1/6 axelite confidential materials, do not copy or distribute without written consent . rev. 1. 2 feb. 29 , 20 11 AX78L05 3 - terminal 100 ma positive voltage regulator ? general description the AX78L05 of positive voltage regulator is inexpensive, easy - to - use devices suitable for a multitude of applications that require a regulated supply of up to 100ma. like their higher power AX78L05 , th is regulator feature internal current limiting and thermal shutdown making them remarkably rugged. no external components are required with the AX78L05 device in many applications. th e device offer a substantial performance advantage over the tr aditional zener diode - resistor combination, as output impedance and quiescent current are substantially reduced. ? features - output voltage range 3.3 to 24v - output current up to 100ma - no external components required - internal thermal overload protection - inter nal short - circuit current limiting - output transistor safe - area compensation - output voltage offered in 4% tolerance ? pin assignment the package of AX78L05 is so t89 - 3 l; the pin assignment is given by : vou t gnd vin 1 32 ax 78l 05 (sot 89 -3l) v?mw`r?y?b? w w w . g o f o t e c h . c o m
2/6 axelite confidential materials, do not copy or distribute without written consent . rev. 1. 2 feb. 29 , 20 11 AX78L05 ? order/marking information order information top marking ? a bsolute m aximum r atings ( t a = 25 c unless otherwise noted ) characteristics symbol rating unit dc input voltage v in 35 v power dissipation (multi - layer pcb cupper area 5mm*5mm) t a =25 o c, t j =125 o c, sot89 p d 625 mw operating junction temperature t j - 40 ~ +125 c storage temperature range t stg - 65 ~ + 150 c p a c k a g e t y p e a x 7 8 l 0 5 x p a c k i n g b l a n k : t u b e f : s o t 8 9 - 3 l x a : t a p i n g y m l g p i 0 5 o u t p u t v o l t a g e y = y e a r c o d e l = l o t c o d e m = m o n t h c o d e ( a = j a n , b = f e b , c = m a r , d = a p l , e = m a y , f = j u n , g = j u l , h = a u g , i = s e p , j = o c t , k = n o v , l = d e c ) v?mw`r?y?b? w w w . g o f o t e c h . c o m
3/6 axelite confidential materials, do not copy or distribute without written consent . rev. 1. 2 feb. 29 , 20 11 AX78L05 ? e lectrical c haracteristics (v in =10v, i o ut = 40ma, 0 o c ? t j ? 125 o c, c in =0.33uf, c out = 0.1uf; unless otherwise specified.) characteristics symbol conditions min typ max units output voltage v out t j =2 5 c 4.80 5 5.20 v 7.5v ? v in ? 20v, 5ma ? i out ? 100ma 4.75 5 5.25 line regulation regline t j =2 5 c 7.5v ? v in ? 20v i out =100ma - 50 150 mv load regulation regload t j =2 5 c 5ma ? i out ? 100ma - 20 60 5ma ? i out ? 40ma - 10 30 quiescent current iq i out =0, t j = 25 c - 3 6 ma quiescent current change iq 7.5v ? v in ? 20v - - 1.5 5ma ? i out ? 40ma - - 0.1 output noise voltage vn 10hz ? f ? 100khz, t j = 25 c - 40 - v ripple rejection ratio p srr f=120hz, 7.5v ? v in ? 20v 41 49 - db voltage drop vdrop i out = 100ma, tj=25 o c - 1.7 - v peak output curr ent io peak t j = 25 o c - 0.15 - a temperature coefficient of output voltage v out / t j i out = 5ma, 0 o c ? t j ? 125 c - - 0.65 - mv/ c note 1 : pulse testing techniques are used to maintain the junction temperature as close to the ambient temperature as possib le and thermal effects must be taken into account separately. note 2 : this specification applies only for dc power dissipation permitted by absolute maximum ratings. ? a pplication c ircuit input gnd vin vout output ax 78 l 05 c 1 c 2 0 . 33 uf tant . 0 . 1 uf tant . v?mw`r?y?b? w w w . g o f o t e c h . c o m
4/6 axelite confidential materials, do not copy or distribute without written consent . rev. 1. 2 feb. 29 , 20 11 AX78L05 ? a pplication i nformation design con siderations the AX78L05 of fixed voltage regulator is designed with thermal overload protection that shuts down the circuit when subjected to an excessive power overload condition. internal short circuit protection l imits the maximum current the circuit w ill pass. in many low current applications, compensation capacitors are not required. however, it is recommended that the regulator input be bypassed with a capacitor if the regulator is connected to the power supply filter with long wire lengths, or if the output load capacitance is large. the input bypass capacitor should be selected to provide good high-frequency characteristics to insure stable operation under all load conditions. a 0.33uf or larger tantalum, mylar, or other capacitor having low internal impedance at high frequencies should be chosen. the bypass capacitor should be mounted with the shortest possible leads directly across the regulators input terminals. good construction techniques should be used to minimize ground loops and lead resistance drops since the regulator has no external sense lead. bypassing the output is also recommended. figure 1 C current regulator the AX78L05 regulator can also be used as a current source when connected as above. in order to minimize dissipation the ax7 8l05 is chosen in this application. resistor r determines the current as follows: v?mw`r?y?b? w w w . g o f o t e c h . c o m
5/6 axelite confidential materials, do not copy or distribute without written consent . rev. 1. 2 feb. 29 , 20 11 AX78L05 i ib =3.8ma over lined and load changes for example, a 100ma current source would require r to be a 50. 1/2w resistor and the output voltage compliance would be the inp ut voltage less 7v. figure 2 C ? 15v tracking voltage regulator v?mw`r?y?b? w w w . g o f o t e c h . c o m
6/6 axelite confidential materials, do not copy or distribute without written consent . rev. 1. 2 feb. 29 , 20 11 AX78L05 ? p ackage o utlines symbol dimensions in millimeters dimensions in inches min. nom. max. min. nom. max. a 1.40 1.50 1.60 0.055 0.059 0.06 3 b 0.36 0.42 0.48 0.014 0.017 0.019 b1 0.44 0.50 0.56 0.017 0.02 0.022 c 0.35 0.40 0.44 0.014 0.016 0.017 d 4.40 4.50 4.60 0.173 0.177 0.181 d1 1.35 1.59 1.83 0.053 0.063 0.072 e 3.0 bsc 0.118 bsc e1 1.5 bsc 0.059 bsc e 2.29 2.45 2.60 0.09 0.097 0.102 he 3.94 4.10 4.25 0.155 0.161 0.167 l 0.80 1.00 1.20 0.031 0.04 0.047 jedec outline: to-243 ab l h e e d 1 e 1 e a d b 1 b b 8 0 ( 2 x ) 1 . 7 c 0 . 4 0 . 9 2 . 7 1 . 3 1 . 9 5 0 ( 2 x ) land pattern recommendation ( unit : mm ) 1 . 5 v?mw`r?y?b? w w w . g o f o t e c h . c o m
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