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mic5357 high performance, low noise dual 500ma uldo? uldo 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 mic5357 is a tiny dual ultra low dropout (uldo?) linear regulator ideally suited for portable electronics due to its low output noise. the mic5357 provides two independently controlled high performance 500ma ldos with typical dropout voltage of 130mv at rated load. in addition, the mic5357 provides a bypass pin to reduce the output noise. the mic5357 is designed to be stable with small ceramic output capacitors thereby reducing required board space and component cost. the combination of extremely low dropout voltage, low output noise and exceptional thermal package characteristics makes it ideal for powering rf and noise sensitive circuitry, cellular phone camera modules, imaging sensors for digital still cameras, pdas, mp3 players and webcam applications. the mic5357 uldo? is available in fixed output voltages in the small 8-pin epad msop package. additional voltage options are available. for more information, contact micrel marketing. data sheets and support documentation can be found on micrel?s web site at: www.micrel.com . features ? 2.6v to 5.5v input voltage range ? ultra low dropout voltage: 130mv @ 500ma ? ultra low output noise: 51v rms ? 2% initial output accuracy ? small 8-pin epad msop package ? excellent load/line transient response ? fast start up time: 38s ? cap stable with 2.2f ceramic capacitors ? thermal shutdown protection ? low quiescent current: 160a with both outputs at maximum load ? current-limit protection applications ? battery-powered applications ? pdas ? gps receivers ? portable electronics ? portable media players ? digital still and video cameras _________________________________________________________________________________________________________________________ typical application january 2011 m9999-011311 rf power supply circuit
micrel, inc. mic5357 january 2011 2 m9999-011311 block diagram
micrel, inc. mic5357 january 2011 3 m9999-011311 ordering information voltage(v) part number (1) manufacturing part number marking v out1 v out2 junction temperature range package mic5357-3.3/2.8ymme mic5357-sm ymme 57sm 3.3v 2.8v ?40c to +125c 8-pin epad msop mic5357-3.3/1.8ymme mic5357-sg ymme 57sg 3.3v 1.8v ?40c to +125c 8-pin epad msop mic5357-2.8/1.8ymme mic5357-mg ymme 57mg 2.8v 1.8v ?40c to +125c 8-pin epad msop mic5357-1.8/1.5ymme mic5357-gf ymme 57gf 1.8v 1.5v ?40c to +125c 8-pin epad msop notes 1. for other voltage options contact micrel marketing. pin configuration 8-pin epad msop (mme) top view pin description pin number pin name pin function 1 vin supply input. 2 gnd ground. 3 byp reference bypass: connect external 0. 1f to gnd to reduce output noise. may be left open when bypass capacitor is not required. 4 en2 enable input (regulator 2). active hi gh input. logic high = on; logic low = off; do not leave floating. 5 en1 enable input (regulator 1). active hi gh input. logic high = on; logic low = off; do not leave floating. 6 nc not internally connected. 7 vout2 regulator output ? ldo2. 8 vout1 regulator output ? ldo1. epad hs pad heatsink pad internally connected to ground.
micrel, inc. mic5357 january 2011 4 m9999-011311 absolute maximum ratings (1) supply voltage (v in ) ........................................ ? 0.3v to + 6v enable input voltage (v en1 , v en2 )..................... ? 0.3v to v in power dissipation ..................................in ternally limited (3) lead temperature (solde ring, 3sec ) .......................... 260c storage temperature (t s )......................... ? 65c to + 150c esd rating (4) ................................................................. 2kv operating ratings (2) supply voltage (v in )..................................... +2.6v to +5.5v enable input voltage (v en1 , v en2 ) .......................... 0v to v in junction temperature ............................... ?40c to +125c junction thermal resistance 8-pin epad msop ( ja ) .................................64.4c/w electrical characteristics (5) v in = v en1 = v en2 = v out + 1.0v; higher of the two regulator outputs, i outldo1 = i outldo2 = 100a; c out1 = c out2 = 2.2f; c byp = 0.1f; t j = 25c, bold values indicate ?40c t j +125c, unless noted. parameter conditions min. typ. max. units variation from nominal v out -2.0 +2.0 output voltage accuracy variation from nominal v out ; ?40c to +125c -3.0 +3.0 % line regulation v in = v out + 1v to 5.5v; i out = 100a 0.05 0.3 0.6 %/v load regulation i out1&2 =100a to 500ma 0.7 2.5 % dropout voltage (6) i out1,2 = 100a i out1,2 = 50ma i out1,2 = 500ma 0.1 12 130 50 300 mv ground current v en1 1.2v; v en2 0.2v; i out = 0ma to 500ma v en1 0.2v; v en2 1.2v; i out2 = 0ma to 500ma v en1 = v en2 1.2v; i out1 = 500ma, i out2 = 500ma 95 95 160 175 175 240 a ground current in shutdown v en1 = v en2 = 0v 0.01 2 a ripple rejection f = 1khz; c out = 2.2f; c byp = 0.1f f = 20khz; c out = 2.2f; c byp = 0.1f 70 45 db v out1 = 0v 550 950 1300 current limit v out2 = 0v 550 950 1300 ma output voltage noise c out = 2.2f; c byp = 0.1f; 10hz to 100khz 51 v rms enable inputs (en1 / en2) logic low 0.2 enable input voltage logic high 1.2 v v il 0.2v 0.01 enable input current v ih 1.2v 0.01 a turn-on time (see timing diagram) turn-on time (ldo1 and 2) c out = 2.2f; c byp = 0.1f 38 100 s 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 te mperature, and the regulator will go into thermal shutdown. 4. devices are esd sensitive. handling precautions recommended. human body model 1.5k ? in series with 100pf. 5. specification for packaged product only. 6. dropout voltage is defined as the input-to-output different ial at which the output voltage drops 2% below its nominal v out . for outputs below 2.6v, the dropout voltage is the input-to-output differential with the minimum input voltage 2.6v.
micrel, inc. mic5357 january 2011 5 m9999-011311 typical characteristics ground current vs. output current (v out1 ) 80 85 90 95 100 0 50 100 150 200 250 300 350 400 450 500 output current (ma) ground current ( a) v in =4.3v v out1 =3.3v c in =c out =2.2 f ground current vs. output current (v out2 ) 80 85 90 95 100 0 50 100 150 200 250 300 350 400 450 500 output current (ma) ground current ( a) v in =4.3v v out2 =2.8v c in =c out =2.2 f ground current vs. temperature(dual outputs) 70 80 90 100 110 120 130 140 150 160 170 180 -40 -20 0 20 40 60 80 100 120 temperature (c) ground current ( a) i out1 =500ma i out1 =500ma , i out2 =500ma output voltage vs. input voltage 2.5 2.6 2.7 2.8 2.9 3 3.1 3.2 3.3 3.4 3.5 3.6 2.533.544.555.5 input voltage (v) output voltage (v) 100 a 500ma v out1 =3.3v c in =c out =2.2 f output voltage vs. input voltage 2.5 2.6 2.7 2.8 2.9 3 2.5 3 3.5 4 4.5 5 5.5 input voltage (v) output voltage (v) 100 a 500ma v out2 =2.8v c in =c out =2.2 f output voltage vs. output current 2.5 2.6 2.7 2.8 2.9 3 3.1 3.2 3.3 3.4 3.5 3.6 0 100 200 300 400 500 output current (ma) output voltage (v) v in =4.3v c in =c out =2.2 f v out1 v out2 dropout voltage vs. temperature 0 15 30 45 60 75 90 105 120 135 150 -40 -20 0 20 40 60 80 100 120 temperature (c) dropout voltage (mv) 150ma 300ma 500ma c in =c out =2.2 f 50ma dropout voltage vs. output current 0 15 30 45 60 75 90 105 120 0 100 200 300 400 500 output current (ma) dropout voltage (mv) v out1 =3.3v c in =c out =2.2 f ` current limit vs. input voltage 800 850 900 950 1000 1050 1100 1150 1200 2.5 3 3.5 4 4.5 5 5.5 input voltage (v) current limit (ma) v out1 =3.3v v out2 =2.8v c in =c out =2.2 f power supply rejection ratio -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 100 1000 10000 100000 frequency(hz) db v en1 =v in =4.74v v out1 =3.3v c out1 =2.2f c byp =0.1a 500ma 100a 300ma 150ma output noise spectral density 0.001 0.01 0.1 1 10 10 100 1000 10000 100000 1000000 frequency (hz) noise (uv/ hz) v in =4.7v v out2 =1.8v c in -c out =2.2 f/6.3v il=250ma noise output (10hz to 100khz)=51.16 vrms
micrel, inc. mic5357 january 2011 6 m9999-011311 functional characteristics
micrel, inc. mic5357 january 2011 7 m9999-011311 applications information enable/shutdown the mic5357 is provided with dual active high enable pins that allow each regulator to be enabled independently. forcing both enable pins low disables the regulators and sends it into a ?zero? off-mode-current state. in this 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 floating; a floating enable pin may cause an indeterminate state on the output. input capacitor the mic5357 is a high performance, high bandwidth device. therefore, it requ ires a well bypassed input supply for optimal performance. a 2.2f capacitor 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. output capacitor the mic5357 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 ceramic output capacitor and does not improve significantly with larger capacitance. x7r/x5r dielectric type ceramic capacitors are recommended because of their superior 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 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. bypass capacitor a capacitor can be placed from the noise bypass pin to ground to reduce output voltage noise. the capacitor bypasses the internal reference. 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 mic5357 to drive a large capacitor on the bypass pin without significantly slowing the turn on time. no-load stability unlike many other voltage regulators, the mic5357 will remain stable with no load. this is especially important in cmos ram keep alive applications. thermal considerations the mic5357 is designed to provide 500ma of continuous current for v out1 and 500ma for v out2 in a small package. the 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 3.6v, t he output voltage is 3.3v for v out1 , 2.8v for v out2 and the output current of 500ma and 500ma respectively. the actual power dissipation of the regulator circuit can be determined using the equation: p d = (v in ? v out1 ) i out1 + (v in ? v out2 ) i out2 + 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 = (3.6v ? 3.3v) 500ma + (3.6v -2.8) 500ma p d = 0.55w 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: p d(max) = t j(max) - t a ja ? ? t j(max) = 125c, the maximum junction temperature of the die ja thermal resistance = 64.4c/w.
micrel, inc. mic5357 january 2011 8 m9999-011311 thermal resistance 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 64.4c/w. the maximum power dissipation must not be exceeded for proper operation. for example, when operating the mic5357 at an input voltage of 3.6v and 500ma on v out1 and 500ma on v out2 , the maximum ambient operating temperature t a can be determined as follows: 0.55w = (125c ? t a )/(64.4c/w) t a = 89.6c therefore, a 3.3v/2.8v application with 500ma and 500ma output currents can accept an ambient operating temperature of 89.6c in a small 8 pin epad msop package. 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
micrel, inc. mic5357 january 2011 9 m9999-011311 typical application schematic bill of materials item part number manufacturer description qty. c1, c2,c3 c1005x5r0j225m tdk (1) capacitor, 2.2f ceramic, 6.3v, x5r, size 0402 3 c4 vj0402y104kxx vishay (2) capacitor, 0.1f ceramic, 25v, x7r, size 0402 1 u1 mic5357-xxymme micrel, inc. (3) high performance, low noise dual 500ma uldo? 1 notes: 1. tdk: www.tdk.com . 2. vishay tel: www.vishay.com . 3. micrel, inc.: www.micrel.com .
micrel, inc. mic5357 january 2011 10 m9999-011311 pcb layout recommendations top layer bottom layer
micrel, inc. mic5357 january 2011 11 m9999-011311 package information 8-pin epad msop (mme) 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 this data sheet. this information is not intended as a warranty and micrel does not assume responsibility for it s use. micrel rese rves the right to change circuitry, specifications and descriptions at any time without notice. no license, whether express, 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 any patent, copyright or other intellectual p roperty right. micrel products are not designed or authorized for use as com ponents in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. life suppo rt devices or systems 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 significant injury to the user. a purchaser?s use or sale of micrel products for use in life su pport appliances, devices or systems is a purchaser?s own risk a nd purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 2011 micrel, incorporated.

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