unisonic technologies co., ltd l5030 linear integrated circuit www.unisonic.com.tw 1 of 6 copyright ? 2015 unisonic technologies co., ltd qw-r125-001.f boost-up voltage converter for led driver ? description the l5030 is a high efficiency boost converter operating in current loop, based on a pfm mode to drive leds. the current mode regulation allows the uniform brightness of leds. the wide application of l5030 makes it suitable for many types of battery applications such as li-ions, alkaline, or sealed lead acid battery. the combination of few external components and small package size keeps the converter board area to a minimum in space-restricted applications. ? features * inductor based converter brings up to 92% efficiency * +0.8v to +6.0v input voltage range * 0.92v guaranteed start up input voltage * boost up control using pfm * constant output current regulation ? ordering information ordering number package packing l5030g-af5-r sot-25 tape reel ? marking 54 3 e0c0g 2 1
l5030 linear integrated circuit unisonic technologies co., ltd 2 of 6 www.unisonic.com.tw qw-r125-001.f ? pin descriptions pin no. symbol i/o description 1 v cc supply voltage 2 gnd ground 3 nc no connection 4 i sense i current sense input 5 v drive o output drive for external switching tran sistor. connected to the base of external switching transistor. ? block diagram driver i sense + - s r 19mv v ref oscillator v drive q on/off time control
l5030 linear integrated circuit unisonic technologies co., ltd 3 of 6 www.unisonic.com.tw qw-r125-001.f ? device description the utc l5030 is designed to supply a constant current to the external load, the circuit be powered a battery supply. an external transistor is required for led application. the utc l5030 guarantees the start up voltage as low as 0.92v and remains operation down to 0.8v. the basic structure of utc l5030 is a step-up dc/dc converter. it offe rs a pulse frequency modulation (pfm) operation, which controls the constant off time (1.7 s typically) for external transistor at the 200khz maximum frequency. the external switching transistor is on and kept on unt il the voltage across the current-sense resistor which is connected in series with the emitter of the switching transistor exceeds the i sense input threshold (19mv). the transistor is shut off and the energy st ored in inductor is discharged when i sense input threshold exceeds 19mv. once the discharge cycle is completed, the external trans istor is on again. this charging and discharging sequence will repeat and trigger the external transis tor regardless the inductor current value.
l5030 linear integrated circuit unisonic technologies co., ltd 4 of 6 www.unisonic.com.tw qw-r125-001.f ? absolute maximum ratings (t a = 25c, unless otherwise specified) parameter symbol ratings unit supply voltage v cc -0.3 ~ 10 v input voltage -0.3 ~ v cc +0.3 v power dissipation p d 450 mw operating 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 (v cc =1.5v) parameter symbol test conditions min typ max units dc parameters (t a =25c, unless otherwise specified.) recommended supply voltage v cc 0.8 6 v minimum startup voltage v su ( min ) i drive =-600 a, v drive =0.7v 0.8 0.92 v drive voltage high v vdrive v isense = 0v, i vdrive =-0.5ma v cc -0.3 v cc v low v isense = 50mv, i vdrive = 5ma 0 0.25 v i sense threshold voltage v isense 14 19 24 mv efficiency(note 1) 88 92 % quiescent current(note 2) i q 0.2 ma v drive output current i vdrive v drive = 0.7v, v isense = 0v 1.5 3.6 ma supply current(note 3) i cc v drive = 0.7v, v isense =0v 2 4 ma i sense voltage temp co.(note 2) t cvisense 0.4 %/c i sense input current i isense v isense = 0v 0 -30 -65 a ac parameters (note 2) (t a = 0 ~ 70c, unless otherwise specified) discharge pulse width t drv 1.2 1.7 3.2 s pfm operating frequency (note 4) f osc 350 khz notes: 1. the application dependent, please see reference designs. 2. these parameters are guaranteed by design. 3. see typical characteristics. the total supply current =i q + i vdrive , 4. see applications section. operating fr equency is application circuit dependent.
l5030 linear integrated circuit unisonic technologies co., ltd 5 of 6 www.unisonic.com.tw qw-r125-001.f ? typical application circuits the utc l5030 provides portable and multiple leds applications. solution for portable application efficiency (%) solution for multiple leds application efficiency (%)
l5030 linear integrated circuit unisonic technologies co., ltd 6 of 6 www.unisonic.com.tw qw-r125-001.f ? typical characteristics 100 8 5 1 300 2 quiescent current vs. input voltage quiescent current (a) 7 4 200 input voltage (v) 6 3 0 1m 8 5 1 4m 2 drive current vs. input voltage drivecurrent (a) 7 4 3m input voltage (v) 6 3 0 2m sense voltage (v) efficiency (%) 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 writ ten 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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