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mic5311 lowq? mode dual 300ma ldo mlf and micro leadframe are 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 march 2006 m9999-032706 (408) 955-1690 general description the mic5311 is a high performance, dual cap low dropout regulator offering ultra-low operating current and a second, even lower operating current mode, lowq? mode, reducing operating current by 75%. each regulator can sour ce up to 300ma of output current maximum. ideal for battery operated a pplications, the mic5311 offers 1% accuracy, extremely low dropout voltage (60mv @ 150ma), and low ground current (typically 28a total). when put into lowq? mode, the internal current draw drops down to 7a total. the mic5311 also comes equipped with a ttl logic compatible enable pin that allows the part to be put into a zero-off- mode current state, drawing no current when disabled. the mic5311 is a cap design, operating with very small ceramic output capacitors for stability, reducing required board space and component cost. the mic5311 is available in fixed output voltages in the 3mm x 3mm mlf-10 leadless package. data sheets and support documentation can be found on micrel?s web site at www.micrel.com. features ? input voltage range: 2.5v to 5.5v ? lowq? mode - 7a total quiescent current - 10ma output current capable lowq? mode - logic level control with external pin ? stable with ceramic output capacitor ? 2 ldo outputs ? 300ma each ? tiny 3mm x 3mm mlf?-10 package ? low dropout voltage of 60mv @ 150ma ? ultra-low quiescent current of 28a total in full current mode ? high output accuracy - 1.0% initial accuracy - 2.0% over temperature ? thermal shutdown protection ? current limit protection applications ? cellular/pcs phones ? wireless modems ? pdas ? mp3 players typical application v in en1 en2 lowq byp baseband processor v out1 v core v out2 v i/o gnd mic5311-xxbml
micrel, inc. mic5311 march 2006 2 m9999-032706 (408) 955-1690 ordering information part number standard pb-free output voltage* junction temp. range package mic5311-gmbml mic5311-gmyml 1.8v/2.8v ?40c to +125c 10-pin 33 mlf? mic5311-dkbml MIC5311-DKYML 1.85v/2.6 v ?40c to +125c 10-pin 33 mlf? mic5311-nlyml 2.85v/2.7v ?40c to +125c 10-pin 33 mlf? note: *other voltage options available between 1. 25v and 5v. contact micrel for details. pin configuration 1 v in en1 en2 lowq byp 10 v out1 v out2 nc nc gnd 9 8 7 6 2 3 4 5 mic5311-xxbml (3x3) pin description fixed pin name pin function 1 v in supply input. (v in1 and v in2 are internally tied together) 2 en1 enable input (regulator 1). active hi gh input. logic high = on; logic low = off; do not leave floating 3 en2 enable input (regulator 2). active hi gh input. logic high = on; logic low = off; do not leave floating 4 lowq? lowq? mode. active low input. logic high = full power mode; logic low = light load mode; do not leave floating. 5 byp reference bypass: connect external 0.01f to gnd to reduce output noise. may be left open. 6 gnd ground. 7 nc 8 nc 9 v out 2 output of regulator 2 10 v out 1 output of regulator 1 ep gnd ground. internally conn ected to the exposed pad.
micrel, inc. mic5311 march 2006 3 m9999-032706 (408) 955-1690 absolute maximum ratings (1) supply input voltage (v in ) .............................. 0v to 6v enable input voltage (v en )............................. 0v to 6v lowq? input voltage (v lowq? )...................... 0v to 6v power dissipation (p d ) ..................internally limited (3) junction temperature ....................... -40c to +125c lead temperature (solde ring, 5sec .) .................260c storage temperature (t s ) ................. -65c to +150c operating ratings (2) supply input voltage (v in )..........................2.5v to 5.5v enable input voltage (en1/en2/lowq?) ...... 0v to v in junction temperature (t j ) .................. -40c to +125c package thermal resistance mlf-10 ( ja ) ................................................. 63c/w electrical characteristi cs (full power mode) v in = v out + 1.0v for higher output of the regulator pair; lowq? = v in ; c out = 2.2f, i out = 100a; t j = 25c, bold values indicate -40c to +125, unless noted. parameter conditions min typ max units variation from nominal v out -1.0 +1.0 % output voltage accuracy variation from nominal v out ; -40c to +125c -2.0 +2.0 % line regulation v in = v out +1v to 5.5v 0.02 0.3 0.6 %/v load regulation i out = 100 a to 150ma i out = 100 a to 300ma 0.35 0.7 1.0 1.5 % % dropout voltage i out = 150ma i out = 300ma 60 120 240 mv mv ground pin current i out 1 = i out 2 = 100a to 300ma 28 45 50 a a ground pin current in shutdown v en < 0.2v 0.1 a ripple rejection f = up to 1khz; c out = 2.2 f ceramic; c byp = 10nf f = 1khz ? 20khz; c out = 2.2 f ceramic; c byp = 10nf 65 35 db db current limit v out = 0v (both regulators) 350 450 700 ma output voltage noise c out = 2.2 f, c byp = 0.01f, 10hz to 100khz 45 vrms enable and lowq? input (en1/en2/lowq ? ) 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 c out = 2.2f; c byp = 0.01f 300 500 s light load response into light load 50 s response time (4) out of light load 50 s
micrel, inc. mic5311 march 2006 4 m9999-032706 (408) 955-1690 electrical characteristics (lowq? mode) v in = v out + 1.0v for higher output of t he regulator pair; lowq? = 0v; c out = 2.2f, i out = 100a; t j = 25c, bold values indicate -40c to +125c, unless noted. parameter conditions min typ max units output voltage accuracy variation from nominal v out -2.0 -3.0 +2.0 +3.0 % % line regulation v in = v out +1v to 5.5v 0.02 0.3 0.6 %/v load regulation i out = 100 a to 10ma 0.1 0.5 % dropout voltage i out = 10ma 100 200 mv ground pin current both outputs enabled 7 10 12 a a ground pin current in shutdown v en < 0.2v 0.01 1.0 a ripple rejection f = up to 1khz; c out = 2.2f ceramic; c byp = 10nf f = 1khz ? 20khz; c out = 2.2 f ceramic; c byp = 10nf 45 30 db db current limit v out = 0v (both regulators) 40 75 150 ma 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 di e temperature, and the regulator will go into thermal shutdown. 4. response time defined as the mi nimum hold-off time after the lowq ? command before applying load transients.
micrel, inc. mic5311 march 2006 5 m9999-032706 (408) 955-1690 typical characteristics 0 10 20 30 40 50 60 70 80 90 psrr (db) frequency (hz) ripple rejectio n vs. i load (normal mode) 150ma 50ma 300ma 10 100 1k 10k 1m 100k v out =1.85v in =v out +1v = c byp = 10nf v c out 2.2f 0 10 20 30 40 50 60 70 80 90 psrr (db) frequency (hz) ripple rejectio n lowq mode 10 100 1k 10k 1m 100k v out =1.85v . v in =v out +1v i load =10ma c out = 2.2 f ceramic 2.3 2.35 2.4 2.45 2.5 2.55 2.6 2.65 2.7 0 25 50 75 100 125 output voltage (v) output voltage vs. temperature 100a 0 0.5 1 1.5 2 2.5 3 0123456 output voltage (v) supply voltage (v) dropout characteristic s 100ma 150ma 300ma v out =2.6v 0 20 40 60 80 100 120 140 160 -40 -20 0 20 40 60 80 100 120 dropout voltage (mv) dropout vs. temperature (normal mode) 50ma 150ma 300ma 0 20 40 60 80 100 120 140 -40 -20 0 20 40 60 80 100 120 dropout voltage (mv) dropout vs. temperature (lowq mode) 3ma 6ma 10ma 0 5 10 15 20 25 30 35 1.3 1.8 2.3 2.8 3.3 3.8 4.3 4.8 5.3 ground current (a) supply voltage (v) ground current 100ma 150ma 300ma 10ma lowq? vs. supply voltage 0 5 10 15 20 25 30 35 -40 -20 0 20 40 60 80 100 120 ground current (a) ground current 100ma 150ma 300ma 50ma vs. temperature 0 1 2 3 4 5 6 7 8 9 -40 -20 0 20 40 60 80 100 120 ground current (a) ground current v s. temperature (lowq mode) 100a 10ma 0.001 0.01 0.1 1 noise (v/roothz) frequency (hz) output noise spectral density 10 100 1k 10k 100k 1m 10m v in = 4.45v c out = 2.2 f c byp = 0.01f v out = 1.8v r out
micrel, inc. mic5311 march 2006 6 m9999-032706 (408) 955-1690 functional characteristics enable on- normal i load = 200ma v out = 2.6v time (40s/div) v out (1v/div) v en (500mv/div) enable off - normal i load = 200ma v out = 2.6v time (10s/div) v out (1v/div) v en (500mv/div) line transient - lowq v out = 2.6v v in = v out + 1v c out = 2.2f lowq = 0v time (200s/div) v in (1v/div) v out (20mv/div) 5.5v 4v i load = 10ma line transient - normal time (40s/div) v out (50mv/div) v in (1v/div) i load = 300ma v out = 2.6v c out = 2.2f lowq = 5.5v 5.5v 4v load transient - lowq time (200s/div) v out (10mv/div) 10ma 0ma v out = 2.6v v in = v out + 1v c out = 2.2f i out (10mv/div) load transient - normal v out = 2.6v v in = v out + 1v c out = 2.2f time (1ms/div) v out (20mv/div) i out (100ma/div) 100a 300ma
micrel, inc. mic5311 march 2006 7 m9999-032706 (408) 955-1690 functional characteristics (cont.) normal to lowq transien t time (40s/div) v out2 (500mv/div) v out1 (500mv/div) lowq tm (1v/div) normal lowq tm i load = 10ma lowq to normal transien t time (40s/div) v out2 (500mv/div) v out1 (500mv/div) lowq tm (1v/div) normal lowq tm i load = 10ma
micrel, inc. mic5311 march 2006 8 m9999-032706 (408) 955-1690 functional diagram vout1 vout2 gnd en2 en1 vin lowq ldo1 ldo2 reference lowq? byp mic5311 block diagram
micrel, inc. mic5311 march 2006 9 m9999-032706 (408) 955-1690 functional description the mic5311 is a high performance, low quiescent current power management ic consisting of two cap low dropout regulators with a lowq? mode featuring lower operating current. both regulators are capable of sourcing 300ma. enable 1 and 2 the enable inputs allow for logic control of both output voltages with individual enable inputs. the enable input is active high, requiring 1.0v for guaranteed operation. the enable input is cmos logic and cannot be left floating. lowq ? mode the lowq? pin is logic level low, requiring <0.2v to enter the lowq? mode. the lowq? pin cannot be left floating. features of the lowq? mode include lower total quiescent current of typically 7ua. input capacitor good bypassing is recommended from input to ground to help improve ac performance. a 1f capacitor or greater located close to the ic is recommended. larger load currents may require larger capacitor values. bypass capacitor the internal reference voltage of the mic5311 can be bypassed with a capacitor to ground to reduce output noise and increase input ripple rejection (psrr). a quick-start feature allows fo r quick turn-on of the output voltage. the recommended nomi nal bypass capacitor is 0.01f, but an increase will result in longer turn on times t on . output capacitor each regulator output requires a 2.2f ceramic output capacitor for stability. the output capacito r value can be increased to improve transient response, but performance has been optimized for a 2.2f ceramic type output capacitor. x7r/x5r dielectric-type ceramic capacitors are recommended because of their temperature performance. 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. to use a ceramic chip capacitor with y5v dielectric, the value must be much higher than a x7r ceramic capacitor to ensure the same minimum capacitance over the equivalent operating temperature range. thermal considerations the mic5311 is designed to provide 300ma of continuous current per channel in a very small mlf package. maximum power di ssipation can be calculated based on the output current and the voltage drop across the part. to determine the maximum power dissipation of the package, use the j unction-to-ambient thermal resistance of the device and the following basic equation: p d (max) = (t j (max) - t a ) / ja t j (max) is the maximum junction temperature of the die, 125c, and t a is the ambient operating temperature. ja is layout dependent; table 1 shows examples of the junction-to- ambient thermal resistance for the mic5311. table 1. mlf? thermal resistance the actual power dissipation of the regulator circuit can be determined using the equation: p dtotal = p d ldo1 + p d ldo2 p d ldo1 = (v in -v out1 ) x i out1 p d ldo2 = (v in -v out2 ) x i out2 substituting p d(max) for p d and solving for the operating conditions that are critical to the application will give the maximum operating conditions for the regulator circuit. for example, when operating the mic5311 at 60c with a minimum footprint layout, the maximum load currents can be calculated as follows: p d (max) = (t j (max) - t a ) / ja p d (max) = (125c - 60c) / 63c/w p d (max) = 1.03w the junction-to-ambient thermal resistance for the minimum footprint is 63c/w , from table 1. the maximum power dissipation must not be exceeded for proper operation. using a lithium-ion battery as the supply voltage of 4.2v, 1.8v out /150ma for channel 1 and 2.8v out /100ma for channel 2, power dissipation can be calculated as follows: p d ldo1 = (v in -v out1 ) x i out1 p d ldo1 = (4.2v-1.8v) x 150ma p d ldo1 = 360mw p d ldo2 = (v in -v out2 ) x i out2 p d ldo1 = (4.2v-2.8v) x 100ma p d ldo1 = 140mw package ja recommended minimum footprint jc 3x3 mlf?-10 63c/w 2c/w
micrel, inc. mic5311 march 2006 10 m9999-032706 (408) 955-1690 p dtotal = p d ldo1 + p d ldo2 p dtotal = 360mw + 140mw p dtotal = 500mw the calculation shows that we are well below the maximum allowable power dissipation of 1.03w for a 60 ambient temperature. after the maximum power dissipation has been calculated, it is always a good idea to calculate the maximum ambient temperature for a 125 junction temperature. calculating maximum ambient temperature as follows: t a(max) = t j(max) ? (p d x ja ) t a(max) = 125c ? (500mw x 63c/w) t a(max) = 93.5c for a full discussion of heat sinking and thermal effects on voltage regulators, refer to the ?regulator thermals? section of micrel?s designing with low-dropout voltage regulators handbook. this information can be found on micrel's website at: http://www.micrel.com/_pdf/other/ldobk_ds.pdf
micrel, inc. mic5311 march 2006 11 m9999-032706 (408) 955-1690 package information 10-pin 3x3 mlf (mlf) 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 specificati ons 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. li fe support devices or systems are devices or systems that (a ) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to resul t in a significant injury to the user. a purchaser?s use or sale of micrel products for use in life s upport appliances, devices or systems is a pu rchaser?s own risk and purchaser agrees to fully indemnify micrel fo r any damages resulting from such use or sale. ? 2004 micrel, incorporated.

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