ksd-i0s003-004 1 a278rxxpic ldo fixed regulator ic description the a278rxx series is a low dropout voltage regulator suitable for various electronic equipments. it provides constant voltage power source with to-220f-4sl lead fu ll-mold package. dropout voltage of a278rxx series is below max.0.5v in full rated current (2.0a). this regulat or has various functions such as current limit protection, over voltage protection and output on/off control. features pin connection ? 2.0a output low dropout regulator ? to-220f-4sl full-mold package (4pin) ? current limit protection ? over voltage protection ? thermal shutdown protection ? with output on/off control (at typical 1.5v) ? control pin open or high signal, output on device selection guide device output voltage a278r33pic 3.3v a278r35pic 3.5v A278R05PIC 5.0v a278r06pic 6.0v a278r08pic 8.0v a278r09pic 9.0v a278r12pic 12.0v product marking package a278rxxpic a278rxxpi to-220f-4sl 1 1. input 2. output 3. ground 4. on/off control 2 3 4 a278rxxpi( ) yyww( ) ordering information device code year & week code
ksd-i0s003-004 2 a278rxxpic block diagram absolute maximum ratings [ta=25 ] characteristic symbol rating unit 18(all others) v input voltage v i 25(a278r12pic) v control input voltage v ct 18 v p d1 (no heatsink) 2.0 w power dissipation p d2 (with heatsink) 20 w junction temperature t j 150 c operating temperature range t opr -20 ~ 80 c storage temperature range t stg -55 ~ 150 c
ksd-i0s003-004 3 a278rxxpic electrical characteristics (v i = v o +2v, io = 1.0a, v ct(high) =2.7v, t a = 25c, unless otherwise specified) electric characteristic symbol conditions min. typ. max. unit a278r33pic - 3.22 3.3 3.38 v a278r35pic - 3.41 3.5 3.59 v A278R05PIC - 4.88 5.0 5.12 v a278r06pic - 5.85 6.0 6.15 v a278r08pic - 7.80 8.0 8.20 v a278r09pic - 8.78 9.0 9.22 v output voltage v o a278r12pic - 11.7 12.0 12.3 v line regulation v o( vi) note1, i o =1.0a - 0.5 2.5 % load regulation v o( il) 5ma i o 2.0a - 0.1 2.0 % quiescent current i qc i o =0ma - - 10 ma ripple rejection ratio rr (v o +2v) v i 12v, i o =50ma f=120hz 45 55 - db i o =1.0a - - 0.3 v dropout voltage v drop i o =2.0a - - 0.5 v control voltage high v ct(high) i o =0ma, output on 2.0 - - v control voltage low v ct(low) i o =0ma, output off - - 0.8 v control bias current high i ct(high) v ct(high) = 2.7v - - 20 a control bias current low i ct(low) v ct(low) = 0.4v - - -0.4 ma note 1. a278r33: v i =4.3v~12v a278r35: v i =4.5v~12v a278r05: v i =6v~12v a278r06: vi=7v~15v a278r08: v i =9v~16v a278r09: v i =10v~16v a278r12: v i =12v~16v ? ? ? test circuit of a278rxxpic
ksd-i0s003-004 4 a278rxxpic electrical characteristic curves fig.2 t a vs. p d ambient temperature t a [ ? c] 100 50 25 25 15 125 75 150 20 5 10 0 0 power dissipation p d [w] without heat sink relative output voltage [%] output current i o [a] 1.6 0.8 2.4 0 4.8 4.0 3.2 100 60 80 40 20 0 a278rxxpic fig.1 i o vs. v o fig.3 v i vs. i qc quiescent current i qc [ma] 30 18 24 12 6 0 4 2 6 0 12 10 8 input voltage v i [v] a278r33pic v i =0v~12v i o =0.0a fig.6 v i vs. i qc quiescent current i qc [ma] 30 18 24 12 6 0 5.0 2.5 7.5 0 15.0 12.5 10.0 input voltage v i [v] a278r08pic v i =0v~15v i o =0.0a fig.7 v i vs. i qc quiescent current i qc [ma] 3 0 1 8 24 1 2 6 0 5.0 2.5 7.5 0 15.0 12.5 10.0 input voltage v i [v] a278r09pic v i =0v~15v i o =0.0a fig.4 v i vs. i qc quiescent current i qc [ma] 3 0 1 8 24 1 2 6 0 4 2 6 0 12 10 8 input voltage v i [v] i o =1.0a i o =2.0a A278R05PIC v i =0v~12v i o =0.0a
ksd-i0s003-004 5 a278rxxpic electrical characteristic curves relative output voltage [%] control voltage v ct [v] 1.0 0.5 1.5 0 3.0 2.5 2.0 125 75 100 50 25 0 a278rxxpic fig.10 v ct vs. v o fig.11 t j vs. v o output voltage v o [v] 5.2 5.0 5.1 4.9 4 .8 4.7 25 0 50 -25 125 100 75 junction temperature t j [ ] A278R05PIC i o =1.0a fig.9 t j vs. i qc quiescent current i qc [ma] 5 3 4 2 1 0 25 0 50 -25 125 100 75 junction temperature t j [ ] a278rxxpic i o =0.0a fig.8 v i vs. i qc quiescent current i qc [ma] 50 30 40 20 10 0 8 4 12 0 24 20 16 input voltage v i [v] a278r12pic v i =0v~20v i o =0.0a
ksd-i0s003-004 6 a278rxxpic outline dimension
ksd-i0s003-004 7 a278rxxpic the auk corp. products are intended for the use as components in general electronic equipment (office and co mmunication equipment, m easuring equipment, home appliance, etc.). please make sure that you consult with us before you use these auk corp. products in equipments which require high quality and / or reliability, and in equipments which could have major impact to th e welfare of human life(atomi c energy control, airplane, spaceship, transportation, co mbustion control, all types of safety device, etc.). auk corp. cannot accept liability to any damage which may occur in case these auk corp. products were used in the mentioned equi pments without prior consultation with auk corp.. specifications mentioned in this publicati on are subject to change without notice.
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