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mic23250 4mhz dual 400ma synchronous buck regulator with hyperlight load? hyperlight load is a trademark of micrel, inc. 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 general description the mic23250 is a high efficiency 4mhz dual 400ma synchronous buck regulator wi th hyperlight load? mode. hyperlight load? provides very high efficiency at light loads and ultra-fast transient response which is perfectly suited for supplying processor core voltages. an additional benefit of this proprietary architecture is very low output ripple voltage throughout the entire load range with the use of small output capacitors. the fixed output mic23250 has a tiny 2mm x 2mm thin mlf ? package that saves precious board space by requiring only 6 additional external components to drive both outputs up to 400ma each. the device is designed for use with a 1h inductor and a 4.7f output capacitor that enables a sub-1mm height. the mic23250 has a very low quiescent current of 33a with both outputs enabled and can achieve over 85% efficiency at 1ma. at higher loads the mic23250 provides a constant switching frequency around 4mhz while providing peak efficiencies up to 94%. the mic23250 fixed output voltage option is available in a 10-pin 2mm x 2mm thin mlf ? . the adjustable output options is available in a 12-pin 2.5mm x 2.5mm thin mlf ? . the mic23250 is designed to operate over the junction operating range from C40 c to +125 c. data sheets and support documentation can be found on micrels web site at: www.micrel.com . features ? input voltage: 2.7v to 5.5v hyperlight load? ? dual output current 400ma/400ma ? up to 94% peak efficiency and 85% efficiency at 1ma ? 33a dual quiescent current ? 1h inductor with a 4.7f capacitor ? 4mhz in pwm operation ? ultra fast transient response ? low voltage output ripple ? 20mvpp in hyperlight load? mode ? 3mv output voltage ripple in full pwm mode ? 0.01a shutdown current ? fixed output:10-pin 2mm x 2mm thin mlf? ? adjustable output:12-pin 2.5mm x 2.5mm thin mlf? ? C40 c to +125 c junction temperature range applications ? mobile handsets ? portable media players ? portable navigation devices (gps) ? wifi/wimax/wibro modules ? digital cameras ? wireless lan cards ? usb powered devices ____________________________________________________________________________________________________________ typical application 0 10 20 30 40 50 60 70 80 90 100 11 0 100 1000 output current (ma) efficiency v out = 1.8v l = 1hc out = 4.7f vin = 3.0v vin = 2.7v vin = 3.6v vin = 4.2v june 2010 m9999-061110-e downloaded from: http:///
micrel, inc. mic23250 june 2010 2 m9999-061110-e ordering information part number marking code nominal output voltage 1 nominal output voltage 2 junction temp. range package lead finish mic23250-3bymt wv3 0.9v 1.1v C40 to +125c 10-pin 2mm x 2mm thin mlf ? pb-free mic23250-c4ymt wv2 1.2v 1.0v C40 to +125c 10-pin 2mm x 2mm thin mlf ? pb-free mic23250-w4ymt wv4 1.2v 1.6v C40 to +125c 10-pin 2mm x 2mm thin mlf ? pb-free mic23250-g4ymt wv5 1.2v 1.8v C40 to +125c 10-pin 2mm x 2mm thin mlf ? pb-free mic23250-s4ymt 1wv 1.2v 3.3v C40 to +125c 10-pin 2mm x 2mm thin mlf ? pb-free mic23250-gfhymt wv1 1.575v 1.8v C40 to +125c 10-pin 2mm x 2mm thin mlf ? pb-free mic23250-skymt 5wv 2.6v 3.3v C40 to +125c 10-pin 2mm x 2mm thin mlf ? pb-free mic23250-aaymt 4wv adj adj C40 to +125c 12-pin 2.5mm x 2.5mm thin mlf ? pb-free notes: 1) additional voltage options available (0.8 v to 3.3v). contact micrel for details. 2) thin mlf ? is green rohs compliant package. lead finish is nipdau. mold compound is halogen free. downloaded from: http:///
micrel, inc. mic23250 june 2010 3 m9999-061110-e pin configuration pgnd vin 5 1 sns1 en1 a gnd sw1 10 sns2 en2 avin sw2 98 7 23 4 6 sw1 sw2 5 1 fb1 sns1 en1 a gnd 12 fb2 sns2en2 avin 1110 9 23 4 8 pgnd vin 6 7 10-pin 2mm x 2mm thin mlf ? (mt) fixed output (top view) 12-pin 2.5mmx2.5mm thin mlf ? (mt) adjustable output (top view) pin description pin number (fixed) pin number (adjustable) pin name pin function C 1 fb1 feedback vout1 (input): connect resistor divider at this node to set output voltage. resistors should be sele cted based on a nominal vfb of 0.72v. 1 2 sns1 sense 1 (input): error amplifier inpu t. connect to feedback resistor network to set output 1 voltage. 2 3 en1 enable 1 (input): logic low will shut down output 1. logic high powers up output 1. do not leave unconnected. 3 4 agnd analog ground. must be connected externally to pgnd. 4 5 sw1 switch node 1 (output): internal power mosfet output. 5 6 pgnd power ground. 6 7 vin supply voltage (power input): requires close bypass capacitor to pgnd. 7 8 sw2 switch node 2 (output): internal power mosfet output. 8 9 avin supply voltage (power input): analog control circuitry. connect to vin. 9 10 en2 enable 2 (input): logic low will shut down output 2. logic high powers up output 2. do not leave unconnected. 10 11 sns2 sense 2 (input): error amplifier inpu t. connect to feedback resistor network to set output 2 voltage. C 12 fb2 feedback vout2 (input): connect resistor divider at this node to set output voltage. resistors should be sele cted based on a nominal vfb of 0.72v. downloaded from: http:///
micrel, inc. mic23250 june 2010 4 m9999-061110-e absolute maximum ratings (1) supply voltage (v in ) .........................................................6v output switch voltage (v sw ) ............................................6v logic input voltage (v en1 , v en2 ) ........................ C0.3v to v in storage temperature range (t s )..............C65c to +150c esd rating (3) .................................................................. 2kv operating ratings (2) supply voltage (v in )......................................... 2.7v to 5.5v logic input voltage (v en1 , v en2 ) ............................. 0v to v in junction temperature (t j ) ..................C40c t j +125c thermal resistance 2mm x 2mm thin mlf-10 ( ja ) .........................70c/w 2.5mm x 2.5mm thin mlf-12 ( ja ) ...................65c/w electrical characteristics (4) t a = 25c with v in = v en1 = v en2 = 3.6v; l = 1h; c out = 4.7f; i out = 20ma; only one channel power is enabled, unless otherwise specified. bold values indicate C40c < t j < +125c. parameter condition min typ max units under-voltage lockout threshold (turn-on) 2.45 2.55 2.65 v uvlo hysteresis 60 mv quiescent current v out1, 2 (both enabled) , i out1, 2 = 0ma , v sns1,2 >1.2 * v out1, 2 nominal 33 50 a shutdown current v en1, 2 = 0v; v in = 5.5v 0.01 4 a v in = 3.6v if v outnom < 2.5v, i load = 20ma C2.5 +2.5 % output voltage accuracy v in = 4.5v if v outnom 2.5v, i load = 20ma C2.5 +2.5 % feedback voltage (adj only) 0.720 v current limit in pwm mode sns = 0.9*v out nom 0.410 0.65 1 a v in = 3.6v to 5.5v if v outnom < 2.5v, i load = 20ma 0.4 %/v output voltage line regulation v in = 4.5v to 5.5v if v outnom 2.5v, i load = 20ma 0.4 %/v 20ma < i load < 400ma, v in = 3.6v if v outnom < 2.5v 0.5 % output voltage load regulation 20ma < i load < 400ma, v in = 5.0v if v outnom 2.5v 0.5 % pwm switch on-resistance i sw = 100ma pmos i sw = -100ma nmos 0.6 0.8 ? ? frequency i load = 120ma 4 mhz soft start time v out = 90% 260 s enable threshold 0.5 0.8 1.2 v enable input current 0.1 2 a over-temperature shutdown 160 c over-temperature shutdown hysteresis 40 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. devices are esd sensitive. handling precautions recommended. human body model: 1.5k ? in series with 100pf. 4. specification for packaged product only. downloaded from: http:///
micrel, inc. mic23250 june 2010 5 m9999-061110-e typical characteristics 0 5 10 15 20 25 30 35 40 45 50 2.7 input voltage (v) quiescent current vs. input voltage 3.2 3.7 4.2 4.7 5.2 5.7 l = 1hc out = 4.7f 0.01 0.1 1 10 11 0 100 1000 output current (ma) switching frequency vs. output current v out = 1.8v l = 1hc out = 4.7f v in = 3.6v v in = 3.0v 0.01 0.1 1 10 11 0 100 1000 output current (ma) switching frequency vs. output current v in = 3.6v v out = 1.8v c out = 4.7f l = 2.2h l = 1h l = 4.7h 4mhz 4mhz v in = 4.2v 3.0 3.5 4.0 4.5 5.0 frequency vs. temperature 20 40 60 80 temperature (c) l = 1hc out = 4.7f load = 120ma 1.70 1.72 1.74 1.76 1.78 1.80 1.82 1.84 1.86 1.88 1.90 11 0 100 1000 output current (ma) vin = 3.6v vin = 3.0v output voltage vs. output current 1.72 1.74 1.76 1.78 1.82 1.84 1.86 1.88 2.7 1.70 1.80 1.90 input voltage (v) output voltage vs. input voltage 3.2 3.7 4.2 4.7 5.2 5.7 l = 1hc out = 4.7f load = 300ma load = 1ma load = 10ma vin = 4.2v load = 150ma load = 50ma load = 400ma 1.5 1.6 1.7 1.9 output voltage vs. temperature 20 40 60 80 temperature (c) l = 1hc out = 4.7f load = 120ma 1.8 vout1 = 1.575v vout2 = 1.8v 0 0.2 0.4 0.6 0.8 1.2 enable threshold vs. temperature 20 40 60 80 temperature (c) l = 1hc out = 4.7f 1.0 vin = 3.6v vin = 2.7v vin = 5.5v 0.800 0.825 0.850 0.875 0.900 0.925 0.950 0.975 1.000 2.7 input voltage (v) enable threshold vs. input voltage 3.2 3.7 4.2 4.7 5.2 5.7 v in = 3.6v v out = 1.8v load = 150ma enable off enable on 550 600 650 700 2.7 input voltage (v) current limit vs. input voltage 3.2 3.7 4.2 4.7 5.2 5.7 l = 1hc out = 4.7f 0 10 20 30 40 50 60 70 80 90 100 11 0 100 1000 output current (ma) efficiency v out = 1.2v l = 1hc out = 4.7f vin = 3.0v 0 10 20 30 40 50 60 70 80 90 100 11 0 100 1000 output current (ma) efficiency v out = 1.575v l = 1hc out = 4.7f vin = 3.0v vin = 2.7v vin = 2.7v vin = 3.6v vin = 4.2v vin = 3.6v vin = 4.2v downloaded from: http:///
micrel, inc. mic23250 june 2010 6 m9999-061110-e typical characteristics (continued) 0 10 20 30 40 50 60 70 80 90 100 11 0 100 1000 output current (ma) efficiency v out = 1.8v l = 1hc out = 4.7f vin = 3.0v vin = 2.7v 0 10 20 30 40 50 60 70 80 90 100 11 0 100 1000 output current (ma) efficiency v out = 2.5v l = 1hc out = 4.7f vin = 3.0v 0 10 20 30 40 50 60 70 80 90 100 11 0 100 1000 output current (ma) efficiency v out = 3.3v l = 1hc out = 4.7f vin = 5.0v vin = 2.7v vin = 4.2v vin = 3.6v vin = 4.2v vin = 3.6v vin = 4.2v vin = 5.5v 0 10 20 30 40 50 60 70 80 90 100 11 0 100 1000 output current (ma) efficiency v out = 1.8v v in = 3.6v c out = 4.7f l = 1.0h l = 1.5h 0 10 20 30 40 50 60 70 80 90 100 11 0 100 1000 output current (ma) dual output efficiency vin = 3.6v vin = 3.3v with various inductors l = 0.47h vin = 4.2v v out1 = 1.575v v out2 = 1.8v load1 = load2l1 = l2 = 1h c out1 = c out2 = 4.7f downloaded from: http:///
micrel, inc. mic23250 june 2010 7 m9999-061110-e functional characteristics downloaded from: http:///
micrel, inc. mic23250 june 2010 8 m9999-061110-e functional characteristics (continued) downloaded from: http:///
micrel, inc. mic23250 june 2010 9 m9999-061110-e functional characteristics (continued) downloaded from: http:///
micrel, inc. mic23250 june 2010 10 m9999-061110-e functional diagram mic23250 simplified fixed output block diagram i sense current limit current limit zero x zero x enable logic gate drives control logic t on timer & soft start error comparator av in v in en1 en2 sw2 sw1 fb2 fb1 pgnd agnd enable logic gate drives control logic t on timer & soft start i sense error comparator uvlo uvlo + - + - ref2 ref1 sns1 sns2 mic23250 simplified adjustable output block diagram downloaded from: http:///
micrel, inc. mic23250 june 2010 11 m9999-061110-e functional description vin the vin provides power to the internal mosfets for the switch mode regulator along with the current limit sensing. the vin operating range is 2.7v to 5.5v so an input capacitor with a minimum of 6.3v voltage rating is recommended. due to the high switching speed, a minimum of 2.2f bypass capacitor placed close to vin and the power ground (pgnd) pin is required. based upon size, performance and cost, a tdk c1608x5r0j475k, size 0603, 4.7f ceramic capacitor is highly recommended for most applications. refer to the layout recommendations for details. avin the analog vin (avin) provides power to the analog supply circuitry. avin and vin must be tied together. careful layout should be considered to ensure high frequency switching noise caused by vin is reduced before reaching avin. a 0.01f bypass capacitor placed as close to avin as possible is recommended. see layout recommendations for details. en1/en2 the enable pins (en1 and en2) control the on and off states of outputs 1 and 2, respectively. a logic high signal on the enable pin activates the output voltage of the device. a logic low signal on each enable pin deactivates the output. mic23250 features built-in soft-start circuitry that reduces in-rush curr ent and prevents the output voltage from overshooting at start up. sw1/sw2 the switching pin (sw1 or sw2) connects directly to one end of the inductor (l1 or l2) and provides the current path during switching cycles. the other end of the inductor is connected to the load and sns pin. due to the high speed switching on this pin, the switch node should be routed away from sensitive nodes. sns1/sns2 the sns pin (sns1 or sns2) is connected to the output of the device to provide feedback to the control circuitry. a minimum of 2.2f bypass capacitor should be connected in shunt with each output. based upon size, performance and cost, a tdk c1608x5r0j475k, size 0603, 4.7f ceramic capacitor is highly recommended for most applications. in order to reduce parasitic inductance, it is good practice to place the output bypass capacitor as close to the inductor as possible. the sns connection should be placed close to the output bypass capacitor. refer to the layout recommendations for more details. pgnd the power ground (pgnd) is the ground path for the high current in pwm mode. the current loop for the power ground should be as small as possible and separate from the analog ground (agnd) loop. refer to the layout recommendations for more details. agnd the signal ground (agnd) is the ground path for the biasing and control circuitry. the current loop for the signal ground should be separate from the power ground (pgnd) loop. refer to the layout recommendations for more details. fb1/fb2 (adjustable output only) the feedback pins (fb1/fb2) are two extra pins that can only be found on the mic23250 -aaymt devices. it allows the regulated output voltage to be set by applying an external resistor network. the internal reference voltage is 0.72v and the recommended value of r bottom is within 10% of 442k . the r top resistor is the resistor from the fb pin to the output of the device and r bottom is the resistor from the fb pin to ground. the output voltage is calculated from the equation below. see compensation under the applications information section for recommended feedback component values. ? ?? ? ? ?? ? + = 1 72.0 bottom top out r r v v downloaded from: http:///
micrel, inc. mic23250 june 2010 12 m9999-061110-e applications information the mic23250 is designed for high performance with a small solution size. with a dual 400ma output inside a tiny 2mm x 2mm thin mlf ? package and requiring only six external components, t he mic23250 meets todays miniature portable electronic device needs. while small solution size is one of its ad vantages, the mic23250 is big in performance. using the hyperlight load? switching scheme, the mic23250 is able to maintain high efficiency throughout the entire load range while providing ultra-fast load transient response. even with all the given benefits, the mic23250 can be as easy to use as linear regulators. the following sections provide an over view of implementing mic23250 into related applications input capacitor a minimum of 2.2f ceramic capacitor should be placed close to the vin pin and pgnd pin for bypassing. a tdk c1608x5r0j475k, size 0603, 4.7f ceramic capacitor is recommended based upon performance, size and cost. a x5r or x7r temperature rating is recommended for the input capacitor. y5v temperature rating capacitors, aside from losing most of their capacitance over temperature, can also become resistive at high frequencies. this reduces their ability to filt er out high frequency noise. output capacitor the mic23250 was designed for use with a 2.2f or greater ceramic output capaci tor. increasing the output capacitance will lower output ripple and improve load transient response but could increase solution size or cost. a low equivalent series resistance (esr) ceramic output capacitor such as the tdk c1608x5r0j475k, size 0603, 4.7f ceramic capacitor is recommended based upon performance, size and cost. either the x7r or x5r temperature rating capacitors are recommended. the y5v and z5u temperature rating capacitors, aside from the undesirable effect of their wide variation in capacitance over temperature, become resistive at high frequencies. inductor selection inductor selection will be determined by the following (not necessarily in the order of importance); ? inductance ? rated current value ? size requirements ? dc resistance (dcr) the mic23250 was designed for use with an inductance range from 0.47h to 4.7h. typically, a 1h inductor is recommended for a balance of transient response, efficiency and output ripple. for faster transient response a 0.47h inductor may be used. for lower output ripple, a 4.7h is recommended. maximum current ratings of the inductor are generally given in two methods; permissible dc current and saturation current. permissible dc current can be rated either for a 40c temperature rise or a 10% to 20% loss in inductance. ensure the inductor selected can handle the maximum operating current. when saturation current is specified, make sure that t here is enough margin so that the peak current of the induct or does not cause it to saturate. peak current can be calculated as follows: ?? ? ?? ? ? ?? ? ? ?? ? ? + = l f v v v i i in out out out peak 2 / 1 as shown by the previous ca lculation, the peak inductor current is inversely proportional to the switching frequency and the inductance; the lower the switching frequency or the inductance the higher the peak current. as input voltage increases the peak current also increases. the size of the inductor depends on the requirements of the application. refer to the application circuit and bill of material for details. dc resistance (dcr) is al so important. while dcr is inversely proportional to size, dcr can represent a significant efficiency loss. refer to the efficiency considerations. compensation the mic23250 is designed to be stable with a 0.47h to 4.7h inductor with a minimum of 2.2f ceramic (x5r) output capacitor. for the adjustable mic23250, the total feedback resistance should be kept around 1m ? to reduce current loss down the feedback resistor network. this helps to improve efficiency. a feed-forward capacitor (cff) of 120pf must be used in conjunction with the external feedback resistors to reduce the effects of parasitic capacitance that is inherent of most circuit board layouts. figure 1 and table 1 shows the recommended feedback resistor values along with the recommended feed-forward capacitor values for the mic23250 adjustable device. r top r bottom c ff figure 1. feedback resistor network downloaded from: http:///
micrel, inc. mic23250 june 2010 13 m9999-061110-e v out (v) r top (k ? ) r bottom (k ? ) cff (pf) 0.8 49 442 120 0.9 111 442 120 1 172 442 120 1.1 233 442 120 1.2 295 442 120 1.3 356 442 120 1.4 417 442 120 1.5 479 442 120 1.6 540 442 120 1.7 602 442 120 1.8 663 442 120 1.9 724 442 120 2 786 442 120 2.1 847 442 120 2.2 909 442 120 2.3 970 442 120 2.4 1031 442 120 2.5 1093 442 120 2.6 1154 442 120 2.7 1216 442 120 2.8 1277 442 120 2.9 1338 442 120 3 1400 442 120 3.1 1461 442 120 3.2 1522 442 120 3.3 1584 442 120 table 1. recommended fe edback component values efficiency considerations efficiency is defined as the am ount of useful output power, divided by the amount of power supplied. 100 % ? ?? ? ? ?? ? = in in out out i v i v efficiency maintaining high efficiency serves two purposes. it reduces power dissipation in the power supply, reducing the need for heat sinks and ther mal design considerations and it reduces consumption of current for battery powered applications. reduced current draw from a battery increases the devices operating time and is critical in hand held devices. there are two types of losses 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 r dson multiplied by the switch current squared. 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 re quired driving the gates on and off at a constant 4mhz frequency and the switching transitions make up the switching losses. 0 20 40 60 80 100 0.1 11 0 100 1000 load (ma) efficiency v out = 1.8v v out = 1.8v l = 1h v in = 3.3v v in = 2.7v v in = 3.6v the figure above shows an efficiency curve. from no load to 100ma, efficiency losses are dominated by quiescent current losses, gate drive and transition losses. by using the hyperlight load? mode the mic23250 is able to maintain high efficiency at low output currents. over 100ma, efficiency loss is dominated by mosfet r dson and inductor losses. higher input supply voltages will increase the gate-to-sour ce threshold on the internal mosfets, thereby reducing the internal r dson . this improves efficiency by reducing dc losses in the device. all but the inductor 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: dcr loss = i out 2 dcr from that, the loss in efficiency due to inductor resistance can be calculated as follows: 100 _ 1 ?? ? ?? ? ? ?? ? ? ?? ? + ? = d out out out out p l i v i v loss efficiency efficiency loss due to dcr is minimal at light loads and gains significance as the load is increased. inductor selection becomes a trade-off between efficiency and size in this case. downloaded from: http:///
micrel, inc. mic23250 june 2010 14 m9999-061110-e as shown in the previous equation, the load at which mic23250 transitions from hyperlight load? mode to pwm mode is a function of the input voltage (v in ), output voltage (v out ), duty cycle (d), inductance (l) and frequency (f). this is illustrated in the graph below. since the inductance range of mic23250 is from 0.47h to 4.7h, the device may then be tailored to enter hyperlight load? mode or pwm mode at a specific load current by selecting the appropriate inductance. for example, in the graph below, when the inductance is 4.7h the mic23250 will transition into pwm mode at a load of approximately 5ma. under the same condition, when the inductance is 1h, the mic23250 will transition into pwm mode at approximately 70ma. hyperlight load mode? the mic23250 uses a minimum on and off time proprietary control loop (pat ented by micrel). when the output voltage falls below the regulation threshold, the error comparator begins a switching cycle that turns the pmos on and keeps it on for the duration of the minimum- on-time. this increases the output voltage. if the output voltage is over the regulation threshold, then the error comparator turns the pmos off for a minimum-off-time until the output drops below the threshold. the nmos acts as an ideal rectifier that conducts when the pmos is off. using a nmos switch instead of a diode allows for lower voltage drop across the switchi ng device when it is on. the asynchronous switching combination between the pmos and the nmos allows the control loop to work in discontinuous mode for light load operations. in discontinuous mode, the mic23250 works in pulse frequency modulation (pfm) to regulate the output. as the output current increases, the off-time decreases, thus providing more energy to the output. this switching scheme improves the efficiency of mic23250 during light load currents by only switching when it is needed. as the load current increases, the mic23250 goes into continuous conduction mode (ccm) and switches at a frequency centered at 4mhz. the equation to calculate the load when the mic23250 goes into continuous conduction mode may be approximated by the following formula: 0.01 0.1 1 10 11 0 100 1000 output current (ma) switching frequency vs. output current v in = 3.6v v out = 1.8v c out = 4.7f l = 2.2h l = 1h l = 4.7h 4mhz () ? ?? ? ? ?? ? ? > f l d v v i out in load 2 downloaded from: http:///
micrel, inc. mic23250 june 2010 15 m9999-061110-e mic23250 typical application circuit (fixed output) bill of materials item part number manufacturer description qty c1, c2, c3 c1608x5r0j475k tdk (1) 4.7f ceramic capacitor, 6.3v, x5r, size 0603 3 c4 vj0603y103kxxat vishay (2) 0.01f ceramic capacitor, 25v, x7r, size 0603 1 r1, r2 crcw06031002fkea vishay (2) 10k ? , 1%, 1/16w, size 0603 optional lqm21pn1r0mc0d murata (3) 1h, 0.8a, 190m ? , l2mm x w1.25mm x h0.5mm lqh32cn1r0m33 murata (3) 1h, 1a, 60m ? , l3.2mm x w2.5mm x h2.0mm lqm31pn1r0m00 murata (3) 1h, 1.2a, 120m ? , l3.2mm x w1.6mm x h0.95mm glf251812t1r0m tdk (1) 1h, 0.8a, 100m ? , l2.5mm x w1.8mm x h1.35mm lqm31pnr47m00 murata (3) 0.47h, 1.4a, 80m ? , l3.2mm x w1.6mm x h0.85mm mipf2520d1r5 fdk (4) 1.5h, 1.5a, 70m ? , l2.5mm x w2mm x h1.0mm l1, l2 epl2010-102 coilcraft (5) 1.0h, 1.0a, 86m ? , l2.0mm x w1.8mm x h1.0mm 2 u1 mic23250-xxymt micrel, inc. (6) 4mhz dual 400ma fixed output buck regulator with hyperlight load? mode 1 notes: 1. tdk: www.tdk.com . 2. vishay: www.vishay.com . 3. murata: www.murata.com . 4. fdk: www.fdk.co.jp . 5. coilcraft: www.coilcraft.com . 6. micrel, inc: www.micrel.com . downloaded from: http:///
micrel, inc. mic23250 june 2010 16 m9999-061110-e pcb layout recommendations (fixed output) top layer bottom layer downloaded from: http:///
micrel, inc. mic23250 june 2010 17 m9999-061110-e mic23250 typical application circuit (adjustable output) bill of materials item part number manufacturer description qty c1, c2, c3 c1608x5r0j475k tdk (1) 4.7f ceramic capacitor, 6.3v, x5r, size 0603 3 c4 vj0603y103kxxat vishay (2) 0.01f ceramic capacitor, 25v, x7r, size 0603 1 c5, c6 vj0603y121kxaat vishay (2) 120pf ceramic capacitor, 50v, x7r, size 0603 2 r1, r2 crcw06031002fkea vishay (2) 10k ? , 1%, 1/16w, size 0603 optional r3, r5 crcw06036653fkea vishay (2) 665k ? , 1%, 1/16w, size 0603 2 r4, r6 crcw06034423fkea vishay (2) 442k ? , 1%, 1/16w, size 0603 2 lqm21pn1r0mc0d murata (3) 1h, 0.8a, 190m ? , l2mm x w1.25mm x h0.5mm lqh32cn1r0m33 murata (3) 1h, 1a, 60m ? , l3.2mm x w2.5mm x h2.0mm lqm31pn1r0m00 murata (3) 1h, 1.2a, 120m ? , l3.2mm x w1.6mm x h0.95mm glf251812t1r0m tdk (1) 1h, 0.8a, 100m ? , l2.5mm x w1.8mm x h1.35mm lqm31pnr47m00 murata (3) 0.47h, 1.4a, 80m ? , l3.2mm x w1.6mm x h0.85mm mipf2520d1r5 fdk (4) 1.5h, 1.5a, 70m ? , l2.5mm x w2mm x h1.0mm l1, l2 epl2010-102 coilcraft (5) 1.0h, 1.0a, 86m ? , l2.0mm x w1.8mm x h1.0mm 2 u1 mic23250-aaymt micrel, inc. (6) 4mhz dual 400ma adjustable output buck regulator with hyperlight load? mode 1 notes: 1. tdk: www.tdk.com . 2. vishay: www.vishay.com . 3. murata: www.murata.com . 4. fdk: www.fdk.co.jp . 5. coilcraft: www.coilcraft.com . 6. micrel, inc: www.micrel.com . downloaded from: http:///
micrel, inc. mic23250 june 2010 18 m9999-061110-e pcb layout recommendations (adjustable output) top layer bottom layer downloaded from: http:///
micrel, inc. mic23250 june 2010 19 m9999-061110-e package information (fixed output) 10-pin 2mm x 2mm thin mlf ? (mt) downloaded from: http:///
micrel, inc. mic23250 june 2010 20 m9999-061110-e package information (adjustable output) 12-pin 2.5mm x 2.5mm thin mlf ? (mt) 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 reasonably be expected to result in pers onal injury. life support devices or system s are devices or systems that (a) are in tended for surgical impla 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 purchasers use or sale of micrel produc ts for use in life support app liances, devices or systems is a purchasers own risk and purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. can nt ? 2007 micrel, incorporated. downloaded from: http:///

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