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1/ 17 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 5 jul.27, 2010 ax6639 /a 3a high output current ldo regulator ? general description the ax6639 /a is a low noise, high output current, low quiescent current and low dropout linear regulator. the device includes pass element, error amplifier, band-gap, current-limit and thermal shutdown circuitry. the output current is up to 3a . the characteristics of low dropout voltage and less quiescent current make it good for some critical current application, for example, some battery powered devices. the typical quiescent current is approximately 20 0 a . there are 1.5v, 1.8v, 2.5v, 3.3v fixed output voltage and adjustable output versions (sop- 8l - ep and to263- 5l only). built-in current-limit, short current protection and thermal-shutdown functions prevent any fault condition from ic damage. ? feat ures - input voltage range : 2.6 v~ 5.5 v - adjustable output ( sop - 8l- ep and to263 - 5l only ) and f ixed output voltage for 1.5v, 1.8v, 2.5v and 3.3v - dropout voltage is 3 8 0mv at 3 a output current - guaranteed 3a output current - low quiescent current is 20 0a (typ.) - fast transient response - current limit and thermal shutdown protection - short circuit current fold - back - available in the 3 - pin to220 , sot - 223 , to252, 2-pin to263 and 5-pin to263 and sop - 8l- ep pb - free p ackage s v?mw`r?y?b? www.gofotech.com
2/ 17 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 5 jul.27, 20 10 ax66 3 9 /a ? b lock diagram current limit - + vin vout gnd error amp bandgap thermal shutdown enable en fixed version current limit - + vin vout gnd error amp bandgap thermal shutdown enable en fb adjustable version v?mw`r?y?b? www.gofotech.com
3/ 17 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 5 jul.27, 20 10 ax66 3 9 /a ? pin assignment the package s of ax6639 /a are to220 - 3l, sot2 2 3 - 3 l , sop - 8l- ep, to252 - 3l, to263 - 2 l , to263 - 5l; the pin assignment is given by : name description vin voltage input gnd ground vout output voltage en enable pin input fb feedback pin nc no connect pin vin gnd vout tab is gnd ( top view ) 3 2 1 tab is vout ax 6639 ax 6639 a ( top view ) 3 2 1 vin gnd vout sot 223 - 3 l tab is gnd 3 vin 2 1 vout gnd ( top view ) ax 6639 tab is vout 3 vin 2 1 vout gnd ( top view ) ax 6639 a to 220 - 3 l 3 2 1 vin vout gnd tab is vout ( top view ) ax 6639 a 3 2 1 vin vout gnd tab is gnd ( top view ) ax 6639 to 252 - 3 l 3 2 1 vin vout gnd tab is gnd top view ax 6639 3 2 1 vin vout gnd tab is vout top view ax 6639 a to 263 - 2 l ax 6639 to 263 - 5 l ( top view ) 3 gnd 1 en 2 vin 5 fb 4 vout metal tab gnd ( top view ) 1 2 3 4 8 7 6 5 nc vin sop C C v?mw`r?y?b? www.gofotech.com
4/ 17 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 5 jul.27, 20 10 ax66 3 9 /a ? order/ marking information order information (fixed version) order information (adj version) top marking (fixed version) to220 - 3l/to252 - 3l/to263 - 2l/to263 - 5l top marking (fixed version) sot223 - 3l top marking (adj version) sop - 8l - ep ax 6639 xxx xx x e : sot 223 - 3 l d : to 252 - 3 l t : to 220 - 3 l m : to 263 - 2 l output voltage package packing blank : tube a : taping 150 : 1 . 5 v 180 : 1 . 8 v 250 : 2 . 5 v 330 : 3 . 3 v x - refer pin assignment pin define ax 6639 xx x es : sop - 8 l - ep package packing blank : tube a : taping m 5 : to 263 - 5 l 6 y ax id code : internal ww : 01 ~ 52 year : 10 = 2010 11 = 2011 6 9 3 w w x v v output voltage - blank : ax 6639 a : ax 6639 a a 15 : 1 . 5 v 18 : 1 . 8 v 33 : 3 . 3 v y 25 : 2 . 5 v 6 y ax id code : internal ww : 01 ~ 52 year : a = 2010 1 = 2011 6 9 3 w w x v v output voltage - blank : ax 6639 a : ax 6639 a a 15 : 1 . 5 v 18 : 1 . 8 v 33 : 3 . 3 v 25 : 2 . 5 v logo y ax 6 part number id code : internal ww : 01 ~ 52 year : 10 = 2010 11 = 2011 6 3 9 y w w x v?mw`r?y?b? www.gofotech.com
5/ 17 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 5 jul.27, 20 10 ax66 3 9 /a ? abolute maximum rating (at t a =25 c ) characteristics symbol rating unit v in pin voltage v in gnd - 0.3 to 6 v o utput voltage v out gnd - 0.3 to v in + 0.3 v en pin voltage v en gnd - 0.3 to 6 v fb pin voltage v fb gnd - 0.3 to 6 v power dissipation pd internally limited w storage temperature range t st - 40 to +150 c operating temperature range t op - 4 0 to + 8 5 c j unction temperature t j - 4 0 to +125 c thermal resistance from junction to case sot223 jc 15 c /w sop8l 15 to263 3.5 to252 10 to220 3.5 thermal resistance from junction to ambient sot223 ja 75 c /w sop8l 40 to263 25 to252 45 to220 25 note : ja is measured with the pcb copper area of approximately 1 in 2 (multi - layer). that need connect to tap or exposed pad (sop - 8l- ep only) pin. ? e lectrical c haracteristics v in = 5v, t a = 25c (unless otherwise noted) characteristics symbol conditions min typ max units input voltage v in i out =30ma (note1) 2.6 - 5.5 v output voltage accuracy v out i out =1ma (note1) - 2 - + 2 % feedback voltage ( sop - 8l - ep and to263 - 5l only) v fb i out = 1ma 0.784 0.8 0.816 v fb input leakage current ( sop - 8l - ep an d to263 - 5l only) i fb v fb = 0.8 v - 100 - 100 na quiescent current i q i out =0ma, v in =5v - 200 300 a shutdown current i stb for to263 - 5l and sop - 8l only - 2 5 ua dropout voltage v drop i out = 3 a v out =1.50v - 1.2 0 1. 5 v v out =1.80v - 0. 9 1. 2 v out =2.50v - 0.57 0.7 v out =3.30v - 0.38 0.6 v?mw`r?y?b? www.gofotech.com
6/ 17 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 5 jul.27, 20 10 ax66 3 9 /a current limit (note 2) i limit 3.3 4.0 - a short circuit current i short output voltage < 0. 25 *v out - 1.0 - a load regulation (note 3) v load i out =10m~3a - 15 30 mv enable input threshold v enh regulator enable 2.0 - - v v enl regulator shutdown - - 0.6 enable pin current i enh v en =v in - 0.003 0.1 a i enl v en =0v - 2 4 ripple rejection psrr c in = 10uf , c o = 10uf , i out =10ma f=120hz - 65 - db f=1khz - 55 - temperature shutdown ts - 140 - oc temperature shutdown hysterisis tsh - 30 - oc note1. minimum v in voltage is defined by output adds a dropout voltage. note 2 . current limit is measured at constant junction temperature by using pulsed testing with a low on time. note 3 . regulation is measured at constant jun ction temperature by using pulsed testing with a low on time. ? a pplication c ircuit vin vout gnd c in v in c out ax 6639 / a 10 uf 10 uf v out v?mw`r?y?b? www.gofotech.com
7/ 17 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 5 jul.27, 20 10 ax66 3 9 /a v ovt = v fb (1 +r1/ r2) v fb = 0.8v r2 range = 50k ~ 300k ? f unction d es criptions a minimum of 10 f capacitor must be connected from v out to ground to insure stability. typically a large storage capacitor is connected from v in to ground to ensure that the input voltage does not sag below the minimum dropout voltage during the load transient response. this pin must always be dropout voltage higher than v out in order for the device to regulate properly. enable function the ax6639 /a (to263 - 5l and sop - 8l- ep only) features an ldo regulator enable/disable function. to assure the l do regulator will switch on; the en turn on contr ol level must be greater than 2.0 volts. the ldo regulator will go into the shutdown mode when the voltage on the en pin falls below 0. 6 volts. if the enable function is not needed in a specific application, it can be floating. vin vout gnd c in v in c out ax 6639 - to 263 - 5 l 10 uf 10 uf v out en on off 2 1 3 4 fb r 1 r 2 5 vin vout gnd c in v in ax 6639 - sop - 8 l - ep 10 uf v out fb en on off 3 2 nc 1 , 4 , 5 7 6 r 1 r 2 8 c out 10 uf v?mw`r?y?b? www.gofotech.com
8/ 17 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 5 jul.27, 20 10 ax66 3 9 /a fb function (sop - 8l - ep and to263 - 5l only) the output is an adjustable version, the fb voltage is 0.8v. the output voltage can be set by outside resistances. the output voltage, v out, is then given by the following equation: v out = 0.8* (1 + r1/r2) for the reasons of reducing power dissipation and loop stability, r2 is recommending to choose 50 k~3 00k . ? a pplication i nformation like any low-dropout regulator, the ax6639 /a requires input and output decoupling capacitors. the device is specifically designed for portable applications requiring minimum board space and smallest components. these capacitors must be correctly selected for good performance (see capacitor characteristics section). please note that linear regulators with a low dropout voltage have high internal loop gains which require care in guarding against oscillation caused by insufficient decoupling capacitance. capacitor selection normally, use a 10 f capacitor on the input and a 10 f capacitor on t he output of the ax6639 /a . larger input capacitor values and lower esr (x5r, x7r) provide better supply-noise rejection and transient response. a higher- value output capacitor may be necessary if large, fast transients are anticipated and the device is located several inches from the power source. input-output (dropout) voltage a regulator's minimum input- to -output voltage differential (dropout voltage) determines the lowest usable supply voltage. in battery-powered systems, this determines the usefu l end- of -life battery voltage. because the device uses a pmos, its dropout voltage is a function of drain-to source on -resistance, r ds (on) , multiplied by the load current: v dropout = v in -v out = r ds (on) x i out current limit an d short-circuit protection the ax6639 /a used a current sense-resistor to monitor the output current. a portion of the pmos output transistors current is mirrored to a resistor such that the voltage across this resistor is proportional to the output current. once the output current exceeds limit threshold, ax6639 /a would be protected with a limited output current. further more, when the output is short to ground, the output current would be folded-back to a less limit. v?mw`r?y?b? www.gofotech.com
9/ 17 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 5 jul.27, 20 10 ax66 3 9 /a thermal considerations the ax6639 /a series can deliver a current of up to 3a over the full operating junction temperature range. however, the maximum output current must be dated at higher ambient temperature to ensure the junction temperature does not exceed 125c. with all possible conditions, the junction temperature must be within the range specified under operating conditions. power dissipation can be calculated based on the output current and the voltage drop across regulator. pd = (v in - v out ) i out the final operating junction temperature for any set of conditions can be estimated by the following thermal equation: pd (max) = (t j (max) - t a ) / ja where t j (max) is the maximum junction temperature of the die (125 c) and t a is the maximum ambient temperature. the junction to ambient thermal resistance ( ja ) for sot223- 3l package at recommended minimum footprint is 75 c/w that is connect 1 in 2 pcb copper area to tap pin. pcb layout an input capacitance of ? 10 f is required between the ax6639 /a input pin and ground (the amount of the capacitance may be increased without limit), this capacitor must be located a distance of not more than 1cm from the input and return to a clean analog ground. input capacitor can filter out the input voltage spike caused by the surge current due to the inductive effect of the package pin and the printed circuit boards routing wire. otherwise, the actual voltage at the vin pin may exceed the absolute maximum rating. the output capacitor also must be located a distance of not more than 1cm from output to a clean analog ground. because it can filter out the output spike caused by the surge current due to the inductive effect of the package pin and the printed circuit board s routing wire. v?mw`r?y?b? www.gofotech.com
10/ 17 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 5 jul.27, 20 10 ax66 3 9 /a ? t ypical c haract eristics 1.780 1.785 1.790 1.795 1.800 1.805 1.810 1.815 1.820 3 3.5 4 4.5 5 5.5 6 vin vs vout vin (v) vout (v) iout=10ma ax6639-1.8v 3.270 3.275 3.280 3.285 3.290 3.295 3.300 3.305 3.310 3.315 3.320 3.325 3.330 3.5 4 4.5 5 5.5 6 vin vs vout vin (v) vout (v) iout=10ma ax6639-3.3v 1.720 1.740 1.760 1.780 1.800 1.820 1.840 1.860 1.880 0 0.5 1 1.5 2 2.5 3 iout vs vout iout (a) vout (v) vin=3.0v ax6639-1.8v 3.200 3.220 3.240 3.260 3.280 3.300 3.320 3.340 3.360 3.380 3.400 0 0.5 1 1.5 2 2.5 3 iout vs vout iout (a) vout (v) vin=4.0v ax6639-3.3v 0 50 100 150 200 250 300 2.5 3 3.5 4 4.5 5 5.5 6 vin vs iccq vin (v) iccq (ua) iout=0a 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0 0.5 1 1.5 2 2.5 3 iout vs dropout voltage iout (a) dropout voltage(v) ax6639-1.5v ax6639-1.8v ax6639-2.5v ax6639-3.3v v?mw`r?y?b? www.gofotech.com
11/ 17 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 5 jul.27, 20 10 ax66 3 9 /a ? t ypical c haracteristics (c ontinuous ) load transient power - on (v in =5v, v out =3.3v , i out =2 a) 1.70 1.72 1.74 1.76 1.78 1.80 1.82 1.84 1.86 1.88 1.90 -40 -20 0 25 50 85 105 125 temperaute vs vout temperature( ) vout (v) vin=4v iout=10ma ax6639-1.8v 3.20 3.22 3.24 3.26 3.28 3.30 3.32 3.34 3.36 3.38 3.40 -40 -20 0 25 50 85 105 125 temperaute vs vout temperature( ) vout (v) vin=4v iout=10ma ax6639-3.3v c 0 50 100 150 200 250 300 350 400 -40 -20 0 25 50 85 105 125 temperaute vs iccq temperature( ) iccq(ua) vin=5v iout=0a v?mw`r?y?b? www.gofotech.com
12/ 17 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 5 jul.27, 20 10 ax66 3 9 /a ? p ackage o utlines (1) sot223 - 3l symbol dimensions in millimeters dimensions in inches min. nom. max. min. nom. max. a - - 1.8 - - 0.071 a1 0.02 0.06 0.1 0.001 0.002 0.004 b 0.66 0.75 0.84 0.026 0.03 0.033 b1 2.9 3 3.1 0.114 0.118 0 .122 c 0.23 0.315 0.35 0.009 0.012 0.014 d 6.3 6.5 6.7 0.248 0.256 0.264 e 3.3 3.5 3.7 0.13 0.138 0.146 h 6.7 7 7.3 0.264 0.278 0.287 l 0.75 - - 0.03 - - k 1.5 1.75 2 0.059 0.069 0.079 e 2.3 basic 0.091 basic e1 4.6 basic 0.181 basic jedec outline: to-261 ab h e k d b 1 e e 1 b c l a 1 seating plane 3 . 3 1 . 9 6 . 4 2 . 3 1 . 2 1 . 6 land pattern recommendation ( unit : mm ) a v?mw`r?y?b? www.gofotech.com
13/ 17 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 5 jul.27, 20 10 ax66 3 9 /a (2) to252 - 3l symbol dimensions in millimeters dimensions in inches min. nom. max. min. nom. max. a 2.18 2.29 2.39 0.086 0.09 0.094 a1 - - 0.13 - - 0.005 b 0.51 0.71 0.89 0.02 0.028 0.035 b2 4.95 5.21 5.4 6 0.195 0.205 0.215 c 0.46 0.53 0.61 0.018 0.021 0.024 c1 0.46 0.53 0.58 0.018 0.021 0.023 d 5.33 5.46 5.59 0.21 0.215 0.22 d1 4.57 - - 0.18 - - e 6.35 6.55 6.73 0.25 0.258 0.265 e 2.29 bsc 0.090 bsc. e1 4.58 bsc 0.180 bsc. h 9.4 9.7 10.4 0.37 0.38 2 0.41 l 1.4 1.6 1.78 0.055 0.063 0.07 l1 - - 1.02 - - 0.04 l2 1.52 1.78 2.03 0.06 0.07 0.08 mold flash shall not exceed 0.005inch per side jedec outline: to-252 ab b 2 e e b l 2 e 1 d l 1 h a c 1 c a 1 seating plane l 5 . 6 1 1 . 0 5 . 6 2 . 0 2 . 25 land pattern recommendation ( unit : mm ) 7 . 2 1 . 2 d 1 v?mw`r?y?b? www.gofotech.com
14/ 17 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 5 jul.27, 20 10 ax66 3 9 /a (3) to2 6 3 - 2l symbol dimensions in millimeters dimensions in inches min. nom. max. min. nom. max. a 4.06 4.45 4.83 0.16 0.175 0.19 b 0.51 0.76 0.99 0.02 0.03 0.039 b2 1.14 1.47 1.78 0.045 0.058 0.07 c 0.38 0.56 0.74 0.015 0.022 0.029 c2 1.14 1.4 1.65 0.045 0.055 0.065 d 8.38 9.02 9.65 0.33 0.355 0.38 d1 5.08 - - 0.2 - - e 9,65 10.2 10.7 0.38 0.4 0.42 e 2.54 bsc 0.1 bsc l 14.6 15.2 15.9 0.575 0.6 0.625 l1 1.78 2.29 2.79 0.07 0.09 0.11 l2 - - 1.68 - - 0.066 l3 - - 1.78 - - 0.07 mold flash shall not exceed 0.005inch per side jedec outline: to-263 ab e e l 2 b b 2 d l 3 l a c 2 c l 1 1 . 3 3 1 5 . 7 10 . 9 9 . 1 land pattern recommendation ( unit : mm ) 2 . 54 d 1 v?mw`r?y?b? www.gofotech.com
15/ 17 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 5 jul.27, 20 10 ax66 3 9 /a (4) to263 - 5l symbol dimensions in millimeters dimensions in inches min. nom. max. min. nom. max. a 4.06 4.45 4.83 0.16 0.175 0.19 b 0.51 0.76 0.99 0.02 0.03 0.039 c 0.38 0.56 0.74 0.015 0.022 0.029 c2 1.14 1.4 1.65 0.045 0.055 0.065 d 8.38 9.02 9.65 0.33 0.355 0.38 e 9,65 10.2 10.7 0.38 0.4 0.42 e 1.70 bsc 0.067 bsc l 14.6 15.2 15.9 0.575 0.6 0.625 l1 1.78 2.29 2.79 0.07 0.09 0.11 l2 - - 1.68 - - 0.066 mold flash shall not exceed 0.005inch per side jedec outline: to-263 ba e l 2 e b d l a c 2 c l 1 land pattern recommendation ( unit : mm ) 1 . 0 3 . 0 1 5 . 8 10 . 9 9 . 2 1 . 71 v?mw`r?y?b? www.gofotech.com
16/ 17 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 5 jul.27, 20 10 ax66 3 9 /a (5) to220 - 3l symbol dimensions in millimeters dimensions in inches min. nom. max. min. nom. max. a 3.55 4.19 4.83 0.14 0.165 0.19 b1 1.14 1.45 1.78 0.045 0.057 0.07 b 0.38 0.69 1.02 0.015 0.027 0.04 c 0.36 0.4 8 0.61 0.014 0.019 0.024 d 14.2 15.4 16.5 0.56 0.605 0.65 e 9.7 10.2 10.7 0.38 0.4 0.42 e 2.54bsc 0.1bsc e1 5.08bsc 0.2bsc f 0.51 0.95 1.397 0.02 0.038 0.055 h1 5.84 6.35 6.86 0.23 0.25 0.27 j1 2.03 2.48 2.92 0.08 0.098 0.115 l 12.7 13.7 14.73 0.5 0.54 0.58 l1 6.35 0.25 p 3.53 3.81 4.09 0.139 0.15 0.161 q 2.54 2.98 3.43 0.1 0.118 0.135 mold flash shall not exceed 0.005inch per side jedec outline: to-220 ab a j 1 f c s e a t i n g p l a n e d q e l 1 l b e e 1 b 1 h 1 a j 1 f c s e a t i n g p l a n e d q e l 1 l b e e 1 b 1 h 1 p p v?mw`r?y?b? www.gofotech.com
17/ 17 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 5 jul.27, 20 10 ax66 3 9 /a (6) sop - 8l - ep symbol dimensions in millimeters dime nsions in inches min. nom. max. min. nom. max. a - - 1.75 - - 0.069 a1 0 - 0.15 0 - 0.06 a2 1.25 - - 0.049 - - c 0.1 0.2 0.25 0.0075 0.008 0.01 d 4.7 4.9 5.1 0.185 0.193 0.2 e 3.7 3.9 4.1 0.146 0.154 0.161 h 5.8 6 6.2 0.228 0.236 0.244 l 0.4 - 1. 27 0.015 - 0.05 b 0.31 0.41 0.51 0.012 0.016 0.02 e 1.27 bsc 0.050 bsc y - - 0.1 - - 0.004 x - 2.34 - - 0.092 - y - 2.34 - - 0.092 - 0 o - 8 o 0 o - 8 o mold flash shall not exceed 0.25mm per side jedec outline: ms-012 ba detail a l h e a a 2 a 1 e d 7 ( 4 x ) b y c detail a y x expose pad p v?mw`r?y?b? www.gofotech.com

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