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1/ 14 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 1 jul. 30 , 20 10 ax66 42 /a 1.5 a high output current ldo regulator ? general description the ax6642/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 1.5a. 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 50 a . due to internal flexible design; result in extensively fixed output voltage versions form 1.2v to 5v per 0.1v steps. built-in current-limit, short current protection and thermal-shutdown functions prevent any fault condition from ic damage. ? f eatures - input voltage range : 2.6 v~ 5.5 v - dropout voltage is 450 mv at 1 .5 a output current @ v out = 3.30v - guaranteed 1. 5 a output current - low quiescent current is 5 0a (typ.) - fixed output voltage is form 1.2 v to 5v by 0.1v steps. - fast transient response - curr ent limit and thermal shutdown protection - short circuit current fold - back - available in the 3 - pin pb - free sot89, sot - 223 , to263, to252 and sop- 8l p ackage s ? b lock d iagram current limit - + vin vout gnd err or amp ban dgap t hermal shutdown ena ble en bp v?mw`r?y?b? www.gofotech.com
2/ 14 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 1 jul. 30 , 20 10 ax66 42 /a ? pin assignment the package s of ax6642/a are sot89 - 3l, s ot2 2 3 - 3 l , to252 - 3l , to263 - 2 l and sop - 8l; the pin assignment is given by : name description vin voltage input gnd ground vout output voltage en active - low shutdown input. a logic low reduces t he supply current to less than 2 a. connect to v in or floating for normal operation. (sop - 8l only) bp band - gap ( sop - 8l only) vin gnd vout tab is gnd ( top view ) 3 2 1 tab is vout ax 6642 ax 6642 a ( top view ) 3 2 1 vin gnd vout sot 223 - 3 l sot 89 - 3 l 3 2 1 vin vout gnd tab is vout ( top view ) ax 6642 a 3 2 1 vin vout gnd tab is gnd ( top view ) ax 6642 to 252 - 3 l 3 2 1 vin vout gnd tab is gnd top view ax 6642 3 2 1 vin vout gnd tab is vout top view ax 6642 a to 263 - 2 l ( top view ) 1 2 3 4 8 7 6 5 vout bp sop - 8 l ax 6642 en vin gnd gnd gnd gnd v?mw`r?y?b? www.gofotech.com
3/ 14 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 1 jul. 30 , 20 10 ax66 42 /a ? order/marking information order information top marking (sot223 - 3l) top marking (sot89 - 3l) output type : top marking (to252 - 3l/to263 - 2l) top marking (sop - 8l) ax 6642 xxx x x e : sot 223 - 3 l d : to 252 - 3 l m : to 263 - 2 l f : sot 89 - 3 l s : sop - 8 l output voltage package packing blank : tube a : taping 100 : 1 . 0 v 110 : 1 . 1 v 500 : 5 . 0 v x - refer pin assignment pin define 6 y ax id code : internal ww : 01 ~ 52 year : a = 2010 1 = 2011 6 2 4 w w x v v output voltage - blank : ax 6642 a : ax 6642 a a ax 6642 - 10 : 1 . 0 v ax 6642 - 11 : 1 . 1 v ax 6642 - 50 : 5 . 0 v 6 x year : a = 2010 1 = 2011 y w l output type 6 4 2 ww : 01 ~ 26 ( a ~ z ) 27 ~ 52 ( a ~ z ) x functional code id code : internal blank : ax 6642 a : ax 6642 a a : 1 . 2 v b : 1 . 3 v c : 1 . 4 v d : 1 . 5 v e : 1 . 6 v f : 1 . 7 v g : 1 . 8 v h : 1 . 9 v j : 2 . 0 v k : 2 . 1 v l : 2 . 2 v m : 2 . 3 v n : 2 . 4 v p : 2 . 5 v q : 2 . 6 v r : 2 . 7 v s : 2 . 8 v t : 2 . 9 v u : 3 . 0 v v : 3 . 1 v w : 3 . 2 v x : 3 . 3 v y : 3 . 4 v z : 3 . 5 v a : 3 . 6 v b : 3 . 7 v d : 3 . 8 v e : 3 . 9 v f : 4 . 0 v g : 4 . 1 v h : 4 . 2 v m : 4 . 3 v n : 4 . 4 v o : 4 . 5 v q : 4 . 6 v r : 4 . 7 v t : 4 . 8 v u : 4 . 9 v y : 5 . 0 v 6 y ax id code : internal ww : 01 ~ 52 year : 10 = 2010 11 = 2011 6 2 4 w w x v v output voltage - blank : ax 6642 a : ax 6642 a a ax 6642 - 10 : 1 . 0 v ax 6642 - 11 : 1 . 1 v ax 6642 - 50 : 5 . 0 v logo 6 y ax part number id code : internal ww : 01 ~ 52 year : 10 = 2010 11 = 2011 output voltage - 5 0 6 4 2 y w w x a blank : ax 6642 a : ax 6642 a v?mw`r?y?b? www.gofotech.com
4/ 14 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 1 jul. 30 , 20 10 ax66 42 /a ? absolute maximum ratings (at t a =25 oc ) characteristics symbol rating unit v in pin voltage v in gnd - 0.3 to gnd + 6 .5 v output voltage v out gnd - 0.3 to v in + 0.3 v en and bp v en , v bp gnd - 0.3 to v in +0.3 v power dissipation pd sot89=0.6, sot223= 1.3 to263=4,to252=2.2 ,sop - 8=1.4 w storage temperature range t st - 40 to +150 oc operating temperature range t op - 40 to +85 oc junction temperature t j - 40 to +125 oc thermal resistance from junction to case sot22 3 jc 15 oc /w to263 3.5 to252 10 sot89 100 sop - 8 25 thermal resistance from junction to ambient sot223 ja 75 oc /w to263 25 to252 45 sot89 160 sop - 8 70 note: e ja is measured with the pcb copper area of approximately 1 in 2 (multi- layer). that need connect to tap pin. ? electrical characteristics t a =25 oc (unless otherwise noted) characteristics symbol conditions min typ max units input voltage v in i out =30ma 2.6 - 5.5 v output voltage accuracy (note 1 ) v out v in =v out +0.1v to 5.5 v v out R 2.5 v, i out =1ma - 2 - + 2 % v in =2.6v to 5.5 v 2.5v v out R 1.20v, i out =1ma - 3 - + 3 quiescent current i q i out =0ma, v in =5v - 5 0 80 a shutdown current i sd i out =0ma, v en =0v - - 2 a dropout voltage v drop i out = 1. 5 a v out =1.20v - 1.3 1. 7 v v out =1.50 v - 1. 0 1. 4 v out =1.80v - 0. 7 1. 1 v out =2.50v - 0.5 5 0. 75 v out =3.30v - 0. 45 0. 65 current limit (note 2 ) i limit 1. 6 2.0 - a short circuit current i short output voltage < 0. 2 5*v out - 6 00 - ma load regulation (note 3 ) v load i out =10m ~1. 5 a 2 .0v v out - 10 20 mv 2.0v Q v out - 0.5 1 % ripple rejection psrr c in =2.2f, c o =2.2uf, i out =10ma f=120hz - 65 - db f=1khz - 6 0 - enable input threshold v enh regulator enable 2.0 - - v v?mw`r?y?b? www.gofotech.com
5/ 14 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 1 jul. 30 , 20 10 ax66 42 /a (sop - 8l only) v enl regulator shutdown - - 0. 6 enable pin cur rent (sop - 8l only) i e n h v en =v in - 0.003 0.1 a i e n l v en =0v - 1 1 .5 temperature shutdown t s - 1 50 - oc temperature shutdown hysterisis t sh - 30 - oc note 1 : minimum v in voltage is defined by output adds a dropout voltage. note 2 : current limit is meas ured at constant junction temperature by using pulsed testing with a low on time. note 3 : regulation is measured at constant junction temperature by using pulsed testing with a low on time. ? a pplication c ircuit 1. for sot223 - 3l/sot89 - 3l/to252 - 3l/to263 - 2l packa ges 2. for sop - 8l package ? f unction d escriptions a minimum of 2.2f 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. vin vout gnd in c v in out c ax 6642 / a 2 . 2 uf 2 . 2 uf out v vin vout gnd in c v in out c ax 6642 2 . 2 uf 2 . 2 uf out v 10 nf en bp v?mw`r?y?b? www.gofotech.com
6/ 14 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 1 jul. 30 , 20 10 ax66 42 /a ? a pplication i nformati on like any low-dropout regulator, the ax6642/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. 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 2.2f capacitor on the input and a 2.2f capacitor on the output of the ax6642/a. larger input capacitor values and lower esr (x5r, x7r) provide better supply-noise rejection and transient response. a higher- value output capacitor (4.7f) 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 useful 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 ax6642/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, ax6642/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. thermal considerations the ax6642/a series can deliver a current of up to 1. 5a 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: v?mw`r?y?b? www.gofotech.com
7/ 14 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 1 jul. 30 , 20 10 ax66 42 /a pd (max) = (t j (max) - t a ) / ja where t j (max) is the maximum junction temperature of the die (125c) 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 (please refer maximum rating table) that is connected 1 in 2 pcb copper area to tap pin. pcb layout an input capacitance of ? 2. 2f is required between the ax6642/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
8/ 14 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 1 jul. 30 , 20 10 ax66 42 /a ? t ypical c haracteristics v in vs.i ccq 20 30 40 50 60 70 80 2.6 3 3.5 4 4.5 5 5.5 v in (v) i ccq (ua) i out =0ma v in vs. i sd 0 0.2 0.4 0.6 0.8 1 1.2 1.4 2.6 3 3.5 4 4.5 5 5.5 v in (v) i sd (ua) v en =0v v in vs. i cl 0 1 2 3 4 5 2.6 3 3.5 4 4.5 5 5.5 v in (v) i cl (a) v out =1.2v v in vs. threshold voltage 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.6 3 3.5 4 4.5 5 5.5 v in (v) v enh /v enl (v) v enh v enl temperature vs. i ccq 0 10 20 30 40 50 60 70 80 90 100 -40 : -20 : 0 : 25 : 50 : 85 : 105 : 125 : temperature i ccq (ua) v in =5v load regulation 1.14 1.16 1.18 1.2 1.22 1.24 1.26 0 0.01 0.1 0.3 0.5 0.8 1 1.2 1.5 i out (a) v out (v) v in =3.3v v?mw`r?y?b? www.gofotech.com
9/ 14 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 1 jul. 30 , 20 10 ax66 42 /a ? typical characteristics (continuous) power - on en - on (sop - 8l only) load t ransient thermal shutdown release i out vs. dropout voltage 0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 0.1 0.3 0.5 0.8 1 1.2 1.5 i out (a) dropout voltage (mv) v out =1.2 v out =1.5 v out =1.8 v out =2.5 v out =3.3 v out =5.0 v?mw`r?y?b? www.gofotech.com
10/ 14 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 1 jul. 30 , 20 10 ax66 42 /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 0.3 15 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
11/ 14 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 1 jul. 30 , 20 10 ax66 42 /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 5.46 0.195 0.2 05 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 0.382 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
12/ 14 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 1 jul. 30 , 20 10 ax66 42 /a (3) to263 - 2 l symbol dimensions in millimeters dimensions in inc hes 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
13 /14 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 1 jul. 30 , 20 10 ax66 42 /a (4) s ot89 - 3l symbol dimensions in millimeters dimensions in inches min. nom. max. min. nom. max. a 1.40 1.50 1.60 0.055 0.059 0.063 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 0.01 4 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? www.gofotech.com
14/ 14 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 1 jul. 30 , 20 10 ax66 42 /a ( 5 ) so p 8 - 8 l symbol dimensions in millimeters dimensions in inches min. nom. max. min. nom. max. a - - 1.75 - - 0.069 a1 0.1 - 0.25 0.04 - 0.1 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 0 o - 8 o 0 o - 8 o mold flash shall not exceed 0.25mm per side j edec outline: ms-012 aa detail a l h e a a 2 a 1 e d 7 ( 4 x ) b y c detail a v?mw`r?y?b? www.gofotech.com

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