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mic5355/6 dual 500ma cap low dropout, micropower linear regulator 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 march 2012 m9999-031512-a general description the mic5355/6 is an advanced dual, micropower, low dropout linear regulator. t he mic5355/6 provides low quiescent current operation, using only 70 a with both outputs enabled making it ideal for battery-powered systems. in shutdown, the qui escent current drops to less than 1a. the mic5355/6 provides two independently- controlled high-performance 500ma ldos with typical dropout voltage of 350mv at rated load. in addition, the mic5355/6 is optimized to provide fast load and line transient performance with low-esr ceramic output capacitors, requiring a minimum of only 2.2f. the mic5356 also incorporates an active discharge feature when the part is disabled that switches in a 30 ? load to pull down the output of the regulator. the mic5355/6 is available in fixed output voltages in a thermally-enhanced 8-pin epad msop package or 8-pin epad 3mm x 3mm mlf ? package. data sheets and support documentation can be found on micrel?s web site at www.micrel.com . features ? 2.5v to 5.5v input voltage range ? 2% initial output accuracy ? wide output voltage range: 1.0v to 3.3v ? low quiescent current: 38a per output ? very low quiescent current in shutdown: <1 a typical ? cap stable with 2.2f ceramic capacitor ? low dropout voltage: 350mv at 500ma ? excellent load/line transient response ? independent logic controlled enable pins ? output discharge circuit: mic5356 ? current and thermal limit protection ? power 8-pin epad msop package or 8-pin epad 3mm x 3mm mlf ? package applications ? smart phones ? gps, pmp, dsc ? notebooks and desktops ? digital tv ? portable electronics _________________________________________________________________________________________________________________________ typical application
micrel, inc. mic5355/6 march 2012 2 m9999-031512-a ordering information manufacturer ordering part number part number (1) marking code voltage (2) junction temperature range package mic5355-sgymme mic5355-3.3/1.8ymme 55sg 3.3v/1.8v ?40 to +125c 8-pin epad msop mic5355-s4ymme mic5355-3.3/1.2ymme 55s4 3.3v/1.2 v ?40 to +125c 8-pin epad msop mic5355-scymme mic5355-3.3/1.0ymme 55sc 3.3v/1.0 v ?40 to +125c 8-pin epad msop mic5355-g4ymme mic5355-1.8/1.2ymme 55g4 1.8v/1.2 v ?40 to +125c 8-pin epad msop MIC5355-JGYMME mic5355-2.5/1.8ymme 55jg 2.5v1.8v ?40 to +125c 8-pin epad msop mic5356-sgymme mic5356-3.3/1.8ymme 56sg 3.3v/1.8v ?40 to +125c 8-pin epad msop mic5356-s4ymme mic5356-3.3/1.2ymme 56s4 3.3v/1.2 v ?40 to +125c 8-pin epad msop mic5356-scymme mic5356-3.3/1.0ymme 56sc 3.3v/1.0 v ?40 to +125c 8-pin epad msop mic5356-g4ymme mic5356-1.8/1.2ymme 56g4 1.8v/1.2 v ?40 to +125c 8-pin epad msop mic5356-jgymme mic5356-2.5/1.8ymme 56jg 2.5v/1.8 v ?40 to +125c 8-pin epad msop mic5356-mmyml mi5356-2.8/2.8yml m3m 2.8v/2.8v ?40 to +125c 8-pin epad 3mm x 3mm mlf ? mic5356-mgyml mi5356-2.8/1.8yml m3g 2.8v/1.8v ?40 to +125c 8-pin epad 3mm x 3mm mlf ? notes: 1. mic5356 offers auto-discharge function. 2. other voltage available. contact micrel for detail. pin configuration 8-pin epad msop (mme) 8-pin epad 3mm x 3mm mlf ? (ml) pin description pin number pin name pin function 1 vin supply input. 2 gnd ground. 3 nc not internally connected. 4 en2 enable input ldo2. active high input. logic high = on; logic lo w = off; do not leave floating. 5 en1 enable input ldo1. active high input. logic high = on; logic lo w = off; do not leave floating. 6 nc not internally connected. 7 vout2 ldo2 output. 8 vout1 ldo1 output. epad hspad heatsink pad. connect to ground.
micrel, inc. mic5355/6 march 2012 3 m9999-031512-a absolute maximum ratings (1) supply voltage (v in ) ........................................ ?0.3v to +6v enable voltage (v en1, v en2 ). ....................?0.3v to v in +0.3v power dissipation (p d ) ........................... internally limited (3) lead temperature (solde ring, 10sec .)....................... 260c junction temperature (t j ) ........................?40c to +125c storage temperature (t s ) .........................?65c to +150c esd rating (4) ................................................. esd sensitive operating ratings (2) supply voltage (v in )....................................... +2.5v to 5.5v enable voltage (v en1, v en2 ). ................................... 0v to v in junction temperature (t j ) ........................ ?40c to +125c junction thermal resistance 8-pin epad msop ( ja )..................................64.4c/w 8-pin epad 3mm x 3mm mlf ? ( ja )..................61c/w electrical characteristics (5) v in = v en1 = v en2 = v out +1v; higher of the two outputs; i outldo1 = i outldo2 = 100a; c out1 = c out2 = 2.2 f; t j = +25 ? c, bold values indicate ?40c to +125c, unless noted. parameter condition min. typ. max. units variation from nominal v out ? 2.0 +2.0 output voltage accuracy variation from nominal v out ? 3.0 +3.0 % line regulation v in = v out + 1v to 5.5v, i out = 100a 0.02 0.3 %/v load regulation i out = 100a to 500ma 0.3 1 % i out = 50ma 40 100 dropout voltage i out = 500ma 350 800 mv v en1 = high; v en2 = low; i out1 = 0ma 38 53 v en1 = low; v en2 = high; i out2 = 0ma 38 53 v en1 = v en2 = high; i out1 = i out2 = 0ma 70 100 v en1 = high; v en2 = low; i out1 = 500ma 55 90 v en1 = low; v en2 = high; i out2 = 500ma 55 90 ground pin current v en1 = v en2 = high; i out1 = i out2 = 500ma 105 200 a shutdown current v en1 = v en2 ? 0.2v 0.05 1 a ripple rejection f = 1khz; c out = 2.2f; i out = 250ma 60 db current limit v out = 0v 525 750 1050 ma output voltage noise c out = 2.2f, 10hz to 100khz 146 v rms auto-discharge nfet resistance mic5356 only; v en1 = v en2 = 0v; v in = 3.6v; i out = ? 3ma 30 ? 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 temperatur e and the register will go into thermal shutdown. 4. devices are esd sensitive. handling pr ecautions recommended. human body model, 1.5k ? in series with 100pf. 5. specification for packaged product only.
micrel, inc. mic5355/6 march 2012 4 m9999-031512-a electrical characteristics (4) v in = v en1 = v en2 = v out +1v; higher of the two outputs; i outldo1 = i outldo2 = 100a; c out1 = c out2 = 2.2 f; t j = +25 ? c, bold values indicate ?40c to +125c, unless noted. parameter condition min. typ. max. units enable inputs (en1/en2) logic low 0.2 enable input voltage logic high 1.2 v v il ? 0.2v 0.01 1 enable input current v ih ? 1.2v 0.01 1 a turn-on time 50 125 s notes: 1. exceeding the absolute maxi mum 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.
micrel, inc. mic5355/6 march 2012 5 m9999-031512-a typical characteristics power supply rejection ratio -80 -70 -60 -50 -40 -30 -20 -10 0 10 100 1000 10000 100000 frequency (hz) db v en = v in = 2.82v v out = 1.8v c out = 2.2f 500ma 100a 250ma output voltage vs. input voltage 2 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3 2.5 3 3.5 4 4.5 5 5.5 input voltage (v) output voltage (v) 100 a 500ma c in = c out = 2.2 f output voltage vs. input voltage 1.6 1.7 1.8 1.9 2 2.5 3 3.5 4 4.5 5 5.5 input voltage (v) output voltage (v) 100 a 500ma c in = c out = 2.2 f output voltage vs. output current (v out1 ) 2.2 2.3 2.4 2.5 2.6 2.7 0 100 200 300 400 500 output current (ma) output voltage (v) v in = v en1 = 3.5v v out1 = 2.5v c in = c out = 2.2 f output voltage vs. output current (v out2 ) 1.5 1.6 1.7 1.8 1.9 2 0 100 200 300 400 500 output current (ma) output voltage (v) v in = v en2 = 3.5v v out2 = 1.8v c in = c out = 2.2 f ground current vs. input voltage (single output) 0 5 10 15 20 25 30 35 40 45 50 55 60 65 2.5 3 3.5 4 4.5 5 5.5 input voltage (v) ground current ( a) 500ma no load v out2 = 1.8v c in = c out = 2.2 f v en1 = gnd, v en2 = v in ground current vs. input voltage (dual output) 0 15 30 45 60 75 90 105 120 2.5 3 3.5 4 4.5 5 5.5 input voltage (v) ground current( a) 500ma no load v out1 = 2.5v, v out2 = 1.8v c in = c out = 2.2 f v en1 = v en2 = v in ground current vs. output current 0 15 30 45 60 75 90 105 120 0 50 100 150 200 250 300 350 400 450 500 output current (ma) ground current( a) dual output single output v in = 3.5v c in = c out = 2.2 f ground current vs. temperature (single output) 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 -40 -20 0 20 40 60 80 100 120 temperature (c) ground current ( a) 500ma no load v out1 =2.5v v en1 = v in = 3v v en2 = gnd c in = c out = 2.2 f
micrel, inc. mic5355/6 march 2012 6 m9999-031512-a typical characteristics (continued) ground current vs. temperature (dual output) 0 20 40 60 80 100 120 -40 -20 0 20 40 60 80 100 120 temperature (c) ground current ( a) no load 500ma v out1 = 2.5v, v out2 = 1.8v v en1 = v en2 = v in = 3.5v c in = c out = 2.2 f dropout voltage vs. temperature 0 50 100 150 200 250 300 350 400 450 -40 -20 0 20 40 60 80 100 120 temperature (c) dropout voltage (mv) 150ma 300ma 500ma c in = c out = 2.2 f 50ma dropout voltage vs. output current 0 50 100 150 200 250 300 350 0 100 200 300 400 500 output current (ma) dropout voltage (mv) v out1 = 2.5v c in = c out = 2.2 f current limit vs. input voltage 600 650 700 750 800 850 900 2.533.544.555.5 input voltage (v) current limit (ma) v out1 = 2.5v v out2 = 1.8v c in = c out = 2.2 f output noise spectral density 0.001 0.01 0.1 1 10 100 1000 10000 100000 1000000 frequency (hz) noise (v/ hz) v in = 3.5v v out2 = 1.81v c in - c out = 2.2f noise (10hz to 100khz) =146vrms
micrel, inc. mic5355/6 march 2012 7 m9999-031512-a functional characteristics
micrel, inc. mic5355/6 march 2012 8 m9999-031512-a functional diagrams mic5355 block diagram mic5356 block diagram
micrel, inc. mic5355/6 march 2012 9 m9999-031512-a application information mic5355/6 is a dual 500ma ldo. the mic5356 includes an auto-discharge circuit for each ldo output that is activated when the output is disabled. the mic5355/6 regulator is fully protected from damage due to fault conditions through linear current limiting and thermal shutdown. input capacitor the mic5355/6 is a high-performance, high-bandwidth device. a 2.2f input capacitor from the input pin to ground is required to provi de stability. low-esr ceramic capacitors provide optimal performance in small board area. 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. x5r or x7r dielectrics are recommended for the input capacitor. y5v dielectrics lose most of their capacitance over temperature and are therefore not recommended. output capacitor the mic5355/6 requires an output capacitor of 2.2f 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 2.2f ceramic output capacitor and does not improve significantly with larger capacitance. x7r and x5r dielectric ceramic capacitors are recommended because of their temperature performance. x7r 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% and 60% respectively over t heir 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 equiva lent operating temperature range. no load stability unlike many other voltage regul ators, the mic5355/6 will remain stable and in regulation with no load. enable/shutdown the mic5355/6 comes with two active high enable pins that allow each regulator to be disabled independently. forcing the enable pin low disables the regulator and places it into an off mode current state drawing virtually zero current. when disabled, the mic5356 switches an internal 30 ? load on the regulator output to discharge the external capacitor. forcing the enable pin high enables the output voltage. the active high enable pin uses cmos technology and cannot be left floating. a floating enable pin may cause an indeterminate state on the output. thermal considerations the mic5355/6 is designed to provide two 500ma continuous current outputs in a small package. maximum operating temperature can be calculated based on the output currents and the voltage drop across the part. for example, if the input voltage is 3.0v, v out1 = 2.5v, v out2 = 1.8v and each with an output current = 500ma. the actual power dissipation of the regulator circuit can be determined using the equation: p d = (v in ? v out1 ) i out ? (v in ? v out2 ) i out2 ? v in i gnd because this is cmos device and the ground current is typically <100a over the load range, the power dissipation contributed by the ground current is <1% which can be ignored for this calculation: p d = (3.0v ? 2.5v) 500ma + (3.0v ? 1.8v) 500ma p d = 0.85w 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: ? ? ? ? ? ? ? ? ? ? ja a j(max) d(max) t t p t j(max) = 125c ja = 64.4c/w
micrel, inc. mic5355/6 march 2012 10 m9999-031512-a 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 64.4c/w. the maximum power dissipation must not be exceeded for proper operation. for example, when operating a 2.5v/1.8v application with an input voltage of 3.0v and 500ma at each output with a minimum footprint layout, the maximum ambient operating temperature t a can be determined as follows: 0.85w = (125c ? t a )/(64.4c/w) t a = 70.3c therefore, a MIC5355-JGYMME application with 500ma at each output current can accept an ambient operating temperature of 70.3c in a small 8-pin epad msop package. 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. mic5355/6 march 2012 11 m9999-031512-a typical application schematic bill of materials item part number manufacturer description qty. c1, c2, c3 c1005x5r0j225m tdk (1) 2.2f ceramic capacitor, 6.3v, x5r, size 0402 3 u1 mic5355/6-xxymme micrel, inc. (2) dual 500ma cap low-dropout, mi cropower linear regulator 1 notes: 1. tdk: www.tdk.com . 2. micrel, inc.: www.micrel.com .
micrel, inc. mic5355/6 march 2012 12 m9999-031512-a typical application schematic (continued) bill of materials item part number manufacturer description qty. c1, c2, c3 c1005x5r0j225m tdk (1) 2.2f ceramic capacitor, 6.3v, x5r, size 0402 3 u1 mic5355/6-xxyml micrel, inc. (2) dual 500ma cap low-dropout, mi cropower linear regulator 1 notes: 3. tdk: www.tdk.com . 4. micrel, inc.: www.micrel.com .
micrel, inc. mic5355/6 march 2012 13 m9999-031512-a pcb layout recommendations (mme package) top layer bottom layer
micrel, inc. mic5355/6 march 2012 14 m9999-031512-a pcb layout recommendations (ml package) top layer bottom layer
micrel, inc. mic5355/6 march 2012 15 m9999-031512-a package information 8-pin epad msop (mme) 8-pin epad 3mm x 3mm mlf ? (ml)
micrel, inc. mic5355/6 march 2012 16 m9999-031512-a package information (continued) red circle indicates thermal via. size should be .300 ? .350mm in diameter, 1/00mm pitch, and it should be connected to gnd plane for maximum thermal performance. 8-pin epad msop (mme)
micrel, inc. mic5355/6 march 2012 17 m9999-031512-a package information (continued) red circle indicates thermal via. size should be .300 ? .350mm in diameter, 1/00mm pitch, and it should be connected to gnd plane for maximum thermal performance. 8-pin epad 3mm x 3mm mlf ? (ml)
micrel, inc. mic5355/6 march 2012 18 m9999-031512-a 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 expre ss, implied, arising by estoppel or other wise, to any intellectual property rights is granted by this document. except as provided in micrel?s terms and conditions of sale for such products, mi crel assumes no liability whatsoever, and micrel disclaims any express or implied warranty relating to the sale and/or use of micrel products including l iability or warranties relating to fitness for a particular purpose, merchantability, or infringement of an y patent, copyright or other intellectual p roperty right. 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 pers onal injury. life support devices or system s 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. ? 2012 micrel, incorporated.

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