unisonic technologies co., ltd ur6515c linear integrated circuit www.unisonic.com.tw 1 of 8 copyright ? 2012 unisonic technologies co., ltd qw-r101-038.a 2a ddr bus termination regulator ? description the ur6515c is a linear regulator providing up to 2a transient peak current sourcing and sinking capability for ddr sdram bus terminator applications while regul ating an output voltage to within 40mv. it contains a high speed operat ional amplifier which provides fast load transient response and only requires 10uf of ceramic output capacitance. the ur6515c output termination voltage 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/ddr3 termination voltage applications *sink and source current 2a contious 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 ? ordering information ordering number package packing lead free halogen free ur6515cl-sh2-r UR6515CG-SH2-R hsop-8 tape reel ur6515cl-sh2-t ur6515cg-sh2-t hsop-8 tube
ur6515c linear integrated circuit unisonic technologies co., ltd 2 of 8 www.unisonic.com.tw qw-r101-038.a ? pin configurations 4 3 2 1 5 6 7 8 gnd v in gnd v ref v out nc nc nc v cntl ? pin description pin name pin type pin description v cntl i power supply pin for the internal control circuits gnd - ground pin v in i power supply pin for the v out output v ref i reference voltage input and active-low shutdown control pin v out o output voltage pin
ur6515c linear integrated circuit unisonic technologies co., ltd 3 of 8 www.unisonic.com.tw qw-r101-038.a ? block diagram
ur6515c linear integrated circuit unisonic technologies co., ltd 4 of 8 www.unisonic.com.tw qw-r101-038.a ? absolute maximum rating parameter symbol ratings unit v cntl control voltage v cntl +6 v v in supply voltage v in +6 v power dissipation (t a =25c) p d 1.33 w junction temperature t j 125 c storage temperature t stg -65 ~ +150 c note: absolute maximum ratings are those values be yond 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 junction to ambient (note 1) ja 75 c/w junction to case jc 28 c/w note: 1. ja is measured in the natural convection at t a = 25c 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 3.3 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 v out tracks the v ref with additional voltage offset and load regulation. ? electrical characteristics (t a =25c, unless otherwise specified) (v in =2.5v/1.8v/1.5v, v cntl =3.3v, v ref =1.25v/0.9v/0.75v, 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 v load i out =2a -20 20 mv protection current limit i limit v in =2.5v/1.8v/1.5v 2.2 a thermal shutdown temperature t sd v cntl =3.3v~5v 125 170 c thermal shutdown hysteresis t sd v cntl =3.3v~5v 35 c v ref shutdown shutdown threshold v ih enable 0.6 v v il shutdown 0.2 v
ur6515c linear integrated circuit unisonic technologies co., ltd 5 of 8 www.unisonic.com.tw qw-r101-038.a ? typical applications circuits r 1 =r 2 =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
ur6515c linear integrated circuit unisonic technologies co., ltd 6 of 8 www.unisonic.com.tw qw-r101-038.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) output voltage transient (mv) output current (a) output voltage transient (mv) output current (a)
ur6515c linear integrated circuit unisonic technologies co., ltd 7 of 8 www.unisonic.com.tw qw-r101-038.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 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) output short circuit protection v in =1.5v, v cntl =3.3v, v out =0.75v output short current (a) time (1ms/div) output short circuit protection v in =1.5v, v cntl =3.3v, v out =0.75v output short current (a) time (1ms/div)
ur6515c linear integrated circuit unisonic technologies co., ltd 8 of 8 www.unisonic.com.tw qw-r101-038.a ? typical characteristics(cont.) -50 -25 0 25 50 75 100 125 0.74 0.745 0.75 0.755 0.76 0.765 0.77 output voltage, v out (v) temperature(c) output voltage vs. temperature v in =1.5v -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) 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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