unisonic technologies co., ltd lr1801 preliminary cmos ic www.unisonic.com.tw 1 of 5 copyright ? 2013 unisonic technologies co., ltd qw-r502-a03.d 1 a fast ultra low dropout linear regulator ? description the utc lr1801 operate from a +2v ~ +6v input supply as fast ultra low-dropout linear regul ators. wide output voltage range options are available. the fast response characteristic to make utc lr1801 suitable for low voltage microprocessor application. the low quiescent current oper ation and low dropout quality caused by the cmos process. the utc lr1801 has ultra low dropout voltage 300mv at 1a load current typicall y. 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 ~ 3. 5v 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 * the guaranteed output current is 1a dc * output voltage accuracy 1.5% * over temperature protection and over current protection ? ordering information ordering number package packing lead free halogen free lr1801l-xx-sh2-t lr1801g-xx-sh2-t hsop-8 tube lr1801l-xx-sh2-r lr1801g-xx-sh2-r hsop-8 tape reel
lr1801 preliminary cmos ic unisonic technologies co., ltd 2 of 5 www.unisonic.com.tw qw-r502-a03.d ? marking information package voltage code marking hsop-8 12: 1.2v 15 : 1.5v 18: 1.8v 25: 2.5v 33: 3.3v ? pin configuration 1 nc nc nc nc 2 3 4 5 6 7 8 v in v out gnd gnd on/ off ? pin description pin no. pin name pin description 1 v out output voltage 2 on /off on/off select pin, when connected to t he ground the chip in operating normally. 3, 5,6,7 nc no connection 4 gnd gnd 8 v in input voltage note: the nc pin is electrically open. the nc pin can be connected to v in or gnd. ? block diagram
lr1801 preliminary cmos ic unisonic technologies co., ltd 3 of 5 www.unisonic.com.tw qw-r502-a03.d ? absolute maximum ratings parameter symbol ratings unit input voltage v in 7 v shutdown input voltage v in ( shdn ) -0.3~v in v maximum operating current (dc) 1 a power dissipation (note 3) p d internally limited junction temperature t j +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 143 c/w junction to case jc 45 c/w ? electrical characteristics (t j = 25c, unless otherwise specified.) parameter symbol test conditions min typ max unit input voltage v in 2 6 v output voltage (note 4) v out(e) v in =v out(s) +1v i out =100ma 1.0v v out(s) <1.5v v out(s) - 0.015 v out(s) v out(s) + 0.015 v 1.5v v out(s) 3.5v v out(s) x 0.99 v out(s) v out(s) x 1.01 v output voltage line regulation v out1 / (v in v out ) v out(s) +0.5v v in 5.5v,i out =100ma 0.05 0.2 %/v output voltage load regulation v out2 v in =v out(s) +1v,1ma i out 300ma -20 -3 20 mv dropout voltage(note 5) v drop i out =300ma 1.2v v out ( s ) <1.5v 0.34 0.38 v 1.5v v out ( s ) <2.6v 0.10 0.15 2.6v v out ( s ) 3.5v 0.07 0.10 i out =1000ma 1.2v v out ( s ) <1.5v 0.70 1.5v v out ( s ) <2.0v 0.40 2.0v v out ( s ) <2.6v 0.32 2.6v v out ( s ) 3.5v 0.23 output current(note 6) i out v in v out(s) +1v 1000 (note 8) ma ground pin current in normal operation mode i ss1 v in =v out(s) +1v, on/off pin=on, no load 60 90 ua ground pin current in power-off mode i ss2 v in =v out(s) +1v, on/off pin=off, no load 0.1 1.0 ua short circuit current i sc v in =v out(s) +1v, on/off pin=on, v out =0v 200 ma output voltage temperature coefficient(note 7) v out / (t a v out ) v in =v out(s) +1v,i out =100ma, -40c t a +85c 100 ppm/c on/off pin input voltage ?h? v sh v in =v out(s) +1v, r l =1.0k ? determinied by v out output level 1.0 v on/off pin input voltage ?l? v sl 0.3
lr1801 preliminary cmos ic unisonic technologies co., ltd 4 of 5 www.unisonic.com.tw qw-r502-a03.d ? electrical characteristics (cont.) parameter symbol test conditions min typ max unit on/off pin input current ?h? i sh v in =v out ( s ) +1v,v on/off =5.5v -0.1 0.1 ua on/off pin input current ?l? i sl v in =v out ( s ) +1v,v on/off =0v -0.1 0.1 ua ripple rejection |rr| v in =v out(s) +1v, f=1khz, v rip =0.5vrms, i out =100ma 1.2v v out ( s ) <3.0v 65 db 3.0v v out(s) 3.5v 60 thermal shutdown detection temperature t sd junction temperature 150 c thermal shutdown release temperature t sr junction temperature 120 c notes: 1. the lr1801 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 contains a dio de. this diode is reverse biased normally. if the voltage at t he output terminal is forced to be hi gher than the voltage at the input terminal this diode will get forward biased. this dio de can withstand 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. v out(s) : specified output voltage v out(e) : actual output voltage output voltage when fixing i out (=100ma) and inputting v out(s) +1.0v 5. vdrop=v in1 -(v out3 0.98) v out3 is the output voltage when v in =v out(s) +1.0v and i out =300ma, 1000ma. 6. the output current at which t he output voltage becomes 95% of v out(e) after gradually increasing the output current. 7.the change in temperature [mv/c] is calculated using the following equation. () / / 1000 out out out s aaout vv mv c v v ppm c ttv ?? ?? ? ?? ?? ?? ? ? ?? ?? ? ? ??? 8.the output current can be at least this value. due to restrictions on the package power dissipation, this value may not be satisfied. attention should be paid to the power dissipation of the package when the output current is large. this specification is guaranteed by design.
lr1801 preliminary cmos ic unisonic technologies co., ltd 5 of 5 www.unisonic.com.tw qw-r502-a03.d ? typical application circuit (1) on/off pins must be pulled high through a 10k ? pull-up resistor. (2) generally a series regulator may cause oscillation, de pending on the selection of external parts. the following conditions are recommended for this ic. however, be su re to perform sufficient evaluation under the actual usage conditions for selection, including ev aluation of temperatur e characteristics. input capacitor (c in ): 2.2 f or more output capacitor (c l ): 2.2 f or more 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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