1/ 10 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 2 jan. 13 , 20 11 AX6648 1 00ma ultra - low quiescent current low dropout regulator ? general description the AX6648 is a cmos low dropout voltage (ldo) regulator with ultra-low quiescent current of 4 a , designed for battery-operated applications. wide range of output voltages can be used, ranging from 1.2v to 3.3v. other features include current limit protection, thermal shutdown protection and high output voltage accuracy. the requirement of only 1f for input and output capacitors makes it ideal in space-sensitive applications. the AX6648 is available in space saving 3-pin tsot- 23 -3l, 5-pin tsot- 23 -5l and 6-pin tdfn-6l packages. ? features - ultra - low quiescent current at 4 a - high output voltage accuracy at 2% - low dropout voltage of 450mv at 100ma - wide input operating voltage range fro m 2 to 5.5v - current limit protection - thermal shutdown protection - 1 f output capacitor required for stability - chip enable control (AX6648xxb t and AX6648xxz6 only) - rohs compliant - available in the t sot - 23- 3l , t sot - 23- 5l and tdfn - 6l package s ? block diagram current limit - + vin vout gnd error amp vref thermal shutdown power shutdown pmos rsen cf r1 r2 en v?mw`r?y?b? w w w . g o f o t e c h . c o m
2/ 10 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 2 jan. 13 , 20 11 AX6648 ? pin assignment the package s of AX6648 are t sot - 23- 3l, t sot - 23- 5l and tdfn - 6l; the pin assignment is given by : name description vin pow er input. gnd ground chip enable control input. pull the pin high to shut down ic; pull the pin low to enable ic. nc no connect vout output voltage ? order/marking information order information t op marking ( t sot - 23 - 3 l / t s ot - 23 - 5l) top marking ( tdfn - 6l) ( t o p v i e w ) t s o t - 2 3 - 3 l 2 3 1 v i n g n d v o u t ( t o p v i e w ) t s o t - 2 3 - 5 l 3 2 5 4 1 v i n g n d e n n c v o u t t d f n - 6 l ( 2 * 2 ) n c 1 2 3 4 5 6 g n d v i n ( t o p v i e w ) e n n c v o u t g n d en a x 6 6 4 8 x x x x x b t : t s o t - 2 3 - 5 l o u t p u t v o l t a g e p a c k a g e p a c k i n g b l a n k : b a g a : t a p i n g 1 5 : 1 . 5 v 1 8 : 1 . 8 v 3 3 : 3 . 3 v r t : t s o t - 2 3 - 3 l - 1 2 : 1 . 2 v 2 5 : 2 . 5 v 3 0 : 3 . 0 v z 6 : t d f n - 6 l l i d e n t i f i c a t i o n c o d e w w : 0 1 ~ 2 6 ( a ~ z ) 2 7 ~ 5 2 ( a ~ z ) y e a r : a = 2 0 1 0 1 = 2 0 1 1 i d c o d e : i n t e r n a l l y w x l y e a r : a = 2 0 1 0 1 = 2 0 1 1 w e e k : 0 1 ~ 2 6 ( a ~ z ) 2 7 ~ 5 2 ( a ~ z ) i d c o d e : i n t e r n a l l y w x i d e n t i f i c a t i o n c o d e v?mw`r?y?b? w w w . g o f o t e c h . c o m
3/ 10 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 2 jan. 13 , 20 11 AX6648 appendix part number identification code t sot - 23 - 3l /tdfn - 6l AX6648 - 1. 2 v aa AX6648 - 1.5v ab AX6648 - 1. 8 v ac AX6648 - 2.5v ad a x6648 - 3.0v ae AX6648 - 3.3v af ? absolute maximum ratings (at t a =25 c ) characteristics symbol rating unit input voltage v in + 2.0 to +5.5 v pin voltage v en v in + 0.3 v power dissipation pd ( t j - t a ) / ja mw storage temperature range t st - 65 to +150 c lead temperature (soldering, 10sec.) 260 c junction temperature t j +15 0 c operating temperature range - 40 to +85 c thermal resistance from junction to case t sot - 2 3 - 3 l jc 180 c/w tdfn - 6l 25 thermal resistance from junction to ambient t sot - 23 - 3l ja 250 c/w tdfn - 6l 120 note : ja is measured with the pcb copper area of approximately 1 in 2 (multi - layer). that need connect to gnd pin. ? e lectrical c haracteristics (v in = 5.5 v , v en = 0 v, c in = 1u f, t a =25 c , unless otherwise noted) characteristics symbol conditions min typ max units input voltage range v in 2 - 5.5 v output voltage accuracy v out i out =1ma - 2 - +2 % maximum output current l max v in =v out +0.6v, v in 3.6v 100 - - ma current limit i limit r load =1 150 - - ma quiescent current i q no load - 4 7 a dropout voltage v drop i out = 5 0ma - 200 300 mv i out = 10 0ma - 450 600 mv line regulation v line v in = (v out +0.3v) to 6v , v in 3.6v, i out =1ma - 0.2 - + 0.2 %/ v load regulation v load i out =0 to 1 00ma - 0.01 - %/ m a ripple rejection p srr freq.=1khz, c out = 1 f - 30 - db standby current l sd v en =v in - 0.1 - a threshold voltage 0.6 1 2 v temperature shutdown t s - 1 5 0 - oc temperature shutdown hysterisis t sh - 2 0 - oc en en en v v?mw`r?y?b? w w w . g o f o t e c h . c o m
4/ 10 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 2 jan. 13 , 20 11 AX6648 ? application circuit ? application information t he AX6648 is suitable for power saving battery application with ultra-low 4 a quiescent current. current limit and on chip thermal shutdown features provide protection against any combination of overload or ambient temperature that could exceed maximum junction temperature. shutdown control force pin low to enable the AX6648 and turn off the device by pulling it high. the pin can t be floated and must be tied to the ground if not used. thermal shutdown thermal shutdown is employed to protect the device damage from the junction temperature exceed safe margins due mainly to short circuit or current limit. moreover, the device returns normally operation when the junction temperature protection circuit is built in to protect ic, the maximum power dissipation design within tj (max) is needed. the thermal protection is independent to each channel. thermal considerations the power handling capability of the device will be limited by maximum 125c operation junction temperature. the power dissipated by the device will be estimated by p d =i out (v in -v out ). the power dissipation should be lower than the maximum power dissipation listed in absolute maximum ratings section. a x 6 6 4 8 v i n i n c v i n 1 u f e n c h i p e n a b l e g n d o u t v o u t c 1 u f v o u t en v?mw`r?y?b? w w w . g o f o t e c h . c o m
5/ 10 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 2 jan. 13 , 20 11 AX6648 capacitor selection the ceramic capacitor is ideal for AX6648 application. the esr of the output capacitor affects stability. larger value of the output capacitor decreases the peak deviations and improves transient response for larger current changes. the capacitor types (ceramic, aluminum, and tantalum) have different characterizations such as voltage and temperature coefficients. all ceramic capacitors are manufactured with a variety of dielectrics, each with different behavior across temperature and applications. common dielectrics used are x5r, x7r and y5v. it is recommended to use 1 f to 10 f x5r or x7r dielectric ceramic cap acitors because x5e or x7r hold their capacitance over wide voltage and temperature ranges than other y5v or z5u types. the esr of output capacitor is very important because it generates a zero to provide phase lead for loop stability. the input capacitor can reduced peak current and noise at power source. v?mw`r?y?b? w w w . g o f o t e c h . c o m
6/ 10 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 2 jan. 13 , 20 11 AX6648 ? typical characteristics v?mw`r?y?b? w w w . g o f o t e c h . c o m
7/ 10 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 2 jan. 13 , 20 11 AX6648 ? typical characteristics (continues) power on load transient load transient on en v?mw`r?y?b? w w w . g o f o t e c h . c o m
8/ 10 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 2 jan. 13 , 20 11 AX6648 ? package outlines (1) t sot - 23- 3 l symbol dimensions in millimeters dimensions in inches min. nom. max. min. nom. max. a 0.75 - 0.90 0.030 - 0.035 a1 0.00 - 0.10 0.000 - 0.004 a2 0.70 0.75 0.80 0.028 0.0 30 0.031 b 0.35 - 0.51 0.014 - 0.020 c 0.10 - 0.25 0.004 - 0.010 d 2.80 2.90 3.00 0.110 0.114 0.118 e 2.60 2.80 3.00 0.102 0.110 0.118 e1 1.50 1.60 1.70 0.059 0.063 0.067 e 0.95 bsc. 0.037 bsc. e1 1.90 bsc. 0.075 bsc. l 0.37 - - 0.015 - - l1 0.60 ref. 0.024 ref. l2 0.25 bsc. 0.010 bsc. y - - 0.10 - - 0.004 r 0.10 - - 0.004 - - 0 o - 8 o 0 o - 8 o 1 7 o nom. 7 o nom. 2 5 o nom. 5 o nom. e 1 e e e 1 b d a a 1 a 2 y 2 4 x 1 l 1 r l v?mw`r?y?b? w w w . g o f o t e c h . c o m
9/ 10 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 2 jan. 13 , 20 11 AX6648 (2) t s ot - 23- 5l symbol dimensions in millimeters dimensions in inches min. nom. max. min. nom. max. a - - 1.10 - - 0.043 a1 0.00 - 0.10 0 - 0.004 a2 0.70 0.90 1.00 0.028 0.035 0.039 b 0.30 0.40 0.50 0.012 0.016 0.020 c 0.08 0.14 0.20 0.003 0.006 0.008 d 2.80 2.90 3.00 0.110 0.114 0.118 e 2.60 2.80 3.00 0.102 0.110 0.118 e1 1.50 1.60 1.70 0.059 0.063 0.067 e 0.95 bsc. 0.037 bsc. e1 1.90 bsc. 0.075 bsc. l 0.30 0.45 0.60 0.012 0.018 0.024 l1 0.60 ref. 0.024 ref. l2 0.25 bsc. 0.010 bsc. y - - 0.10 - - 0.004 r 0.10 - - 0.004 - - 0 o - 8 o 0 o - 8 o jeced outline: mo-193 ab e 1 e e e 1 b d a a 1 a 2 y l 1 r l c l 2 v?mw`r?y?b? w w w . g o f o t e c h . c o m
10/ 10 axelite confidential materials, do not copy or distribute without written consent. rev. 1. 2 jan. 13 , 20 11 AX6648 (3) tdnf - 6l symbol dimensions i n millimeters dim ensions i n inches min. nom. max. min. nom. max. a 0.70 0.75 0.80 0.028 0.030 0.031 a1 0.00 0.02 0.05 0.000 0.001 0.002 a3 0.203 ref. 0.008 ref . b 0.2 0 0.2 8 0.3 5 0.009 0.011 0.013 d 1.95 2.00 2.05 0.077 0.079 0.081 d2 1. 35 1.5 0 1.6 5 0.055 0.059 0.06 3 e 1.95 2.00 2.05 0.07 7 0.079 0.081 e2 0. 75 0.9 0 1.0 5 0.031 0.035 0.039 e 0.65 bsc. 0.026 bsc. l 0.20 0.3 0 0.4 0 0.008 0.012 0.016 e d a a 1 a 3 d 2 e e 2 ( top view ) ( bottom view ) b pin 1 l seating plane ( side view ) v?mw`r?y?b? w w w . g o f o t e c h . c o m
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