unisonic technologies co., ltd lr2126 cmos ic www.unisonic.com.tw 1 of 7 copyright ? 2014 unisonic technologies co., ltd qw-r502-a60.a 1 a fast ultra low dropout linear regulator ? description the utc lr2126 operate from a +2.5v ~ +6.0v input supply as fast ultra low-dropout linear regul ators. wide output voltage range options are available. the fast response characteristic to make utc lr2126 suitable for low voltage microprocessor application. the low quiescent current operation and low dropout quality caused by the cmos process. the utc lr2126 has ultra low dropout voltage 300mv at 1a load current typically. the ground pin current is typically 60ua at 1ma load current. output voltage precision: mult iple output voltage options are available and ranging from 1.2v ~ 5. 0v at room temperature with a guaranteed accuracy of 1.5%, and 3.0% when varying line, load and temperature. ? features * ultra low dropout voltage * low ground pin current * 0.04% load regulation * the guaranteed output current is 1a dc * output voltage accuracy 1.5% * low output capacitor required * over temperature protection and over current protection ? ordering information ordering number package packing lead free halogen free lr2126l-xx-ab5-r lr2126g-xx-ab5-r sot89-5 tape reel
lr2126 cmos ic unisonic technologies co., ltd 2 of 7 www.unisonic.com.tw qw-r502-a60.a ? marking information package voltage code marking sot89-5 ad: adj ? pin assignments ? pin description pin no pin name description 1 en shutdown lr2126 enable; when the en pin connects to gnd will shutdown the lr2126; at normal operation, en must be tied to v dd through a 10k ? pull up resistor. 2 gnd ground. 3 adj adjustable voltage version only ? a resistor divider from this pin to the out pin and ground sets the output voltage. 4 in input voltage. 5 out output voltage. note: the nc pin is electrically open. the nc pin can be connected to v in or gnd.
lr2126 cmos ic unisonic technologies co., ltd 3 of 7 www.unisonic.com.tw qw-r502-a60.a ? block diagram
lr2126 cmos ic unisonic technologies co., ltd 4 of 7 www.unisonic.com.tw qw-r502-a60.a ? absolute maximum ratings parameter symbol ratings unit input voltage (operating) v in 2.5~7.0 v input voltage (survival) -0.3~+7.5 v shutdown input voltage v in ( shdn ) -0.3~v in +0.3 v output voltage (survival), (note 1, 2) v out -0.3~+7.5 v i out (survival) short circuit protected maximum operating current (dc) 1 a power dissipation (note 3) p d internally limited junction temperature t j +125 c operating temperature t opr -40~+125 c storage temperature t stg -65~+150 c note: 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. ? thermal data parameter symbol ratings unit junction to ambient ja 160 c/w ? electrical characteristics t j = 25c, v in = v out(nom) + 1v, i out = 10ma, c in = 4.7 f ,c out = 4.7 f, v en = v in -0.3v, unless otherwise specified.(note 4) parameter symbol test conditions min typ max unit output voltage tolerance (note 5) v out 0ma i out 1a v out +1 v in 6.0v -1.5 -3 0 +1.5 +3 % output voltage line regulation (note 5) v out v out +1v lr2126 cmos ic unisonic technologies co., ltd 5 of 7 www.unisonic.com.tw qw-r502-a60.a ? electrical characteristics(cont.) notes: 1. the lr2126 output must be diode-clamped to ground. if used in a dual-supply system where the regulator load is returned to a negative supply. 2. between the v in and v out terminals the output pmos structure cont ains a diode. this diode is reverse biased normally. if the voltage at the output terminal is fo rced to be higher than the voltage at the input terminal this diode will get forward biased. this diode can wi thstand 1amp of peak current and 200ma of dc current typically. 3. devices must be derated based on package t hermal resistance at elevated temperatures. 4. conditions for which the device is intended to be fu nctional is indicated by operating ratings, but specific performance limits isn?t be guaranteed. to make sure of specifications and test conditions, read electrical characteristics. only for the test conditions listed t he guaranteed specifications can be applied. when the device is not operated under the listed test conditions some performance characteristics may degrade. 5. output voltage line regulation is the change in out put voltage from the nominal value which is due to change in the input line voltage. wh ich is defined as the change in out put voltage from the nominal value due to change in load current is output voltage load regulation. the load regulation and line regulation specification include the typical number only. but, the limits for load and line regulation are included in the output voltage tolerance specification. 6. at which the output drops 2% below the normal val ue dropout voltage is defined as the minimum input to output differential voltage. only to output voltages of 2.5v and above drop out voltage specif ication applies. for output voltages below 2.5v, since the minimum input voltage is 2.5v, the drop -out voltage is nothing but the input to output differential.
lr2126 cmos ic unisonic technologies co., ltd 6 of 7 www.unisonic.com.tw qw-r502-a60.a ? typical application circuit
lr2126 cmos ic unisonic technologies co., ltd 7 of 7 www.unisonic.com.tw qw-r502-a60.a ? typical characteristics dropout voltage vs. output current dropout voltage, v d (mv) output current, i out (ma) 0 50 100 150 200 250 300 0 250 500 750 1000 350 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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