revision 11/11/2013 preliminary and all contents are subject to change without prior notice. ? seaward electronics, inc., 200 6 . ? www.sea wardi nc.com .cn ? page 1 features ? low d ropout p erformance. ? low quiescent current 2.7ma typ . ? guaranteed 1a output current . ? wide i nput s upply v oltage range . ? s tab le operation without cin and cout. ? over - temperature and over - current protection . ? fixed or a djustable o utput v oltage. ? available in sot - 223 and to252 p ackages. ? rohs compliant description the SE8117 series of high performance low dropout voltage regulators are designed for applications that require efficient conversion and fast transient r esponse. in addition, SE8117 is designed to be stable under conditions where cin and cout are not present. however, it is recommended to include cin and cout in the system design as this will speed up the transient response and increase the psrr rating. se 8117 is characterized unde r junction temperature from - 40c t o + 125 c . pin configuration ordering information device marking information package v out SE8117 txx hf SE8117txx hf sot - 223( halogen free ) xx denotes voltage options ( adj, 1. 5 v, 1. 8 v, 2.5v , 3.3v and 5.0v ) SE8117t xxl f SE8117t xxl f to - 252( lead free ) absolute maximum rating symbol parameter maximum units v in input supply voltage 18 v ja thermal resistance junction to ambient ( sot - 223 ) 120 c /w t j operating junction temperature range - 40 to 125 c t stg storage temperature range - 40 to 150 c t lead lead temperature (soldering 10 sec ) 260 c t mj maximum junction temperature 150 c application ? active scsi terminators. ? high efficiency linear regulators. ? 5v to 3.3v linear regulators ? motherboard clock supplies.
revision 11/11/2013 preliminary and all contents are subject to change without prior notice. ? seaward electronics, inc., 200 6 . ? www.sea wardi nc.com .cn ? page 2 electrical characteristic v in ,max 9 v , v in ,min ? v out = 2 v , i out = 10ma, c in = 1 0 f, c out = 22f, t a = 25c , unless otherwise specified. symbol parameter test condition min typ max units v o output voltage SE8117 t - 1 5 SE8117 t - 18 SE8117 t - 25 SE8117 t - 33 se 8117 t - 50 1.470 1.7 64 2.450 3 .234 4.900 1.5 1.8 2.5 3.3 5.0 1.530 1.8 36 2.550 3.366 5.100 v v ref reference voltage (adj. voltage version) (v in - v out ) = 1.5 v i out = 10ma ( - 2%) 1.250 (+2%) v v sr line regulation v out + 1.5v < v in < 9 v i out = 10ma -- 0. 3 - - % /v v lr load regulation (1) (v in - v out ) = 2.0 v 10ma i out 1a -- 0. 000 1 -- % /ma i q quiescent current fixed output version -- 2.7 5 ma i adj (i gnd ) adjust pin current gnd current -- 50 120 a ? i adj adjust pin current change v out + 1.5v < v in < 9 v -- 0.2 5 a v d dropout voltage (1) (2) i out = 1a -- 1.38 1. 49 v i o minimum load current -- 0. 4 5 ma i cl current limit (1) 1 1. 35 -- a t c temperature coefficient -- 30 -- ppm/ /v otp thermal protection v in = 9 v, i out =10ma -- 175 -- c v n rms output noise t a = 25c , 10hz f 10khz -- 0.003 -- %v o r a ripple rejection ratio f = 120hz, c out = 22f ( tantalum ), (v in - v out ) = 3 v, i out = 1 0 m a -- 60 -- db notes: 1. low duty cycle pulse testing with which t j remains unchanged. 2. the dropout voltage is the input/output differential at which the circuit ceases to regulate against further reduction in input voltage. it is measured when the output voltage has dropped 98% from the nominal value obtained at v in = v out + 2 v.
revision 11/11/2013 preliminary and all contents are subject to change without prior notice. ? seaward electronics, inc., 200 6 . ? www.sea wardi nc.com .cn ? page 3 typical application
revision 11/11/2013 preliminary and all contents are subject to change without prior notice. ? seaward electronics, inc., 200 6 . ? www.sea wardi nc.com .cn ? page 4 application hints the typical linear regulator would require external capacitors to ensure stability. however, SE8117 is designed i n such a way that these external capacitor can be omitted if the pcb layout is tight and system noise is not very high. for better transient and psrr performance, the input and output capacitors are still recommended. input capacitor an input capacitor of 10f is recommended. ceramic or tantalum can be used. the value can be increased without upper limit. output capacitor an output capacitor of 22uf is recommended for bet ter transient and psrr performance. it should be placed no more than 1 cm away from the v out pin, and connected directly between v out and gnd pins. the value may be increased without upper limit. thermal considerations it is important that the thermal limit of the package is not exceeded. the SE8117 has bui lt - 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 120 c/w for SE8117 . SE8117 is designed to enter thermal protection at 1 25 c. for example, if t a is 25c then the maximum p d is limited to about 0.83w. in other words, if i out(max) = 500ma, then [v in ? v out ] can not exceed 1.66v. (ref. so t 223 withou t heat sink.)
revision 11/11/2013 preliminary and all contents are subject to change without prior notice. ? seaward electronics, inc., 200 6 . ? www.sea wardi nc.com .cn ? page 5 typical performance characteristics reference voltage vs junction temperature 1.244 1.245 1.246 1.247 1.248 1.249 1.250 1.251 25 40 55 70 85 100 115 130 145 junction temperature (c) reference voltage (v) output voltage vs load current 1.786 1.7862 1.7864 1.7866 1.7868 1.787 1.7872 1 10 100 1000 load current (ma) output voltage (v) dropout voltage vs load current 0.9 1 1.1 1.2 1.3 1.4 1.5 1 10 100 1000 load current (ma) dropout voltage (v) psrr vs frequency 0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 100 1000 10000 100000 frequency(hz) psrr(db) dropout volatge vs oueput current adjus pin current vs temperature
revision 11/11/2013 preliminary and all contents are subject to change without prior notice. ? seaward electronics, inc., 200 6 . ? www.sea wardi nc.com .cn ? page 6 typical performance characteristics short transient response short circuit start - up transient line transient response load transient response
revision 11/11/2013 preliminary and all contents are subject to change without prior notice. ? seaward electronics, inc., 200 6 . ? www.sea wardi nc.com .cn ? page 7 outline drawing for sot - 223 outline drawing for to252
revision 11/11/2013 preliminary and all contents are subject to change without prior notice. ? seaward electronics, inc., 200 6 . ? www.sea wardi nc.com .cn ? page 8 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 fa x: 86 - 10- 8289 - 5706 seaward electronics corporation ? taiwan 2f, #181, sec. 3, min q uan east rd, taipei, taiwan 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 te l: 1 - 408- 821 - 6600 last updated - 11/11/2013
|
