma super ldo linear regulator c o n v e r t e r e - c m o s c o r p . ( ww w . e c m o s . c o m . t w ) p a g e 5 o f 6 4i05n - rev.f001 typical performance characteristics (v in = 5v, c in = 2.2f, c out = 2.2f, t a =25c, unless otherwise noted.)
ec49124 500ma super ldo linear regulator c o n v e r t e r e - c m o s c o r p . ( ww w . e c m o s . c o m . t w ) p a g e 6 o f 6 4i05n - rev.f001 outline drawing for sot - 89
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