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no. ea-043-0006 /2: # 5,33/( # 92/7$*( 5(*8/$725 # :,7+ # (;7(51$/ 75$16,6725 51 8 5) # 6(5,(6 $33/,&$7,21 # 0$18$/
low ripple voltage regulator with external transistor 51 8 5) # 6(5,(6 1 outline 7kh # 51 8 5) # 6hulhv # duh # yrowdjh # uhjxodwru # ,&v # zklfk # frqwuro # h[whuqdo # gulyhu # wudqvlvwruv # zlwk # kljk # ulssoh # uhmhfwlrq / kljk # dffx 0 udf\ # rxwsxw # yrowdjh /# orz # vxsso\ # fxuuhqw # e\ # &026 # surfhvv 1## (dfk # ri # wkhvh # yrowdjh # uhjxodwru # ,&v # frqvlvwv # ri # d yrowdjh # uhihu 0 hqfh # xqlw /# dq # huuru # dpsolilhu /# rxwsxw # yrowdjh # vhwwlqj # uhvlvwru /# vkruw # flufxlw # fxuuhqw # olplwlqj # flufxlw # dqg # fkls hqdeoh # flufxlw 1# 7khvh # ,&v # duh # vxlwdeoh # iru # frqvwuxfwlqj # uhjxodwruv # zlwk # xowud # orz # gursrxw # yrowdjh # dqg # dq # rxwsxw # fxuuhqw lq # wkh # udqjh # ri # vhyhudo # whqv # ri # p$ # dqg # vhyhudo # kxqguhgv # p$ 1## ,q # dgglwlrq # wr # orz # vxsso\ # fxuuhqw # e\ # &026 # surfhvv /# fkls hqdeoh # ixqfwlrq # fdq # eh # xvhg # wr # frqvhuyh # edwwhu\ # olih # gxulqj # vwdqge\ 1 )xuwkhupruh /# d # vxsuhph # ulssoh # uhmhfwlrq # dqg # d # wudqvlhqw # uhvsrqvh # duh # vxlwhg # iru # sruwdeoh # frppxqlfdwlru # vxfk # dv fhoo # skrqhv /# 3'$v /# zdon\ # wdonlhv 1## 627 5608#+ 0lql # 0rog ,# sdfndjh # lv # dydlodeoh 1 features 8owud # /rz # 6xsso\ # &xuuhqw 1111111111111111111111111111111111111111111 7<3 1#63 ?$ 6wdqge\ # 0rgh 111111111111111111111111111111111111111111111111111111111111111 7<3 1#314 ?$ +ljk # $ffxudf\ # 2xwsxw # 9r o w d j h 111111111111111111111111111111111111 ? 513( +ljk # 5lssoh # 5hmhfwlrq 11111111111111111111111111111111111111111111111111 7<3 1#93 g% 2 i 4 n+] /rz # 'ursrxw # 9r o w d j h 111111111111111111111111111111111111111111111111111 7<3 1#314 9 2 , 287 433 p$ /# ghshqghqw # rq # ([whuqdo # 7u 1 /rz # 7hpshudwxuh # 'uliw 111111111111111111111111111111111111111111111111 7<3 1# ? 433 ssp 2 ?& +ljk # /lqh # 5hjxodwlrq 111111111111111111111111111111111111111111111111111 7<3 1#3138(2 9 2xwsxw # 9r o w d j h 11111111111111111111111111111111111111111111111111111111111111 6whszlvh # vhwwlqj # zlwk # d # vwhs # ri # 314 9 # lq # wkh # udqjh # ri # 41; 9 # wr 913 9 &xuuhqw # /lplw # iru # h[whuqdo # 7u 11111111111111111111111111111111111111 7<3 1#; p$ /# /lplw # d # edvh # fxuuhqw applications 3rzhu # vrxufh # iru # edwwhu\ 0 srzhuhg # htxlsphqw 7hohfrppxqlfdwlrqv /# &dphudv /# 9&5v 3rzhu # vrxufh # iru # grphvwlf # dssoldqfhv
rn5rf 2 block diagram rn5rf a rn5rf b 2 5 1 v out gnd v dd ce vref 3 current limit + - 4 ext 2 5 1 v out gnd v dd ce vref 3 current limit + - 4 ext selection guide 7kh # rxwsxw # yrowdjh /# wkh # fkls # hqdeoh # dfwlyh # w\sh /# wkh # sdfnlqj # w\sh # dqg # wkh # wdslqj # w\sh # iru # wkh # ,&v # fdq # eh # vhohfwhg # dw wkh # xvhu * v # uhtxhvw 1 7kh # vhohfwlrq # fdq # eh # pdgh # e\ # ghvljqdwlqj # wkh # sduw # qxpehu # dv # vkrzq # ehorz = 51 8 5) # 2 ? 3duw # 1xpehu - -- - def g code contents d 6hwwlqj # 2xwsxw # 9r o w d j h #+ 9 287 ,#= 6whszlvh # vhwwlqj # zlwk # d # vwhs # ri #314 9 # lq # wkh # udqjh # ri #41; 9 # wr #913 9 # lv # srvvleoh 1 e 'hvljqdwlrq # ri # &kls # hqdeoh # $fwlyh # 7\ s h $ =# / # dfwlyh # w\sh % =# + # dfwlyh # w\sh f 'hvljqdwlrq # ri # 3dfnlqj # w\sh $ =# 7dslqj & =# $qwlvwdwlf # edj # rqo\ # iru # vdpsohv g 'hvljqdwlrq # ri # 7dslqj # w\sh ([ 1# 75 /# 7/ #+ uhihu # wr # 7dslqj # 6shflilfdwlrqv /# 75 # w\sh # lv # suhvfulehg # dv # d # vwdqgdug 1,
rn5rf 3 pin configuration sot-23-5 12 3 54 (mark side) ce/ce ext gnd v dd v out pin description pin no. symbol pin description 4 *1' *urxqg # 3lq 5 9 '' ,qsxw # 3lq 6 9 287 2xwsxw # 3lq 7 (;7 ([whuqdo # 7udqvlvwru # 'ulyh # 3lq #+ &026 # 2xwsxw , 8 &( # ru # &( &kls # (qdeoh # 3lq absolute maximum ratings symbol item rating unit 9 ,1 ,qsxw # 9r o w d j h 45 9 9 &( ,qsxw # 9r o w d j h # iru # &( 2 &( # 3lq 0316# wr # 9 ,1 # .316 9 9 (;7 (;7 # 2xwsxw # 9r o w d j h 45 9 , (;7 (;7 # 2xwsxw # &xuuhqw 83 p$ 3 ' 3rzhu # 'lvvlsdwlrq 483 p: 7rsw 2shudwlqj # 7hpshudwxuh # 5dqjh 073# wr #.;8 ?& 7v w j 6 w r u d j h # 7hpshudwxuh # 5dqjh 088# wr #.458 ?& absolute maximum ratings $evroxwh # 0d[lpxp # udwlqjv # duh # wkuhvkrog # olplw # ydoxhv # wkdw # pxvw # qrw # eh # h[fhhghg # hyhq # iru # dq # lqvwdqw # xqghu # dq\ # frq 0 glwlrqv 1# 0ruhryhu /# vxfk # ydoxhv # iru # dq\ # wzr # lwhpv # pxvw # qrw # eh # uhdfkhg # vlpxowdqhrxvo\ 1# 2shudwlrq # deryh # wkhvh # devr 0 oxwh # pd[lpxp # udwlqjv # pd\ # fdxvh # ghjudgdwlrq # ru # shupdqhqw # gdpdjh # wr # wkh # ghylfh 1# 7khvh # duh # vwuhvv # udwlqjv # rqo\ # dqg gr # qrw # qhfhvvdulo\ # lpso\ # ixqfwlrqdo # rshudwlrq # ehorz # wkhvh # olplwv 1
rn5rf 4 electrical characteristics 7r s w 58 ?& symbol item conditions min. typ. max. unit 9 287 2xwsxw # 9r o w d j h 9 ,1 0 9 287 413 9 , 287 83 p$ 9 287 31<; 9 287 4135 9 , 287 2xwsxw # &xuuhqw 9 ,1 0 9 287 413 9 413 -4 $ , (;7 (;7 # &xuuhqw 9 ,1 713 9 /# 9 (;7 513 9 8;48 p$ d 9 287 2 d , 287 /rdg # 5hjxodwlrq 9 ,1 0 9 287 413 9 4 p$ , 287 433 p$ 093 93 p9 9 ',) 'ursrxw # 9r o w d j h , 287 433 p$ /# , 287 3 p$ 314 315 9 , 66 6xsso\ # &xuuhqw 9 ,1 0 9 287 413 9 63 83 ?$ ,vwdqge\ 6wdqge\ # &xuuhqw 9 ,1 4313 9 3134 314 413 ?$ , (;7ohdn (;7 # /hdndjh # &xuuhqw 318 ?$ d 9 287 2 d 9 ,1 /lqh # 5hjxodwlrq , 287 83 p$ 9 287 .318 9 9 ,1 43 9 3 3138 3163 (2 9 5 5 5lssoh # 5hmhfwlrq i 4 n+] /# vlqxvrlgdo #318 9s 0 s 9 ,1 0 9 287 413 9 93 g% 9 ,1 ,qsxw # 9r o w d j h 43 9 9 (;7 (;7 # 2xwsxw # 9r o w d j h 43 9 d 9 287 2 d 7r s w 2xwsxw # 9r o w d j h # 7hpshudwxuh &rhiilflhqw , 287 43 p$ 073 ?& 7r s w ;8 ?& ? 433 ssp 2 ?& 5 38 3xoo # xs # uhvlvwdqfh # iru # &( # slq 7 0 w 9 &(+ &( # ,qsxw # 9r o w d j h # + 418 9 ,1 9 9 &(/ &( # ,qsxw # 9r o w d j h # / 3 3158 9 *1) the output current depends on the performance of external pnp transistor. use external pnp transis- tor of a low saturation type, with an h fe between 100 and 300. *) with respect to test circuit, refer to typical application.
rn5rf 5 7r s w 58 ?& symbol item conditions min. typ. max. unit 9 287 2xwsxw # 9r o w d j h 9 ,1 0 9 287 413 9 , 287 83 p$ 9 287 31<; 9 287 4135 9 , 287 2xwsxw # &xuuhqw 9 ,1 0 9 287 413 9 413 -4 $ , (;7 (;7 # &xuuhqw 9 ,1 713 9 /# 9 (;7 513 9 8;48 p$ d 9 287 2 d , 287 /rdg # 5hjxodwlrq 9 ,1 0 9 287 413 9 4 p$ , 287 433 p$ 093 93 p9 9 ',) 'ursrxw # 9r o w d j h , 287 433 p$ 314 315 9 , 66 6xsso\ # &xuuhqw 9 ,1 29 287 413 9 , 287 3 p$ 63 83 ?$ ,vwdqge\ 6wdqge\ # &xuuhqw 9 ,1 4313 9 3134 314 413 ?$ , (;7ohdn (;7 # /hdndjh # &xuuhqw 318 ?$ d 9 287 2 d v ,1 /lqh # 5hjxodwlrq , 287 83 p$ 9 287 .318 9 9 ,1 43 9 3 3138 3163 (2 9 5 5 5lssoh # 5hmhfwlrq i 4 n+] /# vlqxvrlgdo #318 9s 0 s 9 ,1 29 287 413 9 93 g% 9 ,1 ,qsxw # 9r o w d j h 43 9 9 (;7 (;7 # 2xwsxw # 9r o w d j h 43 9 d 9 287 2 d 7r s w 2xwsxw # 9r o w d j h # 7hpshudwxuh &rhiilflhqw , 287 43 p$ 073 ?& 7r s w ;8 ?& ? 433 ssp 2 ?& 5 3' 3xoo # grzq # uhvlvwdqfh # iru # &( slq 7 0 w 9 &(+ &( # ,qsxw # 9r o w d j h # + 418 9 ,1 9 9 &(/ &( # ,qsxw # 9r o w d j h # / 3 3158 9 *1) the output current depends on the performance of external pnp transistor. use external pnp transis- tor of a low saturation type, with an h fe between 100 and 300. *) with respect to test circuit, refer to typical application.
rn5rf 6 operation 2 5 1 v out gnd v dd ce vref 3 current limit + - 4 ext in gnd rn5rf a pnp tr ra rb c l c out gnd ,q # wkhvh # ,&v /# 2xwsxw # 9r o w d j h # 9 287 # lv # ghwhfwhg # e\ # )hhg 0 edfn # 5hvlvwruv /# 5 $ # dqg # 5 % # dqg # wkh # ghwhfwhg # 2xwsxw # 9r o w d j h lv # frp 0 sduhg # zlwk # d # uhihuhqfh # yrowdjh # e\ # (uuru # $psolilhu # vr # wkdw # wkh # edvh # fxuuhqw # ri # ([whuqdo # 313 # 7udqvlvwru # fdq # eh dgmxvwhg # dqg # 2xwsxw # 9r o w d j h # 9 287 # lv # deoh # wr # eh # uhjxodwhg 1 7kh # edvh # fxuuhqw # ri # dq # h[whuqdo # 7u 1# lv # prqlwruhg # dqg # frqwuroohg # e\ # dq # lqwhuqdo # %dvh # &xuuhqw # /lplw # flufxlw # wr # nhhs fxuuhqw # zlwklq # d # surshu # udqjh 1## )xuwkhupruh /# wkh # rwkhu # fxuuhqw # olplw # flufxlw # suhyhqwv # d # sureohp # zklfk # lv # wkdw # d # edvh fxuuhqw # lqfuhdv 0 hv # vkduso\ # zkhq # lqsxw # 9r o w d j h # 9 ,1 # ehfrphv # orzhu # wkdq # 6hw # 2xwsxw # 9r o w d j h 1 notes on selecting external components +4, 2q # h[whuqdo # 313 # wudqvlvwru %h # fduhixo # ri # rxwsxw # fxuuhqw /# lqsxw # yrowdjh # dqg # srzhu # glvvlsdwlrq # ri # ([whuqdo # 313 # 7udqvlvwru 1 ([whuqdo # 313 # 7udqvlvwru # zlwk # d # orz # 9 &( #+ vdw ,# dqg # dq # k )( # ehwzhhq #433# dqg #633# lv # vxlwdeoh 1 +5, 2q # skdvh # frpshqvdwlrq # ,q # wkhvh # ,&v /# skdvh # frpshqvdwlrq # lv # pdgh # iru # vhfxulqj # vwdeoh # rshudwlrq # rq # wkh # rxwsxw vwdjh # hyhq # li # wkh # ordg # fxuuhqw # lv # ydulhg 1## )ru # wklv # sxusrvh /# eh # vxuh # wr # xvh # d # fdsdflwru # & / #+ wdqwdoxp # w\sh ,# zlwk # d fdsdflwdqfh # ri #43 ?) # ri # pruh 1## 7khuh # pd\ # eh # wkh # fdvh # wkh # orrs # rvfloodwlrq # wdnhv # sodfh # zkhq # d # wdqwdoxp # fdsdflwru & / # zlwk # d # odujh # (65 # lv # xvhg /# vr # vhohfw # wkh # & / # fduhixoo\ # lqfoxglqj # wkh # iuhtxhqf\ # fkdudfwhulvwlfv 1
rn5rf 7 test circuits pnp ext v out out 10 f gnd ce 10 f v dd in rn5rf a 5 1 3 4 2 i out pnp ext v out out 10 f gnd ce 10 f v dd in rn5rf a 5 1 3 4 2 i ss basic test circuit test circuit for supply current pnp ext v out out 10 f gnd ce v dd in rn5rf a 5 1 3 4 2 p.g i out pnp ext v out out 10 f gnd ce 10 f v dd in rn5rf a 5 1 3 4 2 test circuit for ripple rejection and line transient response test circuit for load transient response
rn5rf 8 typical characteristics 1) output voltage vs. input voltage (topt=25c) rn5rf30a rn5rf50a 3.20 2.60 2.40 2.20 3.00 2.80 2.00 input voltage v in (v) output voltage v out (v) 2345678910 i out =0ma i out =100ma i out =500ma 5.20 4.60 4.40 4.20 5.00 4.80 4.00 input voltage v in (v) output voltage v out (v) 45678910 i out =0ma i out =100ma i out =500ma 2) output voltage vs. output current (topt=25c) rn5rf30a rn5rf50a 3.10 2.95 2.90 2.85 3.05 3.00 2.80 output current i out (ma) output voltage v out (v) 0 100 200 300 400 500 v in =4v 5.10 4.95 4.90 4.85 5.05 5.00 4.80 output current i out (ma) output voltage v out (v) 0 100 200 300 400 500 v in =6v 3) dropout voltage vs. output current rn5rf30a rn5rf50a 0.50 0.20 0.40 0.30 0.10 0.00 output current i out (ma) dropout voltage v dif (v) 0 300 100 200 400 500 topt=-40 topt=25 topt=85 0.50 0.20 0.40 0.30 0.10 0.00 output current i out (ma) dropout voltage v dif (v) 0 300 100 200 400 500 topt=-40 topt=25 topt=85
rn5rf 9 4) output voltage vs. temperature rn5rf30a rn5rf50a 3.10 3.00 3.05 2.95 2.90 temperature topt( ) output voltage v out (v) -50 25 -25 0 50 75 100 v in =4v,i out =10ma 5.10 5.00 5.05 4.95 4.90 -50 25 -25 0 50 75 100 v in =6v,i out =10ma temperature topt( ) output voltage v out (v) 5) supply current vs. input voltage (topt=25c) rn5rf30a rn5rf50a 100 60 50 80 70 90 40 30 20 10 0 input voltage v in (v) supply current i ss ( a) 04 26810 i out =0ma 100 60 50 80 70 90 40 30 20 10 0 input voltage v in (v) supply current i ss ( a) 04 26810 i out =0ma 6) supply current vs. temperature rn5rf30a rn5rf50a 50 30 40 20 10 0 temperature topt( ) supply current i ss ( a) -50 0 -25 25 50 75 100 v in =4v,i out =0ma 50 30 40 20 10 0 temperature topt( ) supply current i ss ( a) -50 0 -25 25 50 75 100 v in =6v,i out =0ma
rn5rf 10 7) ripple rejection vs. frequency (topt=25c) rn5rf30a rn5rf50a 80 70 50 60 40 20 30 10 0 frequency (khz) ripple rejection (db) 0.01 0.1 1 10 100 v in =4vdc+0.5vp-p,i out =100ma,c l =10 f 80 70 50 60 40 20 30 10 0 frequency (khz) ripple rejection (db) 0.01 0.1 1 10 100 v in =6vdc+0.5vp-p,i out =100ma,c l =10 f 8) line transient response (topt=25c) rn5rf30a rn5rf50a 6 5 4 3 2 1 0 time t( s) input voltage v in (v) -50 0 -25 25 50 75 100 125 150 i out =300ma,c l =10 f 3.3 3.2 3.1 3 2.9 2.8 2.7 output voltage v out (v) input voltage output voltage 8 7 6 5 4 3 2 time t( s) input voltage v in (v) -50 0 -25 25 50 75 100 125 150 i out =300ma,c l =10 f 5.3 5.2 5.1 5 4.9 4.8 4.7 output voltage v out (v) input voltage output voltage 9) load transient response (topt=25c) rn5rf30a rn5rf50a 200 100 0 -100 -200 -300 -400 3.3 3.2 3.1 3 2.9 2.8 2.7 time t( s) output current i out (ma) output voltage v out (v) -100 0 100 200 300 400 v in =4v,c l =10 f output current output voltage 200 100 0 -100 -200 -300 -400 time t( s) output current i out (ma) -100 0 100 200 300 400 v in =6v,c l =10 f 5.3 5.2 5.1 5 4.9 4.8 4.7 output voltage v out (v) output current output voltage
rn5rf 11 typical application pnp tr ext out cap. + gnd ce v dd in rn5rf a v out cap. +

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