unisonic technologies co., ltd ur6516b preliminary cmos ic www.unisonic.com.tw 1 of 6 copyright ? 2010 unisonic technologies co., ltd qw-r502-449.a 2a sink & source adjustable linear bus terminator ? description the utc ur6516b is a low cost linear regulator providing a desired output voltage or termination volt age for various applications by converting voltage supplies ranging from 1v ~ 6.0v. the desired output voltage could be programmable by two external voltage divider resistors. the utc ur6516b can source or sink up to 2a of current while regulating an output voltage to within 2% (ddr-i), 3% (ddr-ii) or less. the utc ur6516b can be used in applications, such as pci/agp graphics, game/play station, set top box, mother board. ? features * ideal for ddr-i ,ddr-ii * output voltage could drop down to 0.6v * source and sink up to 2a, without an external heat sink * integrated power mosfets * output voltage varies though adjusting external resistors * i ccq is lower than 500ua at v cca * thermal shutdown protection, cu rrent limit protection, and short circuit protection circuits included * shutdown for standby or suspend mode operation * requiring minimum external components ? ordering information ordering number package packing UR6516BG-SH2-R hsop-8 tape reel
ur6516b preliminary cmos ic unisonic technologies co., ltd 2 of 6 www.unisonic.com.tw qw-r502-449.a ? pin configuration ? pin description pin no pin name description 1 v in input power 2,7,8 gnd ground 3 nc no connection 4 v out output voltage 5 refen reference voltage input and chip enable 6 v cca voltage supply for internal circuits
ur6516b preliminary cmos ic unisonic technologies co., ltd 3 of 6 www.unisonic.com.tw qw-r502-449.a ? block diagram ea refen v cca v in v out current limit protection thermal gnd
ur6516b preliminary cmos ic unisonic technologies co., ltd 4 of 6 www.unisonic.com.tw qw-r502-449.a ? absolute maximum rating parameter symbol ratings unit v in , v cca v in , v cca 7 v output rms current, source or sink 2 a storage temperature t stg -65~125 c notes: absolute maximum ratings are those values beyond which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device oper ation is not implied. ? operrating rating parameter symbol test conditions min typ max unit input power v in 1 2.5/1.8/1.5 6 v output voltage v out v cca -1.9 v reference voltage input and chip enable refen v cca -1.9 v voltage supply for internal circuits v cca 6 v ? thermal data parameter symbol ratings unit junction to case jc 14 c/w ? electrical characteristics (t a =25c; v in =+2.5v and v cca =+3.3v, v refen =1.25v, unless otherwise specified) (note 1) parameter symbol test conditions min typ max unit output offset voltage (note 2) v os i out =0a -20 20 mv operating current at v in i op no load, cout=200uf 1 ma i l : 0a -> 2a 0.8/1.2 2/3 % load regulation (ddr i/ii) v load i l : 0a -> -2a 0.8/1.2 2/3 % v cca >v out +1.9v, i out =2a 0.3 0.4 v dropout voltage v dropout v cca >v out +1.9v, i out =1.5a 0.2 0.25 v quiescent current at v cca i ccq at room temp. 190 230 a current in shutdown mode i shdn v refen <0.2v, r l = 10 ohm 90 110 a input voltage range (note 3) v in no load 1 2.5/1.8 6 v input voltage range (note 3) v cca r l = 10 ohm 3.15 3.3 6 v short circuit protection current limit i limit 5 a short current i sc ,v in sinking 2 a short current i sc ,g nd sourcing 2 a over thermal protection thermal shutdown temperature thsd 3.15v<=vcca<=6v 125 150 155 c thermal shutdown hysteresis 25 30 35 c refen function refen threshold v refen < v in v refen < vcca ? 1.9v 0.4 0.5 0.6 v notes: 1. maximum ratings are stress ratings only and functional device operat ion is not implied. limits are guaranteed by 100% testing, sampling, or correlation with worst case test conditions 2. v os = v refen ? v out 3. keep v cca >= v in and v cca >= v refen + 1.9v on operation power on and power off sequences 4. guaranteed by des ign, not 100% test
ur6516b preliminary cmos ic unisonic technologies co., ltd 5 of 6 www.unisonic.com.tw qw-r502-449.a ? functional description the utc ur6516b is a low cost linear regulator, which can sink and source 2a of current without an external heat sink. the utc ur6516b incorporates power mosfets that are capable of sourcing and sinking 2a of current while keeping perfect voltage regulation. by using the external fe edback, the output voltage ca n be regulated within 3% or less. separate voltage supply inputs have been added to fi t applications with various power supplies for the databus and power buses. outputs the vout pins (output voltage pins) ar e connected to the databus, address, or clock lines via an external inductor. the output voltage varies dep ending on the input voltage. inputs the output voltage is determined by the input voltage. t he desired output voltage could be programmable by two external voltage divider resistors. the vin pin is suggested to connect to vddq of me mory module for better tracking with memory vddq. other supply voltages vcca provide the voltage supply to the logic section and internal error amplifiers of utc ur6516b .
ur6516b preliminary cmos ic unisonic technologies co., ltd 6 of 6 www.unisonic.com.tw qw-r502-449.a ? typical application circuit v in gnd nc v out gnd gnd v cca refen u1 1 2 3 4 8 7 6 c3 4.7f cein 200f ceout 200f c4 4.7f 1 2 v in v out c2 104 r2 100k q1 en r1 100k c1 104 v cca 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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