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mic94310 200ma ldo with ripple blocker? technology general description the mic94310 ripple blocker ? is a monolithic integrated circuit that provides low - frequency ripple attenuation (switching noise rejection) to a regulated output voltage. this is important for applications where a dc/dc switching converter is required to lower or raise a battery voltage but where switching noise cannot be tolerated by sensitive downstream circuits such as in rf applications. the mic94310 maintains high power supply ripple rejection (psrr) with input voltages operating near the output voltage level to improve overall system efficiency. a low - voltage logic enable pin facilitates on/off control at typical gpio voltage levels. the mic94310 operates from an input voltage of 1.8v to 3.6v. packaged in a 0.88mm 0.88mm 4 - ball wl csp, a 4 - pin 1.2mm 1.6m m thin dfn, or a 5 - pin s ot - 23, the mic94310 has a junction operating temperature range of C 40 c to +125 c. datasheets and support documentation are available on micrels web site at : www.micrel.com . features ? 1 .8v to 3.6v input voltage rang e ? active noise rejection over a wide frequency band ? > 50db from 10hz to 10mhz at 200ma load ? rated to 200ma output current ? fixed output voltages ? current - limit and thermal - limit protected ? ultra - small 0.88mm 0.88mm 4 - ball wl csp ? 1.2mm 1.6mm 4 - pin thin dfn ? 5- pin sot - 23 ? logic - controlled enable pin ? ? 40 c to +125 c junction temperature range applications ? smartphones/smart books ? tablet pc/notebooks and webcams ? digital still and video cameras ? global positioning systems ? mobile computing ? automotive and industrial applications typical application psrr c out = 1f -120 -100 -80 -60 -40 -20 0 1.e+01 1.e+02 1.e+03 1.e+04 1.e+05 1.e+06 1.e+07 frequency (hz) psrr (db) i out = 200ma i out = 100ma i out = 10ma v in = 2.5v + 40mvpp v out = 1.8v 10 100 1k 10k 100k 1m 10m ripple blocker is a trademark of micrel, 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 september 11, 2014 rev ision 2.1 downloaded from: http:///
micrel, inc. mic94310 ordering information part number marking code output voltage package ( 1 , 2 ) lead finish mic94310 - 4ycs 1z 1.2v 0.88mm 0.88 mm wl csp pb-free mic94310 -fy cs 2z 1.5v 0.88mm 0.88mm wlcsp pb-free mic94310 -gy cs z9 1.8v 0.88mm 0.88mm wlcsp pb-free mic94310 -dy cs z8 1.85v 0.88mm 0.88mm wlcsp pb-free mic94310 - jycs z7 2.5v 0.88mm 0.88mm wlcsp pb-free mic94310 - lycs 3z 2.7v 0.88mm 0.88mm wlcsp pb-free mic94310 -my cs z6 2.8v 0.88mm 0.88mm wlcsp pb-free mic94310 - nycs z5 2.85v 0.88mm 0.88mm wlcsp pb-free mic94310 -py cs z4 3.0v 0.88mm 0.88mm wlcsp pb-free mic94310 -sy cs z3 3.3v 0.88mm 0.88mm wlcsp pb-free mic94310 - 4ymt 31t 1.2v 1.2mm 1.6mm thin dfn pb-free mic94310 -f ymt 32t 1.5v 1.2mm 1.6mm thin dfn pb-free mic94310 -g ymt 31g 1.8v 1.2mm 1.6mm thin dfn pb-free mic94310 -d ymt 31d 1.85v 1.2mm 1.6mm thin dfn pb-free mic94310 -j ymt 31j 2.5v 1.2mm 1.6mm thin dfn pb-free mic94310 -l ymt 31l 2.7v 1.2mm 1.6mm thin dfn pb-free mic94310 -m ymt 31m 2.8v 1.2mm 1.6mm thin dfn pb-free mic94310 -n ymt 31n 2.85v 1.2mm 1.6mm thin dfn pb-free mic94310 -p ymt 31p 3.0v 1.2mm 1.6mm thin dfn pb-free mic94310 -s ymt 31s 3.3v 1.2mm 1.6mm thin dfn pb-free mic94310 - 4ym5 v31 1.2v 5- pin sot - 23 pb-free mic94310 - gym5 w31 1.8v 5- pin sot - 23 pb-free mic94310 - mym5 z31 2.8v 5- pin sot - 23 pb-free mic94310 -sym5 x31 3.3v 5- pin sot - 23 pb-free note: 1. thin dfn = pin 1 identifier. 2. thin dfn is a green rohs - compliant package. lead finish is nipdau. mold compound is halogen free. september 11, 2014 2 revision 2 .1 downloaded from: http:///
micrel, inc. mic94310 pin configuration 0.88mm 0.88mm 4 - ball csp (cs) top view 1.2mm 1.6mm 4 - pin tdfn (mt) top view 5- pin sot - 23 (m5) top view pin description pin number (tdfn) pin number (sot- 23) ball number ( wlcsp ) pin name pin function 1 5 a2 vout power switch output. 2 2 b2 gnd ground. 3 3 b1 en enable input. a logic high signal on this pin enables the part. logic low disables the part. do not leave floating. 4 1 a1 vin power switch input and chip supply. C 4 C nc no connect. not internally connected. ep C C epad ex posed heatsink pad. connect to ground for best thermal performance. september 11, 2014 3 revision 2 .1 downloaded from: http:///
micrel, inc. mic94310 functional diagram september 11, 2014 4 revision 2 .1 downloaded from: http:///
micrel, inc. mic94310 absolute maximum ratings ( 3 ) input voltage (v in ) ........................................... C 0.3 to +4.0v output voltage (v out ) ................. C 0.3 to v in +0.3v or +4.0v enable voltage (v en ) ................... C 0.3 to v in +0.3v or +4.0v lead temperature (soldering, 10s) ............................ 260c storage temperature (t s) ......................... C 65c to +150c esd rating ( 5 ) .................................................................. 3kv operating ratings ( 4 ) supply voltage (v in ) ..................................... +1.8v to +3.6v enable voltage (v en ) .............................................. 0v to v in junction temperature (t j ) ........................ C 40c to +125c junction thermal resistance tdfn ( ja ) ....................................................... 173c/w wlcsp ( ja ) .................................................... 250c/w sot - 23 ( ja ) .................................................... 120c/w electrical characteristics ( 6 ) v in = v en = v out + 500mv (v in = v en = 3.6v for v out 3.1v); i out = 1ma; c out = 1f (ycs, ymt), c out = 10f (ym5); t a = 25c, bold values indicate C 40c t j +125c, unless noted. parameter condition min . typ . max . units input voltage 1.8 3.6 v output voltage accuracy variation from nominal v out C3 1 +3 % dropout voltage v in to v out dropout at 100ma output current 20 50 mv v in to v out dropout at 200ma output current 40 100 mv load regulation 1ma to 100ma 4 mv line regulation v in = v out + 500mv to 3.6v 0.01 0.5 % ground current no load to full load 170 250 a shutdown current v en = 0v 0.2 5 a v in ripple rejection f = 100hz, i out = 100ma 85 db f = 100khz, i out = 100ma 68 db f = 1mhz, i out = 100ma 57 db f = 10mhz, i out = 100ma 50 db current limit v out = 0v 250 400 700 ma total output noise 10hz to 100khz 83 v rms turn - on time 70 s enable input logic level 0.4 v input logic high 1.0 v input current 0.01 1 a notes: 3. exceeding the absolute maximum ratings may damage the device. 4. the device is not guaranteed to function outside its operating ratings. 5. devices are esd sensitive. handling precautions are recommended. human body model, 1.5k ? in series with 100pf. 6. specification for packaged product only. september 11, 2014 5 revision 2 .1 downloaded from: http:///
micrel, inc. mic94310 typical characteristics -120 -100 -80 -60 -40 -20 0 1.e+01 1.e+02 1.e+03 1.e+04 1.e+05 1.e+06 1.e+07 psrr (db) frequency (hz) psrr c out = 0.47f i out = 10ma i out = 200ma i out = 100ma v in = 2.5v + 40mvpp v out = 1.8v 10 100 1k 10k 100k 1m 10m -120 -100 -80 -60 -40 -20 0 1.e+01 1.e+02 1.e+03 1.e+04 1.e+05 1.e+06 1.e+07 psrr (db) frequency (hz) psrr c out = 0.47f v in = 3.6v v in = 2.5v v in = 2.0v v in = v in(nom) + 40mvpp load = 100ma v out = 1.8v 10 100 1k 10k 100k 1m 10m -120 -100 -80 -60 -40 -20 0 1.e+01 1.e+02 1.e+03 1.e+04 1.e+05 1.e+06 1.e+07 psrr (db) frequency (hz) psrr c out = 1f i out = 200ma i out = 100ma i out = 10ma v in = 2.5v + 40mvpp v out = 1.8v 10 100 1k 10k 100k 1m 10m -120 -100 -80 -60 -40 -20 0 1.e+01 1.e+02 1.e+03 1.e+04 1.e+05 1.e+06 1.e+07 psrr (db) frequency (hz) psrr c out = 1f v in = 3.6v v in = 2.5v v in = 2.0v v in = v in(nom) + 40mvpp load = 100ma v out = 1.8v 10 100 1k 10k 100k 1m 10m -120 -100 -80 -60 -40 -20 0 1.e+01 1.e+02 1.e+03 1.e+04 1.e+05 1.e+06 1.e+07 psrr (db) frequency (hz) psrr c out = 2.2f i out = 200ma i out = 100ma i out = 10ma v in = 2.5v + 40mvpp v out = 1.8v 10 100 1k 10k 100k 1m 10m -120 -100 -80 -60 -40 -20 0 1.e+01 1.e+02 1.e+03 1.e+04 1.e+05 1.e+06 1.e+07 psrr (db) frequency (hz) psrr c out = 2.2f v in = 3.6v v in = 2.5v v in = 2.0v v in = v in(nom) + 40mvpp load = 100ma v out = 1.8v 10 100 1k 10k 100k 1m 10m -120 -100 -80 -60 -40 -20 0 1.e+01 1.e+02 1.e+03 1.e+04 1.e+05 1.e+06 1.e+07 psrr (db) frequency (hz) psrr c out = 4.7f i out = 200ma i out = 100ma i out = 10ma v in = 2.5v + 40mvpp v out = 1.8v 10 100 1k 10k 100k 1m 10m -120 -100 -80 -60 -40 -20 0 1.e+01 1.e+02 1.e+03 1.e+04 1.e+05 1.e+06 1.e+07 psrr (db) frequency (hz) psrr c out = 4.7f v in = 3.6v v in = 2.5v v in = 2.0v v in = v in(nom) + 40mvpp load = 100ma v out = 1.8v 10 100 1k 10k 100k 1m 10m -120 -100 -80 -60 -40 -20 0 1.e+01 1.e+02 1.e+03 1.e+04 1.e+05 1.e+06 1.e+07 psrr (db) frequency (hz) psrr c out = 10f i out = 200ma i out = 100ma i out = 10ma v in = 2.5v + 40mvpp v out = 1.8v 10 100 1k 10k 100k 1m 10m september 11, 2014 6 revision 2 .1 downloaded from: http:///
micrel, inc. mic94310 typical characteristics (continued) -120 -100 -80 -60 -40 -20 0 1.e+01 1.e+02 1.e+03 1.e+04 1.e+05 1.e+06 1.e+07 psrr (db) frequency (hz) psrr c out = 10f v in = 3.6v v in = 2.5v v in = 2.0v v in = v in(nom) + 40mvpp load = 100ma v out = 1.8v 10 100 1k 10k 100k 1m 10m -120 -100 -80 -60 -40 -20 0 1.e+01 1.e+02 1.e+03 1.e+04 1.e+05 1.e+06 1.e+07 psrr (db) frequency (hz) psrr (varying c out ) c out = 2.2f c out = 1f c out = 0.47f v in = 2.5v + 40mvpp load = 100ma v out = 1.8v 10 100 1k 10k 100k 1m 10m dropout voltage vs. output current 0 5 10 15 20 25 30 35 0 25 50 75 100 125 150 175 200 output current (ma) dropout voltage (mv) output voltage vs. output current 1.700 1.725 1.750 1.775 1.800 1.825 1.850 1.875 1.900 0 20 40 60 80 100 120 140 160 180 200 output current (ma) output voltage (v) v in = 3.6v c in = c ou t = 1f output voltage vs. input voltage 1.60 1.65 1.70 1.75 1.80 1.85 1.90 1.95 2.00 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 input voltage (v) output voltage (v) i out = 200ma ground current vs. output current 150 155 160 165 170 175 0 20 40 60 80 100 120 140 160 180 200 output current (ma) ground current (a) v in =2.8v c in = c out =1f ground current vs. input voltage 120 130 140 150 160 170 180 190 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 input voltage (v) ground current (a) i out = 100ma i out = 200ma c in = c out =1f psrr (varying c out ) -120 -100 -80 -60 -40 -20 0 1.e+01 1.e+02 1.e+03 1.e+04 1.e+05 1.e+06 1.e+07 frequency (hz) psrr (db) c out = 2.2f c out = 10f c out = 4.7f v in = 2.5v + 40mvpp load = 100ma v out = 1.8v 10 100 1k 10k 100k 1m 10m output noise spectral density 0.01 0.10 1.00 10.00 1.e+01 1.e+02 1.e+03 1.e+04 1.e+05 1.e+06 frequency (hz) noise v/hz v in = v en = 3.1v c in = c ou t = 1f v ou t = 1.8v noise (10hz to 100khz) = 82.55v r ms 10 100 1k 10k 100k 1m september 11, 2014 7 revision 2 .1 downloaded from: http:///
micrel, inc. mic94310 functional characteristics september 11, 2014 8 revision 2 .1 downloaded from: http:///
micrel, inc. mic94310 application information the mic94310 is a very - high psrr, fixed - output, 200 ma ldo utilizing ripple blocker technology. the mic94310 is fully protected from damage due to fault conditions, offering linear current limiting and thermal shutdown. input capacitor the mic94310 is a high - performance, high - bandwidth device. an input capacitor of 0.47f is required fro m 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. 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 capacitance in order to maintain stability , t he mic94310 requires an output capacitor of 0.47 f or greater for the thin dfn and wlcsp packages and 10 f or greater for the sot - 23 package. for optimal ripple rejection performance a 1f capacitor is recommended for the csp and thin dfn packages, while a 10 f capacitor is recommended for the sot - 23 package. 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 oscillation. the output capacitor can be increased, but performance has been optimized for a 1 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 their value by as much as 50% and 60%, respectively, over their operating temperat ure ranges. to use a ceramic chip capacitor with the 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 the mic 9 4310 will remain stable and in regulation with no load. this is especially important in cmos ram keep - alive applications . enable/shutdown forcing the enable (en) pin low disables the mic94310 and sends it into a zero off mode current state. in this state, current consumed by the mic94310 goes nearly to zero. forcing en high enables the output voltage. the en pin uses cmos technology and cannot be left floating as it could cause an indeterminate state on the output. thermal considerations the mic94310 is designed to provide 200ma 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 2.5v, the output voltage is 1.8v, and the output current = 200ma. the actual power dissipation of the ripple blocker? can be determined using equation 1 : p d = (v in C v out1 ) i out + v in i gnd eq. 1 because this device is cmos and the ground current is typically <170 a over the load range, the power dissipation contributed by the ground current is <1% and can be ignored for this calculation. p d = (2.5v C 1.8v) 200ma p d = 0.14w to determine the maximum ambient operating temperature of the package, use the junction - to - ambient thermal resistance of the device and the equation 2: ? ?? ? ? ?? ? ? = ja a j(max) d(max) t t p eq. 2 t j(max) = 125 o c, the maximum junction temperature of the die, ja thermal resistance = 173 c/w for the thin dfn package. substituting p d for p d(max) and solving for the ambient operating temperature will give the maximum operating conditions for the regulator circuit. september 11, 2014 9 revision 2 .1 downloaded from: http:///
micrel, inc. mic94310 for proper operation, the maximum power dissipation must not be exceeded. for example, when operating the mic94310 - gymt at an input voltage of 2.5v and 200ma load with a minimum footprint layout, the maximum ambient operating temperature (t a ) can be determined as follows: 0.14w = (125 o c C t a )/(173 o c/w) t a = 101 oc therefore, the maximum ambient operating temperature allowed in a 1.2mm 1.6mm thin dfn package is 101 o c. 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 o n micrels website at: http://www.micrel.com/_pdf/other/ldobk_ds.pdf for more information about micrels ripple blocker products, please visit: http://www.micrel.com/index.php/en/products/power - management - ics/ldos/linear - power - filters.html http://www.micrel.com/index.php/en/products/power - management - ics/ldos/linear - power - filters/article/1 - mic94300.html http://www.micrel.com/index.php/en/products/power - management - ics/ldos/linear - power - filters/article/3 - mic94310.html september 11, 2014 10 revision 2 .1 downloaded from: http:///
micrel, inc. mic94310 evaluation board schematic bill of materials item part number manufacturer description qty. c1, c2 grm155r61a105ke15d murata (7 ) capacitor, 1 f ceramic, 10v, x7r, size 0402 2 u1 mic94310 - xx ymt micrel, inc. ( 8 ) 200ma ldo with ripple blocker technology 1 notes: 7. murata : www.murata.com . 8. micrel, inc.: www.micrel.com . september 11, 2014 11 revision 2 .1 downloaded from: http:///
micrel, inc. mic94310 package information and recommended landing pattern ( 9 ) 4- ball 0.88mm 0.88mm wlcsp ( cs ) note: 9. package information is correct as of the publication date. for updates and most current information, go to www.micrel.com . september 11, 2014 12 revision 2 .1 downloaded from: http:///
micrel, inc. mic94310 package information and recommended landing pattern ( 9 ) (continued) 4- pin 1.2mm 1.6mm thin dfn (mt) september 11, 2014 13 revision 2 .1 downloaded from: http:///
micrel, inc. mic94310 package information and recommended landing pattern ( 9 ) (continued) 5- pin sot - 23 (m5) september 11, 2014 14 revision 2 .1 downloaded from: http:///
micrel, inc. mic94310 micrel, inc. 2180 fortune drive san jose, ca 95131 usa tel +1 (408) 944 - 0800 fax +1 (408) 474 - 1000 we b http://www.micrel.com micrel, inc. is a leading global manufacturer of ic solutions for the worldwide high performance linear and power, lan, and t iming & communications markets. the companys products include advanced mixed - signal, analog & power semiconductors; high - performance communication, clock management, mems - based clock oscillators & crystal - less clock generators, ethernet switches, and physical layer transceiver ics. company customers include leading manufacturers of enterprise, consumer, industrial, mobile , telecommunications, automotive, and comp uter products. corporation headquarters and state - of - the - art wafer fabrication facilities are locat ed in san jose, ca, with regional sales and support offices and advanced technology design centers situated throughout the americas, europe, and asia. additionally, the company maintains an extensive network of distributors and reps worldwide. micrel mak es no representations or warranties with respect to the accuracy or completeness of the inf ormation furnished in this data sheet. this information is not intended as a warranty and micrel does not assume responsibility for its use. micrel reserves the righ t 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 micrels term s 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 mi crel products including liability or warranties relating to fitness for a particul ar 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 device s 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 re sult in a significant injury to the user. a purchasers use or sale of micrel products for use in life support appliances, devices or s ystems is a purchasers own risk and purchaser agrees to fully indemnify micrel for any damages resulting from suc h use or sale. ? 20 12 micrel, incorporated. september 11, 2014 15 revision 2 .1 downloaded from: http:///

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