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| step-down dc/dc converter with vr and reset 1 no. ea-102-0301 outline !"# # "$% % &" ! $ ' (%()' %*+, " $ ' ( %*+#,-! ' !) '. )%%" / 0 " / " '' %- " % ' % ) - %/%" $ ' ()" - "%% % & '/%- / % % ) - )%%" '& % ) - & " " % ) - % % " / % $ ' ( % ) - " ) ) %$% % " %- " " 1' !% '-(// " . !"# # "$% % " '. & / 0! & %" ' & "" - % "" ) %- - " % '' %/%2)" .3456- %/ %& ''" ) % " % ") ! 0 7)% %- 0 2) )" % $ ' ( ' 4 ) /)" " *8+9, 0/ " ) $ ' ( & + *. , % '- ) ) / # # "$% % )%" // 5 !$%-& $ ' (%()' % " % " ") % $ ' (%()' % " / %/%" $ ' ()" - % %" / %$ ' ( % ) - "%% % & ' /%- " ) ) %$% % " %- " " )' "$ ' ( %) %$ " ) $ ' ( " ) ) : ""' " % " . !% " % ' . & ' " ') " " %" ''. . ''. & features ? "( /0" ) + ' ( ;+< + ? =)' " / % 7)" "*. &, " )' " !% "% ' .*. &, ? &)&) ) )%%" &1*# #,-&1*+, ? 5(1 )% .) ) + ' ( > ?*# # " + ' (()' %) ) , ? 1 )% . /$ ' ( % > ? ? ) ) + ' (*+, ! "(! / +" % "( / + @+ ? ) ) + ' (*# #, ! "(! / +" % "( / + + ? ) ) + ' (*+#, ! "(! / +" % "( / + + ? 4 ( @ * 4"a &&, %5:@* 4"a b&&, applications ? !% )% / % " ' &&)" "2) &" -# %#+# %$ ? !% )% / % %. !% 2) &" r5210x 2 block diagram v in l x v out2 gnd current limit control output control - + + - - + v out1 current limit soft start delay circuit u.v.l.o. vref vref vref + - - osc v d out selection guide 0" %- ) ) $ ' ( &" "/ % 0 "' )%c%2) ' " "& ! (" "( % ")&% !"' !d % :)&% code contents #(" "( 4 ( . a :a@ #a5:@*8" %#$' &" , ) ) + ' ( &" " :)&% #(" " / " '7)" " * " % , #(" " / "(. a/% "( / " r5210x 3 pin configurations ? sot-23-6w ? ? ? ? hson-6 12 3 64 (mark side) 5 654 123 (mark side) r5210nxxxx r5210dxxxx pin description pin no. r5210n r5210d symbol description + ) ) " /+ ' (()' % + ) ) " /+ ' (# %*: ""' " % " ) ) . , + # # "$% % !") ) & " %"( " 9 ! "( "* ""' " % " ) ) . , e:# e% )" " @@+ + ' () '. " absolute maximum ratings e:#f+ symbol item rating unit + + "+ ' ( @ + + 9 "+ ' ( <+ g + + + "+ ' ( <+ g + + + "+ ' ( <+ g + + + "+ ' ( <+ g + 0 9 ") ) )%%" 3 &1 0 + ") ) )%%" &1 !%# "*@ , & !%# " *5:@ 8" %#$' &" , & % "(& % )% "( + ' ( + + + 8+9' + ' ( @ + dc/dc part symbol item conditions min. typ. max. unit + # #) ) + ' ( + f +- " ' @@ ; ; + ? + ? # #) ) + ' ( & % )% // " h 3h > & h / '' %7%2)" . + f + @ 3 b@ 456 ? / ? '' %7%2)" . & % )% // " h 3h 456 h 9 " " + f +-0 f&1 3 ? 0 99 4 ()%%" + f+ f +-+ f+ i1 0 9)%%" 9& + f + @ ; &1 . &)& ) . . ' ? % / % & + f + ; & vr part symbol item conditions min. typ. max. unit + +) ) + ' ( + f +-0 f&1 @3 + 0 &)&) ) )%%" / + + f + &1 + +9 ()' " + f +-&1 0 3&1 ; &+ + #% ) + ' ( 0 f&1 + 0 % )%%" 9& + f+ &1 ? + ? +) ) + ' (& % )% // " h 3h > & h r5210x 5 vd part symbol item conditions min. typ. max. unit + +## %% ' b + ? + ? +## %% ' & % )% // " h 3h > & h + 5. % "( + + 95 +#) ) #' .&/ % ' & 0 + j9k) ) )%%" + f +-+ f + ; &1 typical application and application hints ? r5210nxxxc v out2 v out2 v out1 v dout v dout v out1 v in gnd l x c2 d1 l1 - + c3 r1 c1 - + examples of components 0" ) %9 a 9l5*)% -i5, %9#@*#m, 4.# # a =b#* &, % l9*: "0" %, )'') % a 4 ? % a fi7*% & %,ai7* " ')& %,ai7* " ')& %, ". )) 0- " % / '' !"()d ? %" ' & "" ' ' 0 " &"&6 "" " !" & "" " 0 0" % )' %- % )' "" !"+ " e:#! &"&)& "" " 4 )// " (% )" "(- " %"/ % ) '."( 1' %(! "( )%%" /' ! % )( "" " / !%) '.- "" ) % " "" " /+ 0/ & " / "" " / !%) '. %(% )" (- $ ' ('$' / !%) '. / 0/') ) ! ! "( )%%" & . ))" ' % " / 0 r5210x 6 ? 8 %! . /i7 %& %/ %+ " e:#- " ! ' ! % & . 0" %& /+ - ) %! . /i7 %& %- " ! ( (/%2)" . % % ) " ')& % ? "" ) % )// " '.& ''# % " " ' %( '' ! ' )%%" " ! % % & (" )% " 0/ $ ') / " ) " / " " ) % %&'. & ''- 0 - ! /' ! % )( 9 % " % " "" ) %-& . ') & &)&% "( & &)&' "( 8 "" ) %! % % " ) " ? 8 / 4. . ! (! "( - " ' . " " )%%" . ? 0/ 4" /9 " ' %(-& 4") % ) *) % ' "" " /, !"9 " e:#- " " !''% ) & " " / " " ) ' =- $ ') " ) ' = ? 0/ ' )%%" / $ ' (%()' %& ''- ) / ! "(" /# # "$% %- ) ) $ ' ( /+ & .' %( $ -) $ ' (%()' %! ' )%%" ' &1 ? %/ %& " / !% )% % ) )"( 0 %&'. " ) " % % ' % ) . " "" ' " / % % ' % ) 0" % )' %- (" % % ' % ) " ! . $ ')) $ ' (- )%%" - " !% / & "" - = %" " 0 " % % % $ ') r5210x 7 operation of step-down dc/dc converter and output current !"# # "$% % %("%(." " ) %!"9 % " %:- " %( " %(./% & " ) %!"9 % " %77 " " % '! '"%(.' - ' !% ) ) $ ' ( " " ) $ ' ( " % "!'' ' " ! %/%" / '' !"( (% &a )%%" 09*f,/' !- " "%(. %( " 9 1 & &" -09" % /% & 09&"*f, % 09& " % % " " & % * ", /9n% a "9% )%" //- 4. *#, )%" "" % % 9& " "09 09& - " )%%" 09 *f,/' ! a 09 % (% ) ''. " % 09&" / % & % / "- " # )%" //- % $ " " ") )& -" . ' % / %09 & ) // &" " )( 0" -09 $ ')/% & 09&"*o, 0" / " % '. &- ) ) $ ' (& " " . " % ''"( " & % * ",-! '' %/%2)" .*/ ,"(& " " " " r5210x 8 ? discontinuous conduction mode and continuous conduction mode & &)&$ ')*09& , " &"&)&$ ')*09&", )%%" ! /' ! % )( " ) % & !"9% )%" " " !" )%" // //%" !"09& " 09&"-! % %" . ? 0d ? 0f09& 09&"f+ " 9f*+ + , " 9 2) " %- f / f "g // ) .*?,f " f " / " // 0"2) "-+ " 9 " *+ + , " 9 %% $'. !" "( / )%%" :- " "( / )%%" 77 " ) ) )%%" *0 ,%' $'.& ''- "p // '') % " $ (% & 0" - "%(. %( " " ) % )%"( & % / " " %( " " %'. )%"( & % / //- %/ %09&" & 6% *09&"f, "0 (% ) ''." % -$" ) ''.- " & //* "f //,- " !"0 /)% %" % -09&" &' %(% "6% *09&"o, / %&%& %/%% " ") )& " ' %& %/%% " ") )& 0" " ") )& -!"2) " '$ / % " " )& ') " " - " f + + 2) " " "p " - & " ") )& - " !" "f " - & " ") )& output current and selection of external components "9% j:ka * %"- ')%%" $ ') % 0 -:% " /9 % % % )%%" / " ) % % , + f+ g* g , 0 g9 0 " 2) " "9% j77ka 9 0 //f+ g+ g 0 2) " ) 2) " 2) " " '$/ %: ) .- " * //g ",f# - # f*+ g+ g 0 , *+ g+ 0 , 2) " ')%%" / '' !d 0 f*+ + 0 0 , # / 9 2) "@ %"- 4 )%%" /' ! % )(9-9% - " # / '' !d 09& f0 g0 2) "; " %09& - " " /" ) " ) ) " ' %" ' & "" $ ' " " % ' )' "" " ' " " ") )& r5210x 9 timing chart (-v det +v hys ) -v det v uvlo2 v uvlo1 v in voltage v out1 voltage v dout voltage v out2 voltage l x voltage soft-start time vd delay for release vd delay for release &"( % ! !"" %$ ) ( % %' " /) '.$ ' ( "(! & " ) ) /# # "$% %-$ ' ( %- " $ ' (%()' % (1) dc/dc converter " !% )%" " " " /%"( + $ ' (-!' + $ ' ( 8+9%' '$' *+ , % '- % " / # # "$% % " " & 4 ! "(- %/ % + $ ' ( " % " + $ ' ( &8+9%' '$' %& %- # # "$% % % / % % "- " % ! "(- "+ !''% 1/ % / % &-/+ $ ' ( & + '$' %& %-+ !'' ' + ) ) $ ' ( 0/+ $ ' ( & 8+9 % % ' '$' *+ , %'- # # "$% % ! "( "9 % " %" 0 )%" // (2) voltage detector 0/ + $ ' ( +# % % ' '$' %'- : ""' % " % /+ " )%" " " ) ) j9k + " "-!" + $ ' ( &+# % % ' '$'g . %% "( *+ g+ , %& %- / %+# ' ./ %%' * 95, "(- : ""' % " %" 0 )%" //- + "$ ' (% )'') $ ' ( = - %' % ) / %+# % / % / % & " )" % " "-+ $ ' ( )' *+ g+ , %& % r5210x 10 (3) voltage regulator $ ' (%()' % '! . % $"/8+9/)" "! )' ! %4 %/ %-+ $ ' (" %'.2) ' + $ ' ( 1 ) '$ ') " " ' )%%" " + $ ' ( & + $ ' ( %& %- + $ ' (!'' ) ) $ ' ( test circuits a) supply current b) uvlo detector threshold/ released voltage v in v out1 gnd a v in l x v out1 gnd oscilloscope c) lx leakage current d) lx on resistance v in l x v out1 gnd a v in l x v out1 gnd v e) lx current limit f) v out1 output voltage v in l x v out1 gnd oscilloscope v in l x v out1 gnd oscilloscope v out2 r5210x 11 g) oscillator frequency, soft-start time v in l x v out1 v out1 gnd oscilloscope oscilloscope h) v out2 output voltage, load regulation, dropout i) v dout detector threshold, hysteresis range, voltage, current limit, short current limit vd output delay time for release v in l x v out1 i out2 gnd v out2 v v in l x v out1 gnd oscilloscope v dout j) v dout ?l? output current v in v out1 gnd vd out a . ' % % !% " ! )"( % ) / '' !d . '1 ' "% ) a. ' % % ,,,, % ) 7 a. ' % % , % ) e a. ' % % @,;, % ) 5 a. ' % % ,b,, % ) 0 a. ' % % ,3, r5210x 12 typical characteristics 1) output voltage vs. output current 2) efficiency vs. output current r5210n001c r5210n001c 2.8 2.75 2.7 2.65 2.6 output voltage v out1 (v) 0 200 100 400 300 500 output current i out1 (ma) l1=22 h, c1=10 f v out1 =2.7v, i out2 =0ma v in =4.5v v in =5.0v v in =5.5v 100 90 80 50 30 40 60 70 20 0 10 efficiency (%) 0 200 100 400 300 500 output current i out1 (ma) l1=22 h, c1=10 f v out1 =2.7v, i out2 =0ma v in =4.5v v in =5.0v v in =5.5v 3) dc/dc output voltage vs. temperature 4) vr output voltage vs. temperature r5210n001c r5210n001c 2.80 2.75 2.70 2.65 2.60 output voltage v out1 (v) -50 0 -25 50 25 100 75 temperature topt(?c) 3.50 3.45 3.40 3.35 3.30 output voltage v out2 (v) -50 0 -25 50 25 100 75 temperature topt( ? c) 5) detector threshold vs. temperature 6) oscillator frequency vs. temperature r5210n001c r5210n001c 4.4 4.3 4.2 4.1 4.0 detector threshold-v det (v) -50 0 -25 50 25 100 75 temperature topt( ? c) 1000 900 800 700 600 frequency fosc(khz) -50 0 -25 50 25 100 75 temperature topt( ? c) r5210x 13 7) soft-start time vs. temperature 8) output delay time for release vd vs. temperature r5210n001c r5210n001c 4.0 3.0 2.0 1.0 0.0 soft-start time tss(msec) -50 0 -25 50 25 100 75 temperature topt( ? c) 20 12 16 8 4 0 output delay time for release vd tplh(msec) -50 0 -25 50 25 100 75 temperature topt( ? c) 9) vr output voltage vs. output current 10) vr output voltage vs. output current (zoomed) r5210n001c r5210n001c 4 2.5 2 1 3.5 3 1.5 0.5 0 output voltage v out2 (v) 0 100 50 200 150 300 250 output current i out2 (ma) 3.43 3.41 3.4 3.38 3.42 3.39 3.37 3.36 output voltage v out2 (v) 0 100 50 200 150 output current i out2 (ma) 11) load transient response 1 12) load transient response 2 l1=22 h, c1=10 f v out1 =2.7v 1 2 ch2 ch1 100mv 500mv ch1 m 50.0 s 200mv i out1 =10ma i out1 =200ma l1=22 h, c1=10 f v out1 =2.7v 1 2 ch2 ch1 100mv 500mv ch1 m 200 s 200mv i out1 =200ma i out1 =10ma |
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