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mic94325/45/55 500ma ldo with ripple blocker ? technology 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 general description the mic943x5 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 mic943x5 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 mic943x5 operates from an input voltage of 1.8v to 3.6v. the mic943x5 options include fixed (mic94345/55) or adjustable (mic94325) out put voltages. the mic94355 version offers an auto-discharge to discharge the output capacitor when the part is disabled. packaged in a 0.84mm x 1.32mm 6-ball csp or a 6-pin 1.6mm x 1.6mm thin dfn, the mic943x5 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 5mhz at 500ma load ? rated to 500ma output current ? fixed and adjustable output voltages ? optional output auto-discharge when disabled ? current-limit and thermal-limit protected ? ultra-small 0.84mm x 1.32mm 6-ball csp ? 1.6mm x 1.6mm, 6-pin thin dfn ? 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 october 2012 m9999-102512-a mic94355 psrr c out = 4.7f -120 -100 -80 -60 -40 -20 0 10 100 1,000 10,000 100,00 0 1,000,0 00 10,000, 000 frequency (hz) psrr (db) v in = 2.8v + 40mvpp v out = 1.8v c out = 4.7f 10 100 1k 10k 100k 1m 10m 10ma 200ma 500ma
micrel, inc. mic94325/45/55 october 2012 2 m9999-102512-a ordering information part number marking code output voltage auto discharge package 1 lead finish mic94325ymt 2r adj 1.6mm x 1.6mm thin dfn pb-free mic94345-4ycs* l4 1.2v 0.84mm x 1.32mm csp pb-free mic94345-fycs* lf 1.5v 0.84mm x 1.32mm csp pb-free mic94345-gycs* x1 1.8v 0.84mm x 1.32mm csp pb-free mic94345-mycs* x2 2.8v 0.84mm x 1.32mm csp pb-free mic94345-sycs* x3 3.3v 0.84mm x 1.32mm csp pb-free mic94345-4ymt* 4l 1.2v 1.6mm x 1.6mm thin dfn pb-free mic94345-fymt* fl 1.5v 1.6mm x 1.6mm thin dfn pb-free mic94345-gymt* 1x 1.8v 1.6mm x 1.6mm thin dfn pb-free mic94345-mymt* 2x 2.8v 1.6mm x 1.6mm thin dfn pb-free mic94345-symt* 3x 3.3v 1.6mm x 1.6mm thin dfn pb-free MIC94355-4YCS* g9 1.2v yes 0.84mm x 1.32mm csp pb-free mic94355-fycs* g0 1.5v yes 0.84mm x 1.32mm csp pb-free mic94355-gycs* g1 1.8v yes 0.84mm x 1.32mm csp pb-free mic94355-mycs* g2 2.8v yes 0.84mm x 1.32mm csp pb-free mic94355-sycs* g3 3.3v yes 0.84mm x 1.32mm csp pb-free mic94355-4ymt* 9g 1.2v yes 1.6mm x 1.6mm thin dfn pb-free mic94355-fymt* 0g 1.5v yes 1.6mm x 1.6mm thin dfn pb-free mic94355-gymt 2g 1.8v yes 1.6mm x 1.6mm thin dfn pb-free mic94355-mymt* 7g 2.8v yes 1.6mm x 1.6mm thin dfn pb-free mic94355-symt* 8g 3.3v yes 1.6mm x 1.6mm thin dfn pb-free notes: 1. thin dfn is a green rohs-compliant package. lead finish is nipdau. mold compound is halogen free. contact micrel marketing for availability.
micrel, inc. mic94325/45/55 october 2012 3 m9999-102512-a pin configuration 6-ball 0.84mm ? 1.32mm csp (cs) 6-pin 1.6mm ? 1.6mm thin dfn (mt) ball view top view note: 1. thin dfn x = pin 1 identifier. pin description pin number (thin dfn) fixed pin number (thin dfn) adjustable ball number (csp) fixed pin name pin name 1, 2 1 a2, b2 vout power switch output. - 2 - adj adjust input. connect to resistive divider at vout to set the output voltage. do not leave floating. 3 3 c2 gnd ground. 4 4 c1 en enable input. a logic high signal on this pin enables the part. logic low disables the part. do not leave floating. 5, 6 5, 6 a1, b1 vin power switch input and chip supply. ep ep ? epad exposed heatsink pad. connect to ground plane for best thermal performance.
micrel, inc. mic94325/45/55 october 2012 4 m9999-102512-a functional block diagrams mic94325 adjustable output mic94345 fixed output
micrel, inc. mic94325/45/55 october 2012 5 m9999-102512-a functional block diagrams (continued) mic94355 fixed output with auto-discharge
micrel, inc. mic94325/45/55 october 2012 6 m9999-102512-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 dfn ( ? ja ) ...................................................92c/w csp ( ? ja ) .........................................................160c/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 = 4.7f; 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 range mic94325 1.2 3.4 v output voltage accuracy variation from nominal v out ?3 1 +3 % adjust reference mic94325 1.1 v dropout voltage v in to v out dropout at 50ma output current v in to v out dropout at 500ma output current 10 100 200 mv load regulation 1ma to 500ma 10 mv line regulation v in = v out + 500mv to 3.6v, i out = 100ma 0.1 1 % ground current i out = 100a 170 250 a shutdown current v en = 0v 0.2 5 a f = 100hz 85 f = 1khz 85 f = 100khz 57 f = 1mhz 60 v in ripple rejection f= 5mhz 50 db current limit v out = 0v 530 800 1100 ma total output noise 10hz to 100khz 83 v rms turn-on time 100 150 s auto discharge nfet resistance v in = 3.6v, v en = 0v, i out = -3ma mic94355 only 50 ? enable input logic low 0.35 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. mic94325/45/55 october 2012 7 m9999-102512-a typical characteristics mic94325 psrr c out = 4.7f c ff = 3.3nf -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 10 100 1,000 10,000 100,00 0 1,000,0 00 10,000, 000 frequency (hz) psrr (db) v in = 2.7v + 40mvpp v out = 2.2v c out = 4.7f c ff = 3.3nf 500ma 10 100 1k 10k 100k 1m 10m 300ma 10ma mic94325 psrr c out = 4.7f , c ff = 10nf -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 1.00e+01 1.00e+03 1.00e+05 1.00e+07 frequency (hz) psrr (db) v in = 2.4v + 40mvpp v out = 2.2v c out = 4.7f c ff = 10nf 500ma 10ma 10 100 1k 10k 100k 1m 10m 300ma mic94325 psrr c out = 4.7f , c ff = 10nf -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 10 100 1,000 10,000 100,00 0 1,000,0 00 10,000, 000 frequency (hz) psrr (db) v in = 2.7v + 40mvpp v out = 2.2v c out = 4.7f c ff = 10nf 500ma 10ma 10 100 1k 10k 100k 1m 10m 300ma mic94355 psrr c out = 4.7f -120 -100 -80 -60 -40 -20 0 10 100 1,000 10,000 100,00 0 1,000,0 00 10,000, 000 frequency (hz) psrr (db) v in = 2.5v + 40mvpp v out = 1.8v c out = 4.7f 10 100 1k 10k 100k 1m 10m 200ma 500ma 10ma mic94325 psrr c out = 4.7f c ff = 100nf -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 10 100 1,000 10,000 100,00 0 1,000,0 00 10,000, 000 frequency (hz) psrr (db) v in = 2.7v + 40mvpp v out = 2.2v c out = 4.7f c ff = 100nf 10 100 1k 10k 100k 1m 10m 500ma 300ma 10ma mic94355 psrr c out = 4.7f -120 -100 -80 -60 -40 -20 0 10 100 1,000 10,000 100,00 0 1,000,0 00 10,000, 000 frequency (hz) psrr (db) v in = 2.8v + 40mvpp v out = 1.8v c out = 4.7f 10 100 1k 10k 100k 1m 10m 10ma 200ma 500ma mic94355 psrr c out = 10f -120 -100 -80 -60 -40 -20 0 10 100 1,000 10,000 100,00 0 1,000,0 00 10,000, 000 frequency (hz) psrr (db) v in = 2.5v + 40mvpp v out = 1.8v c out = 10f 1k 10k 100k 1m 10m 10 100 10ma 200ma 500ma mic94355 psrr c out = 10f -120 -100 -80 -60 -40 -20 0 10 100 1,000 10,000 100,00 0 1,000,0 00 10,000, 000 frequency(hz) psrr (db) v in = 2.8v + 40mvpp v out = 1.8v c out = 10f 500ma 200ma 1k 10k 100k 1m 10m 10 100 10ma mic34355 psrr c out = 4.7f -120 -100 -80 -60 -40 -20 0 10 100 1,000 10,000 100,00 0 1,000,0 00 10,000, 000 frequency (hz) psrr (db) v in = 3.6v + 40mvpp v out = 1.8v c out = 4.7f 10ma 200ma 1k 10k 100k 1m 10m 10 100 500ma
micrel, inc. mic94325/45/55 october 2012 8 m9999-102512-a typical characteristics (continued) output voltage vs. output current 1.6 1.65 1.7 1.75 1.8 1.85 1.9 1.95 2 0 50 100 150 200 250 300 350 400 450 500 output current (ma) output voltage (v) v in = 2.8v c in = c out = 4.7f ground current vs. output current 150 155 160 165 170 175 180 185 190 195 200 0 50 100 150 200 250 300 350 400 450 500 output current (ma) ground current (a) mic94355ymt output noise spectral density 0.001 0.01 0.1 1 10 10 100 1,000 10,000 100,00 0 1,000,0 00 10,000, 000 frequency (hz) moise v/ hz v in = v en = 3v c out = 4.7f/10v 1k 10k 100k 1m 10m 10 100 mic94355 psrr c out = 10f -120 -100 -80 -60 -40 -20 0 10 100 1,000 10,000 100,00 0 1,000,0 00 10,000, 000 frequency (hz) psrr (db) v in = 3.6v + 40mvpp v out = 1.8v c out = 10f 100ma 1k 10k 100k 1m 10m 10 100 10ma 200ma dropout voltage vs. load 0 10 20 30 40 50 60 70 80 90 100 0 50 100 150 200 250 300 350 400 450 500 load (ma) dropout voltage (mv) v out = 1.8v c in = c out = 4.7f ground current vs. input voltage 120 130 140 150 160 170 180 190 200 210 220 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 input voltage (v) ground current (a) 500ma 50ma c in = c out = 1f 300ma 100ma
micrel, inc. mic94325/45/55 october 2012 9 m9999-102512-a functional characteristics
micrel, inc. mic94325/45/55 october 2012 10 m9999-102512-a application information the mic943x5 family of products is a very-high psrr, fixed-output, 500ma ldo utilizing ripple blocker technology. the mic943x5 is fully protected from damage due to fault conditions, offering linear current limiting and thermal shutdown. input capacitor the mic943x5 is a high-performance, high-bandwidth device. an input capacitor of 4.7f 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 mic943x5 requires an output capacitor of 4.7f or greater. for optimal input voltage ripple rejection performance a 4.7f 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 capacitor can be increased, but performance has been optimized for a 4.7f 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 mic943x5 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 mic943x5 and sends it into a ?zero? off mode current state. in this state, current consumed by the mic943x5 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. for the mic94325 adjustable part, the turn-on time is affected by the selection of the external feedback resistors and feed-forward capacitor. the relationship is approximately 2.2 x r2 x cff, where r2 is the bottom resistor (connected from adj to gnd) and cff is the capacitor connected across r1 (from vout to adj). for stability, the feed-forward capacitor must be greater than 1nf. 10nf is recommended for best performance. when disabled, the mic94355 switches a 50 ? (typical) load on the regulator output to discharge the external capacitors. adjustable regulator application the mic94325 output voltage can be adjusted by using two external resistors (figure 1). the resistors set the output voltage based on the following equation: ? 1 ? r2 r1 1vv adj out v adj = 1.1v figure 1. adjustable output voltage thermal considerations the mic943x5 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 2.5v, the output voltage is 1.8v, and the output current = 500ma. the actual power dissipation of the ripple blocker? can be determined using the equation:
micrel, inc. mic94325/45/55 october 2012 11 m9999-102512-a p d = (v in ? v out1 ) i out + v in i gnd for more information about micrel?s ripple blocker products, go to: 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. http://www.micrel.com/index.php/en/products/power- management-ics/ldos/lin ear-power-filters.html p d = (2.5v ? 1.8v) 500ma http://www.micrel.com/index.php/en/products/power- management-ics/ldos/linea r-power-filters/article/1- mic94300.html p d = 0.35w 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: http://www.micrel.com/index.php/en/products/power- management-ics/ldos/linea r-power-filters/article/3- mic94310.html ? ? ? ? ? ? ? ? ? ? ja a j(max) d(max) tt p t j(max) = 125c, the maximum junction temperature of the die, ja thermal resistance = 160c/w for the ycs package and 92c/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. the maximum power dissipation must not be exceeded for proper operation. for example, when operating the mic94325-gymt at an input voltage of 2.5v and 500ma load with a minimum footprint layout, the maximum ambient operating temperature t a can be determined as follows: 0.35w = (125c ? t a )/(92c/w) t a = 92c therefore, the maximum ambient operating temperature allowed in a 1.6mm x 1.6mm thin dfn package is 92c. 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.pdf http://www.micrel.com/_pdf/other/ldo%20sg.b.pdf
micrel, inc. mic94325/45/55 october 2012 12 m9999-102512-a typical application schematic (adjustable output) bill of materials item part number manufacturer description qty. c in , c out cl10a475k08nnnc samsung (1) capacitor, 4.7f ceramic, 16v, x5r, size 0603 2 c ff c1608x7r2ap/nk tdk (2) capacitor, 10nf ceramic, 50v, x7r, size 0603 1 r1, r2 crcw0402100kfked vishay (3) resistor, 100k ? , size 0603 2 u1 mic94325ymt micrel, inc. (4) 500ma ldo with ripple blocker technology 1 no tes: 1. samsung: http://www.semlcr.com . 2. tdk: www.tdk.com . 3. vishay: www.vishay.com . 4. micrel, inc.: www.micrel.com .
micrel, inc. mic94325/45/55 october 2012 13 m9999-102512-a typical application schematic (fixed output) bill of materials item part number manufacturer description qty. c in , c out cl10a475k08nnnc samsung (1) capacitor, 4.7f ceramic, 16v, x5r, size 0603 2 u1 mic94345-xxymt mic94355-xxymt micrel, inc. (2) 500ma ldo with ripple blocker technology 1 no tes: 1. samsung: http://www.semlcr.com/ . 2. micrel, inc.: www.micrel.com .
micrel, inc. mic94325/45/55 october 2012 14 m9999-102512-a package information (1) 6-ball 0.84mm ? 1.32mm 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. mic94325/45/55 october 2012 15 m9999-102512-a package information (1) (continued) 6-pin 1.6mm ? 1.6mm thin dfn (mt) n ote: 1. package information is correct as of the publication date. for updates and most current information, go to www.micrel.com .
micrel, inc. mic94325/45/55 october 2012 16 m9999-102512-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 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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