unisonic technologies co., ltd UCM101 preliminary cmos ic www.unisonic.com.tw 1 of 4 copyright ? 2013 unisonic technologies co., ltd qw-r502-933.a bidirectional precision high-side current monitor ? description the utc UCM101 is a bidirectional precision high-side current sense monitor. it uses utc?s advanced technology to provide customers with a minimum operating current, high accuracy, high side voltage and a fixed gain of 10, etc. the utc UCM101 ?s output voltage is proportional to the differential input voltage. direction of current flow is indicated by the flag pin. the utc UCM101 is suitable for widely voltage range applications and portable battery equipment. ? features * low operating current * high side voltage (2.7~20v) * a fixed gain of 10 * high accuracy (typ=1%) sot-25 1 3 5 2 4 ? ordering information ordering number package packing lead free halogen free UCM101l-af5-r UCM101g-af5-r sot-25 tape reel ? marking
UCM101 preliminary cmos ic unisonic technologies co., ltd 2 of 4 www.unisonic.com.tw qw-r502-933.a ? pin configuration gnd s- flag s+ out 1 23 4 5 ? pin description pin no. pin name description 1 flag this is the current direction pin. it is open co llector and allows the logic high level to be set independent of v s+ voltage. low indicates v s+ is greater than v s- 2 gnd ground pin 3 out output voltage pin 4 s+ this is the positive input of the current monitor. it also acts as the supply voltage pin providing current for internal circuitry. the cu rrent through this pin varies with differential sense voltage 5 s- this is the negative input of t he current monitor. the current through this pin varies with differential sense voltage ? block diagram
UCM101 preliminary cmos ic unisonic technologies co., ltd 3 of 4 www.unisonic.com.tw qw-r502-933.a ? absolute maximum rating parameter symbol ratings unit voltage on v s- and v s+ -0.6~20 v voltage on all other pins -0.6~(v s+ or v s- )+0.6 v v sense [(v s+ ) - (v s- )] +/-6 v package power dissipation at t a =25c (de-rate to zero at 150c) p d 300 mw operating temperature t a -40~125 c storage temperature t stg -55~150 c maximum junction temperature t j 150 c note: absolute maximum ratings are those values be yond which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device oper ation is not implied. ? recommended operationg conditions parameter symbol ratings unit common-mode sense input range v s 2.7~20 v current direction flag output flag 0~v s v differential sense input voltage range v sense 0~0.8 v output voltage range v out 0~v s -1.5 v ambient temperature range t a -40~125 c ? electrical characteristics (test conditions t a =25c, v s+ =10v, v sense =100mv) parameter symbol test conditions min typ max unit ground pin current i q 15 35 50 a v s+ input current i s+ v sense =0v 10 17 24 a v s- input current i s- v sense =0v 10 17 24 a output voltage v out v sense =+150mv 1.55 1.5 1.45 v flag high v sense =+100mv 1.02 1 0.98 v v sense =+30mv 309 300 291 mv v sense =0v 0 15 mv flag low v sense =-30mv 285 300 315 mv v sense =-100mv 0.95 1 1.05 v v sense =-150mv 1.42 1.50 1.58 v v out variation with temperature v out tc v sense =100mv 30 ppm/oc v out /v sense gain 10 total output error (gain + offset) accuracy v sense =100mv 2 % v sense =-100mv 5 % bandwidth bw v sense(dc) =100mv v sense ( ac ) =63mv pp 300 khz v s+ common mode rejection ratio cmrr v in =2.7~20v 60 db flag trip point flag tp referred to v sense -2.5 +2.5 mv flag low output voltage v fl i sink =100a 60 200 mv flag high leakage current i fh v oh =5v 1 a
UCM101 preliminary cmos ic unisonic technologies co., ltd 4 of 4 www.unisonic.com.tw qw-r502-933.a ? application information a common application for micro-power current monitors is measuring the discharge cu rrent of a rechargeable lithium ion/polymer battery. the utc UCM101 enables measuring both the charge and discharge current into the battery and with its wide operating voltage of 2.5~20v enab les it to measure the currents in to/ out of up to 4 cells connected in series. when choosing appropriate values for r sense a compromise must be reached between in-line signal loss (including potential power dissipation effects) and small signal accuracy. higher values for r sense gives better accuracy at low load currents by reducing the inaccuracies due to internal offsets. for best operation the utc UCM101 has been designed to operate with v sense of the order of 50mv~150mv. ? typical application circuit v in + r s v in - s+ s- 4 5 1 flag gnd 2 3 out v out utc UCM101 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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