unisonic technologies co., ltd lr1803 preliminary linear integrated circuit www.unisonic.com.tw 1 of 7 copyright ? 2016 unisonic technologies co., ltd qw-r102-081.a 700ma high speed ldo regulator with reverse current protection ? description the utc lr1803 operate from a +1.7v ~ +6v input supply as fast low-dropout linear regulators. wide output voltage range options are available. the fast response characteristic to make utc lr1803 suitable for low voltage microprocessor application. the low quiescent current oper ation and low dropout quality caused by the cmos process. the utc lr1803 has low dropout voltage. the ground pin current is typically 100 a. output voltage pr ecision: multiple output voltage options are availa ble and ranging from 1.5v~5v at room temperature with a guaranteed accuracy of 1.5%, and 3.0% when varying line and load. with the reverse current protection unction of a driver transis tor, the reverse current flow is prohibited when v out voltage is higher than vin voltage. for an example, when a battery is connected to the v out pin, battery current will not flow back to the utc lr1803 . ? features * the guaranteed output current is 700ma dc * low power consumption: 100 a * dropout voltage: 120mv @i out =300ma (v out =3.0v) * output voltage accuracy 1.5% * the reverse current protection 1 sot-89-5 sot-25 1 3 5 2 4 ? ordering information ordering number package packing lr1803g-xx-ab5-r sot-89-5 tape reel LR1803G-XX-AF5-R sot-25 tape reel note: xx: output voltage, refer to marki ng information.
lr1803 preliminary linear integrated circuit unisonic technologies co., ltd 2 of 7 www.unisonic.com.tw qw-r102-081.a ? marking information package voltage code marking sot-25 sot-89-5 15 : 1.5v 18: 1.8v 25: 2.5v 28: 2.8v 30: 3.0v 33: 3.3v 50: 5.0v ? pin configuration ? pin description pin no. sot-25 sot-89-5 pin name description 1 4 v in power input 2 2 v ss ground 3 1 ce on/off control 4 3 nc no connection 5 5 v out output
lr1803 preliminary linear integrated circuit unisonic technologies co., ltd 3 of 7 www.unisonic.com.tw qw-r102-081.a ? block diagram
lr1803 preliminary linear integrated circuit unisonic technologies co., ltd 4 of 7 www.unisonic.com.tw qw-r102-081.a ? absolute maximum rating parameter symbol ratings unit input voltage v in 6.5 v output voltage v out 6.5 v ce input voltage v ce 6.5 v sot-25 250 mw power dissipation sot-89-5 p d 500 mw operating ambient temperature t opr -40 ~ +85 c storage temperature t stg -55 ~ +125 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. ? electrical characteristics (t a =25c) parameter symbol circuit test conditions min typ max unit output voltage v out(e) 1 v ce =v in , i out =10ma 0.985 v out(t) 1.015 v output current i outmax 1 v ce =v in , v in =v out(t) +1.0v 700 ma load regulation ? v out 1 v ce =v in , 0.1ma i out 300ma -20 5 20 mv dropout voltage v dif 1 i out =300ma, v ce =v in 120 300 mv supply current i ss 2 v in =v ce =v out(t) +1.0v, i out =0ma 100 200 a stand-by current i stby 2 v in =6.0v, v ce =v ss 0.3 1.5 a line regulation ? v out / ( ? v in v out ) 1 v out(t) +0.5v v in 6.0v v ce =v in , i out =30ma 0.01 0.1 %/v input voltage v in 1 6.0 v output voltage temperature characteristics ? v out / ( ? t a v out ) 1 v ce =v in , i out =30ma -40c t a 85c 100 ppm /c power supply rejection ratio psrr 3 v in ={v out(t) +1.0}v dc +0.5vp-pac v ce =v in , i out =30ma, f=1khz 65 db limit current i lim 1 v ce =v in , v in =v out(t) +1.0v 720 950 ma short current i short 1 v ce =v in , short v out to v ss level 450 ma ce high level voltage v ceh 1 1.5 v ce low level voltage v cel 1 0.3 v ce high level current i ceh 1 v ce =v in =6.0v 2.0 a ce low level current i cel 1 v ce =v ss -0.1 0.1 a reverse current i rev 1 v in =0v, v out =6.0v 0.3 a v out pin sink current i revs 1 v in =5.0v, v out =6.0v 0.3 a thermal shutdown detect temperature t tsd 1 junction temperature 150 c thermal shutdown release temperature t tsr 1 junction temperature 125 c
lr1803 preliminary linear integrated circuit unisonic technologies co., ltd 5 of 7 www.unisonic.com.tw qw-r102-081.a ? test circuit circuit 1 ce v in v out v ss c l (ceramic) v a a a v v c in (ceramic) circuit 2 ce v in v out v ss c l (ceramic) a v c in (ceramic)
lr1803 preliminary linear integrated circuit unisonic technologies co., ltd 6 of 7 www.unisonic.com.tw qw-r102-081.a ? test circuit (cont.) circuit 3 ce v in v out v ss c l (ceramic) a v v i out c in : 2.2 f or higher c l : 2.2 f or higher (v out =2.5~5.0v) 4.7 f or higher (v out =2.1~2.45v) 6.8 f or higher (v out =0.8~2.05v)
lr1803 preliminary linear integrated circuit unisonic technologies co., ltd 7 of 7 www.unisonic.com.tw qw-r102-081.a ? typical application circuit v ss ce v in v out c in :2.2 f (ceramic) usb 5v v out sink current (typ: 0.1 a) c l :2.2 f (ceramic) battery v in v out v ss step-up dc/dc converter i out to system lsi utc lr1803 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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