unisonic technologies co., ltd ur6515a linear integrated circuit www.unisonic.com.tw 1 of 9 copyright ? 2011 unisonic technologies co., ltd qw-r102-044.a 3a ddr bus termination regulator ? description the ur6515a is a linear regulator providing up to 3a transient peak current sourcing and sinking capability for ddr sdram bus terminator applications while regulating an output voltage to within 40mv. it contains a high speed operational amplifier which provides fast load transient response and only requires 10uf of ceramic output capacitance. the ur6515a output termination volta ge tracks the reference voltage applied at v ref pin. a resistor divider connected to v in , gnd and v ref pins is used to force the reference voltage to v ref pin. additional features include current limiting protection and thermal shutdown protection. ? features *ddr1/ ddr2 termination voltage applications *low output voltage offset within 20mv *source and sink 3a peak current *adjustable output voltage by external resistors *integrated power mos devices *suspend to ram(str) functionality *current limiting protection *thermal shutdown protection *cost-effective and easy to use to-252-5 1 1 to-263-5 ? ordering information ordering number lead free halogen free package packing UR6515L-TN5-R ur6515g-tn5-r to-252-5 tape reel ur6515l-tq5-r ur6515g-tq5-r to-263-5 tape reel ur6515l-tq5-t ur6515g-tq5-t to-263-5 tube
ur6515a linear integrated circuit unisonic technologies co., ltd 2 of 9 www.unisonic.com.tw qw-r102-044.a ? pin configurations ? pin description pin name pin type pin description vin i power supply pin for the vout output gnd o ground pin vcntl i power supply pin for the internal control circuits vref i reference voltage input and active-low shutdown control pin vout o output voltage pin
ur6515a linear integrated circuit unisonic technologies co., ltd 3 of 9 www.unisonic.com.tw qw-r102-044.a ? block diagram
ur6515a linear integrated circuit unisonic technologies co., ltd 4 of 9 www.unisonic.com.tw qw-r102-044.a ? absolute maximum rating (unless otherwise specified) parameter symbol ratings unit v cntl control voltage v cntl 7 v v in supply voltage v in 7 v to-252-5 1.471 power dissipation (ta=25c) to-263-5 p d 1.923 w junction temperature t j 125 c storage temperature t stg -65 ~ +150 c note: absolute maximum ratings are those values beyo nd which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device oper ation is not implied. ? thermal data parameter symbol ratings unit to-252-5 68 junction to ambient (note 1) to-263-5 ja 52 c/w to-252-5 8 junction to case to-263-5 jc 7.7 c/w note: 1. ja is measured in the natural convection at ta = 25 c on a high effective thermal conductivity test board of jedec 51-7 thermal measurement standard ? recommended operating conditions (note 1) parameter symbol ratings unit v cntl control voltage v cntl 5 or 3 5% v v in supply voltage v in 2.5~1.5 3% v v ref input voltage v ref 1.25~0.75 3% v junction temperature t j -40~+125 c notes: 1. all voltage values are with respect to the network ground terminal unless otherwise noted. 2. the vout tracks the vref with additio nal voltage offset and load regulation. ? electrical characteristics (ta=25c, unless otherwise specified) (v in =2.5v/1.8v, v cntl =3.3v, v ref =1.25v/0.9v, c out = 10f (ceramic)) parameter symbol test conditions min typ max unit input current operation current of v cntl i cntl i out =0a 1 2.5 ma standby current i stb v ref <0.2v, r load =180 ? 50 90 a output voltage (ddr/ddr ii/ddr iii) output voltage offset (v ref -v out ) v os i out =0a -20 20 mv load regulation(ddr1/2) v load i out =1.5a 0.8/1.2 2/3 % protection current limit i limit v in =2.5v/1.8v 3 a thermal shutdown temperature t sd v cntl =3.3v~5v 125 150 c thermal shutdown hysteresis t sd v cntl =3.3v~5v 50 c v ref shutdown v ih enable 0.8 v shutdown threshold v il shutdown 0.2 v
ur6515a linear integrated circuit unisonic technologies co., ltd 5 of 9 www.unisonic.com.tw qw-r102-044.a ? typical applications circuits 1 2 3 4 5 v in gnd v cntl v out v ref c in r1 c out c cntl c ss r2 enable 3.3v 2.5v/1.8v v out r1=r2=100k ? , c out =10 f(ceramic)+1000 f under the worst case testing condition c ss =1 f, c in =470 f(low esr), c cnt l=47 f ) v ( v r + r r = v in 2 1 2 ref , v out track v ref
ur6515a linear integrated circuit unisonic technologies co., ltd 6 of 9 www.unisonic.com.tw qw-r102-044.a ? typical characteristics output voltage transient (mv) output current (a) output voltage transient (mv) output current (a) output voltage transient (mv) output current (a) output voltage transient (mv) output current (a)
ur6515a linear integrated circuit unisonic technologies co., ltd 7 of 9 www.unisonic.com.tw qw-r102-044.a ? typical characteristics(cont.) 0 2 4 6 8 10 12 source 0 2 4 6 8 10 sink 0 2 4 6 8 10 12 source 0 2 4 6 8 10 12 sink output short current (a) time (1ms/div) output short circuit protection v in =2.5v, v cntl =3.3v, v out =1.25v v in =2.5v, v cntl =3.3v, v out =1.25v output short current (a) output short circuit protection time (1ms/div) output short circuit protection v in =1.8v, v cntl =3.3v, v out =0.9v output short current (a) time (1ms/div) output short circuit protection output short current (a) v in =1.8v, v cntl =3.3v, v out =0.9v time (1ms/div)
ur6515a linear integrated circuit unisonic technologies co., ltd 8 of 9 www.unisonic.com.tw qw-r102-044.a ? typical characteristics(cont.) -50 -25 0 25 50 75 100 125 0.89 0.895 0.9 0.905 0.91 0.915 0.92 temperature(c) v in =1.8v -50 -25 0 25 50 75 100 125 1.24 1.245 1.25 1.255 1.26 1.265 1.27 output voltage vs. temperature v in =2.5v output voltage, v out (v) output voltage vs. temperature output voltage, v out (v) temperature(c)
ur6515a linear integrated circuit unisonic technologies co., ltd 9 of 9 www.unisonic.com.tw qw-r102-044.a utc assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all utc products described or contained herein. utc products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.
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