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mic94310 200ma ldo with ripple blocker ? technology micrel inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? tel +1 (408) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micrel.com ripple blocker is a trademark of micrel, inc mlf and micro leadframe are registered trademarks of amkor technology, inc. february 2012 m9999-020612-a 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 x 0.88mm 4-ball csp or a 4-pin 1.2mm x 1.6mm thin mlf ? , the mic94310 has a junction operating temperature range of ?40 c to +125 c. data sheets and support documentation can be found on micrel?s web site at: www.micrel.com . features ? 1.8v to 3.6v input voltage range ? 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 x 0.88mm 4-ball csp ? 1.2mm x 1.6mm, 4-pin thin mlf ? ? logic-controlled enable pin ? ? 40 c to +125 c junction temperature range applications ? smart phones ? 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
micrel, inc. mic94310 february 2012 2 m9999-020612-a ordering information part number marking code output voltage package 2,3 lead finish mic94310-4ycs 1z 1.2v 0.88mm x 0.88mm csp pb-free mic94310-fycs 2z 1.5v 0.88mm x 0.88mm csp pb-free mic94310-gycs 1 z9 1.8v 0.88mm x 0.88mm csp pb-free mic94310-dycs 1 z8 1.85v 0.88mm x 0.88mm csp pb-free mic94310-jycs 1 z7 2.5v 0.88mm x 0.88mm csp pb-free mic94310-mycs 1 z6 2.8v 0.88mm x 0.88mm csp pb-free mic94310-nycs 1 z5 2.85v 0.88mm x 0.88mm csp pb-free mic94310-pycs z4 3.0v 0.88mm x 0.88mm csp pb-free mic94310-sycs z3 3.3v 0.88mm x 0.88mm csp pb-free mic94310-4ymt 31t 1.2v 1.2mm x 1.6mm thin mlf ? pb-free mic94310-fymt 32t 1.5v 1.2mm x 1.6mm thin mlf ? pb-free mic94310-gymt 31g 1.8v 1.2mm x 1.6mm thin mlf ? pb-free mic94310-dymt 1 31d 1.85v 1.2mm x 1.6mm thin mlf ? pb-free mic94310-jymt 1 31j 2.5v 1.2mm x 1.6mm thin mlf ? pb-free mic94310-mymt 1 31m 2.8v 1.2mm x 1.6mm thin mlf ? pb-free mic94310-nymt 1 31n 2.85v 1.2mm x 1.6mm thin mlf ? pb-free mic94310-pymt 31p 3.0v 1.2mm x 1.6mm thin mlf ? pb-free MIC94310-SYMT 31s 3.3v 1.2mm x 1.6mm thin mlf ? pb-free notes: 1. contact micrel marketing for availability. 2. thin mlf ? = pin 1 identifier. 3. thin mlf ? is a green rohs-compliant package. lead fini sh is nipdau. mold compound is halogen free.
micrel, inc. mic94310 february 2012 3 m9999-020612-a pin configuration 4-ball 0.88mm 0.88mm csp (cs) 4-pin 1.2mm 1.6mm thin mlf ? (mt) top view top view pin description pin number (thin mlf ? ) ball number (csp) pin name pin name 1 a2 vout power switch output. 2 b2 gnd ground. 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 a1 vin power switch input and chip supply. ep ? epad exposed heatsink pad. connec t to ground for best thermal performance.
micrel, inc. mic94310 february 2012 4 m9999-020612-a functional block diagram
micrel, inc. mic94310 february 2012 5 m9999-020612-a absolute maximum ratings (1) input voltage (v in ) .............................................. -0.3 to +4v output voltage (v out ) .................... ?0.3 to v in +0.3v or +4v enable voltage (v en )...................... ?0.3 to v in +0.3v or +4v lead temperature (soldering, 10s )............................ 260c storage temperature (t s).........................?65c to +150c esd rating (3) .................................................................. 3kv operating ratings (2) input voltage (v in )........................................ +1.8v to +3.6v enable voltage (v en ).............................................. 0v to v in junction temperature (t j ) ........................ ?40c to +125c junction thermal resistance thin mlf ? ( ja )................................................173c/w csp ( ja ) .........................................................250c/w electrical characteristics (4) v in = v en = v out + 500mv (v in = v en = 3.6v for v out ? 3.1v); i out = 1ma; c out = 1f; t a = 25c, bold values indicate ?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 ?3 1 +3 % dropout voltage v in to v out dropout at 100ma output current v in to v out dropout at 200ma output current 20 40 50 100 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 f = 100khz, i out = 100ma f = 1mhz, i out = 100ma f = 10mhz, i out = 100ma 85 68 57 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 low 0.4 v input logic high 1.0 v input current 0.01 1 a notes: 1. exceeding the absolute maximum rating may damage the device. 2. the device is not guaranteed to function outside its operating rating. 3. devices are esd sensitive. handling pr ecautions recommended. human body model, 1.5k ? in series with 100pf. 4. specification for packaged product only.
micrel, inc. mic94310 february 2012 6 m9999-020612-a 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
micrel, inc. mic94310 february 2012 7 m9999-020612-a typical characteristics (continued) dropout voltage vs. output current 0 5 10 15 20 25 30 35 dropout voltage (mv) -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 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 0 25 50 75 100 125 150 175 200 output current (ma) output voltage vs. output current 1.700 1.725 1.750 1.775 1.800 1.825 1.850 1.875 1.900 output voltage vs. input voltage 1.60 1.65 1.70 1.75 1.80 1.85 1.90 1.95 2.00 0 20 40 60 80 100 120 140 160 180 200 output voltage (v) output current (ma) 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 output voltage (v) input voltage (v) i out = 200ma v in = 3.6v c in = c out = 1f ground current vs. output current 150 155 160 165 170 175 ground current ( a) 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 out = 1f v out = 1.8v noise (10hz to 100khz) = 82.55v rms 10 100 1k 10k 100k 1m 0 20 40 60 80 100 120 140 160 180 200 output current (ma) v in =2.8v c in = c out =1f ground current vs. input voltage 120 130 140 150 160 170 180 190 ground current ( a) 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 input voltage (v) i out = 100ma i out = 200ma c in = c out =1f
micrel, inc. mic94310 february 2012 8 m9999-020612-a functional characteristics
micrel, inc. mic94310 february 2012 9 m9999-020612-a application information the mic94310 is a very-high psrr, fixed-output, 200ma 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 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. 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 in order to maintain stability, the mic94310 requires an output capacitor of 0.47f or greater. for optimal ripple rejection performance a 1f capacitor is recommended. the design is optimized for use with low-esr ceramic chip capacitors. high-esr capacitors are not recommended because they may cause high-frequency oscillation. the output capacit or can be increased, but performance has been optimized for a 1f 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 operat ing 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 temperature 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 mic94310 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 t he 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 the equation: p d = (v in ? v out1 ) i out + v in i gnd because this device is cmos and the ground current is typically <170a 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 ? 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 following basic equation: ? ? ? ? ? ? ? ? ? = ja a j(max) d(max) tt p t j(max) = 125c, the maximum junction temperature of the die, ja thermal resistance = 173c/w for the thin mlf ? 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. the maximum power dissipation must not be exceeded for proper operation.
micrel, inc. mic94310 february 2012 10 m9999-020612-a 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 = (125c ? t a )/(173c/w) t a = 101c therefore, the maximum ambient operating temperature allowed in a 1.2mm x 1.6mm thin mlf ? package is 101c. 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 for more information about micrel?s ripple blocker? products, go to: http://www.micrel.com/rippleblocker/ http://www.micrel.com/page.do?page=/product- info/products/mic94300.jsp http://www.micrel.com/page.do?page=/product- info/products/mic94310.jsp
micrel, inc. mic94310 february 2012 11 m9999-020612-a evaluation board schematic bill of materials item part number manufacturer description qty. c1, c2 grm155r61a105ke15d murata (1) capacitor, 1f ceramic, 10v, x7r, size 0402 2 u1 mic94310xx-ymt micrel, inc. (2) 200ma ripple blocker ? with fixed output voltage 1 no tes: 1. murata tel: www.murata.com . 2. micrel, inc.: www.micrel.com .
micrel, inc. mic94310 february 2012 12 m9999-020612-a package information 1 4-ball 0.88mm 0.88mm wl-csp (cs) no te: 1. package information is correct as of the publication date. for updates and most current information, go to www.micrel.com .
micrel, inc. mic94310 february 2012 13 m9999-020612-a package information 1 (continued) 4-pin 1.2mm 1.6mm thin mlf ? (mt) 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 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 impla 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. can nt ? 2012 micrel, incorporated.

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