revision 12/4/2008 preliminary and all contents are subject to change without prior notice ? seaward electronics inc., 2005. ? www.seawardinc.com.cn ? page 1 600ma cmos low power low noise ldo voltage regulator SE5121 description the SE5121 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 SE5121 has been designed to be used with low cost capacitors and requires a minimum output capacitor of 1.0 f. standard voltage versions are 1.5, 1.8, 2.5, 2.8, 3.0, 3.3, 3.5and 3.6v. features ? typical 175mv dropout voltage at 150ma. ? excellent line and load regulation. ? high accuracy output voltage of 2%. ? ultra-low ground current at 35 a (typ.) ? over current and thermal protection. ? standard sot-89-3l package. ? 100% lead (pb)-free pin configuration application ? usb removable devices ? mpeg4 devices ? wireless lan?s ? hand-held instrumentation. ? portable dvd players ? digital camera block diagram ordering information SE5121 _ _ _ pin (1=>3): 1. g: out/gnd/in 2. n: gnd/in/out package type: 1. k: sot-89-3l output voltage: 1. a: v out = 3.3v 2. b: v out = 2.8v 3. c: v out = 2.5v 4. d: v out = 1.8v 5. e: v out = 1.5v 6. f: v out = 3.0v 7. y: v out = 3.5v 8. q: v out = 3.6v
revision 12/4/2008 preliminary and all contents are subject to change without prior notice ? seaward electronics inc., 2005. ? www.seawardinc.com.cn ? page 2 600ma cmos low power low noise ldo voltage regulator SE5121 absolute maximum rating (1) parameter symbol value units input voltage v in 6 v output voltage v out -0.3 to v in v power dissipation p d internally limited (3) output short circuit duration infinite thermal resistance, junction-to-ambient ja 180 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 operating rating (2) parameter symbol value units supply input voltage v in 5.5 v junction temperature t j 0 to +125 c electrical characteristics v in = 5v; c in = 2.2 f; c out = 2.2 f electrolytic capacitor ; i out = 10ma; t j = 25c; unless otherwise noted symbol parameter conditions min typ max unit v out output voltage accuracy SE5121 ? 1.5(v in =3.3v) SE5121 ? 1.8(v in =3.3v) SE5121 ? 2.5 SE5121 ? 2.8 SE5121 ? 3.0 SE5121 ? 3.3 SE5121 ? 3.5 SE5121 ? 3.6 1.470 1.764 2.450 2.744 2.940 3.234 3.430 3.528 1.5 1.8 2.5 2.8 3.0 3.3 3.5 3.6 1.530 1.836 2.550 2.856 3.060 3.366 3.570 3.672 v v out line regulation v in = (v out + 0.8)v to 5.5v -- 0.2 -- %/v v out load regulation (5) v in = (v out + 0.8)v to 2.5v i out = 10ma to 600ma -- 2.0 -- % v out / t output voltage temperature coefficient note 4 -- 0.1 -- mv/c
revision 12/4/2008 preliminary and all contents are subject to change without prior notice ? seaward electronics inc., 2005. ? www.seawardinc.com.cn ? page 3 600ma cmos low power low noise ldo voltage regulator SE5121 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 600ma. 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 2% below its nominal value measured at 1v differential. note 7: the cin or cout should be chosen carefully. please refer to the application hints electrical character istics (continued) v in = 5v; c in = 2.2 f; c out = 2.2 f electrolytic capacitor ; i out = 10ma; t j = 25c; unless otherwise noted symbol parameter conditions min typ max unit i out = 10ma -- 5 -- i out = 150ma -- 175 -- i out = 250ma -- 300 -- v in ? v out dropout voltage (6) i out = 600ma -- 800 -- mv thermal protection temperature -- 150 -- t protection thermal protection protection hysterisys -- 20 -- c psrr ripple rejection f = 120 hz -- 60 -- db i q quiescent current i out = 10ma -- 35 -- a i limit current limit 600 -- -- ma application diagram
revision 12/4/2008 preliminary and all contents are subject to change without prior notice ? seaward electronics inc., 2005. ? www.seawardinc.com.cn ? page 4 600ma cmos low power low noise ldo voltage regulator SE5121 application hints like any low dropout regulator, SE5121 requires external capacitors to ensure stability. the external capacitors must be carefully selected to ensure performance. thermal considerations it is important that the thermal limit of the package is not exceeded. the SE5121 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 180c/w for SE5121. SE5121 is designed to enter thermal protection at 150c. for example, if t a is 25c then the maximum p d is limited to about 0.7w. in other words, if i out(max) = 600ma, then [v in ? v out ] cannot exceed 1.7v. input capacitor an input capacitor of at least 1 f is required. the inexpensive electrolytic capacitor is preferred. the value can be increased 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 inexpensive electrolytic capacitor is recommended. the minimum value is 1 f but may be increased without limit.
revision 12/4/2008 preliminary and all contents are subject to change without prior notice ? seaward electronics inc., 2005. ? www.seawardinc.com.cn ? page 5 600ma cmos low power low noise ldo voltage regulator SE5121 outline drawing sot-89-3l customer support seaward electronics incorporated ? china section b, 2nd floor, shangdi scientific office complex, #22 xinxi road haidian district, beijing 100085, china tel: 86-10-8289-5700/01/05 fax: 86-10-8289-5706 seaward electronics corporation ? taiwan 2f, #181, sec. 3, minquan east rd, ta i p e i , ta i w a n r . o . c tel: 886-2-2712-0307 fax: 886-2-2712-0191 seaward electronics incorporated ? north america 1512 centre pointe dr. milpitas, ca95035, usa tel: 1-408-821-6600 last updated - 12/4/2008 a b c d e f g h i j k l m sot-89 min max min max a 0.173 0.181 4.400 4.600 b 0.159 0.167 4.050 4.250 c 0.067 0.075 1.700 1.900 d 0.051 0.059 1.300 1.500 e 0.094 0.102 2.400 2.600 f 0.035 0.047 0.890 1.200 g h i 0.016 0.020 0.400 0.520 j 0.055 0.063 1.400 1.600 k 0.014 0.016 0.350 0.410 l m 3.00ref 1.50ref 0.118ref 0.059ref 0.70ref 10typ 0.028ref 10typ dim n inches mm dimensions
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