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mic5524 high - performance 500ma ldo in thin dfn package micrel inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? tel +1 (408) 944 - 0800 ? fax + 1 (408) 474 - 1000 ? http://www.micrel.com may 15, 2013 revis ion 1. 0 general description the mic5524 is a low - power, cap, low dropout regulator designed for opt imal performance in a very - small footprint. it is capable of sourcing 500ma of output current and only draws 38a of operating current to do so. the mic5 524 includes an a uto - discharge feature on the output that is activated when the enable pin is low and it has an internal pull d own resistor on the enable pin that will disable the output when the enable pin is left floating, this is ideal for applications where the control signal is floating during processor boot up. this high - performance ldo offers fast transient response and goo d psrr in a 1 mm 1 mm t hin (0.4mm ht.) dfn package. ideal for battery - op erated applications, the mic5524 offers 2 % accuracy, extremely low dropout voltage ( 260 mv @ 50 0ma), and can regulate output voltages down to 1.0v. equipped with a ttl logic - compatible enable pin, the mic5524 can be put into a zero - off - mode current state, drawing no current when disabled. the mic5524 is a cap design, operating with very small ceramic output capacitors for stability, reducing required b oard space and component cost for space - critical applications. the mic5524 has an operating junction temp erature range of ? 40c to 125c . datasheets and support documentation are available on micrel?s web site at : www.micrel.com . features ? input voltage range: 2.5v to 5.5v ? fixed output voltages down to 1.0v ? 500ma guaranteed output current ? high output initial accuracy ( 1 %) ? high psrr 80db ? low quiescent current 38a ? stable with 2.2 f ceramic output capacitors ? low dropout voltage 260mv @ 500ma ? auto d ischarge and internal enable p ulldown ? thermal - shutdown and current - limit protection ? 4 - pin 1mm x 1 mm t hin dfn package applications ? portable communication equipment ? dsc, gps, pmp, and pdas ? portable medical devices ? 5v pol applications typical application
micrel, inc. mic5524 may 15, 2013 2 revision 1.0 ordering information part number marking code output voltage (1) temperature range package (2, 3) mic5524 - 1.2ymt c9 1.2v ? 40c to +125c 4 - pin 1mm 1mm tdfn mic5524 - 1.8ymt c6 1.8v ? 40c to +125c 4 - pin 1mm 1mm tdfn mic5524 - 2.8ymt 4c 2.8v ? 40c to +125c 4 - pin 1mm 1mm tdfn mic5524 - 3.0ymt 3c 3.0v ? 40c to +125c 4 - pin 1mm 1mm tdfn mic5524 - 3.3ymt c3 3.3v ? 40c to +125c 4 - pin 1mm 1mm tdfn note: 1. other voltages available. contact micrel for details. 2. thin dfn = pin 1 identifier. 3. thin dfn is a green, rohs - compliant package. lead finish is nipdau. mold compound is halogen free. pin configuration 4 - pin 1 mm 1mm thin dfn (mt ) (top view) pin description pin number pin name pin function 1 v out output voltage. when disabled t he mic5524 swit ches in an inte rnal 25? load to discharge the external capacitors. 2 gnd ground . 3 en enable input. active high. high = on; low = off. the mic5524 has an internal 4m? pulldown and this pin can be left floating. 4 vin supply input. ep epad exposed heatsink pad. connect to gnd.
micrel, inc. mic5524 may 15, 2013 3 revision 1.0 absolute maximum ratings ( 4 ) supply voltage (v in ) .......................................... ? 0 .3 v to 6 v enable voltage (v en ). ........................................ ? 0.3v to v in power dissipation (p d ) ........................... internally limited (6) lead temperature (soldering, 1 0s ) ............................ 260c junction temperature (t j ) ........................ ? 40c to +150 c storage temperature (t s ) ......................... ? 65c to +150c esd rating ( 7) .................................................................. 3 kv operating ratings ( 5 ) supply voltage (v in ) ......................................... 2.5 v to 5.5 v enable voltage (v en ) .............................................. 0v to v i n junction temperature (t j ) ........................ ? 40c to + 12 5c junction thermal resistance 1 mm 1 mm thin dfn - 4 ( ja ) ......................... 250 c/w electrical characteristics ( 8 ) v in = v en = v out + 1v; c in = c out = 2.2 f; i out = 100 a ; t j = 25c, bold values indicate ? 40c to 125 c, unless noted. parameter condition min . typ . max . units output voltage accuracy variation from nominal v out ? 2.0 1 +2.0 % variation from nominal v out ? 3 .0 +3 .0 line regulatio n v in = v out +1v to 5.5v ; i out = 100a 0.02 0.3 %/v load regulation ( 9 ) i out = 100 a to 500ma 1 0 mv dropout voltage ( 10 ) i out = 150ma i out = 500ma 80 260 175 500 mv ground pin current ( 11 ) i out = 0ma i out = 500ma 38 42 55 a ground pin current in shutdown v en = 0v 0.05 1 a ripple rejection f = 100 hz 80 db f = 1khz 65 db current limit v out = 0v 525 800 ma output voltage noise f = 10hz to 100khz 80 v rms auto - discharge nfet resistance v en = 0v; v in = 3.6v i out = ? 3ma 25 ? enable input enable pulldown resistor 4 0? enable input voltage logic low 0.2 v logic high 1.2 enable input current v en = 0v 0.01 1 a v en = 5.5 v 1.4 2 turn -o n time i out = 1 5 0 ma 50 125 s notes: 4. exceeding the absolute maximum rating can damage the device. 5. the device is not guaranteed to function outside its operating rating. 6. 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 temperature, and the regulator will go into thermal shutdown. 7. devices are esd sensitive. handling precautions a re recommended. human body model, 1.5k in series with 100pf. 8. specification for packaged product only. 9. regulation is measured at constant junction temperature using low duty cycle pulse testing. changes in output vol tage due to heating effects are covered by the thermal regulation specification. 10. dropout voltage is defined as the input - to - output differential at which the output voltage drops 2% below its nominal value measured at 1v differential. for outputs below 2.5v, dropout voltage is the input - to - output differential with the minimum input voltage 2.5v. 11. ground pin current is the regulator quiescent current. the total current drawn from the supply is the sum of the load current plus the ground pin current.
micrel, inc. mic5524 may 15, 2013 4 revision 1.0 typical characteristics -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 100 1,000 10,000 100,000 1,000,000 10,000,000 psrr (db) frequency (hz) power supply rejection ratio c out = 2.2f c in = 2.2f v in = 4.3v v out = 3.3v 500ma 10 100 1k 10k 100k 1m i out = 300ma i out = 150ma 100a 10m 0 20 40 60 80 100 120 140 160 180 200 220 240 260 0 50 100 150 200 250 300 350 400 450 500 dropout voltage (mv) output current (ma) dropout voltage vs. output current v out = 3.3v c in = c out = 2.2f 0 50 100 150 200 250 300 350 -40 -20 0 20 40 60 80 dropout voltage (mv) temperature ( c) dropout voltage vs.temperature 50ma 300ma 500ma v out = 3.3v c in = c out = 2.2f 20 25 30 35 40 45 50 55 2.5 3 3.5 4 4.5 5 5.5 ground current (a) supply voltage (v) ground current vs. supply voltage 500ma 100 a v en = v in = v out + 1 v out = 3.3v c in = c out = 2.2f 36 37 38 39 40 41 42 43 44 45 46 0 50 100 150 200 250 300 350 400 450 500 ground current (a) load current (ma) ground current vs. load current v in = v en = v out + 1 v out = 3.3v c in = c out = 2.2f 30 32 34 36 38 40 42 44 46 48 50 -40 -20 0 20 40 60 80 ground current (a) temperature ( c) ground current vs. temperature 100a 300ma 500ma v in = v en = v out + 1v v out = 3.3v c in = c out = 2.2f 3.10 3.15 3.20 3.25 3.30 3.35 3.40 3.45 3.50 0 100 200 300 400 500 output voltage (v) output current (ma) output voltage vs. output current v in = v en = v out + 1v v out = 3.3v c in = c out = 2.2f 2.5 2.6 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 2.5 3.0 3.5 4.0 4.5 5.0 5.5 output voltage (v) supply voltage (v) output voltage vs.supply voltage v in = v en = v out + 1 v out = 3.3v c in = c out = 2.2f 500ma 300ma 50ma 3.2 3.25 3.3 3.35 3.4 3.45 3.5 -40 -20 0 20 40 60 80 output voltage (v) temperature ( c) output voltage vs.temperature 500ma v in = v out + 1v v out = 3.3v c in =c out = 2.2f 300ma
micrel, inc. mic5524 may 15, 2013 5 revision 1.0 typical characteristics (continued) 0.001 0.01 0.1 1 10 noise v/hz frequency (hz) output noise spectral density (mic5524 - 3.3ymt) v in = v en1 = 4.5v c out = 2.2f v out = 3.3v 10 100 1k 10k 100k 1m 10m
micrel, inc. mic5524 may 15, 2013 6 revision 1.0 functional characteristics
micrel, inc. mic5524 may 15, 2013 7 revision 1.0 functional block diagram
micrel, inc. mic5524 may 15, 2013 8 revision 1.0 application information the mic5524 is a high - performance, low - power 500ma ldo. the mic5524 includes an auto - discharge circuit that is switched on when the regulator is disabled through the enable pin. the mic5524 also offers an internal pulldown resistor on the enable pin to ensure the output is disabled if the control signal is tri - stated. the mic5524 regulator is fully protected from damage due to fault conditions, offering linear current limiting and thermal shutdown. input capacitor the mic5524 is a high - performance, high - bandwid th device. a n input capacitor of 2.2 f is required from the input to ground to provide stability. low - esr ceramic capacitors provide optimal per formance at a minimum of space. additional high - frequency capacitors, such as small - valued npo dielectric - type c apacitors, 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 recommende d . output capacitor the mic5524 requires an output capacitor of 2.2 f or greater to maintain stability. the design is optimized for use with low - es r ceramic chip capacitors. high - esr capacitors are not recommended because they may cause high - frequency osci llation. the output capacitor can be increased, but performance has been optimized for a 2.2 f ceramic output capacitor and does not improve significantly with larger capacitance. 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% 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. no - load stability u nlike many other voltage regulators, the mic5524 remains stable and in regulation with no load. this is especially important in cmos ram keep - alive applications. enable/shutdown the mic5524 comes with an active - high enable pin that allows the regulator t o be disabled. forcing the enable pin low disables the regulator and sends it into a n off mode current state drawing virtually zero current . when disabled the mic5524 switches an internal 25? load on the regulator output to discharge the external capacitor . forcing the enable pin high enables the output voltage. the mic5524 has an internal pull down resistor on the enable pin to disable the output when the enable pin is floating. thermal considerations the mic5524 is designed to provide 500ma of continuous current in a very small package. maximum ambient operating temperature can be calculated based on the output current and the voltage drop across the part. for example if the input voltage is 3.6v, the output volt age is 3.3v, and the output current = 500ma. the actual power dissipation of the regulator circuit can be determined using equation 1 : p d = (v in v out )i out + v in i gnd eq. 1 because this device is cmos and the ground current is typically <100a over the load range, the power dissipation contrib uted by the ground current is < 1% and can be ignored equation 2 : w 150 . 0 p ma 500 v 3 . 3 v 6 . 3 p d d u eq. 2 to determine the maximum ambient operating temperature of the package, use the junction - to - ambient thermal resistance of the device equation 3 : ? ? 1 ? t ja a ) max ( j ) max ( d t t p eq. 3 t j(max) = 125c, the maximum junction temperature of the die, ja thermal resistance = 250c/w for the tdfn package.
micrel, inc. mic5524 may 15, 2013 9 revision 1.0 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 250 c/w. the maximum power dissipation must not be exceeded for proper operation. for example, when operating the mic5524 - 3.3ymt at an input voltage of 3.6v and a 500ma load with a minimum footprint layout, the maximum ambient operating temperature t a can be determined as in equation 4 : ( ) ( ) c 5 . 87 t w / c 250 / t c 125 w 15 . 0 a a = ? = eq. 4 therefore , the maximum ambient operating temperature allowed in a 1mm 1mm tdfn package is 99 c. 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 - drop out voltage regulators handbook. this information can be found on micrel's website at: http://www.micrel.com/_pdf/other/ldobk_ds.pdf
micrel, inc. mic5524 may 15, 2013 10 revision 1.0 typical application schematic bill of materials item part number manufacturer description qty. c1, c2 grm188r71a225ke15d murata ( 12 ) capacitor, 2.2f ceramic, 10v, x5r, size 0603 2 u1 mic5524 - x.xymt micrel, inc ( 13 ) high - performance 500ma ldo in thin dfn package 1 notes: 12. murata : www.murata.com . 13. micrel , inc.: www.micrel.com .
micrel, inc. mic5524 may 15, 2013 11 revision 1.0 pcb layout recommendations top layer bottom layer
micrel, inc. mic5524 may 15, 2013 12 revision 1.0 package information ( 14) and recommended landing pattern 4 - pin 1 mm 1mm thin dfn (mt ) note: 14. package information is correct as of the publication date. for updates and most current information, go to www.micrel.com .
micrel, inc. mic5524 may 15, 2013 13 revision 1.0 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 the accuracy or completeness of the information furnished in th is data sheet. this information is not intended as a warranty and micrel does not assume responsibility for its 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 otherwise, to any intellectual property rights is granted by this document. except as provided in micrel?s terms and conditions of sale for such products, micrel assumes no liability whatsoever, and micrel disclaims any express or implied warranty relating to the sale and/or use of micrel products including liability or warrantie s relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right . micrel products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. life 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 failur e to perform can be reasonably expected to result in a significant injury to the user. a purchaser?s use or sale of micrel products for use in life support appliances, devices or systems is a purchaser?s own risk a nd purchaser agrees to fully indemnify mic rel for any damages resulting from such use or sale. ? 20 13 micrel, incorporated.

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