unisonic technologies co., ltd ur5516 linear integrated circuit www.unisonic.com.tw 1 of 9 copyright ? 2007 unisonic technologies co., ltd qw-r101-015,d 3a bus termination regulator ? description the utc ur5516 is designed to provide a regulated voltage with bi-directional output current for ddr-sdram termination. current-limit work to limit the s hort-circuit current, on-chip thermal shutdown provides protection agai nst any combination of overload that would create excessive juncti on temperature. the output voltage tracks the voltage at v ref pin. a resistor divider connected to v in , gnd and v ref pins is used to provide a half voltage of v in to v ref pin. in addition, an external ceramic capacitor and an open-drain transistor connected to v ref pin provides soft-start and shutdown control respectively. pulling and holding the v ref to gnd shuts off the output. the output of utc ur5516 will be high impedance after being shut down by v ref or thermal shutdown function. ? 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 sop-8 hsop-8 to-263-5 to-252-5 1 1 *pb-free plating product number: ur5516l ? ordering information ordering number normal lead free plating package packing ur5516-s08-r ur5516l-s08-r sop-8 tape reel ur5516-s08-r ur5516l-s08-r sop-8 tube ur5516-sh2-r ur5516l-sh2-r hsop-8 tape reel ur5516-sh2-r ur5516l-sh2-r hsop-8 tube ur5516-tn5-r ur5516l-tn5-r to-252-5 tape reel ur5516-tn5-t ur5516l-tn5-t to-252-5 tube ur5516-tq5-r ur5516l-tq5-r to-263-5 tape reel ur5516-tq5-t ur5516l-tq5-t to-263-5 tube
ur5516 linear integrated circuit unisonic technologies co., ltd 2 of 9 www.unisonic.com.tw qw-r101-015,d ? pin configuration v in gnd v ref v out v cntl v cntl v cntl v cntl 8 7 6 5 4 3 2 1 sop-8 nc: no connection ? pin description pin name i/o description v in i main power input pin. connect this pin to a voltage source and an input capacitor. the utc ur5516 sources current to v out pin by controlling the upper npn pass transistor, providing a current path from vin pin. gnd o power and signal ground. connect this pin to system ground plane with shortest traces. the utc ur5516 sinks current from v out pin by controlling the lower npn pass transistor, providing a current path to gnd pin. this pin is also the ground path for internal control circuitry. v cntl i power input pin for internal control circui try. connect this pin to a voltage source, providing a bias for the internal control circuitry. a bypass capacitor is usually connected near this pin. v ref i reference voltage input and active-low shutdown control pin. apply a voltage to this pin as a reference voltage for the utc ur5516 . connect this pin to a resistor divider, between v in and gnd, and a capacitor for soft-start and filtering noise purposes. applying and holding this pin low by an open-dr ain transistor to shut down the output. v out o output pin of the regulator. connect this pin to load. output capacit ors connected this pin improves stability and transient response. the output voltage tracks the reference voltage and is capable of sourcing or sinking current up to 3a. ? thermal data parameter symbol ratings unit sop-8 160 hsop-8 80 to-252-5 80 thermal resistance to-263-5 ja 50 c/w
ur5516 linear integrated circuit unisonic technologies co., ltd 3 of 9 www.unisonic.com.tw qw-r101-015,d ? block diagram
ur5516 linear integrated circuit unisonic technologies co., ltd 4 of 9 www.unisonic.com.tw qw-r101-015,d ? absolute maximum ratings parameter symbol ratings unit v cntl supply voltage, v cntl to gnd v cntl -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 cntl supply voltage (note 1) v cntl 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 cntl -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.
ur5516 linear integrated circuit unisonic technologies co., ltd 5 of 9 www.unisonic.com.tw qw-r101-015,d ? electrical characteristics (t j =25c,v cntl =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 cntl supply current i cntl 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
ur5516 linear integrated circuit unisonic technologies co., ltd 6 of 9 www.unisonic.com.tw qw-r101-015,d ? applications circuit 1. general application 2. for v out =1.25v/0.9v 3. for v out =1.4v
ur5516 linear integrated circuit unisonic technologies co., ltd 7 of 9 www.unisonic.com.tw qw-r101-015,d ? 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, 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 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
ur5516 linear integrated circuit unisonic technologies co., ltd 8 of 9 www.unisonic.com.tw qw-r101-015,d ? operatng waveforms(cont.) 3. load transient response: i out = +3a -> -3a -> +3a - 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 4. short-circuit test - v in = 2.5v, v cntl = 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
ur5516 linear integrated circuit unisonic technologies co., ltd 9 of 9 www.unisonic.com.tw qw-r101-015,d ? typical characteristics v ref bias current, i bias ( 0 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 cntl =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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