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ME2101 series ve r 02 me 21 01 a pack age p?sot89 m?sot23 version or function feature code 27?2.7v 30?3.0v 33?3.3 50?5.0v ?... microne xx x pro duc t type product series type postfix p ackage switching transistor ce function features m sot - 23-3 me210 1a xx p sot-89-3 build_in transistor no lx m sot - 23-3 me210 1b xx p sot-89-3 extemal transistor no ext m sot - 23-5 me210 1c xx p sot-89-5 build_in transistor yes lx+ce m sot - 23-5 me210 1d xx p sot-89-5 extemal transistor yes ext+ce ME2101 series is a pwm s tep-up dc/dc converter ic with low supply current by cmos process. high frequency noise that occurs during switching is reduced by using advanced circuit designed, output voltage is programmable in 0.1v steps between 2.0~5.0v and maximum frequency is 100khz(typ.). a low ripple, high efficiency step-up dc/dc converter can be constructed of ME2101a xxx with only three external components. also available is a ce(chip enable) function that reduce power dissipation during shut-down mode., and an independent vdd pin func tion (separated power supply and voltage detect pins) for fly-back circuits.an inner soft-start circuit limits current surges from input power supply at start up and the reliability of the chip is improved. ME2101xxxx is suitable for use with battery-powered instruments with low noise and low supply current. ? power source for battery- powered equipment ? pow e r source for wireless mouse, wireless keyboard, toys, cameras, camcorders, vcrs, pdas, and hand-held communication equipment ? power so urce for appliances which require higher cell voltage than that of batteries used in the appliances features ? small number of extern al componen ts: only an inductor, a diode and a capacitor ? low ripple and low nois e ? operating vol tage range 0.9v~6.5v ? output voltage range 2.0v~5.0v(step 0.1v) ? output voltage accuracy 2.5% ? output current if vin=3.0v and vout=3.3v then iout=350ma ? low start voltage 0.9v(at iout=1ma) ? maximum oscillator frequency 100khz(typ.) ? high efficiency 87%(type) ? slow-start time 15ms(type) ? package sot-23 sot-89. applications ME2101 series s t ep-up dc-dc converter selection guide 1(1 1 ) v?mw`r?y?b? www.gofotech.com
ME2101 series ver 02 pin configuration pin assignment ME2101axx pin number sot-23-3 sot-89-3 pin na me function 1 1 vss ground 3 2 vout output voltage monitor , ic internal power supply 2 3 lx switc h ME2101bxx pin number sot-23-3 sot-89-3 pin na me function 1 1 vss ground 3 2 vout output voltage monitor , ic internal power supply 2 3 ext external switc h transistor drive ME2101cxx pin number sot-23-5 sot-89-5 pin n a me function 4 5 vss ground 2 2 vout output voltage monitor , ic internal power supply 5 4 lx switch 1 3 ce chip enab le 3 1 nc nc ME2101dxx pin number sot-23-5 sot-89-5 pin n a me function 4 5 vss ground 2 2 vout output voltage monitor , ic internal power supply 5 4 ext external switc h transistor drive 1 3 ce chip enab le 3 1 nc nc 2(11) 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
ME2101 series ver 02 block diagram absolute maximum ratings parameter symb a l ratings units v in input voltage v in 6.5 v lx pin voltag e v lx 6.5 v ext pin voltage v ext -0.3~vou t +0.3 v ce pin voltage v ce -0.3~vou t +0.3 v lx pin current i lx 600 ma ext pin current i ext 30 ma vdd input voltage v dd 6.5 v sot-23 pd 300 mw continuous tot a l power dissipation sot-89 pd 500 mw operating ambient temperatur e t opr -25~+85 storage tempe r ature t stg -40~+125 soldering temperature and tim e t solder 260, 10s 3(11) 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
ME2101 series ver 02 electrical characteristics ME2101a30 vout=3.0v , fosc=100khz symb-ol param e ter conditions min typ max units v out output voltage 2.925 3.000 3.075 v v in maximum input voltage 6.5 v v start oscillation start-up v o ltage i out =1ma v in 0 2v 0.8 0.9 v v hold oscillation hold v olt age i out =1ma v in 2 0v 0.24 v i dd1 supply curre nt 1 no external component vout=vout*0.95, 30 a i dd2 supply curre nt 2 vout=vout+0.5v 11 a i lx lx switchi ng current v lx =0.4v, vout= v out*0.95 250 ma i lxleak lx leakage current vout=v lx =6v 0.5 a i exth ext?high? on current same as i dd1 . vext=vout-0.4v , -6 ma i extl ex t?low ? on current same as i dd1 .. vext =0.4v, 14 ma v ceh ce?high? volt a ge vout=vce=set vout*0.95 0.70 v v cel ce?low? vo lt age vout=vce=set vout*0.95 0.20 v i ceh ce?high? current v out= 6.0v, vce=6.0v 0.25 ua i cel ce?low? cu rre nt vout=6.0v, vce=0.0v -0.25 ua f osc oscillatio n freque nc y vout=set vout*0.95 100 khz maxdty duty ratio on(v lx l )side 80 87 92 % effi efficienc y 87 % tss slow-st a rt time 5 15 25 ms measuring conditions unl e ss otherwise specified , v in =vout*0.6 v ss =0v i out =10ma t opt =25 note 1 d i ode use schottky diode such as in5817 or in5819 (forward voltage drop:0. 2v) 2 inductor 47h r<0.5 ? 3 capacitor t antalum type 47f 4(11) 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
ME2101 series ver 02 electrical characteristics ME2101a33 vout=3.3v , fosc=100khz symb-ol param e ter conditions min typ max units v out output voltage 3.218 3.300 3.382 v v in maximum input voltage 6.5 v v start oscillation start-up v o ltage i out =1ma v in 0 2v 0.8 0.9 v v hold oscillation hold v olt age i out =1ma v in 2 0v 0.24 v i dd1 supply curre nt 1 no external component vout=vout*0.95, 35 a i dd2 supply curre nt 2 vout=vout+0.5v 13 a i lx lx switchi ng current v lx =0.4v, vout= v out*0.95 260 ma i lxleak lx leakage current vout=v lx =6v 0.5 a i exth ext?high? on current same as i dd1 . vext=vout-0.4v , -6 ma i extl ex t?low ? on current same as i dd1 .. vext =0.4v, 14 ma v ceh ce?high? volt a ge vout=vce=set vout*0.95 0.70 v v cel ce?low? vo lt age vout=vce=set vout*0.95 0.20 v i ceh ce?high? current v out= 6.0v, vce=6.0v 0.25 ua i cel ce?low? cu rre nt vout=6.0v, vce=0.0v -0.25 ua f osc oscillatio n freque nc y vout=set vout*0.95 100 khz maxdty duty ratio on(v lx l )side 80 87 92 % effi efficienc y 85 % tss slow-st a rt time 5 15 25 ms measuring conditions unl e ss otherwise specified , v in =vout*0.6 v ss =0v i out =10ma t opt =25 note 1 d i ode use schottky diode such as in5817 or in5819 (forward voltage drop:0. 2v) 2 inductor 47h r<0.5 ? 3 capacitor t antalum type 47f 5(11) 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
ME2101 series ver 02 electrical characteristics ME2101a50 vout=5.0v , fosc=100khz symb-ol param e ter conditions min typ max units v out output voltage 4.875 5.000 5.125 v v in maximum input voltage 6.5 v v start oscillation start-up v o ltage i out =1ma v in 0 2v 0.8 0.9 v v hold oscillation hold v olt age i out =1ma v in 2 0v 0.24 v i dd1 supply curre nt 1 no external component vout=vout*0.95, 70 a i dd2 supply curre nt 2 vout=vout+0.5v 26 a i lx lx switchi ng current v lx =0.4v, vout= v out*0.95 290 ma i lxleak lx leakage current vout=v lx =6v 0.5 a i exth ext?high? on current same as i dd1 . vext=vout-0.4v , -5.72 ma i extl ex t?low ? on current same as i dd1 .. vext =0.4v, 13.25 ma v ceh ce?high? volt a ge vout=vce=set vout*0.95 0.70 v v cel ce?low? vo lt age vout=vce=set vout*0.95 0.20 v i ceh ce?high? current v out= 6.0v, vce=6.0v 0.25 ua i cel ce?low? cu rre nt vout=6.0v, vce=0.0v -0.25 ua f osc oscillatio n freque nc y vout=set vout*0.95 100 khz maxdty duty ratio on(v lx l )side 80 87 92 % effi efficienc y 85 % tss slow-st a rt time 5 15 25 ms measuring conditions unl e ss otherwise specified , v in =vout*0.6 v ss =0v i out =10ma t opt =25 note 1 d i ode use schottky diode such as in5817 or in5819 (forward voltage drop:0. 2v) 2 inductor 47h r<0.5 ? 3 capacitor t antalum type 47f 6(11) 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
ME2101 series ver 02 operation s w itching d c /dc s t ep_up converter operating process selection of peripheral components and application notes peripheral components sho u ld be selected carefully because they are greatly affect the performances of ME2101 ? use capacitor with a capacity of 10 f or more ( too small capacity will lead to high output ripple), and with good frequency characteristics ( it is better to use tantalum type). besides, it is recommended the use of a capacitor with an allowable voltage which is at least th ree times the output set volt age. this is because there may be the case where a spike-shaped high voltage is generated by the inductor when lx transistor is turned off. ? choose such an inductor that has sufficiently small d.c. resistance and large allowable current, and hardly reaches magnetic saturation. when the inductance value of the inductor is small, t here may be the case where i lx exceeds the absolute maxi mum ratings at the maximum load. ? use a diode of a schottky type with high switching speed. notes ? set external components as close as possible to the ic and minimize the connection between the components and the ic. in particular, when an external component is connected to v out pin, make minimum connection w i th the capacitor. a 0.1f ceramic capacitor is suggested to be parallelly connected to v out pin and vss pin. ? make vss pin sufficient gro u nding, otherwise, the zero level within ic will varied with the switching current. this may result in unstable operation of ic. ME2101 step-up dc/dc converter charges energy in the inductor when l x transistor is on, and discharges the energy wi th the addition of the energy from input power source thereto, so that a high er output voltage than the input voltage is obtained. following is the o p eration dia g ram. 7(11) 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
ME2101 series ver 02 typical applications components inductor 47uh(s umida ) diode in5817 in5819 capacitor 47uf/16v(tantalume type) transistor 2sd1628g 2sd3279 nmos aat9460 xp151 xp161 base resistor(rb) 1k base capacitor(cb) 2200pf r fb :set up so that r fb1 /r fb2 =vout-1(vout=set-up output volt ag e), please use with r fb1 +r fb2 2m ; c fb :set up that fzfb=1/(2 c fb r fb1 ) is within the adjus t ment s necessary in respect of l,c l . 8(11) 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
ME2101 series ver 02 type characteristics 9(11) 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
ME2101 series ver 02 package diomensions 10(11) 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
ME2101 series ver 02 the information described here in is subject to change withou t notice. nanjing micro one electronics inc is not respon sible for any problems caused by circuits or diagrams described herein whose re lated industrial properties, patent s, or other rights belong to third parties. the application ci rcuit examples explain typical applications of the products, and do not guarantee the success of an y 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 micr o 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 airp lanes and other vehicles, without prior written permission of nanjing micro one electronics inc. although nanjing micro one electronics inc exer ts the greatest possible effort to ensure high quality and reliability, the failure or malfunction of semiconductor products may occur. the user of these products should therefore give th orough consideration to safety design, including redundancy, fire-prevention measur es, and malfunction prevention , to prevent any accidents, fires, or community damage that may ensue. 11(11) 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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