2002 shor t for m catalog p-11 ?copyright 2001 sipex corporation p description the lp2950 and lp2951 ar e low power voltage r egulators. these devices ar e an excellent choice for use in batter y-power ed applications such as cor dless telephones, radio contr ol systems, and por table com - puters. the lp2950 and lp2951 featur e low quiescent cur r ent and low dr opout voltage (typ. 50mv at light load and 380 mv at 100ma). this includes a tight initial tolerance of 0.5% (typ.), extr emely good load and line r egulation (0.05% typ.), and ver y low output temperatur e coef ficient, making the lp2950/lp2951 useful as a low-power voltage r efer ence. the er r or flag output featur e is used as a power -on r eset for war ning of a low output voltage, due to a falling input voltage. the logic-com - patible shutdown featur e enables the r egulator to be switched on and off . the lp2950 is of fer ed in a 3-pin to-92 package compatible with other 5v , 3.0v & 3.3v r egulators. the lp2951 is available in an 8-lead soic package. lp2950/lp2951 100 ma lo w dr opout v olta g e regulator s featur es n guaranteed 100ma output cur r ent n 5.0v and 3.3v v ersions @ 100ma output n v er y low quiescent cur r ent n low dr opout v oltage: 380mv at 100ma n extr emely t ight load and line regulation n v er y low t emperatur e coef ficient n cur r ent & ther mal limiting n need only 1 f for stability n lp2951 versions only er r or flag w ar ns of output dr opout logic-contr olled electr onic shutdown output pr ogrammable fr om 1.24 to 29v n of fer ed in to-92 (lp2950) & soic (lp2951) applications n batter y power ed systems n cor dless t elephones n radio contr ol systems n por table/palm t op/notebook computers n por table consumer equipment n por table instr umentation n smps post-regulator n v oltage refer ence n automotive electr onics typical application cir cuits 100k output error error ______ sd v out gnd fb +v in +v in 1.23v 1.2 to 30v r 1 .01uf 3.3uf r 2 v ref 3 8 5 1 4 7 shutdown input + lp2951 adjustable regulator 470k w error ______ sd v out gnd +v in +v in r 1 1uf r 2 3 8 5 1 4 + fb 7 v out .. .. lp2951 reset latch off when error flag occurs 470k w
2002 shor t for m catalog p-12 ?copyright 2001 sipex corporation p block diagram input output unregula ted dc shutdown ground error ______ sense 5v @ 100ma max to cmos or ttl reference error detection comp ara tor error amplifier 1.23v from cmos or ttl + + + + + + 60 mv 3 7 8 1 2 6 5 4 60k w 330k w 180k w .. 1 m f _ _ feedback 5v t ap or dering infor mation - please consult the factor y for pricing and availability on a t ape-on-reel option. par t number . pr ecision output v oltage packages lp2950acn-3.3 0.5% 3.3v 3 lead to-92 lp2950acn-5.0 0.5% 5.0v 3 lead to-92 lp2950cn-3.3 1% 3.3v 3 lead to-92 lp2950cn-5.0 1% 5.0v 3 lead to-92 lp2951acs-3.3 0.5% 3.3v 8 lead soic lp2951acs-5.0 0.5% 5.0v 8 lead soic lp2951cs-3.3 1% 3.3v 8 lead soic lp2951cs-5.0 1% 5.0v 8 lead soic lp2950/lp2951 t o-92 (n) 8-pin surface mount (s) alpha as2930 1 t op v iew 2 3 4 5 6 7 8 lp2951 output sense shutdown ground input feedback 5v or 3.3v output error bottom v iew 1 3 2 vin ground vout packages
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