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| low ripple voltage regulator with external transistor 1 no. ea-043-0204 outline ! " ! " #$ % % % ! & % ! ! & # % % %&' &'# " " ! % " % "# & ! & % && !()' ! *" * # +,- . * # features ? / 0 " ###########################################" #,12' ? " ###############################################################" #1#32' ? 4 ' " 5 ####################################6+#17 ? 4 ##################################################" #819:%;3*4< ? 0) 5 ###################################################" #1#35: ;311&'! $ # ? 0& ) % ################################################" #6311 &:= ? 4 0 ###################################################" #1#17:5 ? 5 ############################################################## % 1#35 % 3#+5 8#15 ? 0 & % ######################################" #>&'!0 & applications ? ( % " ? & ? && ! & !5 ? ( % & rn5rf 2 block diagram rn5rfxxa rn5rfxxb 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 ! " ! * " " % @ ? # & " & a b ( & code contents 5 -5 .a %1#35 %3#+58#15 # ) % ' " 'ac0d " 9ac4d " ) %( * " 'a a' "% & ) % " $ #!0- % % !" #. 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 3 e) e ( +5 ( ,5 ( f $g $ ) ( - . $ $ $ ( absolute maximum ratings symbol item rating unit 5 5 3+ 5 5 5 % $:$( 1#,5 h1#, 5 5 $g 5 1#,5 h1#, 5 $g 1 &' ( ( ) 31 &i & f1h> = & h3+ = absolute maximum ratings ' && & & % " # ! % " & & & "# & && & " & & # " " & "% & # rn5rf 4 electrical characteristics ? rn5rfxxa ;+= symbol item conditions min. typ. max. unit 5 5 ; ;1&' 1#j> 3#1+ 5 5 5 ;3#15 3#1 ' $g 5 ;f#15!5 ;+#15 > 3 &' ? 5 : ? 0 5 5 ;3#15 3&' 311&' 81 81 &5 5 ) 5 ;311&'! ;1&' 1#3 1#+ 5 " 5 5 ;3#15 ,1 1 2' " " 5 ;31#15 1#13 1#31 3#11 2' $g0 * 1# 2' ? 5 : ? 5 0 ;1&' 5 h1#5 5 315 1#11 1#1 1#,1 7:5 %;3*4 $g 5 31 5 ? 5 : ? 5 & %% ;31&' f1= >= 6311 &:= ( % $ f ? 5 ce 5 c4d 3# 5 5 5 ce 5 c0d 1#11 1#+ 5 *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 ? rn5rfxxb ;+= symbol item conditions min. typ. max. unit 5 5 5 5 ;3#15 ;1&' 1#j> 3#1+ 5 5 5 ;3#15 3#1 ' $g 5 ;f#15!5 ;+#15 > 3 &' ? 5 : ? 0 5 5 ;3#15 3&' 311&' 81 81 &5 5 ) 5 ;311&' 1#3 1#+ 5 " 5 b5 ;3#15 ;1&' ,1 1 2' " " 5 ;31#15 1#13 1#31 3#11 2' $g0 * 1# 2' ? 5 : ? v 0 ;1&' 5 h1#5 5 315 1#11 1#1 1#,1 7:5 %;3*4 $g 5 31 5 ? 5 : ? 5 & %% ;31&' f1= >= 6311 &:= ( % $ f ? 5 $ 5 c4d 3# 5 5 5 $ 5 c0d 1#11 1#+ 5 *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 rn5rfxxa pnp tr ra rb c l c out gnd ! 5 5 "% * ! & % " & % % (( 5 # % # & " & * # & ! & & " !5 & # notes on selecting external components -3. (( 9 %% ! % (( # $ (( 5 - . 311 ,11 # -+. & ! & & % % # ! - &" . %312% & # & " * & $ ! %" % ? " # rn5rf 7 test circuits pnp ext v out out 10 f gnd ce 10 f v dd in rn5rfxxa 5 1 3 4 2 i out pnp ext v out out 10 f gnd ce 10 f v dd in rn5rfxxa 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 rn5rfxxa 5 1 3 4 2 p.g i out pnp ext v out out 10 f gnd ce 10 f v dd in rn5rfxxa 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=25 c) 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=25 c) 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=25 c) 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=25 c) 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 rn5rfxxa v out cap. + components transistor: 2sb766a capacitor: 10f (tantalum type) |
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