unisonic technologies co., ltd UR5516B linear integrated circuit www.unisonic.com.tw 1 of 9 copyright ? 2007 unisonic technologies co., ltd qw-r101-019.a 3a bus termination regulator ? description the utc UR5516B is a low cost linear regulator designed to provide a desired output voltage or termination voltage for various applications by converting voltag e supplies ranging from 1v to 6.0v. the desired output voltage could be programmable by two external voltage divider resistors. the UR5516B is capable of sourcing or sinking up to 2a of current while regulating an output vout voltage to within 2% (ddr-i), 3% (ddr-ii) or less. the UR5516B provides low profile 8-pin soic package to save system space. ? features * provide bi-direction current - sourcing or sinking current up to 3a * 1.25v/0.9v output for ddr i/ii applications * fast transient response * high output accuracy - 20mv over load, v out offset and temperature * adjustable output voltage by external resistors * current-limit protection * on-chip thermal shutdown * shutdown for standby or suspend mode *pb-free plating product number: UR5516Bl ? ordering information ordering number normal lead free plating package packing UR5516B-s08-r UR5516Bl-s08-r sop-8 tape reel UR5516B-s08-t UR5516Bl-s08-t sop-8 tube
UR5516B linear integrated circuit unisonic technologies co., ltd 2 of 9 www.unisonic.com.tw qw-r101-019.a ? pin configuration ? pin description pin no. pin name description 1 v in input power 3 nc no connection 4 v out output voltage 5 v ref reference voltage input and chip enable 6 v cca voltage supply for internal circuits 2,7,8 gnd ground ? thermal data parameter symbol ratings unit thermal resistance jc 14 c/w
UR5516B linear integrated circuit unisonic technologies co., ltd 3 of 9 www.unisonic.com.tw qw-r101-019.a ? block diagram
UR5516B linear integrated circuit unisonic technologies co., ltd 4 of 9 www.unisonic.com.tw qw-r101-019.a ? absolute maximum ratings parameter symbol ratings unit v cca supply voltage, v cca to gnd v cca -0.2 ~ 7 v v in supply voltage, v in to gnd v in -0.2 ~ 3.9 v power dissipation p d internally limited w junction temperature t j +150 c storage temperature t stg -40 ~ +150 c note absolute maximum ratings are those values beyond which the device could be permanently damaged. absolute maximum ratings are stress ratings only an d functional device operat ion is not implied. ? recommended operating conditions parameter symbol ranges unit v cca supply voltage (note 1) v cca 3.1 ~ 6 v v in supply voltage (note 2) v in 1.2 ~ 3.5 v v ref input voltage v ref 0.85 ~ 1.75 v v out output voltage (note 3) v out v ref 0.02 v v out output current (note 4,5) i out -3 ~ +3 a junction temperature t j 0 ~ +125 c note: 1. please always keep v cca -v out >1.9v for good regulation. 2. please supply enough voltage to v in for sourcing desired maximum output current. please refer to the v in dropout voltage vs. output current in the typical characteristics. 3. the v out is regulated to the v ref with additional voltage offset and load regulation except over-load conditions. 4. the symbol ?+? means the v out sources current to load; the symbol ?-? means the v out sinks current to gnd. 5. the max. i out varies with the t j and the voltages of v in -v out and v out . please refer to the typical characteristics.
UR5516B linear integrated circuit unisonic technologies co., ltd 5 of 9 www.unisonic.com.tw qw-r101-019.a ? electrical characteristics (t j =25c, v cca =3.3v,v in =2.5v/1.8v,v ref =0.5v in ,unless otherwise specified) parameter symbol test conditions min typ max unit output voltage v out i out =0a v ref v system accuracy over temperature, v out offset, and load regulation -20 20 mv i out =+10ma -20 offset voltage (v out ?v ref ) v o(off) i out =-10ma 20 mv i out =+10ma ~ +3a 2 load regulation ? v out i out = -10ma ~ -3a 2 % t j =25c +3 +3.6 sourcing current (v in =2.5v) t j =125c +3.1 t j =25c -3 -3.6 sinking current (v in =2.5v) t j =125c -3.1 t j =25c +2.9 +3.2 sourcing current (v in =1.8v) t j =125c +2.6 t j =25c -2.9 -3.2 current limit i limit sinking current (v in =1.8v) t j =125c -2.6 a thermal shutdown temperature t shdn rising t j 183 c thermal shutdown hysteresis t hys 42 c i out =0a 1 2 3 i out =3a (normal operation) 50 110 v cca supply current i cca v ref =gnd (shutdown) 2.0 ma v ref =1.25v/0.9v (normal operation) 200 500 na v ref bias current (the current flows out of v ref ) i bias v ref =gnd (shutdown) 20 40 a shutdown threshold voltage v shdn 0.2 0.35 0.65 v
UR5516B linear integrated circuit unisonic technologies co., ltd 6 of 9 www.unisonic.com.tw qw-r101-019.a ? applications circuit 1. general application 2. for v out =1.25v/0.9v 3. for v out =1.4v
UR5516B linear integrated circuit unisonic technologies co., ltd 7 of 9 www.unisonic.com.tw qw-r101-019.a ? operating waveforms 1. load transient response: i out = +10ma -> +3a -> +10ma - v in = 2.5v, v cntl = 3.3v - v ref is 1.250v supplied by a regulator - c out = 470f/10v, esr = 30m ? - i out slew rate = 3a/s 2. load transient response: i out = -10ma -> -3a -> -10ma - v in = 2.5v, vcca = 3.3v - v ref is 1.250v supplied by a regulator - c out = 470f/10v, esr = 30m ? - i out slew rate = 3a/s i out = -10ma -> -3a -> -10ma ch1 : v out , 20mv/div, dc, offset = 1.250v ax1 : i out , 1a/div time : 20 0 s/div v out -3a at ic +10ma i out load regulation = +6.5mv
UR5516B linear integrated circuit unisonic technologies co., ltd 8 of 9 www.unisonic.com.tw qw-r101-019.a ? operatng waveforms(cont.) 3. load transient response: i out = +3a -> -3a -> +3a - v in = 2.5v, v cca = 3.3v - v ref is 1.250v supplied by a regulator - c out = 470f/10v, esr = 30m ? - i out slew rate = 3a/s 4. short-circuit test - v in = 2.5v, v cca = 3.3v v out is shorted to gnd ch1 : v out , 500mv/div, dc, offset = 1.250v ax1 : i out , 2a/div time : 5ms/div v out i out at ic v out is shorted to v in (2.5v) ch1 : v out , 500mv/div, dc, offset = 1.250v ax1 : i out , 2a/div time : 5ms/div v out at ic i out i out v out
UR5516B linear integrated circuit unisonic technologies co., ltd 9 of 9 www.unisonic.com.tw qw-r101-019.a ? typical characteristics v ref bias current, i bias (a) dropout voltage (v) 1.2 1.0 0.6 0.4 0.2 0.0 0.0 0.5 1.0 1.5 2.5 3.0 output current (a) v in dropout voltage vs. output current 0.8 2.0 t j = 25c v ref =0.9v v cca =5.0v 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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