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mic2225 2mhz 600ma synchronous buck regulator with 300ma ldo 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 february 2008 m9999-022008-d general description the micrel mic2225 is a dual output regulator featuring a high efficiency 2mhz pwm synchronous buck (step-down) regulator and a 300ma ldo. the mic2225 is an ultra-low noise, small size, and high efficiency solution for portable power applications, providing core and i/o supply rails for applications like application processors, camera dsps and multimedia chipsets. in pwm mode, the mic2225 operates with a constant 2mhz frequency. the mic2225 switching regulator operates from 2.7v to 5.5v input and features internal power mosfets that can supply up to 600ma output current in pwm mode. the mic2225 is available in the 10-pin 2mm x 2mm thin mlf ? package with a junction operating range from ?40 c to +125 c. data sheets and support doc umentation can be found on micrel?s web site at: www.micrel.com. features dc-dc converter ? 2.7 to 5.5v supply voltage ? 2mhz pwm mode ? output current to 600ma ? >95% efficiency ? 100% maximum duty cycle ? fixed output voltage option down to 1v ? ultra-fast transient response ? stable with 2.2f ceramic output capacitor ? fully integrated mosfet switches ? micropower shutdown (1ma in shutdown) ? thermal shutdown and current limit protection ? pb-free 10-pin 2mm x 2mm thin mlf ? package ? ?40c to +125c junction temperature range ldo ? v in range 2.7v to 5.5v ? 300ma output current ? output voltage down to 0.8v ? thermal shutdown protection ? current limit protection applications ? cellular phones ? pdas ? usb peripherals ___________________________________________________________________________________________________________ typical application 0 10 20 30 40 50 60 70 80 90 100 0 0.1 0.2 0.3 0.4 0.5 0.6 load current (a) 1.8v efficiency @ 25c 2.7v in 5.5v in 3.6v in
micrel, inc. mic2225 february 2008 2 m9999-022008-d ordering information part number marking code voltage* temperature range package lead finish mic2225-4kymt 4tk 1.2v/2.6v ?40 to +125c 10-pin 2x2 thin mlf ? pb-free MIC2225-4MYMT 4tm 1.2v/2.8v ?40 to +125c 10-pin 2x2 thin mlf ? pb-free mic2225-4oymt 4to 1.2v/2.9v ?40 to +125c 10-pin 2x2 thin mlf ? pb-free mic2225-4symt 4ts 1.2v/3.3v ?40 to +125c 10-pin 2x2 thin mlf ? pb-free mic2225-g4ymt gt4 1.8v/1.2v ?40 to +125c 10-pin 2x2 thin mlf ? pb-free mic2225-gfymt gtf 1.8v/1.5v ?40 to +125c 10-pin 2x2 thin mlf ? pb-free mic2225-gjymt gtj 1.8v/2.5v ?40 to +125c 10-pin 2x2 thin mlf ? pb-free mic2225-gmymt gtm 1.8v/2.8v ?40 to +125c 10-pin 2x2 thin mlf ? pb-free note: mlf? is a green rohs compliant package. lead fi nish is nipdau. mold compound is halogen free. other voltage options available. pl ease contact micrel for details. * refers to nominal output voltage of dc/dc and ldo respectively. pin configuration fb en 5 1 a gnd ldo bias avin 10 pgnd sw vin enldo 9 8 7 2 3 4 6 10-pin 2mm x 2mm thin mlf ? (mt)
micrel, inc. mic2225 february 2008 3 m9999-022008-d pin description pin number pin name pin function 1 agnd analog (signal) ground. 2 ldo ldo output (output): conne ct to a 2.2f output capacitor. 3 bias internal circuit bias supply. must be de-coupled to signal ground with a 0.1f capacitor and should not be loaded. 4 avin analog supply voltage (input): supply vo ltage for the analog control circuitry and ldo input power. requires bypass capacitor to gnd. it must be tied to vin. 5 fb feedback. input to the error amplifier. for the adjustable option, connect to the external resistor divider network to set the output voltage. for fixed output voltage options, connect to v out and an internal resistor network sets the output voltage. 6 en enable (input). logic low will shut down the switching regulator reducing the quiescent current to less than 5a. 7 enldo enable ldo (input): logic low will shut down the ldo, reducing the quiescent current to less than 5a. 8 vin supply voltage (input): supply voltage for the internal switches and drivers. 9 sw switch (output): internal power mosfet output switches. 10 pgnd power ground.
micrel, inc. mic2225 february 2008 4 m9999-022008-d absolute maximum ratings (1) supply voltage (v in ) .......................................................+6v output switch voltage (v sw ) ..........................................+6v output switch current (i sw )..............................................1a logic input voltage (v en ,v lowq )........................ ?0.3v to v in storage temperature (t s ) .........................?60c to +150c esd rating (3) .................................................................. 2kv operating ratings (2) supply voltage (v in )..................................... +2.7v to +5.5v logic input voltage (v en ,v lowq )........................ ?0.3v to v in junction temperature (t j ) ........................ ?40c to +125c junction thermal resistance thin mlf-10l ( ja ) ............................................90c/w electrical characteristics dc/dc (4) v en = v in = 3.6v, l = 2.2h; c outdc/dc = 2.2f, c ldo = 2.2f; i outdc/dc = 100ma; c bias = 0.1f v enldo = 0v; t j = 25c, bold values indicate ?40c < t j < +125c; unless noted. parameter condition min typ max units uvlo threshold rising input voltage during turn-on 2.45 2.55 2.65 v uvlo hysteresis 70 mv switcher ground pin current enldo = 0v, v fb = gnd ; i l =0ma 850 1100 a ldo ground pin current en = 0v 67 110 a ground pin current in shutdown en +enldo = 0v 0.2 5 a over-temperature shutdown 160 c over-temperature shutdown hysteresis 23 c logic low 0.2 v enable input voltage logic high 1.0 v v il < 0.2v 0.1 1 a enable input current v ih > 1.0v 0.1 1 a turn-on time i load = 5ma 50 s fixed output voltages nominal v out tolerance io=50ma ?2 ?3 +2 +3 % % current limit in pwm mode v fb = 0.9*v nom 0.675 0.95 a output voltage line regulation v in = 2.7v to 5.5v, i load = 100ma 0.12 1 % % output voltage load regulation 20ma < i load < 300ma 0.2 1.5 % maximum duty cycle v fb 0.4v 100 % pwm switch on-resistance i sw = 150ma; v fb = 0.7v fb_nom i sw = -150ma; v fb = 1.1v fb_nom 0.4 0.4 ? ? oscillator frequency 1.8 2 2.2 mhz
micrel, inc. mic2225 february 2008 5 m9999-022008-d electrical characteristics ldo (4) c outldo = 2.2f, i outldo = 100a; t j = 25c, bold values indicate ?40c < t j < +125c; unless noted. parameter condition min typ max units input voltage 2.7 5.5 v variation from nominal v out ?2.0 +2.0 % output voltage accuracy variation from nominal v out ; ?40c to +125c ? 3.0 +3.0 % line regulation v in = v out +1v to 5.5v; i out = 100a 0.2 % turn-on time i load = 300ma 30 s load regulation i out = 100a to 300ma @ v in = v out + 1 0.70 % dropout voltage, note 5 i out = 300ma @ v in = 2.7v 210 mv ripple rejection f = 1khz; c out = 2.2f f = 20khz; c out = 2.2f 43 17 db db current limit v out = 0v 400 ma output voltage noise c out = 2.2f, 10hz to 100khz 470 v rms 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 re commended. human body model, 1.5k in series with 100pf. 4. specification for packaged product only. 5. dropout voltage is defined as the input-to-output differentia l at which the output voltage drops 2% below its nominal value that is initially measured at a 1v differential. for outputs below 2.7v, the dropout voltage is the input-to-output voltage differential with a minimum input voltage of 2.7v.
micrel, inc. mic2225 february 2008 6 m9999-022008-d typical characteristics (dc-dc) 0 10 20 30 40 50 60 70 80 90 100 0 0.1 0.2 0.3 0.4 0.5 0.6 load current (a) 1.2v efficiency @ ?40c 2.7v in 5.5v in 3.6v in 0 10 20 30 40 50 60 70 80 90 100 0 0.1 0.2 0.3 0.4 0.5 0.6 load current (a) 1.2v efficiency @ 25c 2.7vin 5.5v in 3.6v in 0 10 20 30 40 50 60 70 80 90 100 0 0.1 0.2 0.3 0.4 0.5 0.6 load current (a) 1.2v efficiency @ 70c 2.7v in 5.5v in 3.6v in 0 25 50 75 100 125 150 2.5 3 3.5 4 4.5 5 5.5 input voltage (v) quiescent current vs. input voltage v out = 1.2v load = 0 enldo = 0v en = v in 0 200 400 600 800 1000 1200 quiescent current vs. load current v out = 1.2v en = v in enldo = 0v 40 60 load current (ma) 30 50 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 2.5 3 3.5 4 4.5 5 5.5 input voltage (v) enable threshold vs. input voltage v out = 1.19v enldo = 5v 0 10 20 30 40 50 60 70 80 90 100 2.5 3 3.5 4 4.5 5 5.5 input voltage (v) turn-on time vs. input voltage v out = 1.19v vldo = 2.8v enldo = 5v 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 2.5 3 3.5 4 4.5 5 5.5 input voltage (v) peak current limit vs. input voltage v out = 1.2v en = enldo = v in 1.5 1.7 1.9 2.1 2.3 2.5 2.7 2.9 2.5 3 3.5 4 4.5 5 5.5 input voltage (v) frequency vs. input voltage v out = 1.2v load = 0 enldo = v in
micrel, inc. mic2225 february 2008 7 m9999-022008-d typical characteristics (ldo) 0 10 20 30 40 50 60 70 100 1k 10k 100k frequency (hz) psrr 10ma 300ma 100ma v in = 1.7v v out = 2.8v c out = 2.2f 0 10 20 30 40 50 60 70 80 90 012345 input voltage (v) quiescent current vs. input voltage enldo = v in 0ma 100ma 60ma 60 62 64 66 68 70 72 74 76 78 80 0.025 0.075 0.125 0.175 0.225 0.275 load current (a) quiescent current vs. load current v in = 3.6v enldo = v in 0 25 50 75 100 125 -40 -20 0 100 temperature (c) 120 20 40 60 80 quiescent current vs. temperature 1ma 100ma 50ma v in = 3.6v enldo = v in 2.50 2.55 2.60 2.65 2.70 2.75 2.80 2.85 2.90 2.95 3.00 0.025 0.075 0.125 0.175 0.225 0.275 load current (a) output voltage vs. load current v in = 3.6v enldo = v in 2.55 2.65 2.75 2.85 2.95 -40 -20 0 100 temperature (c) 120 20 40 60 80 2.50 2.60 2.70 2.80 2.90 3.00 output voltage vs. temperature v in = 3.6v enldo = v in load = 1ma 2.66 2.68 2.72 2.74 2.76 2.78 2.8 2.82 2.84 2.86 2.70 -40 -20 0 100 temperature (c) 120 20 40 60 80 output voltage vs. temperature v in = 3.6v enldo = v in load = 10ma 0 0.02 0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.18 0.20 0 0.05 0.1 0.15 0.2 0.25 0.3 load current (a) dropout voltage vs. load current v in = 3.6v enldo = v in 0 10 20 30 40 50 -40 -20 0 100 temperature (c) 120 20 40 60 80 dropout voltage vs. temperature 1ma 50ma 10ma enldo = v in 25ma 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.5 3 3.5 4 4.5 5 5.5 input voltage (v) peak current limit vs. input voltage en = enldo = v in 0 5 10 15 20 25 30 35 40 45 50 2.5 3 3.5 4 4.5 5 5.5 input voltage (v) turn-on time vs. input voltage enldo = v in 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 2.5 3 3.5 4 4.5 5 5.5 input voltage (v) enable threshold vs. input voltage ldo = 2.8v
micrel, inc. mic2225 february 2008 8 m9999-022008-d typical characteristics (ldo) continued 0 0.5 1.0 1.5 2.0 2.5 3.0 10 frequency (hz) output noise spectral density 100 1k 10k 100k 1m v in = 3.6v v out = 3.3v c out = 2.2f c byp = 0.1f noise(10hz?100khz) = 169v rms
micrel, inc. mic2225 february 2008 9 m9999-022008-d functional characteristics
micrel, inc. mic2225 february 2008 10 m9999-022008-d functional diagram vin avin bias en enldo sw v out1 c out1 fb ldo pgnd enable and control logic pwm control anti-shoot through p-channel current limit 6 ldo current limit sgnd ldo block 1.0v 1.0v soft start bias, uvlo, thermal shutdown hsd lsd n-channel current limit ea ea v out2 c out2 mic2225 block diagram
micrel, inc. mic2225 february 2008 11 m9999-022008-d functional description vin vin provides power to the mosfets for the switch mode regulator section, al ong with the current limiting sensing. due to the high switching speeds, it is recommended that an 1f capacitor be placed close to vin and the power ground (pgnd) pin for bypassing. please refer to layout recommendations. avin analog vin (avin) provides power to the ldo section and the bias through an internal 6 ? resistor. 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. ldo the ldo pin is the output of the linear regulator and needs to be connected to a 2.2f output capacitor. en the enable pin provides a l ogic level control of the output. in the off state, the su pply current of the device is greatly reduced (typically <1a ). also, in the off state, the output drive is placed in a "tri-stated" condition, wherein 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. enldo the enable pin provides a logic level control of the ldo output. in the off state, suppl y current of the device is greatly reduced (typically <1 a). do not drive the enable pin above the supply voltage. bias the bias pin supplies the power to the internal power to the control and reference circuitry. the bias is powered from avin through an internal 6 ? resistor. a small 0.1f capacitor is recommended for bypassing. fb the feedback pin (fb) prov ides the control path to control the output. for fixed output, the controller output is directly connected to the feedback (fb) pin. sw the switch (sw) pin connects directly to the inductor and provides the switching current necessary to operate in pwm mode. due to the high speed switching on this pin, the switch node should be routed away from sensitive nodes. pgnd power ground (pgnd) is the ground path for the high current 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 considerations for more details. sgnd signal ground (sgnd) 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 lay out considerations for more details.
micrel, inc. mic2225 february 2008 12 m9999-022008-d application information the mic2225 is a 600ma pwm and 300ma ldo dual power supply. both pwm output and ldo outputs are independent and are controll ed by en and enldo pins respectively. these enable pins are logic level compatible. 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 dielectrics loose most of their capacitance over tem perature and are therefore, not recommended. a minimum 1f is recommended for placement close to the vin and pgnd pins for high frequency filtering. smaller case size capacitors are recommended due to their lower esr and esl. please refer to layout recommendations for proper layout of the input capacitor. output capacitor even though the mic2225 is optimized for a 2.2f output capacitor, output capac itance can be varied from 1f to 10f. the mic2225 utilizes type iii internal compensation and utilizes an internal high frequency zero to compensate for the double pole roll off of the lc filter. for this reason, larger output capacitors can create instabilities. x5r or x7r di electrics are recommended for the output capacitor. y5v dielectrics lose most of their capacitance over tem perature and are therefore, not recommended. in addition to a 2.2f, a small 10nf is recommended close to the load for high frequency filtering. smaller case size capacitors are recommended due to there lower esr and esl. inductor selection the mic2225 is designed for use with a 2.2h inductor. proper selection should ensur e that the inductor can handle the maximum average and peak currents required by the load. maximum current ratings for 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 that the inductor selected can handle the maximum operating current. when saturation current is specified, make sure that there is enough margin so that the peak current will not saturate the inductor. peak inductor current can be calculated as follows: l f 2 v v 1 v i i in out out out pk ? ? ? ? ? ? ? ? ? + =
micrel, inc. mic2225 february 2008 13 m9999-022008-d pcb layout recommendations top layer bottom layer note: the above figures demonstrate the recommended layout for the mic2225 fixed output option.
micrel, inc. mic2225 february 2008 14 m9999-022008-d j3 vo1 mic2225 j5 gnd j1 v in 5.5v max j2 gnd vin avin sw fb enldo en ldo pgnd bias agnd c4 2.2f/ 6.3v c3 2.2f/ 6.3v r3 0 c2 0.1f/ 6.3v l1 0.47h / 2.2h 8 4 6 7 3 10 1 2 5 9 j6 en r1 10k j7 enldo c1 2.2f/ 6.3v j4 vo2 r2 10k jp1 1x2 21 schematic diagram bill of materials item part number manufacturer description qty. c1 c1608x5r0j225k tdk (1) 2.2f/6.3v, x5r 1 c2 vj0402y104kxqcw1bc vishay vitramon (2) 0.1f/6.3v, x7r 1 c3 c1608x5r0j225k tdk (1) 2.2f/6.3v, x5r 1 c4 c1608x5r0j225k tdk (1) 2.2f/6.3v, x5r 1 r1 crcw06031002fkeye3 vishay dale (2) 10k, 0603, 1/16w, 1% 1 r2 crcw06031002fkeye3 vishay dale (2) 10k, 0603, 1/16w, 1% 1 r3 crcw08050000fkeye3 vishay dale (2) 0, 0805, 1/8w, 1% 1 l1 cdrh2d11/hpnp-2r2nc sumida (3) 2.2h, 1.1a (isat) 1 u1 mic2225-xymt micrel, inc. (4) 2mhz pwm synchronous buck regulator with 300ma ldo 1 notes: 1. tdk: www.tdk.com 2. vishay: www.vishay.com 3. sumida: www.sumida.com 4. micrel, inc.: www.micrel.com
micrel, inc. mic2225 february 2008 15 m9999-022008-d package information 10-pin 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 can reasonably be expected to result in personal injury. life suppo rt devices or systems are devices or systems that (a) are in tended 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. ? 2007 micrel, incorporated.

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