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mic5320 high-performance dual 150ma cap uldo? uldo is a trademark of micrel, inc. mlf and micro leadframe are registered trademarks of amkor technologies, 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 mic5320 is a tiny dual ultra low-dropout (uldo?) linear regulator ideally suited for portable electronics. its ideal for todays most demanding ultra-thin portable applications including mobile phones, camera modules, imaging sensors for digital still and video cameras, pdas, portable media players (pmp) and pc cameras. the mic5320 integrates two high-performance, 150ma uldos into a tiny 6-pin 1.6mm x 1.6mm leadless thin mlf ? package, which provides exceptional thermal package characteristics. the mic5320 is a cap design which enables operation with very small ceramic output capacitors for stability, thereby reduc ing required board space and component cost. the combination of extremely low-dropout voltage, fast transient response and exceptional thermal package characteristics makes it ideal for portable electronics. the mic5320 uldo? is available in fixed-output voltages in the tiny 6-pin 1.6mm x 1.6mm leadless thin mlf ? package which is only 2.56mm 2 in area, less than 30% the area of the sot-23, tsop and mlf ? 3x3 packages. its also available in the thin sot-23-6 lead package and the standard 6-pin 1.6mm x 1.6mm leadless package. additional voltage options are available. for more information, contact micrel marketing department. data sheets and supporting documentation can be found on micrels web site at: www.micrel.com . features ? 2.3v to 5.5v input voltage range ? ultra-low dropout voltage uldo? 35mv @ 150ma ? tiny 6-pin 1.6mm x 1.6mm thin mlf ? leadless package ? low-cost tsot-23-6 package ? independent enable pins ? 150ma output current per ldo ? cap stable with 1f ceramic capacitor ? low quiescent current C 85a per output ? fast turn-on time C 30s ? thermal-shutdown protection ? current-limit protection applications ? mobile phones ? pdas ? gps receivers ? portable electronics ? portable media players ? digital still and video cameras typical application vin en 2 vout 1 vout 2 gnd mic5320-x.xymt 1f en 1 1f 1f vout 2 vout 1 typical application circuit february 2011 m9999-021111-h downloaded from: http:///
micrel, inc. mic5320 february 2011 2 m9999-021111-h ordering information part number manufacturing part number marking* v out1 /v out2 ** junction temp. range package mic5320-1.8/1.5ymt mic5320-gfymt agf 1.8v/1 .5v C40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5320-1.8/1.6ymt mic5320-gwymt agw 1.8v/1 .6v C40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5320-1.8/1.8ymt mic5320-ggymt agg 1.8v/1 .8v C40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5320-2.4/1.5ymt mic5320-h4fymt h4f 2.4v/1 .5v C40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5320-2.5/1.8ymt mic5320-jgymt ajg 2.5v/1 .8v C40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5320-2.5/2.5ymt mic5320-jjymt ajj 2.5v/2 .5v C40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5320-2.6/1.85ymt mic5320-kdymt akd 2.6v/1 .85 C40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5320-2.6/1.8ymt mic5320-kg ymt akg 2.6v/1.8v C40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5320-2.7/2.7ymt mic5320-lly mt all 2.7v/2.7v C40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5320-2.8/1.5ymt mic5320-mfymt amf 2.8v/1 .5v C40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5320-2.8/1.8ymt mic5320-mgymt amg 2.8v/1 .8v C40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5320-2.8/2.6ymt mic5320-mkymt amk 2.8v/2 .6v C40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5320-2.8/2.8ymt mic5320-mmymt amm 2.8v/2 .8v C40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5320-2.85/1.85ymt mic5320-ndy mt and 2.85v/1.85v C40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5320-2.85/2.6ymt mic5320-nk ymt ank 2.85v/2.6v C40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5320-2.85/2.85ymt mic5320-nny mt ann 2.85v/2.85v C40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5320-2.9/1.5ymt mic5320-ofymt aof 2.9v/1 .5v C40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5320-2.9/1.8ymt mic5320-ogymt aog 2.9v/1 .8v C40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5320-2.9/2.9ymt mic5320-ooymt aoo 2.9v/2 .9v C40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5320-3.0/1.8ymt mic5320-pg ymt apg 3.0v/1.8v C40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5320-3.0/2.5ymt mic5320-pjymt apj 3.0v/2 .5v C40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5320-3.0/2.6ymt mic5320-pkymt apk 3.0v/2.6 v C40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5320-3.0/2.8ymt mic5320-pm ymt apm 3.0v/2.8v C40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5320-3.0/2.85ymt mic5320-pnymt apn 3.0v/2. 85v C40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5320-3.0/3.0ymt mic5320-ppymt app 3.0v/3.0 v C40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5320-3.3/1.5ymt mic5320-sfymt asf 3.3v/1 .5v C40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5320-3.3/1.8ymt mic5320-sg ymt asg 3.3v/1.8v C40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5320-3.3/2.5ymt mic5320-sjymt asj 3.3v/2 .5v C40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5320-3.3/2.6ymt mic5320-skymt ask 3.3v/2.6 v C40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5320-3.3/2.7ymt mic5320-slymt*** asl 3.3v/2 .7v C40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5320-3.3/2.8ymt mic5320-sm ymt asm 3.3v/2.8v C40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5320-3.3/2.85ymt mic5320-snymt asn 3.3v/2. 85v C40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5320-3.3/2.9ymt mic5320-so ymt aso 3.3v/2.9v C40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5320-3.3/3.0ymt mic5320-spymt asp 3.3v/3.0 v C40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5320-3.3/3.2ymt mic5320-srymt asr 3.3v/3 .2v C40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5320-3.3/3.3ymt mic5320-ssymt ass 3.3v/3.3 v C40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5320-4.6/2.8ymt mic5320-46m ymt 46m 4.6v/2.8v C40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5320-2.5/1.8yml mic5320- jgyml ajg 2.5v/1.8v C40c to +125c 6-pin 1.6x1.6 mlf ? mic5320-2.5/2.5yml mic5320- jjyml*** ajj 2.5v/2.5v C40c to +125c 6-pin 1.6x1.6 mlf ? mic5320-2.6/1.8yml mic5320- kgyml akg 2.6v/1.8v C40c to +125c 6-pin 1.6x1.6 mlf ? mic5320-2.7/2.7yml mic5320- llyml all 2.7v/2.7v C40c to +125c 6-pin 1.6x1.6 mlf ? mic5320-2.8/1.5yml mic5320 -mfyml amf 2.8v/1.5v C40c to +125c 6-pin 1.6x1.6 mlf ? mic5320-2.8/1.8yml mic5320 -mgyml amg 2.8v/1.8v C40c to +125c 6-pin 1.6x1.6 mlf ? mic5320-2.8/2.8yml mic5320-mmyml amm 2.8v /2.8v C40c to +125c 6-pin 1.6x1.6 mlf ? mic5320-3.0/2.5yml mic5320- pjyml apj 3.0v/2.5v C40c to +125c 6-pin 1.6x1.6 mlf ? mic5320-3.0/2.6yml mic5320-pkyml apk 3.0v /2.6v C40c to +125c 6-pin 1.6x1.6 mlf ? downloaded from: http:///
micrel, inc. mic5320 february 2011 3 m9999-021111-h part number manufacturing part number marking* v out1 /v out2 ** junction temp. range package mic5320-3.0/3.0yml mic5320-ppyml app 3.0v /3.0v C40c to +125c 6-pin 1.6x1.6 mlf ? mic5320-3.3/1.8yml mic5320- sgyml asg 3.3v/1.8v C40c to +125c 6-pin 1.6x1.6 mlf ? mic5320-3.3/2.5yml mic5320- sjyml asj 3.3v/2.5v C40c to +125c 6-pin 1.6x1.6 mlf ? mic5320-3.3/2.7yml mic5320-slyml*** asl 3. 3v/2.7v C40c to +125c 6-pin 1.6x1.6 mlf ? mic5320-3.3/2.8yml mic5320- smyml asm 3.3v/2.8v C40c to +125c 6-pin 1.6x1.6 mlf ? mic5320-1.8/1.5yd6 mic5320-gfyd6 qa gf 1.8v/1.5v C40c to +125c 6-pin tsot-23 mic5320-1.8/1.8yd6 mic5320-ggyd6 qa gg 1.8v/1.8v C40c to +125c 6-pin tsot-23 mic5320-1.8/1.6yd6 mic5320-gwyd6*** qa gw 1.8v/1.6v C40c to +125c 6-pin tsot-23 mic5320-2.4/1.5yd6 mic5320-h4fyd6 qh 4f 2.4v/1.5v C40c to +125c 6-pin tsot-23 mic5320-2.5/1.8yd6 mic5320-jgyd6 qa jg 2.5v/1.8v C40c to +125c 6-pin tsot-23 mic5320-2.5/2.5yd6 mic5320-jjyd6*** qa jj 2.5v/2.5v C40c to +125c 6-pin tsot-23 mic5320-2.6/1.85yd6 mic5320-kdyd6*** qa kd 2.6v/1.85 C40c to +125c 6-pin tsot-23 mic5320-2.6/1.8yd6 mic5320-kgyd6 qa kg 2.6v/1.8v C40c to +125c 6-pin tsot-23 mic5320-2.7/2.7yd6 mic5320-llyd6 qa ll 2.7v/2.7v C40c to +125c 6-pin tsot-23 mic5320-2.8/1.5yd6 mic5320-mfyd6 qa mf 2.8v/1.5v C40c to +125c 6-pin tsot-23 mic5320-2.8/1.8yd6 mic5320-mgyd6 qa mg 2.8v/1.8v C40c to +125c 6-pin tsot-23 mic5320-2.8/2.6yd6 mic5320-mkyd6 qa mk 2.8v/2.6v C40c to +125c 6-pin tsot-23 mic5320-2.8/2.8yd6 mic5320-mmyd6 qa mm 2.8v/2.8v C40c to +125c 6-pin tsot-23 mic5320-2.85/1.85yd6 mic5320-ndyd6*** qa nd 2.85v/1.85v C40c to +125c 6-pin tsot-23 mic5320-2.85/2.6yd6 mic5320-nkyd6*** qa nk 2.85v/2.6v C40c to +125c 6-pin tsot-23 mic5320-2.85/2.85yd6 mic5320-nnyd6 qa nn 2.85v/2.85v C40c to +125c 6-pin tsot-23 mic5320-2.9/1.5yd6 mic5320-ofyd6*** qa of 2.9v/1.5v C40c to +125c 6-pin tsot-23 mic5320-2.9/1.8yd6 mic5320-ogyd6*** qa og 2.9v/1.8v C40c to +125c 6-pin tsot-23 mic5320-2.9/2.9yd6 mic5320-ooyd6*** qa oo 2.9v/2.9v C40c to +125c 6-pin tsot-23 mic5320-3.0/1.8yd6 mic5320-pgyd6 qa pg 3.0v/1.8v C40c to +125c 6-pin tsot-23 mic5320-3.0/2.5yd6 mic5320-pjyd6*** qa pj 3.0v/2.5v C40c to +125c 6-pin tsot-23 mic5320-3.0/2.6yd6 mic5320-pkyd6 qa pk 3.0v/2.6v C40c to +125c 6-pin tsot-23 mic5320-3.0/2.8yd6 mic5320-pmyd6*** qa pm 3.0v/2.8v C40c to +125c 6-pin tsot-23 mic5320-3.0/2.85yd6 mic5320-pnyd6*** qa pn 3.0v/2.85v C40c to +125c 6-pin tsot-23 mic5320-3.0/3.0yd6 mic5320-ppyd6 qa pp 3.0v/3.0v C40c to +125c 6-pin tsot-23 mic5320-3.3/1.5yd6 mic5320-sfyd6 qa sf 3.3v/1.5v C40c to +125c 6-pin tsot-23 mic5320-3.3/1.8yd6 mic5320-sgyd6 qa sg 3.3v/1.8v C40c to +125c 6-pin tsot-23 mic5320-3.3/2.5yd6 mic5320-sjyd6 qa sj 3.3v/2.5v C40c to +125c 6-pin tsot-23 mic5320-3.3/2.6yd6 mic5320-skyd6*** qa sk 3.3v/2.6v C40c to +125c 6-pin tsot-23 mic5320-3.3/2.7yd6 mic5320-slyd6*** qa sl 3.3v/2.7v C40c to +125c 6-pin tsot-23 mic5320-3.3/2.8yd6 mic5320-smyd6*** qa sm 3.3v/2.8v C40c to +125c 6-pin tsot-23 mic5320-3.3/2.85yd6 mic5320-snyd6*** qa sn 3.3v/2.85v C40c to +125c 6-pin tsot-23 mic5320-3.3/2.9yd6 mic5320-soyd6*** qa so 3.3v/2.9v C40c to +125c 6-pin tsot-23 mic5320-3.3/3.0yd6 mic5320-spyd6 qa sp 3.3v/3.0v C40c to +125c 6-pin tsot-23 mic5320-3.3/3.2yd6 mic5320-sryd6*** qa sr 3.3v/3.2v C40c to +125c 6-pin tsot-23 mic5320-3.3/3.3yd6 mic5320-ssyd6 qa ss 3.3v/3.3v C40c to +125c 6-pin tsot-23 notes mlf? is a green rohs-compliant package. lead fi nish is nipdau. mold compound is halogen free. * under bar( _ )/over bar ( ) symbol may not be to scale. thin mlf (mt) package pin 1 identified = . ** for other voltages available. contact micrel for more details. *** contact micrel marketing for availability. downloaded from: http:///
micrel, inc. mic5320 february 2011 4 m9999-021111-h pin configuration 1 vin gnd en2 6 vout1 vout2en1 54 23 vin gnd vout1 en1 en2 3 16 2 45 vout2 6-pin 1.6mm x 1.6mm thin mlf (mt) / mlf (ml) top view tsot-23-6 (d6) top view pin description pin number thin mlf-6 / mlf-6 pin number tsot-23-6 pin name pin function 1 3 vin supply input. 2 2 gnd ground 3 1 en2 enable input (regulator 2). active hi gh input. logic high = on; logic low = off; do not leave floating. 4 6 en1 enable input (regulator 1). active hi gh input. logic high = on; logic low = off; do not leave floating. 5 5 vout2 regulator output C ldo2 6 4 vout1 regulator output C ldo1 hs pad C epad exposed heatsink pa d connected to ground internally. downloaded from: http:///
micrel, inc. mic5320 february 2011 5 m9999-021111-h absolute maximum ratings (1) supply voltage (v in ) .....................................0v to +6v enable input voltage (v en )...........................0v to +6v power dissipation internally limited (3) lead temperature (solde ring, 3sec) ..................260c storage temperature (t s ) ................ C65c to +150c esd rating (4) .........................................................2kv operating ratings (2) supply voltage (v in ) .............................. +2.3v to +5.5v enable input voltage (v en ).............................. 0v to v in junction temperature (t j ) ................. C40c to +125c junction thermal resistance thin mlf-6 / mlf-6 ( ja ) ........................ 100c/w tsot-6 ( ja ) ........................................... 235c/w electrical characteristics (5) v in = en1 = en2 = v out + 1.0v; higher of the two regulator outputs, i outldo1 = i outldo2 = 100a; c out1 = c out2 = 1f; t j = 25c, bold values indicate C40c t j +125c, unless noted. parameter conditions min typ max units variation from nominal v out -2.0 +2.0 % output voltage accuracy variation from nominal v out ; C40c to +125c -3.0 +3.0 % line regulation v in = v out + 1v to 5.5v; i out = 100a 0.02 0.3 0.6 %/v %/v load regulation i out = 100a to 150ma 0.5 2 % dropout voltage (6) i out = 100a i out = 50ma i out = 100ma i out = 150ma 0.1 12 25 35 50 75 100 mv mv mv mv ground current en1 = high; en2 = low; i out = 100a to 150ma en1 = low; en2 = high; i out = 100a to 150ma en1 = en2 = high; i out1 = 150ma, i out2 = 150ma 85 85 150 120 120 190 a a a ground current in shutdown en1 = en2 = 0v 0.01 2 a ripple rejection f = 1khz; c out = 1.0f f=20khz; c out = 1.0f 65 45 db db current limit v out = 0v 300 550 950 ma output voltage noise c out = 1.0f; 10hz to 100khz 90 v rms enable inputs (en1 / en2) logic low 0.2 v enable input voltage logic high 1.1 v v il 0.2v 0.01 1 a enable input current v ih 1.0v 0.01 1 a turn-on time (see timing diagram) turn-on time (ldo1 and 2) c out = 1.0f 30 100 s 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) C t a ) / ja . exceeding the maximum allowable power dissipation will result in excessive die tem perature, and the regulator will go into thermal shutdown. 4. devices are esd sensitive. hand ling precautions recommended. human body model, 1.5k in series with 100pf. 5. specification for packaged product only. 6. dropout voltage is defined as the input-to-output differentia l at which the output voltage drops 2% below its nominal v out . for outputs below 2.3v, the dropout voltage is the input-to-output differential with the minimum input voltage 2.3v. downloaded from: http:///
micrel, inc. mic5320 february 2011 6 m9999-021111-h functional diagram en 1 enable reference ldo1 en 2 ldo2 vin vout 1 vout 2 gnd mic5320 block diagram downloaded from: http:///
micrel, inc. mic5320 february 2011 7 m9999-021111-h typical characteristics 0 -10 -20 -30 -40 -50 -60 -70 -80 power supply rejection ratio 1 frequency (khz) 0.1 10 100 1,000 v in = v out +1v v out = 2.8v c out = 1f 150ma 50ma 0 5 10 15 20 25 30 35 40 02 55 07 5 100 125 150 output current (ma) dropout voltage vs. output current v in = v out + 1v v out = 2.8v c out = 1f en1 = v in 2.50 2.55 2.60 2.65 2.70 2.85 2.90 2.95 3.00 output voltage vs. temperature 20 40 60 80 temperature (c) 2.75 2.80 v in = v out + 1v v out = 2.8v c out = 1f en1 = v in 70 75 80 85 90 95 100 70 20 40 60 80 temperature (c) ground current vs. temperature 100a v in = v out + 1v v out = 2.8v c out = 1f en1 = v in en2 = gnd 70 75 80 85 90 95 100 70 20 40 60 80 temperature (c) ground current vs. temperature 150ma v in = v out + 1v v out = 2.8v c out = 1f en1 = v in en2 = gnd 0.0 0.5 1.0 1.5 2.0 2.5 3.0 0123456 input voltage (v) output voltage vs. input voltage 2.8v 1.5v 2.5 i out = 100a c out = 1f 40 45 50 dropout voltage vs. temperature 20 40 60 80 temperature (c) 100a 10ma 50ma 100ma 150ma v in = v out + 1v v out = 2.8v c out = 1f 0 5 10 15 20 25 30 35 2.70 2.75 2.80 2.85 2.90 02 5 50 75 100 125 150 output current (ma) output voltage vs. output current v in = v out + 1v v out = 2.8v c out1 = c out2 = 1f en1 = v in en2 = gnd 1.40 1.45 1.50 1.55 1.60 02 5 50 75 100 125 150 output current (ma) output voltage vs. output current v in = v out + 1v v out = 1.5v c out1 = c out2 = 1f en1 = gnden2 = v in downloaded from: http:///
micrel, inc. mic5320 february 2011 8 m9999-021111-h typical characteristics (continued) 70 75 80 85 90 02 55 07 5 100 125 150 output current (ma) ground current vs. output current v in = v out + 1v v out = 2.85v en1 = v in c out1 = 1f 142 146 150 154 158 162 02 55 07 5 100 125 150 output current (ma) ground current vs. output current v in = v out + 1v v out = 2.85v en1 = en2 = v in c out1 = c out2 = 1f 510 520 530 540 550 560 570 580 590 600 610 3 3.5 4 4.5 5 5.5 input voltage (v) current limit vs. input voltage en1 = v in c out = 1f 0.001 0.01 0.1 10 output noise spectral density 1 frequency (khz) 0.1 0.01 10 100 1,000 v in = 4v v out = 2.8v c out = 1f i load = 50ma downloaded from: http:///
micrel, inc. mic5320 february 2011 9 m9999-021111-h functional characteristics enable turn-on en1 (1v/div) vout1 (1v/div) time (10s/div ) v in = v out + 1v v out = 2.8v c out = 1f load transient output voltag e (20mv/div) output current (50ma/div) time (40s/div ) v in = v out + 1v v out = 2.8v c out = 1f 150ma 10ma line transient input voltag e (2v/div) output voltag e (50mv/div) time (40s/div ) v in = v out + 1v v out = 2.8v c out = 1f i out = 10ma 5.5v 4v downloaded from: http:///
micrel, inc. mic5320 february 2011 10 m9999-021111-h applications information thermal considerations enable/shutdown the mic5320 is designed to provide 150ma of continuous current for both outputs in a very small package. maximum ambient operating temperature can be calculated based on the output current and the voltage drop across the part. given that the input voltage is 3.3v, the output voltage is 2.8v for v out1 , 1.5v for v out2 and the output current = 150ma. the actual power dissipation of the regulator circuit can be determined using the equation: the mic5320 comes with dual active-high enable pins that allow each regulator to be disabled independently. forcing the enable pin low disables the regulator and sends it into a zero off-mode-current state. in this state, current consumed by the regulator goes nearly to zero. forcing the enable pin high enables the output voltage. the active-high enable pin uses cmos technology and the enable pin cannot be left floating; a floating enable pin may cause an indeterminate state on the output. p d = (v in C v out1 ) i out1 + (v in C v out2 ) i out2 + v in i gnd input capacitor the mic5320 is a high-performance, high bandwidth device. therefore, it requ ires a well-bypassed input supply for optimal performance. a 1f capacitor is required from the input to ground to provide stability. low-esr ceramic capacitors provide optimal performance at a minimum of space. additional high- frequency capacitors, such as small-valued npo dielectric-type capacitors, help filter out high- frequency noise and are good practice in any rf- based circuit. because this device is cmos and the ground current is typically <150a over the load range, the power dissipation contributed by the ground current is < 1% and can be ignored for this calculation. p d = (3.3v C 2.8v) 150ma + (3.3v -1.5) 150ma p d = 0.345w output capacitor the mic5320 requires an out put capacitor of 1f or greater to maintain stability. the design is optimized for use with low-esr ceramic chip capacitors. high esr capacitors may cause high frequency oscillation. the output capacitor can be increased, but performance has been optimized for a 1f ceramic output capacitor and does not improve significantly with larger capacitance. to determine the maximum ambient operating temperature of the package, use the junction-to- ambient thermal resistance of the device and the following basic equation: p d(max) = t j(max) - t a ja ? ? x7r/x5r dielectric-type ceramic capacitors are recommended because of their temperature performance. x7r-type capacitors change capacitance by 15% over t heir operating temperature range and are the most stable type of ceramic capacitors. z5u and y5v dielectric capacitors change value by as much as 50% and 60%, respectively, over their operating temperature ranges. to use a ceramic chip capacitor with y5v dielectric, the value must be much higher than an x7r ceramic capacitor to ensure the same minimum capacitance over the equivalent operating temperature range. t j(max) = 125c, the maximum junction temperature of the die ja thermal resistance = 100c/w. the table below shows junction-to-ambient thermal resistance for the mic5320 in different packages. package ja recommended minimum footprint jc 6-pin 1.6x1.6 thin mlf ? 100c/w 2c/w thermal resistance no-load stability unlike many other voltage regulators, the mic5320 will remain stable and in regulation with no load. this is especially important in cmos ram keep-alive applications. downloaded from: http:///
micrel, inc. mic5320 february 2011 11 m9999-021111-h substituting p d for p d(max) and solving for the ambient operating temperature will give the maximum operating conditions for the regulator circuit. the junction-to-ambient thermal resistance for the minimum footprint is 100c/w. the maximum power dissipation must not be exceeded for proper operation. for example, when operating the mic5320-mfymt at an input voltage of 3.3v and 150ma loads at each output with a minimum footprint layout, the maximum ambient operating temperature t a can be determined as follows: 0.345w = (125c C t a )/(100c/w) t a = 90.5c therefore, a 2.8v/1.5v application with 150ma at each output current can accept an ambient operating temperature of 90.5c in a 1.6mm x 1.6mm thin mlf ? package. for a full discussion of heat sinking and thermal effects on voltage regulators, refer to the regulator thermals section of micrels 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 downloaded from: http:///
micrel, inc. mic5320 february 2011 12 m9999-021111-h package information 6-pin 1.6mm x 1.6mm thin mlf (mt) 6-pin 1.6mm x 1.6mm mlf (ml) downloaded from: http:///
micrel, inc. mic5320 february 2011 13 m9999-021111-h 6-pin tsot-23 (d6) 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 micrel makes no representations or warranties with respect to t he accuracy or completeness of the information furnished in this data sheet. this information is not intended as a warranty and micrel does not assume responsibility for it s use. micrel reserves the right to change circuitry, specifications and descriptions at any time without notice. no license, whether express, implied, arising by estoppel or other wise, to any intellectual property rights is granted by this document. except as provided in micrels terms and conditions of sale for such products, mi crel assumes no liability whatsoever, and micrel disclaims any express or implied warranty relati ng to the sale and/or use of micrel products i ncluding liability or warranties relating to fitness for a particular purpose, merchantab ility, or infringement of any patent, copyright or other int ellectual property right. mic ct us r rel products are not designed or authori zed for use as components in life support app liances, devices or systems where malfun ction of a produ can reasonably be expected to result in pers onal injury. life support devices or system s 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 result in a si gnificant injury to the er. a purchasers use or sale of micrel products for use in life support appliances, devices or systems is a purchasers own risk and purchase agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 2006 micrel, incorporated. downloaded from: http:///

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