unisonic technologies co., ltd uc8383 cmos ic www.unisonic.com.tw 1 of 10 copyright ? 2010 unisonic technologies co., ltd qw-r502-204.d step-up dc/dc converter ? description the utc uc8383 is a high efficiency vfm controlled step-up dc/dc converter. the utc uc8383 is designed to have low start up voltage and low quiescent current: the utc uc8383 can realize the conversion from t he input voltage to the selected output voltage (2.5v ~ 5.0v) only using an inductor, a diode and an output capacitor. its typical applications include: cellular telephones, pagers, video camera, pda and hand held instruments, palmtop, notebook computer, portable equipment and battery powered equipment. ? features * 0.8v start-up voltage * low supply current of typical be18 a * wide output voltage range of 2.5v~5.0v * output voltage accuracy 2% * output current up to 100ma * low ripple and low noise * high efficiency up to 85% * low profile and minimum external components ? ordering information ordering number pin assignment lead free halogen free package 1 2 3 packing uc8383l-xx-ab3-r UC8383G-XX-AB3-R sot-89 v ss v out l x tape reel uc8383l-xx-ab3-r (1)packing type (2)package type (4)lead free (1) r: tape reel (2) ab3: sot-89 (3) xx: refer to marking information (3)voltage code (4) g: halogen free, l: lead free
uc8383 cmos ic unisonic technologies co., ltd 2 of 10 www.unisonic.com.tw qw-r502-204.d ? marking information package voltage code marking sot-89 25:2.5v 27:2.7v 28:2.8v 30:3.0v 33:3.3v 36:3.6v 50:5.0v 123 uc8383 date code voltage code l: lead free g: halogen free ? pin description pin no pin name description 1 v ss gnd. 2 v out output voltage monitor, ic internal supply voltage 3 l x switch pin
uc8383 cmos ic unisonic technologies co., ltd 3 of 10 www.unisonic.com.tw qw-r502-204.d ? block diagram v ref error amplifier out oscillator vi x limiter v fm control l x
uc8383 cmos ic unisonic technologies co., ltd 4 of 10 www.unisonic.com.tw qw-r502-204.d ? absolute maximum rating parameter symbol ratings unit output voltage v out 5.5 v input voltage v in 5.5 v lx pin voltage v lx 5.5 v lx pin output current i lx internally limited 170 mw power dissipation (ta=25 ) derating rate over ta=25 c p d 1.7 /mw operating junction temperature t j -25 ~ +85 storage temperature t stg -55 ~ +125 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. ? thermal data parameter symbol ratings unit junction to case jc 17 /w ? electrical characteristics (i out = 10ma, ta = 25 , unless otherwise specified.) uc8383-2.5v (v in = 1.5v) parameter symbol test conditions min typ max unit output voltage v out 2.45 2.5 2.55 v start-up voltage (v in -v f ) (note 1) v start i out = 1ma 0.8 1.2 v hold-on voltage v hold i out = 1ma 0.6 v supply current i supply i out = 0 18 a internal switch r ds(on) r lx i lx = 150ma 850 m ? internal leakage current i lx(leak) v lx = 4v, v out = 3v 0.5 a maximum oscillator frequency f osc 120 khz oscillator duty cycle d ty 80 % efficiency i out = 50ma 82 % uc8383-2.7v (v in =1.6v) parameter symbol test conditions min typ max unit output voltage v out 2.646 2.7 2.754 v start-up voltage (v in -v f ) (note) v start i out = 1ma 0.8 1.2 v hold-on voltage v hold i out = 1ma 0.6 v supply current i supply i out = 0 18 a internal switch r ds(on) r lx i lx = 150ma 850 m ? internal leakage current i lx(leak) v lx = 4v, v out = 3.3v 0.5 a maximum oscillator frequency f osc 120 khz oscillator duty cycle d ty 80 % efficiency i out = 50ma 82 % uc8383-2.8v (v in =1.7v) parameter symbol test conditions min typ max unit output voltage v out 2.744 2.8 2.856 v start-up voltage (v in -v f ) (note) v start i out = 1ma 0.8 1.2 v hold-on voltage v hold i out = 1ma 0.6 v supply current i supply i out = 0 18 a internal switch r ds(on) r lx i lx = 150ma 850 m ? internal leakage current i lx(leak) v lx = 4v, v out = 3.3v 0.5 a maximum oscillator frequency f osc 120 khz oscillator duty cycle d ty 80 % efficiency i out = 50ma 82 %
uc8383 cmos ic unisonic technologies co., ltd 5 of 10 www.unisonic.com.tw qw-r502-204.d ? electrical characteristics(cont.) uc8383-3.0v (v in = 1.8v) parameter symbol test conditions min typ max unit output voltage v out 2.94 3 3.06 v start-up voltage (v in -v f ) (note) v start i out = 1ma 0.8 1.2 v hold-on voltage v hold i out = 1ma 0.6 v supply current i supply i out = 0 18 a internal switch r ds(on) r lx i lx = 150ma 850 m ? internal leakage current i lx(leak) v lx = 4v, v out = 3.5v 0.1 0.5 a maximum oscillator frequency f osc 120 khz oscillator duty cycle d ty 80 % efficiency i out = 50ma 82 % uc83830-3.3v (v in = 2v) parameter symbol test conditions min typ max unit output voltage v out 3.234 3.3 3.366 v start-up voltage (v in -v f ) (note) v start i out = 1ma 0.8 1.2 v hold-on voltage v hold i out = 1ma 0.6 v supply current i supply i out = 0 18 a internal switch r ds(on) r lx i lx = 150ma 850 m ? internal leakage current i lx(leak) v lx = 4v, v out = 3.8v 0.5 a maximum oscillator frequency f osc 120 khz oscillator duty cycle d ty 80 % efficiency i out = 50ma 84 % uc83830-3. 6 v (v in = 2v) parameter symbol test conditions min typ max unit output voltage v out 3.528 3.6 3.672 v start-up voltage (v in -v f ) (note) v start i out = 1ma 0.8 1.2 v hold-on voltage v hold i out = 1ma 0.6 v supply current i supply i out = 0 18 a internal switch r ds(on) r lx i lx = 150ma 850 m ? internal leakage current i lx(leak) v lx = 4v, v out = 3.8v 0.5 a maximum oscillator frequency f osc 120 khz oscillator duty cycle d ty 80 % efficiency i out = 50ma 84 % uc83830-5.0v (v in = 3v) parameter symbol test conditions min typ max unit output voltage v out 4.9 5.0 5.1 v start-up voltage (v in -v f ) (note) v start i out = 1ma 0.8 1.2 v hold-on voltage v hold i out = 1ma 0.6 v supply current i supply i out = 0 18 a internal switch r ds(on) r lx i lx = 150ma 700 m ? internal leakage current i lx(leak) v lx = 4v, v out = 5.5v 0.1 0.5 a maximum oscillator frequency f osc 120 khz oscillator duty cycle d ty 80 % efficiency i out = 50ma 85 % note: the minimum value of the device start-up voltage is strictly a function of the forward voltage (v f ) of the diode.
uc8383 cmos ic unisonic technologies co., ltd 6 of 10 www.unisonic.com.tw qw-r502-204.d ? typical application utc uc8383 v ss lx out l c in c out v out v in d application circuit application circuit notes: 1. the inductors: an inductor value of 47h performs well in this application. 2. the diode: an high switching speed and low forward voltage diode. 3. the input capacitor: a val ue of 4.7f tantalum capacitor is enough to guarantee stability. 4. the output capacitor: the best choice for the value of the output capacitance is 47f tantalum capacitor. and the capacitance value should be in the range of about 10f-100f.
uc8383 cmos ic unisonic technologies co., ltd 7 of 10 www.unisonic.com.tw qw-r502-204.d ? typical characteristics
uc8383 cmos ic unisonic technologies co., ltd 8 of 10 www.unisonic.com.tw qw-r502-204.d ? typical characteristics(cont.)
uc8383 cmos ic unisonic technologies co., ltd 9 of 10 www.unisonic.com.tw qw-r502-204.d ? typical characteristics(cont.) output waveform of lx output waveform of lx upper trace: output voltage, 1v/division lower trace: lx mode voltage, 1v/division upper trace: output voltage, 1v/division lower trace: lx mode voltage, 1v/division output waveform of lx output waveform of lx upper trace: output voltage, 1v/division lower trace: lx mode voltage, 1v/division upper trace: output voltage, 1v/division lower trace: lx mode voltage, 1v/division output waveform of lx output waveform of lx under maximum frequency upper trace: output voltage, 1v/division lower trace: lx mode voltage, 1v/division upper trace: output voltage, 1v/division lower trace: lx mode voltage, 1v/division v in =2.5v, i load =1ma, v out =3.6v v in =2.5v, i load =10ma, v out =3.6v v in =2.5v, i load =50ma, v out =3.6v v in =2.5v, i load =100ma, v out =3.6v v out =3.6v, f ocs 1=112.8khz, dty:82.5% v in =2.5v, i load =200ma, v out =3.6v
uc8383 cmos ic unisonic technologies co., ltd 10 of 10 www.unisonic.com.tw qw-r502-204.d 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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