unisonic technologies co., ltd um5237 preliminary linear integrated circuit www.unisonic.com.tw 1 of 6 copyright ? 2013 unisonic technologies co., ltd qw-r101-040.c 3-terminal adjustable regulator ? description the utc um5237 is a 3-terminal adjustable regulator. it?s used as a variable output voltage regulator. the utc um5237 has a less power dissipation and more exact loading voltage regulation .it?s suitable for driver circuit, differential amplifier and referenc e voltage generator circuit, etc. ? features * wide input/output voltage range * low dropout voltage * over current protect * external circuit can adjust the output voltage sot-89 1 ? ordering information ordering number package pin assignment packing lead free halogen free 1 2 3 um5237l-ab3-r UM5237G-AB3-R sot-89 o g i tape reel note: pin assignment: o: output g: ground i: input UM5237G-AB3-R (1)packing type (2)package type (1) r: tape reel (2) ab3: sot-89 (3) g: halogen free, l: lead free (3)halogen free ? marking information
um5237 preliminary linear integrated circuit unisonic technologies co., ltd 2 of 6 www.unisonic.com.tw qw-r101-040.c ? block diagram
um5237 preliminary linear integrated circuit unisonic technologies co., ltd 3 of 6 www.unisonic.com.tw qw-r101-040.c ? absolute maximum rating (t a =25c, unless otherwise noted) parameter symbol ratings unit input voltage v in 30 v drive current i d 30 ma input/output voltage difference v in -v out 28 v internal power dissipation p d 500 mw operating temperature t opr -20~+75 c storage temperature t stg -55~+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. ? recommended operating conditions parameter symbol ratings unit supply voltage range v in 3.5~30 v output voltage range v out 1.5~25 v ? electrical characteristics test circuit (a) is used with t a =25c, v i =15v, v o =12v, i l =200ma, c ref =1 a, r 1 =4.3k ? parameter symbol test conditions min typ max unit input voltage v in between pin 1 and pin 2 3.5 30 v output voltage v out r 2 0.82~108k ? 1.5 28 v minimum input/output voltage difference v in -v out 0.2 v reference voltage v ref between pin 2 and pin 3 1.2 1.26 1.32 v input voltage regulation r e g -in v i =15~20v 0.02 0.1 %/v loading voltage regulation r e g -l i l =10~200ma 0.02 0.1 % bias current i b i l =0 (disregarding the current in resistors r 1 , r 2 ) 1.7 3.0 ma output voltage thermal coefficient tc vo t a =0~75c 0.02 %/c ripple rejection rr f=120hz measured with circuit (b) 68 db output noise voltage v no f=20hz~100khz 25 vrms
um5237 preliminary linear integrated circuit unisonic technologies co., ltd 4 of 6 www.unisonic.com.tw qw-r101-040.c ? test circuit (a) standard test circuit v o =v ref 22 1 rr 11.261(v) r4.3 ?? ?? ???? ?? ?? ?? ?? ?? r 2 =r 1 oo ref vv 14.3 1(k ? ) v1.26 ?? ?? ?? ? ? ?? ?? ?? ?? ?? (r 1 =4.3k ? , v rer 1.26v) (b) ripple rejection test circuit f=120hz, e i =0.1vrms + vv + 1 utc um5237 3 + 2sb1314 v i c 0.33f r 1 4.3k c ref c 47 r l i l c 2 e o rr=20 log (db) e i e o 220 r 2
um5237 preliminary linear integrated circuit unisonic technologies co., ltd 5 of 6 www.unisonic.com.tw qw-r101-040.c ? typical application circuit 1. standard application circuit 220 0.33f + 4.3k r 2 36.6k 1000pf 100f r i 2sb1314 v i =12.2v v o =12v r 1 c ref 3 1 2 v o =v ref v r r 1 1 2 ? ? ? ? ? ? ? ? ? ? , v ref =1.26v 2. maximum drive current controller application circuit 220 0.33f + 4.3k r 2 36.6k 1000pf 100f r i 2sb1314 v i =12.2v v o =12v r 1 c ref 3 1 2 r in 470 3. output voltage on/off controller set control circuit resistor r so that voltage of point a is more than 1.5v and less than 5v
um5237 preliminary linear integrated circuit unisonic technologies co., ltd 6 of 6 www.unisonic.com.tw qw-r101-040.c 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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