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mic2807 rf pa power management ic 2mhz, 600ma dc/dc w/dac input and bypass switch, dual low noise 200ma/30ma ldo regulators mlf and micro leadframe are registered trademarks of amkor technology, inc. micrel inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? te l +1 (408) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micre l.com february 2008 m9999-022008-b general description the mic2807 integrates a high performance 600ma dc/dc converter intended for powering a power amplifier (pa) in a mobile phone with dual low noise low dropout (ldo) regulators for the rest of the rf section. optimized for low noise performance, the mic2807 improves efficiency in the handset wi thout compromising quality. the mic2807 has a 2mhz, constant frequency pulse width modulated (pwm) dc/dc converter designed for low noise operation and high e fficiency. the output voltage (v out ) is variable from 0.3v to the input voltage (v in ), adjustable from 0.3v to 3.6v through a dac input when v in > v out . the converter will work in a 100% duty cycle mode to offer maximum power and efficiency in the application. in addition to 100% duty cycle, the dc/dc converter has a bypass mode of operation where the input voltage node (pvin pin) is shorted to the output voltage node (out pin) through a 95m ? switch. the integrated dual low noise low dropout regulators are optimized for high psrr capability and fast turn-on times. the constant frequency dc/dc converter along with dual low noise ldo regulators enables a very quiet and efficient solution for mobile applications. the mic2807 is a cap design, operating with small ceramic output capacitors and inductors for stability, reducing required board spac e and component cost and it is available in the tiny 2.5mm x 2.8mm mlf ? package. data sheets and support doc umentation can be found on micrel?s web site at: www.micrel.com. features ? 2.7v to 5.5v input voltage range ? stable with ceramic output capacitors ? tiny 17-pin 2.5mm x 2.8mm mlf ? package ? thermal shutdown protection ? current limit protection rf pa power supply dc/dc converter ? adjustable output power supply ? dac controlled ? v out = v dac x 3 ? bypass mode operation ? internal 95m ? switch between pvin and out pins ? v dac > 1.2v ? up to 600ma output current in pwm mode ? 100% duty cycle operation for maximum efficiency ? tiny 4.7h, 1f output inductor and capacitor ? low-noise 2mhz pwm operation ? >90% efficiency dual low noise low dropout regulators ? high accuracy ? 2% over temperature ? high psrr ? greater than 70db ? very low output noise ? 32vrms ? ldo1 ? 200ma output current capability ? ldo2 ? 30ma output current capability applications ? cdma2000 mobile phones ? umts/wcdma mobile phones ? wibro modules ? wifi modules ? power amplifier modules (pams) with linear pas typical application cdma2000/wcdma rf power supply circuit 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 0.1 0.3 0.5 0.7 0.9 1.1 1.3 1.5 dac voltage (v) dc/dc output voltage vs. dac voltage i out = 100ma v in = 4.2v bypass mode v out = v dac x 3
micrel, inc. mic2807 february 2008 2 m9999-022008-b ordering information part number marking code* ldo1/ldo2 voltage** junction temp. range package lead finish mic2807-jjyml yjjj 2.5v/2.5v ?40c to +125c 17-pin 2.5mm x 2.8mm mlf ? pb-free mic2807-mmyml yjmm 2.8v/2.8v ?40c to +125c 17-pin 2.5mm x 2.8mm mlf ? pb-free MIC2807-NNYML yjnn 2.85v/2.85v ?40c to +125c 17-pin 2.5mm x 2.8mm mlf ? pb-free mic2807-ooyml yjoo 2.9v/2.9v ?40c to +125c 17-pin 2.5mm x 2.8mm mlf ? pb-free notes: mlf? is a green rohs compliant package. lead fi nish is nipdau. mold compound is halogen free. * over bar ( ) symbol may not be to scale. ** other voltage options available. pl ease contact micrel for details. pin configuration 17-pin 2.5mm x 2.8mm mlf ? (ml) (top view)
micrel, inc. mic2807 february 2008 3 m9999-022008-b pin description pin number pin name pin function 1 dac dac control input (analog voltage input). provides control of output volta ge of dc/dc converter. the output voltage is 3x?s the dac voltage (ex. 0.5v dac = 1.5v out ) when v in > v out . bypass mode is enabled when the dac voltage exceeds 1.2v or v in v out . v out = v dac x 3. 2 byp filter capacitor for ldo1 and ldo2 internal v oltage reference, connect capacitor to ground. 3 agnd signal ground of chip. 4 en2 enables the ldo2 regulator. 5 vin ldo1 and ldo2 supply voltage. must be connected to pin 15. 6 ldo1 output of the ldo1. 7 ldo2 output of the ldo2. 8, 9 out drain of internal bypass switch, also serves as feedback for the internal regulator. 10 pgnd power ground. 11 sw switch: internal power mosfet output switches of dc/dc converter. 12 pvin supply voltage: requires bypass capacitor to ground. 13 en1 enables ldo1 regulator. 14 en enables the dc/dc converter. 15 avin supply voltage for dc/dc converter control circuitry and reference voltage circuit. must be connected to pin 5. 16, 17 nc no connect.
micrel, inc. mic2807 february 2008 4 m9999-022008-b absolute maximum ratings (1) supply voltage (pv in , av in , v in ) ............................ 0v to 6v output switch voltage (v sw ). ...........................................6v dac input voltage (v dac )....................................... 0v to v in logic input voltage (v en , v en1 , v en2 ) ..................... 0v to v in power dissipation (3) ...................................inter nally limited storage temperature (t s ) .........................?65c to +150c esd rating (4) ................................................................ 2kv operating ratings (2) supply voltage (pv in , av in , v in ) ...................... 2.7v to 5.5v output voltage (v out ) ............................................ 0v to v in enable voltage (v en , v en1 , v en2 )............................ 0v to v in dac input voltage (v dac ).................................... 0.1v to v in junction temperature (t j ) ........................ ?40c to +125c thermal resistance 2.5x2.8mm mlf-17 ( ja ) ...................................70c/w electrical characteristics (5) dc/dc converter v in = pv in = av in = v en = 3.6v; v dac = 0.6v; v en1 = v en2 = 0v; l = 4.7h; c out = 1f; t a = 25c, bold values indicate ?40c< t j < +125c, unless noted. ldo1/ldo2 v in = v en1 = v en2 = 3.6v; c outldo1 = 2.2f; v en = 0v; c outldo2 = 1f; i out = 100a; t a = 25c, bold values indicate ?40c< t j < +125c, unless noted. parameter condition min typ max units mic2807 supply voltage range 2.7 5.5 v total quiescent current v en = v en1 = v en2 = 3.6v v dac = 0.6v (dc/dc: not switching) 480 a logic low 0.4 v enable pin threshold logic high 1.3 v enable pin hysteresis 30 mv enable pin input current 0.01 1 a under-voltage lockout threshold (turn-on) 2.6 2.7 v uvlo hysteresis 85 mv shutdown temperature 160 oc shutdown temperature hysteresis 20 oc total shutdown current v en = v en1 = v en2 = 0v 1 5 a dc/dc converter [v en1 = v en2 = 0v] maximum duty cycle 100 % bypass quiescent current v dac = 1.3v 490 650 a quiescent current v dac = 0.6v (regulator on, not switching) 360 450 a output voltage v dac = 0.6v, i load = 0ma 1.746 1.8 1.854 v output voltage line regulation 3.0v< v in < 4.5, i load = 10ma 0.05 0.5 %/v output voltage load regulation 0ma < i out < 400ma 0.2 1 % switch on-resistance i sw = -100ma, high-side switch i sw = 100ma, low-side switch 0.55 0.6 0.75 0.85 ? ? current limit (peak sw current) 0.65 0.85 1.6 a frequency 1.8 2 2.2 mhz
micrel, inc. mic2807 february 2008 5 m9999-022008-b parameter condition min typ max units turn-on time i out = 100a 25 50 s dac input current 0.15 2 a output voltage/ dac voltage (internally set) 3 v/v bypass switch threshold dac voltage required to enable bypass mode 1.176 1.2 1.224 v bypass switch hysteresis 35 mv bypass transition time delay from v dac = 1.3v to v out = 0.90v in 10 40 s bypass switch on-resistance v in = 3.0v, i bypass = 100ma 95 150 m ? bypass switch leakage 5 a bypass over-current limit 1 1.4 2.5 a current limit retry time 32 s current limit retry duty cycle 12.5 % ldo1/ldo2 [v en = 0v] total ground current (8) v en1 = v en2 = 3.6v 220 a turn-on time ldo1 or ldo2; c byp = 0.1f 30 100 s ldo1 [v en = 0v] variation from nominal v out ?1 +1 % output voltage accuracy ?40c to +125c ? 2 +2 % line regulation v in = v out +1v to 5.5v 0.02 0.3 %/v load regulation (6) i out = 100a to 200ma 0.2 0.5 % dropout voltage (7) i out = 50ma; v out > 2.8v i out = 150ma; v out > 2.8v i out = 200ma; v out > 2.8v 20 55 70 120 mv mv mv ground pin current (8) i out = 0ma; en2 = gnd 190 300 a ripple rejection f = up to 1khz; c byp = 0.1f f = 1khz ? 20khz; c byp = 0.1f 70 45 db db current limit v out = 0v 225 300 700 ma output voltage noise c byp =0.1f, 10hz to 100khz 32 v rms ldo2 [v en = 0v] variation from nominal v out ?1 +1 % output voltage accuracy ?40c to +125c ? 2 +2 % line regulation v in = v out +1v to 5.5v 0.02 0.3 %/v load regulation (6) i out = 100a to 30ma 0.2 0.5 % dropout voltage (7) i out = 10ma; v out > 2.8v i out = 30ma; v out > 2.8v 10 30 70 mv mv ground pin current (8) i out = 0ma; en1 = gnd 190 300 a ripple rejection f = up to 1khz; c byp = 0.1f f = 1khz ? 20khz; c byp = 0.1f 65 40 db db current limit v out = 0v 40 60 150 ma output voltage noise c byp = 0.1f, 10hz to 100khz 32 v rms
micrel, inc. mic2807 february 2008 6 m9999-022008-b notes: 1. exceeding the absolute maximum rating may damage the device. 2. the device is not guaranteed to function outside its operating rating. 3. the maximum allowable power dissipation of any t a (ambient temperature) is p d(max) = (t j(max) - t a ) / ja . exceeding the maximum allowable power dissipation will result in excessive die temper ature, and the regulator will go into thermal shutdown. 4. devices are esd sensitive. handling precautions recommended. 5. specification for packaged product only. 6. regulation is measured at constant junction temperature using lo w duty cycle pulse testing, changes in output voltage due t o heating effects are covered by the thermal regulation specification. 7. dropout voltage is defined as the input-to-output differentia l at which the output voltage drops 2% below its nominal value measured at 1v differential. 8. ground pin current is the regulator quiescent current.
micrel, inc. mic2807 february 2008 7 m9999-022008-b typical characteristics (dc/dc) 0 10 20 30 40 50 60 70 80 90 100 output current (a) 1v out dc/dc efficiency 0 0.1 0.2 0.3 0.4 0.5 v in = 4.2v v in = 3.6v v in = 3v 0 10 20 30 40 50 60 70 80 90 100 output current (a) 1.2v out dc/dc efficiency 0 0.1 0.2 0.3 0.4 0.5 v in = 4.2v v in = 3.6v v in = 3v 0 10 20 30 40 50 60 70 80 90 100 output current (a) 1.5v out dc/dc efficiency 0 0.1 0.2 0.3 0.4 0.5 v in = 4.2v v in = 3.6v v in = 3v 0 10 20 30 40 50 60 70 80 90 100 output current (a) 1.8v out dc/dc efficiency 0 0.1 0.2 0.3 0.4 0.5 v in = 4.2v v in = 3.6v v in = 3v 0 10 20 30 40 50 60 70 80 90 100 output current (a) 2.5v out dc/dc efficiency 0 0.1 0.2 0.3 0.4 0.5 v in = 4.2v v in = 3.6v v in = 3v 1.200 1.205 1.210 1.215 1.220 dc/dc line regulation input voltage (v) 2.7 3.1 3.5 4.3 4.7 5.1 5.5 v out = 1.2v i out = 100ma v dac = 0.4v 3.9 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 2.7 input voltage (v) dc/dc switching frequency vs. input voltage 3.1 3.5 3.9 4.3 4.7 5.5 5.1 i out = 300ma v out = 1.5v v dac = 0.5v 0.7 0.9 1.1 1.3 1.5 2.7 input voltage (v) dc/dc current limit vs. input voltage 3.1 3.5 3.9 4.3 4.7 5.5 5.1 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 0.1 0.3 0.5 0.7 0.9 1.1 1.3 1.5 dac voltage (v) dc/dc output voltage vs. dac voltage i out = 100ma v in = 4.2v bypass mode v ou t = v da c x 3 1.815 1.817 1.819 1.821 1.823 1.825 dc/dc load regulation v in = 3.6v 0 output current (a) 0.1 0.2 0.3 0.5 0.4 0.5 1.0 1.5 2.0 2.5 3.0 3.5 -40 temperature (c) dc/dc switching frequency vs. temperature -20 0 20 40 60 120 100 80 i out = 300ma v out = 1.5v v dac = 0.5v v in = 3.6v
micrel, inc. mic2807 february 2008 8 m9999-022008-b typical characteristics (ldo1/ldo2) 0 5 10 15 20 25 30 35 3 6 9 12151821242730 output current (ma) ldo2 dropout voltage vs. output current v out = 2.8v 2.800 2.802 2.804 2.806 2.808 0 5 10 15 20 25 30 output current (ma) ldo2 load regulation v in = 3.6v c out = 1f 2.790 2.795 2.800 2.805 2.810 ldo2 line regulation input voltage (v) 2.7 i out = 15ma c out = 1f 3.1 3.5 3.9 4.3 4.7 5.5 5.1 0 10 20 30 40 50 60 70 80 90 0.01 0.1 1 10 100 1000 frequency (khz) power supply rejection ratio ldo2 [i out =20ma] i out = 20ma v out = 2.8v v in = 3.6v c out = 1f 0 10 20 30 40 50 60 70 80 90 100 0.01 0.1 1 10 100 1000 frequency (khz) power supply rejection ratio ldo2 [i out =1ma] i out = 1ma v out = 2.8v v in = 3.6v c out = 1f 45 50 55 60 65 -40 temperature (c) ldo1 dropout voltage vs. temperature -20 0 20 40 60 120 100 80 i out = 150ma v out = 2.8v v in = 3.6v 200 210 220 230 240 250 0 30 60 90 120 150 output current (ma) ldo1 ground current vs. output current v out = 2.8v v in = 3.6v 150 170 190 210 230 250 270 290 310 -40 temperature (c) ldo1 ground current vs. temperature -20 0 20 40 60 120 100 80 i out = 150ma v out = 2.8v v in = 3.6v 2.76 2.77 2.78 2.79 2.80 2.81 ldo1 line regulation input voltage (v) 2.7 3.1 3.5 3.9 4.3 4.7 5.5 i out = 100ma c out = 2.2f 5.1 0 10 20 30 40 50 60 70 80 90 0.01 0.1 1 10 100 1000 frequency (khz) power supply rejection ratio ldo1 [i out =5ma] i out = 5ma v out = 2.8v v in = 3.6v c out = 2.2f 0 10 20 30 40 50 60 70 90 100 0.1 1 10 100 1000 frequency (khz) power supply rejection ratio ldo1 [i out =100ma] c out = 2.2f v out = 2.8v v in = 3.6v 80 10 20 30 40 50 60 70 80 5 45 85 125 165 205 output current (ma) ldo1 dropout voltage vs. output current v out = 2.8v 0
micrel, inc. mic2807 february 2008 9 m9999-022008-b typical characteristi cs (ldo1/ldo2 cont.) 0.001 0.01 0.1 1 10 0.01 0.1 1 10 100 1000 frequency (khz) ldo1/ldo2 output noise spectral density v out = 2.8v v in = 4.2v c out = 1f 10000
micrel, inc. mic2807 february 2008 10 m9999-022008-b functional characteristics dc/dc pwm waveforms time (400ns/div) v in = 3.6v v out = 1.8v c out = 1f i out = 100ma l = 4.7h dc coupled (100ma/div) inductor current ac coupled (50mv/div) output voltage dc coupled (2v/div) switch voltage dc/dc start-up waveforms time (10s/div) dc coupled (1v/div) outpu t voltage dc coupled (1v/div) enable volta g e i out = 300ma v in = 3.6v v out = 1.8v l = 4.7h c out = 1f dc/dc load transient time (20s/div) dc coupled (100ma/div) output current ac coupled (200mv/div) output volta g e l = 4.7h v in = 3.6v v out = 1.8v c out = 1f 300ma 10ma
micrel, inc. mic2807 february 2008 11 m9999-022008-b functional characteristics (cont.) ldo1 start-up w aveforms time (10s/div) dc coupled (2v/div) output volta g e dc coupled (2v/div) enable volta g e i out = 200ma v in = 3.6v v out = 2.8v c out = 2.2f ldo1 load transient time (20s/div) dc coupled (200mv/div) output current ac coupled (50mv/div) output volta g e c out = 2.2f v in = 3.6v v out = 2.8v 200ma 10ma
micrel, inc. mic2807 february 2008 12 m9999-022008-b functional diagram mic2807 block diagram
micrel, inc. mic2807 february 2008 13 m9999-022008-b device functional description the mic2807 is a power management ic with a single integrated step-down regulator and two low dropout regulators. ldo1 is a 200ma low dropout regulator and ldo2 is a 30ma low dropout regulator. the 500ma pulse-width-modulated (pwm) step-down regulator utilizes a dynamically adjust able output voltage for powering rf power amplifiers . by dynamically adjusting the output power as necess ary, battery life can be dramatically improved in battery powered rf power amplifier applications. also where high power is required, the step-down pwm regulator has a bypass mode where an internal 95m ? switch shorts the out and pvin pins together. pin functional description pvin pvin (power vin) provides power to the mosfets for the step-down switching r egulator section of the mic2807, along with the current limit sensing circuitry. due to the high switching speeds, a minimum 1f capacitor is recommended close to pvin and the power ground (pgnd) pin for bypassing*. avin avin (analog vin) provides power to the internal reference and control section of the step-down regulator. avin, vin, and pvin must a ll be tied together. careful layout should be considered to ensure high frequency switching noise caused by pvin is reduced before reaching avin*. dac the dac pin is the control pin that sets the output voltage of the step-down regulat or. the output voltage is 3x the voltage set on the dac pin (v out = v dac x 3). when 1.2v or greater is applied to the dac pin, the mic2807?s step-down regula tor enters bypass mode. in bypass mode, the input s upply is connected to the output through a 95m ? p-channel mosfet. en/en1/en2 the en pin provides a logic level control of the step- down regulator output. in the o ff state, supply current of the device is greatly reduced (typically 1a). also, in the off state, the output dr ive and bypass switch are placed in a "tri-stated" c ondition, where both the high side p-channel mosfet and the low-side n-channel are in an off or non-conducting state. en1 provides logic control for ldo1, and en2 provides logic control for ldo2. placing a logic high voltage on any one of the respective enable pins (en, en1 or en2) will turn-on (powering up the bias and control circuitry) that respective regulator (dc/dc, ldo1 or ldo2). do not drive the enable pins above the supply voltage (avin and vin). vin vin provides power to the ldo1 and the ldo2 control sections of the mic2807. a minimum 1f capacitor, 2.2f recommended, should be placed as close as possible between the vin and agnd pins. vin must have the same voltage as avin*. out the out pin connects the internal bypass drain and the feedback signal to the output. the bypass applies the input voltage through a low resistance (95m ? typical) p- channel mosfet switch. the feedback signal provides the control path to set t he output at 3 times the dac voltage. sw the 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 pgnd (power gnd) is the ground path for the mosfets in the step-down regulator section. the current loop for the power ground should be as small as possible and separate from the analog ground (agnd) loop*. agnd agnd (analog gnd) 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*. ldo1 regulated output voltage of the ldo1. power is provided by vin. recommended output capacitance is 2.2f. ldo2 regulated output voltage of the ldo2. power is provided by vin. recommended output capacitance is 1f. byp filter capacitor for the voltage reference for the ldo1 and the ldo2. a 100nf capacitor is recommended from the byp pin to ground. * refer to pcb layout section of this data sheet for optimal layout principles.
micrel, inc. mic2807 february 2008 14 m9999-022008-b component selection output capacitor ldo1 output requires a 2.2f ceramic capacitor, while the ldo2 and dc/dc regulator outputs require a 1f ceramic capacitor. all output capacitor values can be increased to improve transient response, but perform- ance has been optimized for a 2.2f ceramic capacitor for ldo1 and 1f ceramic capacitors for both the dc/dc regulator and ldo2. x7r/x5r dielectric-type ceramic capacitors are recommended because of their temperature performance. x5r/x7r-type capacitors change capacitance by 15% over their operating temperature range and are the most stable type of ceramic capacitors. z5u and y5v dielectric capacitors change value by as much as 50% to 60% respectively over their operating temperature ranges. input capacitor for optimal bypassing a mi nimum 1f ceramic, 2.2f recommended, should be placed as close as possible to the vin pin. x5r or x7r dielectrics are recommended for the input capacitor. y5v dielectrics lose most of their capacitance over temperatur e and are therefore, not recommended. for high frequency filtering a minimum 1f is recommended close to the vin and pgnd pins. smaller case size capacitors are recommended due to their lower esr and esl. please refer to the pcb layout section for an example of an appropriate circuit layout. inductor selection the mic2807 is designed for use with a 4.7h inductor. proper selection should ensur e that the inductor can handle the maximum average and peak currents required by the load. 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 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 ? ? ? ? ? ? ? ? ? + = i pk : peak inductor current i out : output/load current v in : input voltage v out : output voltage f: switching frequency of pwm regulator l: inductor value
micrel, inc. mic2807 february 2008 15 m9999-022008-b pcb layout layout schematic
micrel, inc. mic2807 february 2008 16 m9999-022008-b top layer
micrel, inc. mic2807 february 2008 17 m9999-022008-b bottom layer
micrel, inc. mic2807 february 2008 18 m9999-022008-b package information 17-pin 2.5mm x 2.8mm mlf ? (ml) 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. ? 2006 micrel, incorporated.

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