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mic5323 high psrr low noise 300ma cap ultra-low dropout ldo regulator micro leadframe and mlf are trademarks of amkor, inc. micrel inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? te l +1 (408) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micre l.com november 2011 1 m9999-110311b general description the mic5323 is a high-performance, 300ma ldo regula- tor, offering extremely high psrr and very low noise while consuming low ground current. ideal for battery operated applications, the mic5323 features 2% accuracy, extremely low dropout voltage (120mv @ 300ma), and low ground current at light load (typically 90a). when disabled, the mic5323 typically consumes less than 1a. the mic5323 is a cap design operating with small ceramic output capacitors for stability, thereby reducing required board space and component cost. the mic5323 is available in xed output voltages and adjustable output voltages in the super compact 6-pin 2mm 2mm thin mlf ? and thin sot-23-5 package. additional voltage options are available. contact micrel marketing. data sheets and support documentation can be found on micrel?s web site at www.micrel.com . features ? ultra low dropout voltage of 120mv @ 300ma ? input voltage range: 2.65 to 5.5v ? stable with ceramic output capacitor ? 300ma guaranteed output current ? low output noise ? 20vrms ? high psrr, up to 80db @1khz ? less than 30s turn-on time with c byp = 0.1f ? high output accuracy: 2.0% over temperature ? thermal shutdown protection ? current limit protection ? 6-pin 2mm 2mm thin mlf ? package ? thin sot-23-5 package applications ? cellular phones ? notebook and tablet computers ? fiber optic modules ? portable electronics ? instrumentation systems ? audio codec power supplies typical application power supply rejection ratio (c byp = 0.1f) -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 1.e+01 1.e+02 1.e+03 1.e+04 1.e+05 1.e+06 frequency (hz) psrr (db) v in = v out + 1v v out = 1.8v i out = 1ma i out = 100ma i out = 300ma
micrel, inc. mic5323 november 2011 2 m9999-110311b ordering information part number (1) marking (2) voltage junction temp. range (2) package (3) mic5323-1.8ymt 23g 1.8v ?40c to +125c 6-pin 2mm x 2mm thin mlf ? mic5323-2.8ymt 23m 2.8v ?40c to +125c 6-pin 2mm x 2mm thin mlf ? mic5323-3.3ymt 23s 3.3v ?40c to +125c 6-pin 2mm x 2mm thin mlf ? mic5323ymt 23a adj ?40c to +125c 6-pin 2mm x 2mm thin mlf ? mic5323-1.8yd5 231 8 1.8v ?40c to +125c thin sot23-5 mic5323-2.8yd5 232 8 2.8v ?40c to +125c thin sot23-5 mic5323-3.3yd5 233 3 3.3v ?40c to +125c thin sot23-5 notes: 1. for other output voltage and/or temper ature options, contact micrel marketing. 2. underbar/overbar symbols may not be to scale. 3. pin 1 identifier for 2x2 thin mlf ? is ? ? symbol .
micrel, inc. mic5323 november 2011 3 m9999-110311b pin configuration mic5323-x.xymt (fixed) 6-pin 2mm x 2mm thin mlf ? (mt) (top view) mic5323ymt (adjustable) 6-pin 2mm x 2mm thin mlf ? (mt) (top view) mic5323-x.xyd5 (fixed)tsot-23-5 (d5) (top view) pin description pin number thin mlf ? -6 adjustable pin number thin mlf ? -6 fixed pin number tsot23-5 fixed pin name pin description 1 1 3 en enable input: active high. hi gh = on, low = off. do not leave floating. 2 2 2 gnd ground. 3 3 1 vin supply input. 4 4 5 vout output voltage. 5 ? ? adj adjust input: connect to exte rnal resistor voltage divider network. ? 5 ? nc no connection for xed voltage parts. 6 6 4 byp reference bypass: connect external 0.1f capacitor to gnd for reduced output noise. may be left open. epad epad ? epad exposed heatsink pad: connect to ground plane for performance enhancement.
micrel, inc. mic5323 november 2011 4 m9999-110311b absolute maximum ratings (1) supply voltage (v in ) ............................................... 0v to 6v enable input voltage (v en )..................................... 0v to 6v power dissipation (p d ) ........................... internally limited (3) junction temperature (t j ) ........................?40c to +125c lead temperature (solde ring, 5sec .) ......................... 260c storage temperature (t s ) .........................?65c to +150c esd rating (4) .................................................................. 2kv operating ratings (2) supply voltage (v in ) ....................................... 2.65v to 5.5v enable input voltage (v en )..................................... 0v to v in junction temperature (t j ) ........................ ?40c to +125c junction thermal resistance 2mm x 2mm thin mlf ? 6 pin ( ja )....................93c/w tsot-23-5 ( ja ) ..............................................235c/w electrical characteristics (5) v in = v out + 1.0v; c out = 2.2f; i out = 100a; t j = 25c, bold values indicate ?40c to +125c, unless noted. parameter condition min typ max units ouput voltage accuracy variation from nominal v out , i out = 100a to 300ma ?2.0 +2.0 % line regulation v in = v out +1v to 5.5v 0.02 0.3 %/v load regulation (6) i out = 100a to 300ma 0.1 0.5 % i out = 50ma, v out > 2.8v 20 35 mv i out = 150ma, v out > 2.8v 60 85 mv i out = 300ma, v out > 2.8v 120 170 mv i out = 50ma, v out =< 2.8v 25 45 mv i out = 150ma, v out =< 2.8v 75 110 mv dropout voltage i out = 300ma, v out =< 2.8v 150 220 mv ground pin current (7) i out = 0 to 300ma 90 150 a ground pin current in shutdown v en = 0v 0.5 2 a f = 1khz; c out = 2.2f ceramic; c byp = 0.1f 80 db ripple rejection f = 10khz; c out = 2.2f ceramic; c byp = 0.1f 65 db current limit v out = 0v 350 600 900 ma output voltage noise c out =2.2f, c byp = 0.1f, 10hz to 100khz 20 vrms turn-on time c out = 2.2f; c byp = 0.1f; i out = 300ma 30 150 s logic low 0.2 v enable input voltage logic high 1.2 v v il 0.2v 0.01 1 a enable input current v ih 1.2v 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. 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 temperat ure, and the regulator 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. 6. regulation is measured at constant j unction temperature using low duty cycle pul se testing, changes in output voltage due to heating effects are covered by the thermal regulation specification. 7. ground pin current is the regulator quiescent current. the to tal current drawn from the supply is the sum of the load curren t plus the ground pin current.
micrel, inc. mic5323 november 2011 5 m9999-110311b typical characteristics power supply rejection ratio (c byp =1f) -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 1.e+01 1.e+02 1.e+03 1.e+04 1.e+05 1.e+06 frequency (hz) psrr (db) v in = v out + 1v v out = 1.8v i out = 1ma i out = 100ma i out = 300ma power supply rejection ratio (c byp = 0.1f) -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 1.e+01 1.e+02 1.e+03 1.e+04 1.e+05 1.e+06 frequency (hz) psrr (db) v in = v out + 1v v out = 1.8v i out = 1ma i out = 100ma i out = 300ma power supply rejection ratio (c byp = 0.01f) -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 1.e+01 1.e+02 1.e+03 1.e+04 1.e+05 1.e+06 frequency (hz) psrr (db) v in = v out + 1v v out = 1.8v i out = 1ma i out = 100ma i out = 300ma ground current vs. input voltage 50 60 70 80 90 100 110 2.5 3.0 3.5 4.0 4.5 5.0 5.5 input voltage (v) ground current (a) i out = 300ma i out = 100a i out = 100ma v out = 1.8v ground current vs. output current 50 60 70 80 90 100 110 0 50 100 150 200 250 300 output current (ma) ground current (a) v in = v out + 1v v out = 1.8v ground current vs. temperature 50 60 70 80 90 100 110 -40-200 20406080100120 temperature (c) ground current (a) i out = 300ma i out = 100ma i out = 100a v in = v out + 1v v out = 1.8v output voltage vs. input voltage 1.5 2.0 2.5 3.0 3.5 2.5 3.0 3.5 4.0 4.5 5.0 5.5 input voltage (v) output voltage (v) i out = 300ma i out = 100a i out = 150ma v out = 2.8v current limit vs. input voltage 100 200 300 400 500 600 700 800 2.5 3.0 3.5 4.0 4.5 5.0 5.5 input voltage (v) current limit (ma) v out = 1.8v dropout voltage vs. output current 0 20 40 60 80 100 120 140 160 0 50 100 150 200 250 300 output current (ma) dropout (mv) v out = 2.8v
micrel, inc. mic5323 november 2011 6 m9999-110311b dropout voltage vs. temperature 0 20 40 60 80 100 120 140 160 -40-20 0 20406080100120 temperature (c) dropout (mv) i out = 300ma i out = 100ma i out = 200ma i out = 10ma v out = 2.8v output voltage vs. temperature 1.700 1.725 1.750 1.775 1.800 1.825 1.850 1.875 1.900 -40 -20 0 20 40 60 80 100 120 temperature (c) output voltage (v) v in = 5.5v v out = 1.8v i out = 100 a output noise spectral density 0.001 0.010 0.100 1.000 10.000 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 out + 1v v out = 1.8v c by p = 0.01f noise (10hz-100khz) = 18.7v output noise spectral density 0.001 0.010 0.100 1.000 10.000 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 out + 1v v out = 1.8v c by p = 0.1f noise (10hz-100khz) = 18.7v output noise spectral density 0.001 0.010 0.100 1.000 10.000 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 out + 1v v out = 1.8v c by p = 1f noise (10hz-100khz) = 18v
micrel, inc. mic5323 november 2011 7 m9999-110311b functional characteristics
micrel, inc. mic5323 november 2011 8 m9999-110311b functional diagram mic5323 block diagram ? fixed mic5323 block diagram ? adjustable
micrel, inc. mic5323 november 2011 9 m9999-110311b application information enable/shutdown the mic5323 comes with an active high enable pin that allows the regulator to be disabled. forcing the enable pin low disables the regulator and sends it into a ?zero? off mode current state. in th is state, current consumed by the regulator goes nearly to zero. forcing the enable pin high enables the output voltage. the active high enable pin uses cmos technology, and the enable pin cannot be left oating; a oating enable pin may cause an indeterminate state on the output. input capacitor the mic5323 is a high performance, high bandwidth device. therefore, it requires a well-bypassed input supply for optimal performance. a 2.2f capacitor is required from the input-to-g round to prov ide stability. low esr ceramic capacitors provide optimal perform- ance using a minimum amount of space. additional high frequency capacitors, such as small valued npo dielectric type capacitors, help lter out high-frequency noise, and are a good practice in any rf based circuit. output capacitor the mic5323 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 ce ramic output capacitor, and it does not improve signi cantly with larger capacitance. x7r/x5r dielectric type ceramic capacitors are recom- mended because of their tem perature performance. x7r type capacitors change capacitance by 15% over their operating temperature range, making them 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. bypass capacitor a capacitor can be placed from the noise bypass pin to ground to reduce output voltage noise. the capacitor bypasses the internal refere nce. a 0.1f capacitor is recommended for applications that require low noise outputs. the bypass capacitor can be increased, further reducing noise and improving psrr. turn-on time increases slightly with respect to bypass capacitance. a unique, quick-start circuit allows the mic5323 to drive a large capacitor on the bypass pin without signi cantly slowing turn on time. refer to the typical characteristics section for performance with different bypass capacitors. no load stability unlike many other voltage regulators, the mic5323 will remain stable and in regulation with no load. this is especially important in cmos ram keep alive applications. adjustable regulator application adjustable regulators use the ratio of two resistors to multiply the reference voltage to produce the desired output voltage. the mic5323 can be adjusted from 1.25v to 5.5v by using two ex ternal resistors (figure 1). the resistors set the output voltage based on the following equation: 1.25v = ref v r2 r1 + 1 ref v = out v ? ? ? ? ? ? ? figure 1. adjustable voltage application
micrel, inc. mic5323 november 2011 10 m9999-110311b thermal considerations the mic5323 is designed to provide 300ma 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. given that the input voltage is 3.3v, the output voltage is 2.8v and the output current = 300ma. the actual power dissipation of the regulator circuit can be determined using the equation: p d = (v in ? v out ) i out + v in i gnd because this device is cmos and the ground current is typically <100a over the load range, the power dissipation contributed by the ground current is < 1% and can be ignored for this calculation. p d = (3.3v ? 2.8v) 300ma p d = 0.15w 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 - where t j(max) is the maximum junction temperature, 125c, and ja represents the junction-to-ambient thermal resistance, 93c/w. substituting p d for p d(max) and solving for the ambient operating temperature will give the maximum operating conditions for the regulator circuit consuming p d watts. the maximum power dissipation must not be exceeded for proper operation. for example, when operating the mic5323-2.8ymt at an input voltage of 3.3v and 300ma load with a minimum footprint layout, the maximum ambient can be solved for as follows: ? ? ? ? ? ? ? ? ? ? ? c/w - c 25 w 15 . 93 t 1 0 a c 111 ? ? a t therefore, a 2.8v applicati on at 300ma of output current can accept an ambient operating temperature of 111c in a 6 pin 2mm x 2mm thin mlf ? package. for a full discussion of heat sinking and thermal effects on voltage regulators, refer to the ?regul ator 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. mic5323 november 2011 11 m9999-110311b typical application circuit (fixed output) bill of materials item part number manufacturer description qty. c1608x5r0j225k tdk (1) c1 grm188r60j225ke19d murata (2) 1 c1608x5r0j225k tdk (1) c2 grm188r60j225ke19d murata (2) ceramic capacitor, 2.2f, 6.3v, x5r, size 0603 1 c3 cl10b104kb8nnn samsung (3) ceramic capacitor, 100nf, 50v, x5r, size 0603 1 u1 mic5323ymt micrel, inc. (4) 300ma low noise ultra low dropout ldo 1 notes: 1. tdk: www.tdk.com 2. murata: www.murata.com 3. samsung: www.samsungsem.com 4. micrel, inc.: www.micrel.com
micrel, inc. mic5323 november 2011 12 m9999-110311b typical application circuit (adjustable output) bill of materials item part number manufacturer description qty. c1608x5r0j225k tdk (1) c1 grm188r60j225ke19d murata (2) 1 c1608x5r0j225k tdk (1) c2 grm188r60j225ke19d murata (2) ceramic capacitor, 2.2f, 6.3v, x5r, size 0603 1 c3 cl10b104kb8nnn samsung (3) ceramic capacitor, 100nf, 50v, x7r, size 0603 1 r1 crcw060312k1fkea vishay (4) resistor, 10k ? , 1%, 1/16w, size 0603 1 r2 crcw060312k1fkea vishay (4) resistor, 10k ? , 1%, 1/16w, size 0603 1 u1 mic5323ymt micrel, inc. (5) 300ma low noise ultra low dropout ldo 1 notes: 1. tdk: www.tdk.com 2. murata: www.murata.com 3. samsung: www.samsungsem.com 4. vishay: www.vishay.com 5. micrel, inc.: www.micrel.com
micrel, inc. mic5323 november 2011 13 m9999-110311b layout recommendations top layer bottom layer
micrel, inc. mic5323 november 2011 14 m9999-110311b package information 6-pin 2mm x 2mm thin mlf ? (mt) 5-pin tsot-23 (d5)
micrel, inc. mic5323 november 2011 15 m9999-110311b 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 the information furnished by micrel in this data sheet is belie ved to be accurate and reliable. however, no responsibility is a ssumed by micrel for its use. micrel reserves the right to change circuitry and specifications at any time without notification to the customer. 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. ? 2011 micrel, incorporated. 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. ? 2011 micrel , incor p orated.

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