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________________________________________________________________________ http://www.union - ic.com rev.0 5 mar .20 1 4 1 / 13 u m 4 7 5 0 300 ma, micropower , dual channel vldo linear regulator um 4 75 0 s - xx sot23 - 6 um4750 da - xx dfn6 2.0 2.0 um4750db - xx dfn8 3.0 3.0 general description the um475 0 series are dual channel vldo (very low dropout) linear regulator s designed for low power portable applications. the range of output voltage is from 1.2v to 5.0v while operated from 2.5v to 5.5v input. typical output noise is only 2 00 v rms and maximum dropout is just 2 0 0 mv at the load current of 1 0 0ma. the um475 0 series offer high output voltage accuracy, excellent transient response, stab i lity with ultra low esr ceramic capacitors as small as 1 f, thermal overload protection and outp ut current limiting. the um475 0 s - xx series are av ailable in a low profile sot23 - 6 package , the um475 0 da - xx series are available in a low profile dfn 6 2 .0 2 .0 package , and um4750db - xx series are available in a low profile dfn8 3 .0 3 .0 package. application s features ? bluetooth/802.11 cards ? pdas and notebook computers ? portable instruments and battery - powered systems ? cellular phones ? very low dropout: 2 00 mv (max) at 1 0 0ma ? maximum input voltage : 5.5 v ? low noise: 2 00 v rms (10hz to 100khz) ? fast transient response ? dual ldo output s (300ma/300ma) ? output current limit ? stable with 1 f output capacitor ? thermal overload protection ? low profile sot23 - 6 , 6 - l ead dfn 2 .0 2 .0 and 8 - lead dfn 3 .0 3 .0 package s pin configurations top view m: month code um475 0 s - xx sot23 - 6 v o u t 1 v o u t 2 v i n g n d e n 1 e n 2 7 x x m 1 2 3 4 5 6
________________________________________________________________________ http://www.union - ic.com rev.0 5 mar .20 1 4 2 / 13 u m 4 7 5 0 pin description naming information m: month code um475 0 da - xx dfn6 2 .0 2 .0 m: month code um4750db - xx dfn 8 3 .0 3 .0 pin number symbol function um4750s - xx um4750da - xx um4750db - xx 1 5 5 vout2 channel2 output voltage 2 2 6 gnd ground 3 4 3 en2 enable2 input, active high 4 3 2 en1 enable1 input, active high 5 1 1 vin power supply 6 6 8 vout1 channel1 output voltage - - 4,7 nc no connection u m 4 7 5 0 c h a n n e l 1 o u t p u t v o l t a g e p a c k a g e t y p e s : s o t 2 3 - 6 d a : d f n 6 2 . 0 2 . 0 d b : d f n 8 3 . 0 3 . 0 - c h a n n e l 2 o u t p u t v o l t a g e 1 v i n g n d e n 1 e n 2 v o u t 2 v o u t 1 2 3 4 5 6 7 x x m m a r k i n g p i n 1 1 2 3 4 8 7 6 5 g n d v i n e n 2 e n 1 n c v o u t 1 n c g n d v o u t 2 7 x x m
________________________________________________________________________ http://www.union - ic.com rev.0 5 mar .20 1 4 3 / 13 u m 4 7 5 0 available voltage version code voltage code voltage code voltage code voltage a 5 f 4.2 l 3.3 r 1.8 b 4.8 g 4 m 3 s 1.5 c 4.7 h 3.8 n 2.8 t 1.3 d 4.5 j 3.6 p 2.7 u 1.2 e 4.3 k 3.5 q 2.5 ordering information part number packaging type marking code s hipping qty um4750s - rn sot23 - 6 uds 3000 pcs/ 7 i nch tape & reel um4750s - rl udt um4750s - nr ugs um4750s - xx 7xx um4750da - xx dfn6 2.0 2.0 7xx um4750db - xx dfn8 3.0 3.0 7xx absolut e maximum ratings (note 1) s ymbol p arameter v alue u nit v in supply voltage on in pin - 0.3 to + 6 .5 v v out voltage on out pin - 0.3 to +7.5 v t j operating junction temperature (notes 2, 3) - 40 to + 125 c t stg storage temperature range - 6 5 to + 150 c t l l ead temperature for soldering 10 s econds + 300 c esd susceptibility hbm 2000 v p d power dissipation at t a = 25c sot23 - 6 0.5 w dfn6 2 .0 to 70 . specifications over the C 40 to 125 operating junction temperature range are guaranteed by design, characterization and correlation with stati stical process controls. note 3 : this ic includes over temperature protection circuit inside that is intended to protect the device during momentary o verload conditions. over temperature protection trip point is around 160 . continuous operation above the specified maximum operating junction temperature may impair device reliability.
________________________________________________________________________ http://www.union - ic.com rev.0 5 mar .20 1 4 4 / 13 u m 4 7 5 0 recommended operating conditions (note 4) supply input voltage 2.5v to 5.5v enable input voltage 0v to 5.5v junction temperature range - 40c to 125c ambient temperature range - 40c to 85c note 4: the device is not guaranteed to function outside its operating conditions. internal block diagram s h u t d o w n a n d l o g i c c o n t r o l c u r r e n t - l i m i t v r e f t h e r m a l p r o t e c t i o n s h u t d o w n a n d l o g i c c o n t r o l c u r r e n t - l i m i t + - 1 . 2 v e r r o r a m p l i f i e r 1 . 2 v - + e r r o r a m p l i f i e r e n 2 e n 1 v i n v o u t 1 g n d v o u t 2 g n d
________________________________________________________________________ http://www.union - ic.com rev.0 5 mar .20 1 4 5 / 13 u m 4 7 5 0 electrical characteristics v cc =+5 v 10%, c in =1 f, c out1 = c out2 =1 f , t a = - 40 to +85 .typical conditions are at vcc=5v, t a =25 . parameter symbol test conditions min typ max unit input voltage range v in 2.5 5.5 v output voltage range v out 1.2 5.0 v operating quiescent current i q i out =0ma 1 1 0 19 0 a q_sd en1=en2=gnd 2 a en en=v in or gnd 1 a out 300 ma output voltage accuracy i out =1 0 ma - 2 2 % dropout voltage v do i out =100ma , v out > 2.8v 100 200 mv output current limit i limt 330 450 700 ma startup time response t r l =68, c out =1f 20 s il v in =2.5v to5.5v 0.3v in v en input high voltage v ih 0.7v in v output voltage tc 100 ppm/ shdn 150 t shdn 30 out 4v out +1 vv in 5.5v out =10ma 0.3 %/v 4v2.5v , i out =10ma 0.6 load regulation ldr v out 4v 1mai out 300ma 0.6 % 4v ________________________________________________________________________ http://www.union - ic.com rev.0 5 mar .20 1 4 6 / 13 u m 4 7 5 0 typical perfor mance characteristics um475 0 s - nr um475 0 s - nr um475 0 s - nr vout1 =2.8v v out 2 =1.8v v out 2=1.8v vout1 =2.8v vout1 =2.8v v out 2 =1.8v um475 0 s - nr vout1 =2.8v v out 2 =1.8v um475 0 s - nr um475 0 s - nr vin=5.0v quiescent current vs input voltage 70 75 80 85 90 95 100 105 110 115 120 125 130 2.5 3 3.5 4 4.5 5 5.5 6 input voltage (v) quiescent current (ua) output voltage vs input voltage 2.72 2.73 2.74 2.75 2.76 2.77 2.78 2.79 2.8 2.81 2.82 2.5 3 3.5 4 4.5 5 5.5 6 input voltage(v) output_1 voltage(v) 1.7 1.72 1.74 1.76 1.78 1.8 1.82 1.84 1.86 1.88 1.9 output_2 voltage(v) vout2 vout1 dropout voltage vs output current 0 40 80 120 160 200 240 280 320 360 400 440 480 520 0 25 50 75 100 125 150 175 200 225 250 275 300 output current(ma) dropout voltage(mv) outpout voltage vs output current 2.73 2.74 2.75 2.76 2.77 2.78 2.79 2.80 2.81 2.82 2.83 0 50 100 150 200 250 300 output current(ma) output_1 voltage(v) 1.76 1.77 1.78 1.79 1.8 1.81 1.82 1.83 1.84 1.85 1.86 output_2 voltage(v) output voltage vs temperature 2.70 2.72 2.74 2.76 2.78 2.80 2.82 2.84 -40 -20 0 20 40 60 80 100 120 140 temperature( output_1 voltage(v) 1.74 1.76 1.78 1.80 1.82 1.84 1.86 1.88 output_2 voltage(v)
________________________________________________________________________ http://www.union - ic.com rev.0 5 mar .20 1 4 7 / 13 u m 4 7 5 0 typical performance characteristics (continued) line transient response load transient response vin=3.8 v to 4.8v vin=3. 5v to 4. 5 v ( 2v/div ) v out 1 =2.8v, iout1 =10 ma ( 50mv/div ) ( 2v/div ) ( 50mv/div ) vout2=1.8v, iout2=10ma um4750 s - nr 100 s/div um4750 s - nr 100 s/div um4750s - nr 100 s/div um4750 s - nr 100 s/div iload=20ma to 220ma 100ma/ div iload =1 0ma to 1 20ma 5 0ma/ div v in =2.8v, vou t2 =1.8v vin=3.8v, vout 1 =2.8v 200mv/div 100mv/div
________________________________________________________________________ http://www.union - ic.com rev.0 5 mar .20 1 4 8 / 13 u m 4 7 5 0 t ypic al application circuit pin function v in : unre gulated input supply. a small 1 .0 uf capacitor should be connected from vin to gnd . gnd : ground and heat sink. solder to a ground plane or large pad to maximize heat dissipation . en : enable , active high . this pin is used to put the um475 0 into shutdown. the en pin cannot be left floating and must be tied to the input pin if not used. v out : regulated voltage output. applications information the um475 0 series are 30 0ma very lo w dropout regulator s with micropower q uiescent current and shutdown. the maximum dropout is only 200 mv at the load current of 1 0 0ma . output voltage noise is as low as 2 00 v rms over a 10hz to 100 k hz bandwidth. in addition to the low quiescent current, the um475 0 regulator s incorporate several protection features which make them ideal for use in battery - powered systems. d evice s i nclude current limit and thermal overload pro tection. output capacitance and transient response the um475 0 regulator s are designed to be stable with a wide range of output capacitors. the esr of the output capacitor affects stability, most notably with small capaci tors. a minimum output capacitor of 1 f with an esr of 0.3 or less is recommended to ensure stability. the um475 0 series are micropower device s and output transient response will be a function of output capacitance. larger values of output capacitance decrease the peak deviations and provide improved transient response for larger load current changes. extra consideration must be given to the use of ceramic capacitors. the x5r and x7r dielectrics result in more stable characteristics and are more suitable for use as the output capacitor. the x 7r type has better stability across temperature, while the x5r is less expensive and is available in higher values. board layout recommendations to improve psrr and noise performance to improve ac performance such as psrr, output noise, and transient res ponse, it is recommended that the board be designed with separate ground planes for vin and vout, with each ground plane connected only at the gnd pin of the device. in addition, the ground connection for the output capacitor should connect directly to the gnd pin of the device. high esr capacitors may degrade psrr. v i n e n 1 e n 2 g n d v o u t 2 v o u t 1 v i n c i n 1 f c h i p e n a b l e c o u t 2 1 f c o u t 1 1 f v o u t 1 v o u t 2
________________________________________________________________________ http://www.union - ic.com rev.0 5 mar .20 1 4 9 / 13 u m 4 7 5 0 internal current limit the um475 0 internal current limits help protect the regulator during fault conditions. during current limit, the output sources a fixed amount of current that is largel y independent of output voltage. for reliable operation, the device should not be operated in a limit state for extended periods of time. the pmos pass element in the um475 0 has a built - in body diode that conducts current when the voltage at out exceeds th e voltage at in. this current is not limited, so if extended reverse voltage operation is anticipated, external limiting to 5% of rated output current may be appropriate. dropout voltage the um475 0 use a pmos pass transistor to achieve low dropout. when (vin - vout) is less than the dropout voltage, the pmos pass device is in its linear region of operation and the input - to - output resistance is the rds of the pmos pass element. vd r o p approximately scales with output current because the pmos device behaves li ke a resistor in dropout. thermal protection thermal protection disables the output when the junction tempera ture rises to approximately +1 50 allowing the device to cool. when the junction temper ature cools to approximately +1 2 0 the output circuit is again enabled. depending on power dissipation, thermal resistance, and ambient temperature, the thermal protection circuit may circle on and off . this cycling limits the dissipation of the regulator, protecting it from damage due to overheating. thermal considerations thermal protection limits power dissipation in um475 0 . when the operation junction temperature exceeds 150 , the otp circuit star ts the thermal shutdown function and turns the pass element off. the pass element turns on again after the junction temperature cools by 25 . for continuous operation, do not exceed absolute maximum operation junction temperature 125 . the power dissipatio n definition in device is: p d = ( v in - v out1 ) i out1 + ( v in - v out2 ) i out2 + v in i q the maximum power dissipation depends on the thermal resistance of ic package, pcb layout, the rate of surroundings airflow and temperature difference between junctions to am bient. the recommended maximum power dissipation of sot23 - 6 , dfn 6 2 .0 2 .0 and dfn 8 3 .0 3 .0 package s for 25 ambient temperature are 0.5w, 0.7 w and 0.9 w .
________________________________________________________________________ http://www.union - ic.com rev.0 5 mar .20 1 4 10 / 13 u m 4 7 5 0 package information um475 0 s - xx sot23 - 6 outline drawing dimensions symbol millimeters inches min max min max a 1.050 1.250 0.041 0.049 a1 0.000 0.100 0.000 0.004 a2 1.050 1.150 0.041 0.045 b 0.300 0.500 0.012 0.020 c 0.100 0.200 0.004 0.008 d 2.820 3.020 0.111 0.119 e 1.500 1.700 0.059 0.067 e1 2.650 2.950 0.104 0.116 e 0.950ref 0.037ref e1 1.800 2.000 0.071 0.079 l 0.600ref 0.023ref l1 0.300 0.600 0.012 0.024 0 8 0 8 land pattern notes: 1. compound dimension: 2.92 1 .60 2. unit: mm; 3. general tolerance 0.0 5 mm unless otherwise specified; 4. the layout is just for reference. tape and reel orientation e 1 b d e e 1 e 0 . 7 0 . 9 0 . 9 5 0 . 9 5 2 . 4 m 7 x x
________________________________________________________________________ http://www.union - ic.com rev.0 5 mar .20 1 4 11 / 13 u m 4 7 5 0 um475 0 d a - xx dfn 6 2 .0 2 .0 outline drawing dimensions symbol millimeters min typ max a 0.57 0.60 0.63 a1 0 0.03 0.05 a 3 0.15typ b 0.20 0.25 0.30 d 1.95 2.00 2.075 e 1.95 2.00 2.075 d2 1.45 1.55 1.65 e 2 0.76 0.86 0.96 e 0.65typ l 0.30 0.35 0.40 land pattern notes: 1. compound dimension: 2.00 2.00; 2. unit: mm; 3. general tolerance 0.0 5 mm unless otherwise specified; 4. the layout is just for refe rence. tape and reel orientation d 2 / 2 d 2 d e 2 / 2 e 2 e e b l r 0 . 1 0 0 b o t t o m v i e w a 1 a a 3 s i d e v i e w 1 . 0 0 1 . 2 0 2 . 5 0 0 . 6 5 0 . 6 5 0 . 2 5 7 x x m
________________________________________________________________________ http://www.union - ic.com rev.0 5 mar .20 1 4 12 / 13 u m 4 7 5 0 um475 0 d b - xx dfn 8 3.03.0 outline drawing dimensions symbo l millimeters inches min max min max a 0.7 0.8 0.028 0.031 a1 0 0.05 0 0.002 a3 0.2 ref 0.008 ref b 0.25 0.35 0.01 0.014 d 2.95 3.05 0.116 0.12 e 2.95 3.05 0.116 0.12 d2 2.3 2.55 0.091 0.1 e2 1.5 1.75 0.059 0.069 e 0.650bsc 0.026bsc l 0.3 0.5 0.012 0.02 land pattern notes: 1. compound dimension: 3.00 3 .00 ; 2. unit: mm; 3. general tolerance 0.0 5 mm unless otherwise specified; 4. the layout is just for reference. tape and reel orientation d e e 2 d 2 e b l a 1 a a 3 0 . 6 5 0 . 3 5 0 . 7 5 1 . 7 3 . 6 7 x x m
________________________________________________________________________ http://www.union - ic.com rev.0 5 mar .20 1 4 13 / 13 u m 4 7 5 0 important notice the information in this document has been carefully review ed and is believed to be accurate. nonetheless, this document is subject to change without notice. union assumes no responsibility for any inaccuracies that may be contained in this document, and makes no commitment to update or to keep current the contain ed information, or to notify a person or organization of any update. union reserves the right to make changes, at any time, in order to improve reliability, function or design and to attempt to supply the best product possible. union semiconducto r, inc add : 2 f, no. 3 , lane647 songtao road, shanghai 201203 tel: 021 - 5109 3966 fax: 021 - 51026018 website: www.union - ic.com

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