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1/14 500ma s y nchr onous ste p -down dc/dc converters me3101 series ver04 500ma synchr onous s tep-down dc/dc converters me3101 series description me3101 series is a gr ou p of synchronous rectification type dc/dc converters with a built-in 0.6 ? p-channel driver transistor and 0.7 ? n-channel switching transistor, designed to allow the use of ceramic capacitors. the ics enable a high efficiency, st able power supply with an output current of 500ma to be configured using only a coil and two capacitors connected externally. with the built-in oscillator, oscillation frequency is 1.2mhz.as for operation mode, the me3101 series can be manually switched with automatic pwm/pfm switching control mode, allowing fast response, low ripple and high efficiency over the full range of load (from light load to high output current conditions). during standby, all circuits are shutdown to reduce current consumption to as low as 1.0 a or less. feature z sy nchron ous step-d own dc/dc z high efficiency :93%(typ) z low ripple voltage :10mv z output current :500ma z oscillation frequency :1.2mhz z pwm/pfm automatic switching control z maximum duty ratio :100% z ceramic capacitor compatible z ultra small packag es :sot-23-5l z soft-start ciruit built-in ty pical application: z mobile phon es (pdc, gsm, cdma, imt200 etc.) z bluetooth equipment z pda z portable communication modem z portable games z cameras z digital cameras z cordless phones z notebook computers ty pical application circuit ty pical performan ce characteristics efficiency vs . output current l=3.3uh cin 4.7uf cl=10uf topr 25 -100 0 100 200 300 400 500 600 700 0.50 0.55 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 effici envy (%) iou t (ma) vin= 4v vin= 4.5v vin =5v vin =6v v?mw`r?y?b? www.gofotech.com
500m a s y nchronous ste p -down dc/dc converters me3101 series ver04 pin configuration pin infor m ation me3101axx pin number pin name function 1 vin power input 2 v ss g r ound 3 ce/mode chip enable / mode switch 4 vout output voltage sence 5 lx switching output me3101axx-ds pin number pin name function 1 ce/mode chip enable / mode switch 2 vss ground 3 lx switching output 4 vin power input 5 vout output voltage sence 2/14 n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
500m a s y nchronous ste p -down dc/dc converters me3101 series ver04 block diagram absolute maximum rang parameter symbol ratings units vin pin vo ltag e vin -0.3 6.5 v lx pin vol t age vlx -0.3 v i n+0 . 3 v vout pin voltage vout -0.3 6.5 v ce / mode pin voltage vce -0.3 vin+0. 3 v lx pin current ilx 1000 ma power dissipation(sot-23 - 5l) pd 250 m w operating temperature range t opr -25~+85 storage temperature range t stg -40~+125 3/14 n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
500m a s y nchronous ste p -down dc/dc converters me3101 series ver04 electrical characteristics me3101a10 ( unl e ss otherwise stated ,vin=3.0v fosc=1.2mhz, cin=4.7uf cl 10uf l 3.3uh ta=25 ) parameter symbol conditions min. typ. max. unit circuit output voltage vout vce vin , iout 30ma 0.98 1.0 1.02 v operating voltage range vin 2 6 v m a x i mu m o u t p u t current iout.max 500 ma u.v.l.o . volt age v uvl o vce vin , vou t 0v , lx voltage which lx pin voltage holding "l" level 1.2 v supp ly curre nt idd vin vce 3.0 v v out vout1.1 55 ua stand-by current istb vin 3.0v vce 0v v out vout1.1 0 1 ua frequency fosc iout 100ma 1020 1200 1380 k h z pfm switch current ipf m vce vin iout 1ma 18 0 ma m a x i mu m d u t y rati o maxdty vce vin vout 0 100 minimum duty rati o mindty vce vout vin 0 efficiency effi vce vin 2.5v iout 100ma 90 lx sw ?h? on resistance rlxh vce 0.5vin vce 0v ilx 1 00m a 0.5 1.2 ? lx sw ?l? on resistance rlxl vce 0.5vin ilx 100ma 0.6 1.4 ? lx sw ? h ? leak current ileakh vin vo ut 5.0v vce 0v lx 0v 0.01 1 ua lx sw ?l? leak current ileakl vin vout 5.0v vce 0v lx 5v 0.01 1 ua current limit ilim vin vce 5.0v vout 0v 80 0 ma output voltage temperature charac terist ics vout/ (vout* S topr) iout=30ma,-40 topr 85 + 100 ppm/ ce ?h? voltage vceh vout 0v 0.7 vin v ce ?l? voltage vcel vout 0v vss 0.6 v ce ?h? current iceh vin vce 5.5v vout 0v -0.1 0.1 ua ce ?l? current icel vin 5.5v vce 0v v out 0v -0.1 0.1 ua soft-start time tss vce 0v vin iout 1ma 0.5 1.2 3.0 m s ec latch time tlat vin vce 5.0v 1 20 ms ec 4/14 n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
500m a s y nchronous ste p -down dc/dc converters me3101 series ver04 me3101a12 ( unless otherwise stated ,vin=3.0v fosc=1.2mhz, cin=4.7uf cl 10uf l 3.3uh ta=25 ) parameter symbol conditions min. typ. max. unit circuit output voltage vout vce vin , iout 30ma 1.176 1.2 1.224 v operating voltage range vin 2 6 v maximum outp u t current iout.max vin=2.5v 500 ma u.v.l.o . voltage vuvlo vce vin,vout 0v , lx voltage which lx pin voltage holding "l" level 1 1.4 1.78 v supply current idd vin vce 3.0v v out vout1.1 60 120 ua stand-by current istb vin 3.0v vce 0v v out vout1.1 0 1 ua frequency fosc iout 10 0ma 1020 1200 1380 k h z pfm switch current ipf m vce vin i out 1m a 10 0 14 0 180 ma maximum duty rati o maxdty vce vin vout 0 100 minimum duty rati o mindty vce vout vin 0 efficiency effi vce vin 2.5v iout 100ma 90 lx sw ?h? on resistance rlxh vce 0.5vin vce 0v ilx 1 00m a 0.5 1.2 ? lx sw ?l? on resistance rlxl vce 0.5vin ilx 100ma 0.6 1.4 ? lx sw ?h? leak current ileakh vin vout 5.0v vce 0v lx 0v 0.01 1 ua lx sw ?l? leak current ileakl vin vout 5.0v vce 0v lx 5v 0.01 1 ua current limit ilim vin vce 5.0v vout 0v 60 0 70 0 ma output voltage temperature charac terist ics vout/ (vout* S topr) iout=30ma,-40 topr 85 + 100 ppm/ ce ?h? voltage vceh vout 0v 0.9 vin v ce ?l? voltage vcel vout 0v vss 0.3 v ce ?h? current iceh vin vce 5.5v vout 0v -0.1 0.1 ua ce ?l? current icel vin 5.5v vce 0v v out 0v -0.1 0.1 ua soft-start time tss vce 0v vin iout 1ma 0.5 1.0 3.0 m s ec latch time tlat vin vce 5.0v 1 20 ms ec 5/14 n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
500m a s y nchronous ste p -down dc/dc converters me3101 series ver04 ME3101A18 ( unless otherwise stated ,vin=3.6v fosc=1.2mhz, cin=4.7uf cl 10uf l 3.3uh ta=25 ) parameter symbol conditions min. typ. max. unit circuit output voltage vout vce vin , iout 30ma 1.764 1.8 1.836 v operating voltage range vin 2 6 v maximum output current iout.m ax v in=3.0v 500 ma u.v.l.o . voltage vuvlo vce vin,vout 0v , lx voltage which lx pin voltage holding "l" level 1 1.4 1.78 v supply current idd vin vce 3.6v v out vout1.1 60 120 ua stand-by current istb vin 3.6v vce 0v v out vout1.1 0 1 ua frequency fosc iout 10 0ma 1020 1200 1380 k h z pfm switch current ipf m vce vin iout 1ma 100 14 0 180 ma maximum duty rati o maxdty vce vin vout 0 100 minimum duty rati o mindty vce vout vin 0 efficiency effi vce vin 3.0 v iout 100ma 90 lx sw ?h? on resistance rlxh vce 0.5vin vce 0v ilx 1 00m a 0.5 1.2 ? lx sw ?l? on resistance rlxl vce 0.5vin ilx 100ma 0.6 1.4 ? lx sw ?h? leak current ileakh vin vout 5.0v vce 0v lx 0v 0.01 1 ua lx sw ?l? leak current ileakl vin vout 5.0v vce 0v lx 5v 0.01 1 ua current limit ilim vin vce 5.0v vout 0v 60 0 70 0 ma output voltage temperature charac terist ics vout/ (vout* S topr) iout=30ma,-40 topr 85 + 100 ppm/ ce ?h? voltage vceh vout 0v 0.9 vin v ce ? l ? volt a g e vcel v out 0v vss 0.3 v ce ?h? current iceh vin vce 5.5v vout 0v -0.1 0.1 ua ce ?l? current icel vin 5.5v vce 0v v out 0v -0.1 0.1 ua soft-start time tss vce 0v vin iout 1ma 0.5 1.0 3.0 m s ec latch time tlat vin vce 5.0v 1 20 ms ec 6/14 n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
500m a s y nchronous ste p -down dc/dc converters me3101 series ver04 me3101a33 ( unless otherwise stated ,vin=5v fosc=1.2mhz, cin=4.7uf cl 10uf l 3.3uh ta=25 ) parameter symbol conditions min. typ. max. unit circuit output voltage vout vce vin , iout 30ma 3.234 3.3 3.366 v operating voltage range vin 2 6 v maximum output current iout.m ax v in=4.5v 500 ma u.v.l.o . voltage vuvlo vce vin,vout 0v , lx voltage which lx pin voltage holding "l" level 1 1.4 1.78 v supply current idd vin vce 5v vout vou t1.1 60 120 ua stand-by current istb vin 5v vce 0v v out vout1.1 0 1 ua frequency fosc iout 10 0ma 1020 1200 1380 k h z pfm switch current ipf m vce vin iout 1ma 100 14 0 180 ma maximum duty rati o maxdty vce vin vout 0 100 minimum duty rati o mindty vce vout vin 0 efficiency effi vce vin 4.5 v iout 100ma 93 lx sw ?h? on resistance rlxh vce 0.5vin vce 0v ilx 1 00m a 0.5 1.2 ? lx sw ?l? on resistance rlxl vce 0.5vin ilx 100ma 0.6 1.4 ? lx sw ?h? leak current ileakh vin vout 5.0v vce 0v lx 0v 0.01 1 ua lx sw ?l? leak current ileakl vin vout 5.0v vce 0v lx 5v 0.01 1 ua current limit ilim vin vce 5.0v vout 0v 60 0 70 0 ma output voltage temperature charac terist ics vout/ (vout* S topr) iout=30ma,-40 topr 85 100 ppm/ ce ?h? voltage vceh vout 0v 1.1 vin v ce ? l ? volt a g e vcel v out 0v vss 0.3 v ce ?h? current iceh vin vce 5.5v vout 0v -0.1 0.1 ua ce ?l? current icel vin 5.5v vce 0v v out 0v -0.1 0.1 ua soft-start time tss vce 0v vin iout 1ma 0.5 1.0 3.0 m s ec latch time tlat vin vce 5.0v 1 20 ms ec 7/14 n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
500m a s y nchronous ste p -down dc/dc converters me3101 series ver04 note on use 1. use ceram i c capa cit o r wil l achie ve l o w ripple and high efficiency. 2. when the difference between vin and vout is large in pwm co ntro l, very narrow pulses will be outputted, and there is the possibility that some cycles may be skipped completely. 3. when the difference between vin and vout is small, and the lo ad current is heavy, very wide pulses will be outputted and there is the possibility that some cy cles may be skipped completely: in this case, the lx pin may not go low at all. 4. with the ic, the peak current of the coil is controlled by th e current limit circuit. since th e peak current increases when dropout voltage or load current is high, current limit starts operating, and this can lead to instability. when peak current becomes high, please adjust the coil inductance value and fully check the circuit operation. in addition, please calculate the peak current according to the following formula: ipk = (vin-vout) * on duty / (2* l* fosc) + iout l: coil inductance value fosc: oscillation frequency 5. when vin is less than 2.4v, limit current may not be reached because voltage falls caused by on resistance. 6. care must be taken when laying out the pc board, in order to prevent misoperation of the current limit mode. depending on the state of the pc board, latch time may become longer and latch operation may not work. in order to avoid the effect of noise, the board should be laid out so that cap acitors are placed as close to the chip as possible. 7. use of the ic at voltages below the recommended voltage range may lead to instability. 8. when the ic is used in high temperature, output voltage may increase up to input voltage level at no load because of the leak current of the driver transistor. 8/14 n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
500m a s y nchronous ste p -down dc/dc converters me3101 series ver04 typical performance characteristics (1) efficiency vs. output current -100 0 100 200 300 400 500 600 700 0.50 0.55 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 efficienvy (%) iout (ma) vin=4v vin=4.5v vin=5v vin=6v -100 0 100 200 300 400 500 600 700 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.00 efficiency (%) iout (ma) vin=5v,vout=3.3v l=3.3uh,cin=4.7uf,cout=10u f l=4.7uh,cin=4.7uf,cout=10u f l=4.7uh,cin=2.2uf,cout=10u f l=4.7uh,cin=1uf,cout=10uf -100 0 100 200 300 400 500 600 700 0. 60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.00 efficiency (%) iout (ma) vin=6v,vout=3.3v l=3.3uh,cin=4.7uf,cout=10uf l=4.7uh,cin=4.7uf,cout=10uf l=4.7uh,cin=2.2uf,cout=10uf l=4.7uh,cin=1uf,cout=10uf (2) output voltage vs. output current (3) input current vs. output current -100 0 100 200 30 0 400 500 600 700 3.00 3.05 3.10 3.15 3.20 3.25 3.30 3.35 3.40 3.45 3.50 output voltage (v) iout (ma) vin=4v vin=4.5v vin=5v vin=6v -100 0 100 200 300 400 500 600 700 0 100 200 300 400 500 600 700 800 input current (ma) iout (ma) vin=4v vin=4.5v vin=5v vin=6v 9/14 n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
500m a s y nchronous ste p -down dc/dc converters me3101 series ver04 (4) linear transient response time r=33 ? ,iout=100ma vin=0~5v r=11 ? ,iout=300ma vin=0~5v r=6 , iout=5 50ma vin=0~5v (5) load response vin=5v,io u t=0~100ma vin=5v,iout=100~0ma 10/14 n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
500m a s y nchronous ste p -down dc/dc converters me3101 series ver04 vin=5v,iout=0~300ma vin=5v,iout=300~0ma vin=5v,io u t=0~550ma vin=5v,iout=550~0ma 11/14 n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
500m a s y nchronous ste p -down dc/dc converters me3101 series ver04 test circuit 12/14 n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
500m a s y nchronous ste p -down dc/dc converters me3101 series ver04 package information sot-23-5l 13/14 n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
500m a s y nchronous ste p -down dc/dc converters me3101 series ver04 the information described herein is subject to change without notice. nanjing micr o one electronics inc is not responsible for any problems caused by circuits or diagrams described herein whose related industrial properties, patents, or other righ ts belong to third parties. the application circuit examples explain typical applicatio ns of the products, and do not guarantee the success of any specific mass-production design. use of the information described herein for other purposes and/or re production or copying without the express permission of nanjing micro one electronics inc is strictly prohibited. the products described herein cannot be used as part of any device or equipment affecting the human body, such as exercise equipment, medical equipment, security systems, gas equipment, or any apparatus installed in airplanes and other vehicles, withou t prior written permission of nanjing micro one electronics inc. although nanjing micro one electronics inc exerts th e greatest possible effort to ensure high quality and reliability, the failure or ma lfunction of semiconductor products may occur. the user of these products should therefore give thorough consid eration to safety desi gn, including redundancy, fire-prevention measures, and malfunc tion prevention, to prevent any accidents, fires, or community damage that may ensue. 14/14 n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com

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