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mic2202 high efficiency 2mhz synchronous buck converter 1f stable pwm regulator mlf and micro leadframe are registered trademarks of amkor technology, inc. micrel inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? tel +1 ( 408 ) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micrel.com march 2007 1 m9999-031907 general description the micrel mic2202 is a high efficiency 2mhz pwm synchronous buck regulator. the fast 2mhz operation along with a proprietary compensation scheme allows the smallest possible external components. the mic2202 can operate with a 1f ceramic output capacitor and a small, low dc-resistance, 2.2h indu ctor, reducing system size and cost while allowing a high level of efficiency. the mic2202 operates from 2.3v to 5.5v input and features internal power mosf ets that can supply over 600ma of output current with output voltages down to 0.5v. the mic2202 implements a constant 2mhz pulse- width-modu-lation (pwm) cont rol scheme which reduces noise in sensitive rf, audio, and communications applications. additionally, the mic2202 can be synchronized to an external clock, or multiple mic2202s can easily be daisy-chained with the synclock feature. the mic2202 has a high bandwidth loop (up to 500khz) which allows ultra fast transi ent response times. this is very useful when powering appl ications that require fast dynamic response such as cpu cores and rf circuitry in high performance cellular phones and pdas. the mic2202 is available in 10-pin msop and 10-pin 3mm 3mm mlf ? package options with an operating junction temperature range from ?40c to +125c. data sheets and support doc umentation can be found on micrel?s web site at: www.micrel.com. features ? input voltage range: 2.3v to 5.5v ? output down to 0.5v/600ma ? 2mhz pwm operation ? stable with 1f ceramic output capacitor. ? ultra-fast transient response (up to 500khz gbw) ? internal compensation ? all ceramic capacitors ? >95% efficiency ? fully integrated mosfet switches ? easily synchronized to external clock ? synclock feature to daisy chain multiple 2202s ? requires only 4 external components ? 1% line and load regulation ? logic controlled micropower shutdown ? thermal shutdown and current limit protection ? 10-pin msop and 10-pin 3mm3mm mlf ? package options ? ?40c to +125c junction temperature range applications ? cellular phones ? pdas ? 802.11 wlan power supplies ? fpga/asic power supplies ? dynamically adjustable power supply for cdma/w- cdma rf power amps ? dsl modems ? tape drives ___________________________________________________________________________________________________________ typical application 10nf 2.2h v out 3.3v 600ma v in 2.3v to 5.5v 1f 10k 1.78k en 6 5 1 sync_in sync_out 10 9 8 7 2 3 4 adjustable output synchronous buck regulator 60 65 70 75 80 85 90 95 100 0 0.1 0.2 0.3 0.4 0.5 0.6 efficiency (%) output current (a) efficiency 3.3v out 5v in 4.2v in l = 2.2h c out =1f
micrel, inc. mic2202 march 2007 2 m9999-031907 ordering information part number voltage temperature range package lead finish mic2202bmm adj. ?40 to +125c 10-pin msop standard MIC2202BML adj. ?40 to +125c 10-pin mlf ? standard mic2202ymm adj. ?40 to +125c 10-pin msop pb-free mic2202yml adj. ?40 to +125c 10-pin mlf ? pb-free pin configuration en fb 6 5 1 sw vin sync_in sync_out 10 gnd gnd gnd bias 9 8 7 2 3 4 sw vin sync_in sync_out gnd gnd gnd bias 1 2 3 4 10 9 8 7 56 en fb ep 10-pin msop (mm) 10-pin mlf ? (ml) pin description pin number pin name pin function 1 sw switch (output): internal power mosfet output switches. 2 vin supply voltage (input): requires bypass capacitor to gnd. 3 sync_in sync_in for the mic2202: sync the main switching frequency to an external clock. 4 sync_out sync_out an open collector output. 5 en a low level en will power down the dev ice, reducing the quiescent current to under 1a. 6 fb input to the error amplifier, connect to t he external resistor divider network to set the output voltage. 7 bias internal circuit bias supply, nominally 2.3v. must be de-coupled to signal ground with a 0.01f capacitor. 8, 9, 10 gnd ground. ep gnd ground, backside pad.
micrel, inc. mic2202 march 2007 3 m9999-031907 absolute maximum ratings (1) supply voltage (v in ) .........................................................6v output switch voltage (v sw ) ............................................6v logic input voltage (v en , v sync_in ).................... v in to ?0.3v power dissi pation ..................................................... note 3 storage temperature (t s ) .........................?65c to +150c esd rating (4) .................................................................. 2kv operating ratings (2) supply voltage (v in )..................................... +2.3v to +5.5v junction temperature (t j ) ..................?40c t j +125c package thermal resistance msop-10l ( ja ) ...............................................115 c/w 3x3 mlf-10 ( ja ) ...............................................60c/w electrical characteristics (5) t a = 25c with v in = 3.5v unless otherwise noted; bold values indicate ?40c< t j < +125c. parameter condition min typ max units supply voltage range 2.3 5.5 v en = v in ; v fb = 0.55v (not switching) 350 450 a quiescent current en = 0v 0.01 1 a mic2202 [adjustable] feedback voltage 0.4875 0.5 0.5125 v output voltage line regulation v out < 2v; v in = 2.3v to 5.5v, i load = 100ma 0.05 0.5 % output voltage load regulation 0ma < i load < 500ma 0.1 0.5 % bias regulator output voltage 2.2 2.32 2.6 v maximum duty cycle v fb = 0.7v 100 % current limit v fb = 0.7v 1 1.8 2.5 a switch on-resistance v in = 3.5v, i sw = 300ma; v fb = 0.35v 0.65 0.9 ? v in = 3.5v, i sw = 300ma; v fb = 0.55v 0.55 0.75 ? enable input current 0.01 1 a sync frequency range 1.6 2.5 mhz sync_in threshold 0.7 1 1.7 v sync minimum pulse width 10 ns sync_in input current 1 a oscillator frequency 1.8 2 2.2 mhz enable threshold 0.5 0.9 1.3 v enable hysteresis 20 mv over-temperature shutdown 160 c over-temperature shutdown hysteresis 20 c notes: 1. exceeding the absolute maximum rating may damage the device. 2. the device is not guaranteed to function outside its operating rating. 3. absolute maximum power dissipation is lim ited by maximum junction temperature where p d(max) = (t j(max) ? t a ) ja . 4. devices are esd sensitive. handling precautions re commended. human body model, 1.5k in series with 100pf. 5. specification for packaged product only.
micrel, inc. mic2202 march 2007 4 m9999-031907 typical characteristics 0.4950 0.4975 0.5000 0.5025 0.5050 0 0.1 0.2 0.3 0.4 0.5 output voltage (v) output current (a) outout voltage vs. output current 0.485 0.490 0.495 0.500 0.505 0.510 0.515 -40 -20 0 20 40 60 80 100 120 output voltage (v) temperature (c) output voltage vs. temperature 0 0.5 1.0 1.5 2.0 2.5 0246 v bias (v) supply voltage (v) v bias vs. supply voltage v fb =0v 2.302 2.304 2.306 2.308 2.31 2.312 2.314 2.316 2.318 2.320 -40 -20 0 20 40 60 80 100 120 bias supply (v) temperature (c) bias suppl y vs. temperature 0 50 100 150 200 250 300 350 0123456 i q (a) supply voltage (v) quiescent current vs. supply voltage v fb =0v 332 334 336 338 340 342 344 346 348 350 352 354 -40 -20 0 20 40 60 80 100 120 i q (a) temperature (c) quiescent current vs. temperature v in =3.6v 1.60 1.70 1.80 1.90 2.00 2.10 2.20 2.30 2.40 -40 -20 0 20 40 60 80 100 120 frequency (mhz) temperature (c) frequency vs. temperature 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 2.3 2.8 3.3 3.8 4.3 4.8 5.3 enable threshold (v) supply voltage (v) enable threshol d vs. supply voltage enable on enable off 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 -40 -20 0 20 40 60 80 100 120 enable threshold (v) temperature (c) enable threshol d vs. temperature 3.6v in
micrel, inc. mic2202 march 2007 5 m9999-031907 block diagram error amplifier sw c out v out fb en bias sync_in sync_out pgnd pwm comparator 0.5v mic2202 internal supply oscillator ramp generator v in c in vin driver mic2202 block diagram
micrel, inc. mic2202 march 2007 6 m9999-031907 functional description vin vin provides power to the out put and to the internal bias supply. the supply voltage range is from 2.3v to 5.5v. a minimum 1f ceramic is recommended for bypassing the input supply. enable the enable pin provides a l ogic level control of the output. in the off state, suppl y current of the device is greatly reduced (typically <1a ). also, in the off state, the output drive is placed in a ?tri-stated? condition, where both the high side p-channel mosfet and the low-side n-channel are in an off or non-conducting state. do not drive the e nable pin above the supply voltage. sync_in sync_in pin enables the ab ility to change the funda- mental switching frequency. the sync_in frequency has a minimum frequency of 1.6mhz and a maximum sync frequency of 2.5mhz. careful attention should be paid to not driving the sync_in pin greater than the supply voltage. while this will not damage the device, it can cause improper operation. sync_out sync_out is an open collector output that provides a signal equal to the internal oscillator frequency. this creates the ability for multiple mic2202s to be connected together in a master-slave configuration for frequency matching of the converters. a typical 10k ? is recommended for a pull-up resistor. bias the bias supply is an internal 2.3v linear regulator that supplies the internal biasing voltage to the mic2202. a 10nf ceramic capacitor is required on this pin for bypassing. do not use the bias pin as a supply. the bias pin was designed to supply internal power only. feedback the feedback pin provides the control path to control the output. a resistor divider connecting the feedback to the output is used to adjust the desired output voltage. refer to the feedback section in t he ?applications information? for more detail. sync_in vin mic2202 ?master? sync_out sw bias fb sync_in vin mic2202 ?slave? sync_out sw bias fb figure 1. master-slave operation
micrel, inc. mic2202 march 2007 7 m9999-031907 application information input capacitor a minimum 1f ceramic is recommended on the vin pin for bypassing. x5r or x7r dielectrics are recommended for the input capacitor. y5v di electrics, aside from losing most of their capacitance ov er temperature, they also become resistive at high freque ncies. this reduces their ability to filter out high frequency noise. output capacitor the mic2202 was designed specifically for the use of a 1f ceramic output capacitor. this value can be increased to improve transi ent performance. since the mic2202 is voltage mode, the control loop relies on the inductor and output capacitor for compensation. for this reason, do not use excessively large output capacitors. the output capacitor requires either an x7r or x5r dielectric. y5v and z5u dielectric capacitors, aside from the undesirable effect of their wide variation in capacitance over temperature, become resistive at high frequencies. using y5v or z5u capacitors will cause instability in the mic2202. total output capacitance should not exceed 15f. large values of capacitance can cause current limit to engage during start-up. if larger than 15f is required, a feed- forward capacitor from the output to the feedback node should be used to slow the start up time. inductor selection inductor selection will be det ermined by the following (not necessarily in the order of importance): ? inductance ? rated current value ? size requirements ? dc resistance (dcr) the mic2202 is designed for use with a 1h to 4.7h inductor. maximum current ratings of the inductor are generally given in two methods: per missible dc current and saturation current. permissible dc current can be rated either for a 40c temperature rise or a 10% loss in inductance. ensure the inductor selected can handle the maximum operating current. when saturation current is specified, make sure that there is enough margin that the peak current will not saturate the inductor. the size requirements refer to the area and height requirements that are necessary to fit a particular design. please refer to the inductor dimensions on their datasheet. dc resistance is also important. while dcr is inversely proportional to size, dcr can represent a significant efficiency loss. refer to t he ?efficiency considerations? below for a more detailed description. bias capacitor a small 10nf ceramic capacitor is required to bypass the bias pin. the use of low esr ceramics provides improved filtering for the bias supply. efficiency considerations efficiency is defined as the amount of useful output power, divided by the amount of power consumed. efficiency % = 100 i v i v in in out out ? ? ? ? ? ? ? ? maintaining high efficiency serves two purposes. it reduces power dissipation in the power supply, reducing the need for heat sinks and thermal design considera- tions and it reduces consumpt ion of current for battery powered applications. reduced current draw from a battery increases the devices operating time, critical in hand held devices. there are two loss terms in switching converters: dc losses and switching losses. dc losses are simply the power dissipation of i 2 r. power is dissipated in the high side switch during the on cycle. power loss is equal to the high side mosfet rds (on) multiplied by the switch current 2 . during the off cycle, the low side n-channel mosfet conducts, also dissipating power. device operating current also reduces efficiency. the product of the quiescent (operating) current and the supply voltage is another dc loss. the current required to drive the gates on and off at a constant 2mhz frequency and the switching transitions make up the switching losses. figure 2 shows an efficien cy curve. the non-shaded portion, from 0ma to 200ma, efficiency losses are dominated by quiescent current losses, gate drive and transition losses. in this case, lower supply voltages yield greater efficiency in that they require less current to drive the mosfets and have reduced input power consumption. 50 55 60 65 70 75 80 85 90 95 100 0 0.1 0.2 0.3 0.4 0.5 0.6 efficiency (%) output current (a) 3.3v out 4.2v in 5v in efficienc y vs. output current figure 2. efficiency curve
micrel, inc. mic2202 march 2007 8 m9999-031907 the shaded region, 200ma to 500ma, efficiency loss is dominated by mosfet rds (on) and inductor dc losses. higher input supply voltages will increase the gate-to- source threshold on the inte rnal mosfets, reducing the internal rds (on) . this improves efficiency by reducing dc losses in the device. all but the inducto r losses are inherent to the device. in which case, inductor selection becomes increasingly critical in efficiency calculations. as the inductors are reduced in size, the dc resistance (dcr) can become quite significant. the dcr losses can be calculated as follows; lpd = iout2 dcr from that, the loss in efficiency due to inductor resistance can be calculated as follows: efficiency loss = 100 l i v i v 1 pd out out out out ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? + ? efficiency loss due to dcr is minimal at light loads and gains significance as the l oad is increased. inductor selection becomes a trade-off between efficiency and size in this case. alternatively, under lighter l oads, the ripple current due to the inductance becomes a significant factor. when light load efficiencies become more critical, a larger inductor value maybe desired. larger inductances reduce the peak-to-peak rippl e current which minimize losses. the followi ng graph illustrate s the effects of inductance value at light load. 0 20 40 60 80 100 0 255075100 efficiency (%) output current (ma) 1.8v out 4.7h 1h efficienc y vs. inductance 2.2h figure 3. efficiency vs. inductance compensation the mic2202 is an internally compensated, voltage mode buck regulator. voltage mode is achieved by creating an internal 2mhz ramp signal and using the output of the error amplifier to pulse width modulate the switch node, maintaining out put voltage regulation. with a typical gain bandwidth of 200khz, the mic2202 is capable of extremely fast transient responses. the mic2202 is designed to be stable with a 2.2h inductor and a 1f cerami c (x5r) output capacitor. these values can be interchanged (i.e. 1h inductor and a 2.2f capacitor). the trade off between changing these values is that with a larger inductor, there is a reduced peak-to-peak current which yields a greater efficiency at lighter loads. a larger ou tput capacitor will improve transient response by providing a larger hold up reservoir of energy to the output. feedback the mic2202 provides a feedback pin to adjust the output voltage to the desired level. this pin connects internally to an error amplifier. the error amplifier then compares the voltage at the feedback to the internal 0.5v reference voltage and adjusts the output voltage to maintain regulation. to calculate the resistor divider network for the desired output is as follows: ? ? ? ? ? ? ? ? ? = 1 v v r1 r2 ref out where v ref is 0.5v and v out is the desired output voltage. a 10k ? or lower resistor value from the output to the feedback is recommende d. larger resistor values require an additional capacitor (feed-forward) from the output to the feedback. the la rge high side resistor value and the parasitic capaci tance on the feedback pin (~10pf) can cause an additional pole in the loop. the additional pole can create a phase loss at high frequency. this phase loss degrades transient response by reducing phase margin. adding feed-forward capacitance negates the parasit ic capacitive effects of the feedback pin. a minimu m 1000pf capacitor is recommended for feed-forward capacitance. also, large feedback resistor values increase the impedance, making the feedba ck node more susceptible to noise pick-up. a feed-forward capacitor would also reduce noise pick-up by providing a low impedance path to the output. pwm operation the mic2202 is a pulse width modulation (pwm) controller. by controlling the ratio of on-to-off time, or duty cycle, a regulated dc output voltage is achieved. as load or supply voltage changes, so does the duty cycle to maintain a const ant output voltage. in cases where the input supply runs into a dropout condition, the mic2202 will run at 100% duty cycle. the mic2202 provides constant switching at 2mhz with synchronous internal mosfets. the internal mosfets include a high-side p-channel mosfet from the input supply to the switch pin and an n-channel mosfet from the switch pin to ground. since the low-side n- channel mosfet provides the current during the off cycle, a free wheeling schottky diode from the switch node to ground is not required.
micrel, inc. mic2202 march 2007 9 m9999-031907 pwm control provides fix ed frequency operation. by maintaining a constant switching frequency, predictable fundamental and harmonic frequencies are achieved. other methods of regulation, such as burst and skip modes, have frequency spectrums that change with load that can interfere with se nsitive communication equip- ment. synchronization sync_in allows the user to change the frequency from 2mhz up to 2.5mhz or down to 1.6mhz. this allows the ability to control the fundam ental frequency and all the resultant harmonics. maintaining a predictable frequency creates the ability to either shift the harmonics away from sensitive carrier and if frequency bands or to accurately filter out spec ific harmonic frequencies. the sync_out function pin a llows for the ability to be able to sync up multiple mic2202s in a ?daisy-chain?, connecting sync_out to sync _in of the other mic2202. synchronizing multiple mic2202s benefits much in the same way as syncing up one mic2202. all regulators will run at the same fundament al frequency, resulting in matched harmonic frequencies, simplifying designing for sensitive communication equipment. sync_in vin mic2202 ?master? sync_out sw bias fb sync_in vin mic2202 ?slave? sync_out sw bias fb figure 4. master-slave operation figure 5. master-slave synchronization waveforms
micrel, inc. mic2202 march 2007 10 m9999-031907 mic2202bmm with 2.2h induct or and 1f output capacitor -30 -20 -10 0 10 20 30 40 50 60 70 -108 -72 -36 0 36 72 108 144 180 216 252 1x10 2 1x10 3 1x10 4 1x10 5 1x10 6 1x10 7 gain (db) phase () frequency (hz) bode plot phase gain 5v in 1.8v out l=1h c = 2.2f -30 -20 -10 0 10 20 30 40 50 60 70 -108 -72 -36 0 36 72 108 144 180 216 252 1x10 2 1x10 3 1x10 4 1x10 5 1x10 6 1x10 7 gain (db) phase () frequency (hz) bode plot phase gain 5v in 1.8v out l=1h c = 2.2f 60 65 70 75 80 85 90 95 100 0 0.1 0.2 0.3 0.4 0.5 0.6 efficiency (%) output current (a) efficiency 3.3 v out 5v in 4.2v in l = 2.2h c out =1f 60 65 70 75 80 85 90 95 100 0 0.1 0.2 0.3 0.4 0.5 0.6 efficiency (%) output current (a) efficiency 2.5v out 3.6v in 3v in l = 2.2h c out =1f 4.2v in 60 65 70 75 80 85 90 95 100 0 0.1 0.2 0.3 0.4 0.5 0.6 efficiency (%) output current (a) efficiency 1.8v out 3.6v in 3v in l = 2.2h c out =1f 4.2v in 60 65 70 75 80 85 90 95 100 0 0.1 0.2 0.3 0.4 0.5 0.6 efficiency (%) output current (a) efficiency 1.5v out 3.6v in 3v in l = 2.2h c out =1f 4.2v in 60 65 70 75 80 85 90 95 100 0 0.1 0.2 0.3 0.4 0.5 0.6 efficiency (%) output current (a) efficiency 1.2v out 3.6v in 3v in l = 2.2h c out =1f 4.2v in
micrel, inc. mic2202 march 2007 11 m9999-031907 mic2202bmm with 2.2h induct or and 1f output capacitor v in mic2202bmm en sync_out vin vsw bias sync_in fb gnd c2 0.01f gnd 2 5 4 3 7 gnd c3 1f c1 1f v out 600ma gnd 1 6 10 9 8 l1 2.2h r1 10k r2 see bom for values gnd figure 6. mic2202bmm schematic bill of materials item part number manufacturer description qty. 06036d105mat2 avx (1) c1, c3 grm185r60j105ke21d murata (2) 1f ceramic capacitor x5r, 6.3v, size 0603 2 0201zd103mat2 avx (1) 10nf ceramic capacitor 6.3v, size 0201 c2 grm033r10j103ka01d murata (2) 10nf ceramic capacitor 6.3v, size 0202 1 lqh32cn2r2m53k murata (2) 2.2h inductor 97m ? (3.2mmx2.5mmx1.55mm) l1 cdrh2d14-2r2 sumida (3) 2.2h inductor 94m ? (3.2mmx3.2mmx1.55mm) 1 r1 crcw04021002f vishay-dale (4) 10k ? 1%, size 0402 1 crcw04021781f 1.78k ? 1%, size 0402 for 3.3v out crcw04022491f 2.49k ? 1%, size 0402 for 2.5v out crcw04023831f 3.83k ? 1%, size 0402 for 1.8v out crcw04024991f 4.99k ? 1%, size 0402 for 1.5v out crcw04027151f 7.15k ? 1%, size 0402 for 1.2v out crcw04021002f vishay-dale (4) 10k ? 1%, size 0402 for 1v out r2 n/a open for 0.5v out 1 u1 mic2202bmm micrel, inc. (5) 2mhz high efficiency synchronous buck regulator 1 notes: 1. avx: www.avx.com 2. murata: www.murata.com 3. sumida: www.sumida.com 4. vishay-dale: www.vishay.com 5. micrel, inc.: www.micrel.com
micrel, inc. mic2202 march 2007 12 m9999-031907 mic2202bmm with 1h inductor and 2.2f out put capacitor -30 -20 -10 0 10 20 30 40 50 60 70 -108 -72 -36 0 36 72 108 144 180 216 252 1x10 2 1x10 3 1x10 4 1x10 5 1x10 6 1x10 7 gain (db) phase () frequency (hz) bode plot phase gain 5v in 1.8v out l=1h -30 -20 -10 0 10 20 30 40 50 60 70 -108 -72 -36 0 36 72 108 144 180 216 252 1x10 2 1x10 3 1x10 4 1x10 5 1x10 6 1x10 7 gain (db) phase () frequency (hz) bode plot phase gain 3.6v in 1.8v out l=1h 60 65 70 75 80 85 90 95 100 0 0.1 0.2 0.3 0.4 0.5 0.6 efficiency (%) output current (a) efficiency 3.3 v out 5v in 4.2v in l=1h c out =2.2f 60 65 70 75 80 85 90 95 100 0 0.1 0.2 0.3 0.4 0.5 0.6 efficiency (%) output current (a) efficiency 2.5v out 4.2v in 3v in l=1h c out =2.2f 3.6v in 40 45 50 55 60 65 70 75 80 85 90 0 0.1 0.2 0.3 0.4 0.5 0.6 efficiency (%) output current (a) efficiency 1.8v out 3.6v in 3v in l=1h c out =2.2f 4.2v in 40 45 50 55 60 65 70 75 80 85 90 0 0.1 0.2 0.3 0.4 0.5 0.6 efficiency (%) output current (a) efficiency 1.5v out 3.6v in 3v in l=1h c out =2.2f 4.2v in 40 45 50 55 60 65 70 75 80 85 90 0 0.1 0.2 0.3 0.4 0.5 0.6 efficiency (%) output current (a) efficiency 1.2v out 4.2v in 3v in l=1h c out =2.2f 3.6v in
micrel, inc. mic2202 march 2007 13 m9999-031907 mic2202bmm with 1h inductor and 2.2f out put capacitor v in mic2202bmm en sync_out vin vsw bias sync_in fb gnd c2 0.01f gnd 2 5 4 3 7 gnd c3 2.2f c1 1f v out 600ma gnd 1 6 10 9 8 l1 1h r1 10k r2 see bom for values gnd figure 7. mic2202bmm schematic bill of materials item part number manufacturer description qty. 06036d105mat2 avx (1) c1 grm185r60j105ke21d murata (2) 1f ceramic capacitor x5r, 6.3v, size 0603 1 0201zd103mat2 avx (1) 10nf ceramic capacitor 6.3v, size 0201 c2 grm033r10j103ka01d murata (2) 10nf ceramic capacitor 6.3v, size 0202 1 06036d225mat2 avx (1) c3 grm033r10j103ka01d murata (2) 2.2f ceramic capacitor x5r, 6.3v, size 0603 1 lqh32cn1r0m53k murata (2) 1h inductor 60m ? (3.2mmx2.5mmx1.55mm) l1 cdrh2d14-2r2 sumida (3) 1.5h inductor 63m ? (3.2mmx3.2mmx1.55mm) 1 r1 crcw04021002f vishay-dale (4) 10k ? 1%, size 0402 1 crcw04021781f 1.78k ? 1%, size 0402 for 3.3v out crcw04022491f 2.49k ? 1%, size 0402 for 2.5v out crcw04023831f 3.83k ? 1%, size 0402 for 1.8v out crcw04024991f 4.99k ? 1%, size 0402 for 1.5v out crcw04027151f 7.15k ? 1%, size 0402 for 1.2v out crcw04021002f vishay-dale (4) 10k ? 1%, size 0402 for 1v out r2 n/a open for 0.5v out 1 u1 mic2202bmm micrel, inc. (5) 2mhz high efficiency synchronous buck regulator 1 notes: 1. avx: www.avx.com 2. murata: www.murata.com 3. sumida: www.sumida.com 4. vishay-dale: www.vishay.com 5. micrel, inc.: www.micrel.com
micrel, inc. mic2202 march 2007 14 m9999-031907 mic2202bmm with 4.7h induct or and 1f output capacitor -30 -20 -10 0 10 20 30 40 50 60 70 -108 -72 -36 0 36 72 108 144 180 216 252 1x10 2 1x10 3 1x10 4 1x10 5 1x10 6 1x10 7 gain (db) phase () frequency (hz) bode plot phase gain 5v in 1.8v out l = 4.7h -30 -20 -10 0 10 20 30 40 50 60 70 -108 -72 -36 0 36 72 108 144 180 216 252 1x10 2 1x10 3 1x10 4 1x10 5 1x10 6 1x10 7 gain (db) phase () frequency (hz) bode plote phase gain 3.6v in 1.8v out l = 4.7h 70 75 80 85 90 95 100 0 0.1 0.2 0.3 0.4 0.5 0.6 efficiency (%) output current (a) efficiency 3.3 v out 5v in l = 4.7h c out =1f 4.2v in 60 65 70 75 80 85 90 95 100 0 0.1 0.2 0.3 0.4 0.5 0.6 efficiency (%) output current (a) efficiency 2.5 v out 4.2v in l = 4.7h c out =1f 3.6v in 3v in 60 65 70 75 80 85 90 95 0 0.1 0.2 0.3 0.4 0.5 0.6 efficiency (%) output current (a) efficiency 1.8v out 3v in l = 4.7h c out =1f 4.2v in 3.6v in 60 65 70 75 80 85 90 95 0 0.1 0.2 0.3 0.4 0.5 0.6 efficiency (%) output current (a) efficiency 1.5v out 3.6v in 3v in l = 4.7h c out =1f 4.2v in 60 65 70 75 80 85 90 95 0 0.1 0.2 0.3 0.4 0.5 0.6 efficiency (%) output current (a) efficiency 1.2v out 4.2v in 3v in l = 4.7h c out =1f 3.6v in
micrel, inc. mic2202 march 2007 15 m9999-031907 mic2202bmm with 4.7h induct or and 1f output capacitor v in mic2202bmm en sync_out vin vsw bias sync_in fb gnd c2 0.01f gnd 2 5 4 3 7 gnd c3 1f c1 1f v out 600ma gnd 1 6 10 9 8 l1 4.7h r1 10k r2 see bom for values gnd figure 8. mic2202bmm schematic bill of materials item part number manufacturer description qty. 06036d105mat2 avx (1) c1, c3 grm185r60j105ke21d murata (2) 1f ceramic capacitor x5r, 6.3v, size 0603 2 0201zd103mat2 avx (1) 10nf ceramic capacitor 6.3v, size 0201 c2 grm033r10j103ka01d murata (2) 10nf ceramic capacitor 6.3v, size 0202 1 lqh32cn4r7m53k murata (2) 4.7h inductor 150m ? (3.2mmx2.5mmx1.55mm) l1 cdrh2d14-4r7 sumida (3) 4.7h inductor 169m ? (3.2mmx3.2mmx1.55mm) 1 r1 crcw04021002f vishay-dale (4) 10k ? 1%, size 0402 1 crcw04021781f 1.78k ? 1%, size 0402 for 3.3v out crcw04022491f 2.49k ? 1%, size 0402 for 2.5v out crcw04023831f 3.83k ? 1%, size 0402 for 1.8v out crcw04024991f 4.99k ? 1%, size 0402 for 1.5v out crcw04027151f 7.15k ? 1%, size 0402 for 1.2v out crcw04021002f vishay-dale (4) 10k ? 1%, size 0402 for 1v out r2 n/a open for 0.5v out 1 u1 mic2202bmm micrel, inc. (5) 2mhz high efficiency synchronous buck regulator 1 notes: 1. avx: www.avx.com 2. murata: www.murata.com 3. sumida: www.sumida.com 4. vishay-dale: www.vishay.com 5. micrel, inc.: www.micrel.com
micrel, inc. mic2202 march 2007 16 m9999-031907 mic2202bmm with 1h inductor and 4.7f out put capacitor -30 -20 -10 0 10 20 30 40 50 60 70 -108 -72 -36 0 36 72 108 144 180 216 252 1x10 2 1x10 3 1x10 4 1x10 5 1x10 6 1x10 7 gain (db) phase() frequency (hz) bode plot phase gain 5v in 1.8v out l=1h -30 -20 -10 0 10 20 30 40 50 60 70 -108 -72 -36 0 36 72 108 144 180 216 252 1x10 2 1x10 3 1x10 4 1x10 5 1x10 6 1x10 7 gain (db) phase () frequency (hz) bode plot phase gain 3.6v in 1.8v out l=1h 50 55 60 65 70 75 80 85 90 95 100 0 0.1 0.2 0.3 0.4 0.5 0.6 efficiency (%) output current (a) efficiency 3.3 v out 5v in l=1h c out =4.7f 4.2v in 60 65 70 75 80 85 90 95 100 0 0.1 0.2 0.3 0.4 0.5 0.6 efficiency (%) output current (a) efficiency 2.5 v out 4.2v in l=1h c out =4.7f 3.6v in 3v in 40 45 50 55 60 65 70 75 80 85 90 0 0.1 0.2 0.3 0.4 0.5 0.6 efficiency (%) output current (a) efficiency 1.8v out 3v in l=1h c out =4.7f 4.2v in 3.6v in 40 45 50 55 60 65 70 75 80 85 90 0 0.1 0.2 0.3 0.4 0.5 0.6 efficiency (%) output current (a) efficiency 1.5 v out 3.6v in 3v in l=1h c out =4.7f 4.2v in 40 45 50 55 60 65 70 75 80 85 90 0 0.1 0.2 0.3 0.4 0.5 0.6 efficiency (%) output current (a) efficiency 1.2v out 4.2v in 3v in l=1h c out =4.7f 3.6v in
micrel, inc. mic2202 march 2007 17 m9999-031907 mic2202bmm with 1h inductor and 4.7f out put capacitor v in mic2202bmm en sync_out vin vsw bias sync_in fb gnd c2 0.01f gnd 2 5 4 3 7 gnd c3 4.7f c1 1f v out 600ma gnd 1 6 10 9 8 l1 1h r1 10k r2 see bom for values gnd figure 9. mic2202bmm schematic bill of materials item part number manufacturer description qty. 06036d105mat2 avx (1) c1 grm185r60j105ke21d murata (2) 1f ceramic capacitor x5r, 6.3v, size 0603 1 0201zd103mat2 avx (1) 10nf ceramic capacitor 6.3v, size 0201 c2 grm033r10j103ka01d murata (2) 10nf ceramic capacitor 6.3v, size 0202 1 06036d475mat2 avx (1) 4.7f ceramic capacitor 4v, size 0201 c3 grm033r10j103ka01d murata (2) 4.7f ceramic capacitor 6.3v, size 0202 1 lqh32cn1r0m53k murata (2) 1h inductor 60m ? (3.2mmx2.5mmx1.55mm) l1 cdrh2d14-1r5 sumida (3) 1.5h inductor 63m ? (3.2mmx3.2mmx1.55mm) 1 r1 crcw04021002f vishay-dale (4) 10k ? 1%, size 0402 1 crcw04021781f 1.78k ? 1%, size 0402 for 3.3v out crcw04022491f 2.49k ? 1%, size 0402 for 2.5v out crcw04023831f 3.83k ? 1%, size 0402 for 1.8v out crcw04024991f 4.99k ? 1%, size 0402 for 1.5v out crcw04027151f 7.15k ? 1%, size 0402 for 1.2v out crcw04021002f vishay-dale (4) 10k ? 1%, size 0402 for 1v out r2 n/a open for 0.5v out 1 u1 mic2202bmm micrel, inc. (5) 2mhz high efficiency synchronous buck regulator 1 notes: 1. avx: www.avx.com 2. murata: www.murata.com 3. sumida: www.sumida.com 4. vishay-dale: www.vishay.com 5. micrel, inc.: www.micrel.com
micrel, inc. mic2202 march 2007 18 m9999-031907 package information 10-pin msop (mm) 10-pin mfl ? (ml)
micrel, inc. mic2202 march 2007 19 m9999-031907 micrel, inc. 2180 fortune drive san jose, ca 95131 usa tel +1 (408) 944-0800 fax +1 (408) 474-1000 web http://www.micrel.com the information furnished by micrel in this data sheet is belie ved to be accurate and reliable. however, no responsibility is a ssumed by micrel for its use. micrel reserves the right to change circuitry and specifications at any time without notification to the customer. micrel products are not designed or authori zed for use as components in life support app liances, devices or systems where malfu nction of a product can reasonably be expected to result in personal injury. life suppo rt devices or systems are devices or systems that (a) are int ended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significan t injury to the user. a purchaser?s use or sale of micrel produc ts for use in life support app liances, devices or systems is a purchaser?s own risk and purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 2004 micrel, incorporated.

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