ec49509 300ma low power low noise ldo cmos voltage regulator e-cmos corp. ( www.ecmos.com.tw ) page 1 of 8 2007/11/05 description the ec49509 series of fixed output low dropout linear regulators are designed for portable battery powered applications, which require low power consumption, low noise environment, and low dropout voltage. each device contains a bandgap voltage reference, an error amplifier, a pmos power transistor, and resistors for setting output voltage, and current limit and temperature limit protection circuits. the ec49509 has been designed to be used with low cost capacitors and requires a minimum output capacitor of 1.0 f. the output voltages range from 1.3v to 4.4v in 100mv increments. standard voltage versions are 1.5, 1.8, 2.5, 2.8, 3.0, and 3.3v. features z typical 200mv dropout voltage at 150ma z fast enable turn-on time of 20 s (typ.) z excellent line and load regulation z high accuracy output voltage of 2% z ultra-low ground current at 20 a (typ.) z disable current less than 0.1 a (typ.) z over current and thermal protection z no reverse current z standard sot-23-5l package applications z usb removable devices z mpeg4 devices z wireless lan?s z hand-held instrumentation z portable dvd players z digital camera block diagram
ec49509 300ma low power low noise ldo cmos voltage regulator e-cmos corp. ( www.ecmos.com.tw ) page 2 of 8 2007/11/05 package vout voltage part number marking marking information 3.3v ec49509alg-f 509 alz 2.8v ec49509blg-f 509 blz 2.5v ec49509clg-f 509 clz 1.8v ec49509dlg-f 509 dlz 1.5v ec49509elg-f 509 elz sot-23-5l 3.0v EC49509FLG-F 509 flz dfn2x2 3.3v ec49509af-f 509a starting with 9, a bar on top of 9 is for production year 2005, and underlined 9 is for year 2006. the naming pattern continues with consecutive characters for later years. the middle character (a-f) is the output voltage of production. l means the package is sot-23-5l. the last character is the week code. (a-z: 1-26, a-z: 27-52). a dot on top right corner is for lead-free process. pin configuration ordering/marking information 509 alz ec49509 x x x - f output voltage: a = v out = 3.3v b = v out = 2.8v c = v out = 2.5v d = v out = 1.8v e = v out = 1.5v f = v out = 3.0v package: l = sot-23-5l pin (1-5) : g = v in /gnd/en/bypass/v out f: lead-free f = dfn 2x2 6 5 4 1 2 3 vin nc vout enable gnd bypass 509a dfn2x2 (top view)
ec49509 300ma low power low noise ldo cmos voltage regulator e-cmos corp. ( www.ecmos.com.tw ) page 3 of 8 2007/11/05 absolute maximum rating (note1) parameter symbol value units input voltage v in 6 v enable voltage v en -0.3 to v in v output voltage v out -0.3 to 4.6 v power dissipation p d internally limited ( note 3) w output short circuit duration ? infinite ? thermal resistance, junction-to-ambient ja 230 c/w lead temperature (soldering, 5 sec.) ? 260 c junction temperature t j 0 to +150 c storage temperature t s -40 to +150 c recommended operating conditions (note 2) parameter symbol value units supply input voltage range v in 5.5 v junction temperature range t j 0 to +125 c
ec49509 300ma low power low noise ldo cmos voltage regulator e-cmos corp. ( www.ecmos.com.tw ) page 4 of 8 2007/11/05 electrical characteristics v in = 5v; v en =v in ; c in = 2.2 f; c out = 2.2 f; i out = 10ma; t j = 25c; unless otherwise noted symbol parameter conditions min typ max unit v out output voltage accuracy ec49509 ? 1.5 (v in =1.8v) ec49509 ? 1.8 (v in =3.3v) ec49509 ? 2.5 ec49509 ? 2.8 ec49509 ? 3.0 ec49509 ? 3.3 1.470 1.764 2.450 2.744 2.940 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 line regulation v in = (v out + 0.8) v to 5.5v ? 0.2 ? %/v v out load regulation (note 5) v in = (v out + 0.8) v or 2.5v i out = 10ma to 300ma ? 2.0 ? % v out / t output voltage temperature coefficient note 4 ? 0.1 ? mv/ c i out = 10ma ? 8 ? i out = 150ma ? 200 ? v in ? v out dropout voltage ( note 6) (v out >3.0v) i out = 300ma ? 350 ? mv thermal protection temperature ? 150 ? t protection thermal protection protection hysterisys ? 20 ? c psrr ripple rejection f =10khz,i out =50ma,c bypass =0.1uf ? 70 ? db v en = 0.4v ? 0.1 ? i q quiescent current v en = v in ? 20 ? a voltage raising, output turns on, logic high 1.6 ? ? v th (en) enable input threshold voltage voltage falling, output turns off, logic low ? ? 0.4 v i limit current limit ? 600 ? ma note 1: exceeding the absolute maximum rating may damage the device. note 2: the device is not guaranteed to f unction 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 the regulator will go into thermal shutdown. see ?thermal consideration? section for details note 4: output voltage temperature coefficient is the worst case voltage change divided by the total temperature range. note 5: regulation is measured at constant junction temperatur e using low duty cycle pulse testing. parts are tested for load regulation in the load range from 0.1ma to 300ma. 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 differ ential at which the output voltage drops 100mv below its nominal value measured at 0.8v differential.
ec49509 300ma low power low noise ldo cmos voltage regulator e-cmos corp. ( www.ecmos.com.tw ) page 5 of 8 2007/11/05 line regulation (iout=10ma) 3.15 3.20 3.25 3.30 3.35 3.40 3.60 4.10 4.60 5.10 vin (v) vout (v) load regulation (vin=4.3v) 3.15 3.20 3.25 3.30 3.35 3.40 0 100 200 300 400 iout (ma) vout (v) iq vs. iout(vout=3.3v) 20 22 24 26 28 30 32 0 50 100 150 200 250 300 350 iout (ma) iq ( a) iq vs. vin(vout=3.3v) 25.0 25.5 26.0 26.5 27.0 27.5 3.6 4.0 4.4 4.8 5.2 5.6 vin (v) iq ( a) typical performance characteristics figure 1. figure 2. figure 3. figure 4.
ec49509 300ma low power low noise ldo cmos voltage regulator e-cmos corp. ( www.ecmos.com.tw ) page 6 of 8 2007/11/05 psrr (vin=vout+1v+0.5vp-pac iout=50ma cbypass=0.1 f) 0 10 20 30 40 50 60 70 80 0.1 1 10 100 frequency (khz) psrr (db) load transient response (vout = 3.3v) (iout=10ma to 300ma) figure 5. figure 6. input transient response (vout = 3.3v) (vin=3.6v to 5.0v) typical performance characteristics (continued) figure 7.
ec49509 300ma low power low noise ldo cmos voltage regulator e-cmos corp. ( www.ecmos.com.tw ) page 7 of 8 2007/11/05 application hints like any low dropout regulator, ec49509 requires external capa citors to ensure stability. the external capacitors must be carefully selected to ensure performance. input capacitor an input capacitor of at least 1 f is required. ceramic or tantalum can be used. the value can be increase without upper limit. output capacitor an output capacitor is required for stability. it must be placed no more than 1 cm away from the v out pin, and connected directly between v out and gnd pins. the minimum value is 1 f but may be increase without limit. thermal considerations it is important that the thermal limit of the package is not exceeded. the ec49509 has built-in thermal protection. when the thermal limit is exceeded, the ic will enter protection, and v out will be pulled to ground. the power dissipation for a given application can be calculated as following: the power dissipation (p d ) is p d = i out * [v in ? v out ] the thermal limit of the package is then limited to p d (max) = [t j ? t a ]/ ja where t j is the junction temperature, ta is the ambient temperature, and ja is around 230c/w for ec49509. ec49509 is designed to enter thermal protection at 150c. for example, if t a is 25c then the maximum p d is limited to about 0.6w. in other words, if i out (max) = 300ma, then [v in ? v out ] cannot exceed 2v. application diagram
ec49509 300ma low power low noise ldo cmos voltage regulator e-cmos corp. ( www.ecmos.com.tw ) page 8 of 8 2007/11/05 outline drawing sot-23-5l dimensions dimn inches mm min max min max a 0.106 0.122 2.70 3.10 b 0.055 0.071 1.40 1.80 c 0.030 0.045 0.75 1.15 d 0.011 0.022 0.30 0.55 e ? 0.037 ? 0.95 f ? 0.075 ? 1.90 h ? 0.006 ? 0.15 j 0.0035 0.008 0.090 0.20 k 0.102 0.118 2.60 3.00 outline drawing dfn2x2 b k a f d e c h j
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