EC50117E 1 a positive volta ge regulator s 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 4 h14 n - rev. f00 1 ordering information part number package marking marking information EC50117E xxb7nr sot223 - 3l 117e - xx yw lllll 1. 117 e 4. lllll lot no general description features the EC50117E series of high performance low dropout voltage regulators are designed for applications that require efficient conversion and fast transient response. in addition, EC50117E is designed to be stable unde r 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. EC50117E is characterized u nder junction temperature from - 40c to +125c. low dropout performance. low quiescent current 2.7ma typ. guaranteed 1a output current. wide input supply voltage range. stable operation without cin and cout. over - temperature and over - current protection. fixed or adjustable output voltage. available in sot - 223 and to252 packages. rohs compliant applications active scsi terminators. high efficiency linear regulators. pin assignment p a c k age : s o t 22 3 - 3l 5v to 3.3v linear regulators motherboard clock supplies.
EC50117E 1 a positive volta ge regulator s 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 4 h14 n - rev. f00 1 absolute maximum rating caution: stresses above those listed in absolute maximum ratings may cause per manent damage to the device. this is a stre ss only rating and operation of the device at these or a ny other conditions above those indicated in the operational sections of this specification is not implied. electrical characteristics v in,max 9v, v in,min C v out = 2v, i out = 10ma, c in = 10f, c out = 22f, t a = 25c, unless otherwise specified. 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 temperatur e 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 symbol parameter test condition min typ max units v o output voltage EC50117E 15 EC50117E 18 EC50117E 25 EC50117E 33 EC50117E 50 1.470 1.764 2.450 3.234 4.9 00 1.5 1.8 2.5 3.3 5.0 1.530 1.836 2.550 3.366 5.100 v v ref reference voltage (adj. voltage version) (v in - v out ) = 1.5v i out = 10ma ( - 2%) 1.250 (+2%) v v sr line regulation v out + 1.5v < v in < 9v i out = 10ma -- 0.3 -- %/v v lr load regulation (1) (v in - v out ) = 2.0v 10ma i out 1a -- 0.0001 -- %/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 < 9v -- 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
EC50117E 1 a positive volta ge regulator s 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 4 h14 n - rev. f00 1 electrical characteristics notes: 1. low du ty cycle pulse testing with which tj remains unchanged. 2. the dropout voltage is the input/output differential at which the circuit ceases to regulate against further r eduction in input voltage. it is measured when the output voltage has dropped 98% from the nominal value obtained at v in = v out +2v. typical application symbol parameter test condition min typ max units t c temperature coefficient -- 30 -- ppm/ /v o tp thermal protection v in =9v, 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 ) = 3v, i out = 10ma -- 60 -- db
EC50117E 1 a positive volta ge regulator s 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 4 h14 n - rev. f00 1 a pplication hints the typical linear regulator would require external capacitors to ensure stability. however, EC50117E is designed in such a way that these externa l capacitor can be omitted if the pcb layout is tight and system noise is not very high. for better transien t and psrr performance, the input and output capacitors are still recommended. input capacitor an input capacitor of 10 f 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 better 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 t he thermal limit of the package is not exceeded. the EC50117E 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 applicati on can be calculated as following: the power di ssipation (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, ta is the ambient temperature, and ja is around 120c/w for EC50117E . EC50117E is designed to enter thermal protection at 125c. for example, if t a is 25c then the maximum p d is l imited to about 0.83w. in other words, if i out(max) = 500ma, then [v in C v out ] can not exceed 1.66v. (ref. sot223 without heat sink.)
EC50117E 1 a positive volta ge regulator s 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 4 h14 n - rev. f00 1 typical performance characteristics reference voltage vs junction temperature output voltage vs load current dropout voltage vs load current psrr vs frequency dropout volatge vs oueput current adjus pin current vs temperature
EC50117E 1 a positive volta ge regulator s 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 4 h14 n - rev. f00 1 typical performance characteristics line transient response load transient response short transient response short circuit start - up transient mechanical dimensions o utline drawing sot 223 - 3l
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