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| 1/13 u l tra - s mall package pwm/pfm switching control step-up switching regulator ver 03 ultr a-small package pwm/pfm switching control step-up switching regulator selection g uide ? descri ption ? th e me2129 seri es is a cmos step-up switching regulator which mainly consists of a reference voltage source, an oscillation circuit, an error amplifier, a phase compensation circuit, a pwm/pfm switching control circuit. with an external low-on-resistance nch power mos, this product is applicable to applications requiring high efficiency and high output current. the me2129 series switches its operation to the pfm control circuit whose duty ratio is 15 % with to the pwm/pfm switching control circuit under a light load and to prevent decline in the efficiency by ic operation current. fea ture ? l lo w voltage operation: start-up is guaranteed from 0.9 v(iout =1 ma ) l duty ratio: built-in pwm/pfm switching control circuit 15 to 78 % . l oscillator frequency ? 300khz l external parts: coil, diode, capacitor, and transistor l output voltage range: 1.5v ~6.5 v l output voltage accuracy ? 2% l soft start function: 2 ms. l package ? sot-23-5 ty pical application: l mobile phones (pdc, gsm, cdma, imt200 etc.) l bluetooth equipment l pda l portable communication modem l portable games l cameras l digital cameras l cordless phones l notebook computers v?mw`r?y?b? w w w . g o f o t e c h . c o m
2/13 ultra - small pa ckage pwm/pfm switching control step-up sw itching regulator ver 03 pin conf iguration ? sot-23-5 pin information ? type postf ix package switching transistor ce function vdd function fb function features me2129cxx m5 sot2 3-5 build in transistor yes no no lx + ce ME2129F m5 sot23-5 build in transistor yes yes yes lx +fb pin number sot-23-5 pin nam e function 1 ce shut down pin 2 lx swich 3 gnd gnd pin 4 nc nc 5 vout output voltage pin pin number sot-23-5 pin nam e function 1 ce shut down pin 2 lx swich 3 gnd gnd pin 4 vdd ic pow er supply pin 5 fb feed back voltage pin me2129cxx: m e2129f: 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? w w w . g o f o t e c h . c o m 3/13 ultra - small pa ckage pwm/pfm switching control step-up sw itching regulator ver 03 block diagram ? absolute maxim um rang ? parameter symb ol ratings units vdd pin voltag e vdd -0.3 ?^ 6.5 v lx pin voltag e lx -0.3 ?^ 20 v vout pin volta ge vout -0.3 ?^ 6.5 v ce pin voltag e vce -0.3 ?^ vin+0.3 v lxpin volt age ilx 1000 ma power dissi pation (sot-23-5) pd 250 mw operatingtemperature ra nge t opr -25~+85 ! storaget emperature range t stg -40~+12 5 ! 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? w w w . g o f o t e c h . c o m 4/13 ultra - small pa ckage pwm/pfm switching control step-up sw itching regulator ver 03 electrical charac teristics ? me2129d535 measuring condition s? vin=vout(s)x0.6,iout=100ma,vce=vdd=vout ? topt=25 !0 unless otherwise specified 0 parameter sy mbol conditions min typ max units circuit output voltage vout - vout(s)x 0.98 vout(s) vout(s)x 1.02 v 2 input vol tage vin - - - 6 v 2 operation start voltage vst1 iout =1ma - - 0.9 v 2 oscillation start voltage vst2 no ex ternal parts, voltage applied to vout - - 0.7 v 1 operation hol ding voltage vhld iout=1ma ? measured b y decre asing vin voltage gradua lly 0.7 - - v 2 current consumption 1 iss1 vout=vout(s ) 0.95 - 2.3 - ma 2 current consumption 2 iss2 vout=vout(s )+0.5v - 20 - ua 2 current consumption during shutdown isss vce=0v - 0.1 0.5 ua 2 line regul ation %3 vout1 vin=vout(s)0.4 ?^ 0.6 - 30 - mv 2 load regula tion %3 vout2 iout=10ua ?^ vout/501.25 - 35 - mv 2 output voltage te mperature coefficient ta=-25?85 ! - 50 - ppm/ ! 2 oscillation frequency fosc - 255 300 345 khz 1 max. duty ratio maxduty vout=vout(s) 0.95 - 78 - tj 1 pwm/pfm switching duty ratio pfmduty vin=vout(s)-0.1v, no load - 15 - tj 1 vsh me asured the oscillation at ext pin 0.75 - - v 1 vsl1 vout 1.5v - - 0.3 v 1 shutdown pi n input voltage vsl2 judged the stop of oscillation at ext pin vout<1.5v - - 0.2 v 1 ish vce= vo ut(s) 0.95 -0.1 - 0. 1 ua 1 shutdown pi n input voltage isl vce=0v -0.1 - 0. 1 ua 1 soft start ti me tss - 2 ms 2 efficiency ef fi - 85 tj 2 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? w w w . g o f o t e c h . c o m 5/13 ultra - small pa ckage pwm/pfm switching control step-up sw itching regulator ver 03 ME2129F measuring condition s? vdd=vce=3.3v ? topt=25 !0 unless otherwise specified 0 parameter sy mbol conditions mi n typ max units circuit feed back vol tage vfb - 1.225 1.25 1.275 v 4 input vol tage vin - - 6 v 4 operation start voltage vst1 iout =1ma - - 0.9 v 4 oscillation start voltage vst2 no ex ternal parts, voltage applied to vout - - 0.7 v 3 operation hol ding voltage vhld iout=1ma ? measured b y decreasing vin voltage gradua lly 0.7 - - v 4 current consumption 1 iss1 vfb=vf b(s) 0.95 - 1.5 - ma 3 current consumption 2 iss2 vfb=1.5v - 15 - ua 3 current consumption during shutdown isss vce=0v - 0.01 0.5 ua 3 feed back vol tage temperature coefficient ta=-25?85 ! - 50 - ppm/ ! 4 oscillation frequency fosc - 255 300 345 khz 3 max. duty ratio maxduty vfb=vfb(s) 0.95 - 78 - tj 3 pwm/pfm switching duty ratio pfmduty vfb=vfb(s) 1.5, no load - 15 - tj 3 vsh me asured the oscillation at lx pin 0.75 - - v 3 shutdown pi n input voltage vsl1 judged the stop of oscillation at lx pin vout 1.5v - - 0.3 v 3 ish vce=vf b(s)0.95 -0.1 - 0.1 ua 3 shutdown pi n input voltage isl vce=0v -0.1 - 0.1 ua 3 soft start ti me tss - - 2 - ms 4 efficiency effi - - 85 - tj 4 1. vout(s ) is the set output voltage value,and vout is the typital value of the output voltage. 2. vout(s) can be set by using the rate of vfb and output voltage setting resisitors(r1,r2). 3. vfb(s) is the set output voltage value. 4. vdd/vout separate type: 1.8v "f vdd<6v is recommended to stabilize the output voltage and oscillation frequency. 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? w w w . g o f o t e c h . c o m 6/13 ultra - small pa ckage pwm/pfm switching control step-up sw itching regulator ver 03 test circuit ? 1. 2. 3. 4. 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? w w w . g o f o t e c h . c o m 7/13 ultra - small pa ckage pwm/pfm switching control step-up sw itching regulator ver 03 external p arts ? suggest ? ? 1 0 diode use sc hottky diode such as in5817 or in5819 (forward voltage drop:0.2v) 2 0 inductor ?22 h ? r<0.5 ? 3 0 capacitor ? tantalum type 47uf 4 0 feed back resistors:r1+r2<50k external p arts selection for dc/dc converter: the relationship b etween major characteristics of the step-up circuit and characteristics parameters of the external parts are shown in figure 1. for hight eff iciency? for larg er output current? operati on effiency stand-b y efficiency for smaller ripple voltage? figure 1 re lationship between major characterstics of the step-up circuit and external parts 1. inductor an ind uctance has strong influence on maximum output current iout and efficiency .1. figure 2 shows the relation between iout, and characteristics to l of me2129. figure 2 l ? i out and characteristics the peak current (ipk) increases by decreasing l and the stability of a circuit improves and iout increases. if l is furthermore made small, efficiency falls and in running short, iout decreases. ( based on the current drive capability of external switching transistor.) smaller induct ance larg er inductance smaller dc r esisitance of inductor larg e output capacitance larg e output capacitance 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? w w w . g o f o t e c h . c o m 8/13 ultra - small pa ckage pwm/pfm switching control step-up sw itching regulator ver 03 the loss of ipk by the switching transistor decreases by increasing l and the efficiency becomes maximum at a certain l value. further increasing l decreases efficiency due to the loss of dc resistance of the coil. also, iout decreases, too. oscillation frequency is higher, smaller one can be choosed and also makes coil smaller. the recommended inductances are 22 to 100 h inductor for me2129. choose a value for l by refering to the reference data because the maximum output current is due to the input voltage in an actual case. choose an inductor so that ipk does not exceed the allowable current. exceeding the allowable current of the inductor causes magnetic saturation, remarkable low efficiency and destruction of the ic chip due to a large current. i pk in uncontinuo us mode is caluculated from the following equatuon )( . ) (2 a lf v vvi i osc n id out out pk -+ = fosc = oscillatio n frequency, v d 0.4 v. 2. diode use an external diode that meets the following requirements: ? low forward voltage: (v f <0.3 v) ? hig h switching speed: (50 ns max.) ? reverse voltage: v out + v f or more ? rated current: i pk or more 3. capacitor (c in , c o ) a capacitor a t the input side (c in ) improv es the efficiency by reducing the power impedance and stabilizing the input current. select a cin value according to the impedance of the power supply used. a capacitor at the output side (c o ) is used for s moothing the output voltage. for step-up types, the output voltage flows intermittently to the load current so that step-up types need a larger capacitance than step-down types. therefore, select an appropriate capacitor depending on the ripple voltage that increases in case of a higher output voltage or a higher load current. the capacitor value should be 10 f minimum. select an appropriate capacitor with an esr (equivalent series resistance) for stable output voltage. a stable range of the volatge at this ic depends on the esr. although the inductance (l) is also a factor, an esr of 30 m to 500 m draws out the characteristics. however, the best esr may depend on l, capacitance, wiring and applications (output load). therefore, fully evaluate esrs under an actual condition to determine the best value. 4. precautions ? mount exte rnal capacitors, a diode, and a coil as close as possible to the ic. unique ripple voltage and spike noise occur in switching regulators. because they largely depend on the coil and the capacitor used, check them using an actually mounted model. make sure dissipation of the switching transistor (especially at a high temperature) does not exceed the allowable power dissipation of the package. the performance of this ic varies depending on the design of the pcb patterns, peripheral circuits and external parts. thoroughly test all settings with your device. also, try to use recommended external parts. 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? w w w . g o f o t e c h . c o m 9/13 ultra - small pa ckage pwm/pfm switching control step-up sw itching regulator ver 03 typical application circuit for use chip enable for fb and chip enable 1 for fb and chi p enable 2 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? w w w . g o f o t e c h . c o m 10/13 ultra - small pa ckage pwm/pfm switching control step-up sw itching regulator ver 03 typical per formance characteristics 1. output w aveforms iout=1ma iout=10ma iout=100m a iout=200ma 2. transient response characteristics ? 1 ? powering on ? vin: 0 2v ? iout=1ma iout=100ma 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? w w w . g o f o t e c h . c o m 11/13 ultra - small pa ckage pwm/pfm switching control step-up sw itching regulator ver 03 ? 2 ? responses of ce pin ? ce: 0 2v ? iout=1ma iout=100ma 3. output curre nt vs. output voltage 4 4 . 2 4 . 4 4 . 6 4 . 8 5 5 . 2 5 . 4 1 1 0 1 0 0 1 0 0 0 i o u t [ m a ] v o u t [ v ] v i n = 1 . 2 v v i n = 1 . 5 v v i n = 1 . 8 v v i n = 3 v v i n = 4 . 2 v 4. output curre nt vs. efficiency 1 5 . 0 0 2 5 . 0 0 3 5 . 0 0 4 5 . 0 0 5 5 . 0 0 6 5 . 0 0 7 5 . 0 0 8 5 . 0 0 9 5 . 0 0 1 1 0 1 0 0 1 0 0 0 i o u t [ m a ] e f f i c i e n c y [ % ] v i n = 1 . 2 v v i n = 1 . 5 v v i n = 3 v v i n = 4 . 2 v 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? w w w . g o f o t e c h . c o m 12/13 ultra - small pa ckage pwm/pfm switching control step-up sw itching regulator ver 03 package dimensions ? %? sot-23-5 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? w w w . g o f o t e c h . c o m 13/13 ultra - small pa ckage pwm/pfm switching control step-up sw itching regulator ver 03 the infor mation described herein is subject to change without notice. nanjing micro one electronics inc is not responsible for any problems caused by circuits or diagrams described herein whose related industrial properties, patents, or other rights belong to third parties. the application circuit examples explain typical applications 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 reproduction 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, without prior written permission of nanjing micro one electronics inc. although nanjing micro one electronics inc exerts 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 thorough consideration to safety design, including redundancy, fire-prevention measures, and malfunction prevention, to prevent any accidents, fires, or community damage that may ensue. 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? w w w . g o f o t e c h . c o m |
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