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unisonic technologies co., ltd uc3500 cmos ic high efficiency vfm controlled step-up dc/dc converter ? description the utc uc3500 step-up dc/dc converters are optimized for applications that prioritize high efficiency and high frequency. the efficiency is greatly improved by utilizing an internal vfm controlled scheme that switches with fixed frequency and is adjustable up to more than 150 khz depending on the load. the utc uc3500 requires only three external components to realize the conversion from t he battery voltage to the selected output voltage in the r ange of 2.5v ~ 5.5v. the start-up voltage of utc uc3500 is guaranteed at 0.8v and the device is operating down to 0.5v. the output current is guaranteed up to 150ma, while qui escent current is only 18 a. ? features * 0.8v start-up voltage * 0.5v hold-on voltage * output current up to 150ma * low supply current of 18 a * wide output voltage range of 2.5v~5.5v * output voltage accuracy 2% * high efficiency up to 88% * low profile and minimum external components ? ordering information ordering number lead free halogen free package packing uc3500l-xx-ab3-r UC3500G-XX-AB3-R sot-89 tape reel uc3500l-xx-ae3-r uc3500g-xx-ae3-r sot-23 tape reel uc3500l-xx-af5-r uc3500g-xx-af5-r sot-25 tape reel www.unisonic.com.tw 1 of 12 copyright ? 2009 unisonic technologies co., ltd qw-r502-072,d
uc3500 cmos ic ? marking information package voltage code marking sot-25 321 u3xx 54 voltage code l: lead free g: halogen free sot-23 3 u3xx 12 voltage code l: lead free g: halogen free sot-89 25:2.5v 27:2.7v 28:2.8v 30:3.0v 33:3.3v 36:3.6v 40:4.0v 50:5.0v 123 xx uc3500 date code voltage code l: lead free g: halogen free ? pin configuration sot-25 sot-23 sot-89 unisonic technologies co., ltd 2 of 12 www.unisonic.com.tw qw-r502-072.d
uc3500 cmos ic ? block diagram vref error amplifier out oscillator vi x limiter vfm control lx gnd out unisonic technologies co., ltd 3 of 12 www.unisonic.com.tw qw-r502-072.d
uc3500 cmos ic unisonic technologies co., ltd 4 of 12 www.unisonic.com.tw qw-r502-072.d ? absolute maximum rating parameter symbol ratings unit output voltage v out 7 v input voltage v in 7 v lx pin voltage v lx 7 v lx pin output current i lx internally limited power dissipation at 25 160 mw derating rate ta > 25 sot-23/sot-25 p d 1.6 /mw operating junction temperature t opr -25 ~ +85 storage temperature t stg -65 ~ +150 note: absolute maximum ratings are those values beyond which the device coul d be permanently damaged. absolute maximum ratings are stress ratings only and functional device oper ation is not implied. ? electrical characteristics (ta = 25 , unless otherwise specified.) uc3500-2.5v (v in = 1.4v) parameter symbol test conditions min typ max unit output voltage v out i out = 10ma 2.4 2.5 2.6 v i out = 0 0.7 1.1 v start-up voltage (v in -v f ) (note) v start i out = 1ma 0.8 1.2 v i out = 0 0.4 0.6 v hold-on voltage v hold i out = 1ma 0.3 0.5 v supply current i supply i out = 0 18 a internal switch r ds(on) r lx i lx = 100ma 760 m ? internal leakage current i lx(leak) v lx = 4v, v out = 2.8v 0.1 0.3 a maximum oscillator frequency f osc i out = 10ma 150 khz oscillator duty cycle d ty i out = 10ma 75 % i out = 10ma 81 % i out = 50ma 83 % efficiency i out = 100ma 82 % uc3500-2.7v (v in = 1.6v) parameter symbol test conditions min typ max unit output voltage v out i out = 10ma 2.6 2.7 2.8 v i out = 0 0.7 1.1 v start-up voltage (v in -v f ) (note) v start i out = 1ma 0.8 1.2 v i out = 0 0.4 0.6 v hold-on voltage v hold i out = 1ma 0.3 0.5 v supply current i supply i out = 0 18 a internal switch r ds(on) r lx i lx = 100ma 760 m ? internal leakage current i lx(leak) v lx = 4v, v out = 3.0v 0.1 0.3 a maximum oscillator frequency f osc i out = 10ma 150 khz oscillator duty cycle d ty i out = 10ma 75 % i out = 10ma 82 % i out = 50ma 83 % efficiency i out = 100ma 82 %
uc3500 cmos ic unisonic technologies co., ltd 5 of 12 www.unisonic.com.tw qw-r502-072.d ? electrical characteristics(cont.) uc3500-2.8v (v in = 1.7v) parameter symbol test conditions min typ max unit output voltage v out i out = 10ma 2.7 2.8 2.9 v i out = 0 0.7 1.1 v start-up voltage (v in -v f ) (note) v start i out = 1ma 0.8 1.2 v i out = 0 0.4 0.6 v hold-on voltage v hold i out = 1ma 0.3 0.5 v supply current i supply i out = 0 18 a internal switch r ds(on) r lx i lx = 100ma 760 m ? internal leakage current i lx(leak) v lx = 4v, v out = 3.1v 0.1 0.3 a maximum oscillator frequency f osc i out = 10ma 150 khz oscillator duty cycle d ty i out = 10ma 75 % i out = 10ma 82 % i out = 50ma 83 % efficiency i out = 100ma 82 % uc3500-3.0v (v in = 1.8v) parameter symbol test conditions min typ max unit output voltage v out i out = 10ma 2.9 3 3.1 v i out = 0 0.7 1.1 v start-up voltage (v in -v f ) (note) v start i out = 1ma 0.8 1.2 v i out = 0 0.4 0.6 v hold-on voltage v hold i out = 1ma 0.3 0.5 v supply current i supply i out = 0 18 a internal switch r ds(on) r lx i lx = 100ma 750 m ? internal leakage current i lx(leak) v lx = 4v, v out = 3.3v 0.1 0.3 a maximum oscillator frequency f osc i out = 10ma 150 khz oscillator duty cycle d ty i out = 10ma 75 % i out = 10ma 82 % i out = 50ma 84 % efficiency i out = 100ma 82 % uc3500-3.3v (v in = 2.0v) parameter symbol test conditions min typ max unit output voltage v out i out = 10ma 3.2 3.3 3.4 v i out = 0 0.7 1.1 v start-up voltage (v in -v f ) (note) v start i out = 1ma 0.8 1.2 v i out = 0 0.4 0.6 v hold-on voltage v hold i out = 1ma 0.3 0.5 v supply current i supply i out = 0 18 a internal switch r ds(on) r lx i lx = 100ma 750 m ? internal leakage current i lx(leak) v lx = 4v, v out = 3.6v 0.1 0.3 a maximum oscillator frequency f osc i out = 10ma 150 khz oscillator duty cycle d ty i out = 10ma 75 % i out = 10ma 83 % i out = 50ma 85 % efficiency i out = 100ma 84 %
uc3500 cmos ic unisonic technologies co., ltd 6 of 12 www.unisonic.com.tw qw-r502-072.d ? electrical characteristics(cont.) uc3500-3.6v (v in =2.2v) parameter symbol test conditions min typ max unit output voltage v out i out = 10ma 3.49 3.6 3.71 v i out = 0 0.7 1.1 v start-up voltage (v in -v f ) (note) v start i out = 1ma 0.8 1.2 v i out = 0 0.4 0.6 v hold-on voltage v hold i out = 1ma 0.3 0.5 v supply current i supply i out = 0 18 a internal switch r ds(on) r lx i lx = 100ma 750 m ? internal leakage current i lx(leak) v lx = 4v, v out = 3.9v 0.1 0.3 a maximum oscillator frequency f osc i out = 10ma 150 khz oscillator duty cycle d ty i out = 10ma 75 % i out = 10ma 84 % i out = 50ma 86 % efficiency i out = 100ma 85 % uc3500-4.0v (v in =2.4v) parameter symbol test conditions min typ max unit output voltage v out i out = 10ma 3.88 4.0 4.12 v i out = 0 0.7 1.1 v start-up voltage (v in -v f ) (note) v start i out = 1ma 0.8 1.2 v i out = 0 0.4 0.6 v hold-on voltage v hold i out = 1ma 0.3 0.5 v supply current i supply i out = 0 19 a internal switch r ds(on) r lx i lx = 100ma 740 m ? internal leakage current i lx(leak) v lx = 4v, v out = 4.3v 0.1 0.3 a maximum oscillator frequency f osc i out = 10ma 150 khz oscillator duty cycle d ty i out = 10ma 75 % i out = 10ma 85 % i out = 50ma 87 % efficiency i out = 100ma 85 % uc3500-5.0v (v in = 3.0v) parameter symbol test conditions min typ max unit output voltage v out i out = 10ma 4.85 5.0 5.15 v i out = 0 0.7 1.1 v start-up voltage (v in -v f ) (note) v start i out = 1ma 0.8 1.2 v i out = 0 0.4 0.6 v hold-on voltage v hold i out = 1ma 0.3 0.5 v supply current i supply i out = 0 19 a internal switch r ds(on) r lx i lx = 100ma 730 m ? internal leakage current i lx(leak) v lx = 4v, v out = 5.3v 0.1 0.3 a maximum oscillator frequency f osc i out = 10ma 150 khz oscillator duty cycle d ty i out = 10ma 75 % i out = 10ma 86 % i out = 50ma 88 % efficiency i out = 100ma 85 % note: v f references to the forward voltage of the diode.
uc3500 cmos ic unisonic technologies co., ltd 7 of 12 www.unisonic.com.tw qw-r502-072.d ? principle of operation the utc uc3500 consists of a band-gap reference voltage sour ce, error amplifier, vfm control logic core, oscillator, v lx limiter amplifier, n-channel mosfet switchin g transistor and output voltage divider network. the device compares the band-gap reference voltage with the feedback voltage from the output through divider network. in t on phase, the energy is transferred from the battery to the inductor. the switch is turned off after a maximum on time set to 2.5s. in t off phase, the energy stored in the inducto r is transferred to the load. this process is continuously performed to ensure stable outpu t voltage. until the output voltage reaches the expected value. therefore, in case of light load, the device works in pfm mode. in heavy load condition, the device works in continuous mode, the frequency range up to a maximum 150 kh z set by the built in oscillator. in over current conditions, the ton time is shorted; the swit ching frequency will be higher than 150 khz.
uc3500 cmos ic ? typical application circuit ? reconmmended components l d c in c out 47 h (sunida cd54 fosc 500khz) ma737, or mbrm110l 10v 4.7 f (tantalum) 16v 47 f (tantalum) unisonic technologies co., ltd 8 of 12 www.unisonic.com.tw qw-r502-072.d
uc3500 cmos ic ? typical characteristics uc3500-2.5v time(ms) output waveform of lx 0 1 1 time(s) 0 200 50 100 150 250 25 225 75 125 175 2 2 4 3 0 -50 0 50 i out =1ma 3 output waveform of lx 0 1 1 0 200 50 100 150 250 25 225 75 125 175 2 2 4 3 0 -50 0 50 i out =10ma 3 output waveform of lx under maximum frenquency 0 time(s) 0 20 5 10 15 25 1 3 2 -1 f ocs =166khz, dty:83% 4 unisonic technologies co., ltd 9 of 12 www.unisonic.com.tw qw-r502-072.d
uc3500 cmos ic ? typical characteristics(cont.) uc3500-2.7v time(ms) output waveform of lx 0 1 1 time(s) 0 200 50 100 150 250 25 225 75 125 175 2 2 4 3 0 -50 0 50 i out =1ma 3 output waveform of lx 0 1 1 0 200 50 100 150 250 25 225 75 125 175 2 2 4 3 0 -50 0 50 i out =10ma 3 output waveform of lx under maximum frenquency 0 time(s) 0 20 5 10 15 25 1 3 2 -1 f ocs =166khz, dty:83% 4 unisonic technologies co., ltd 10 of 12 www.unisonic.com.tw qw-r502-072.d
uc3500 cmos ic ? typical characteristics(cont.) uc3500-3.3v time(ms) output waveform of lx 0 1 1 time(s) 0 200 50 100 150 250 25 225 75 125 175 2 2 4 3 0 -50 0 50 i out =1ma 3 output waveform of lx 0 1 1 02 50 100 150 250 25 225 75 125 175 2 0 0 2 4 3 0 -50 0 50 i out =10ma 3 unisonic technologies co., ltd 11 of 12 www.unisonic.com.tw qw-r502-072.d output waveform of lx(v)
uc3500 cmos ic unisonic technologies co., ltd 12 of 12 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. www.unisonic.com.tw qw-r502-072.d

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