mic5326 150ma low operating current ldo mlf and micro leadframe are registered trademarks of amkor technology, inc. micrel inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? tel +1 ( 408 ) 9440800 ? fax + 1 (408) 4741000 ? http://www.micrel.com october 2008 m9999-100808-a general description the mic5326 is a low quiescent current, low dropout regulator designed for optimal performance in a small space. the mic5326 is capable of sourcing 150ma of output current while only consuming 24a of operating current. this high performance ldo offers low dropout, fast transient response, good psrr, and low output voltage noise. the mic5326 is an ideal solution for battery operated applications due to low operating current of 24 a and extremely low dropout voltage of 85mv at 150ma. equipped with a ttl logic compatible enable pin, the mic5326 can be put into a zero-off-mode current state drawing virtually no current when disabled. board space and component co st is minimized because the mic5326 operates with very small 1 f ceramic capacitors, provides fixed output voltages, and is available in the tiny 1.2mm x 1.6mm thin mlf ? package. mic5326 also features thermal shutdown and current limit protection. data sheets and support documentation can be found on micrel?s web site at www.micrel.com. features ? 150ma output current ? input voltage range: 2.3v to 5.5v ? low 24a operating current ? low dropout voltage of 85mv @ 150ma ? fixed output voltage ? stable with 1 f ceramic capacitors ? thermal shutdown and current limit protection ? tiny 4-pin 1.2mm x 1.6mm thin mlf ? package applications ? mobile handsets ? gps and navigation devices ? portable media players ? digital still and video cameras ? pdas ? portable electronics ___________________________________________________________________________________________________________ typical application mic5326-xxymt vin ven vout gnd 1f 1f vbat vout ldo application
micrel, inc. mic5326 october 2008 2 m9999-100808-a ordering information part number marking (2) voltage (1) temperature range package (3) mic5326-2.8ymt 2q8 2.8v ?40 to + 125c 4-pin 1.2mm x 1.6mm thin mlf ? note: 1. for other voltage options contact micrel marketing. 2. pin 1 identifier= ? ?. 3. mlf is a green rohs compliant package. lead fi nish is nipdau. mold compound is halogen free. pin configuration 1 vin gnd 4 vout en 3 2 4-pin 1.2mm x 1.6mm thin mlf ? (mt) pin description pin number pin name pin function 1 vin supply input. 2 gnd ground. 3 en enable input: active high logic input. logic high = on; logic low = off. do not leave floating. 4 vout output voltage. hspad epad exposed heatsink pa d connected to ground internally.
micrel, inc. mic5326 october 2008 3 m9999-100808-a absolute maximum ratings (1) supply voltage (v in ) ........................................ ?0.3v to +6v enable voltage (v en )......................................... ?0.3v to v in power dissipation (p d ) ........................... internally limited (3) lead temperature ( sold ering, 5s ec.)........................ 260c junction temperature(t j ).........................?40c to +125c storage temperature (t s ) .........................?65c to +150c esd rati ng..................................................................... 2kv operating ratings (2) supply voltage (v in )......................................... 2.3v to 5.5v enable/select voltage (v en )................................... 0v to v in junction temperature (t j ) ........................ ?40c to +125c junction thermal resistance 1.2mm x 1.6mm thin mlf-4 ( ja )......................173c/w electrical characteristics (5) v in = v en = v out + 1v; c out = 1f; i out = 100a; t j = 25c, bold values indicate ?40c to +125c, unless noted. parameter condition min typ max units variation from nominal v out ?1.5 +1.5 % output voltage accuracy variation from nominal v out ?2.0 +2.0 % v in = v out +1v to 5.5v, i out = 100a 0.01 0.3 %/v line regulation v in = v out +1v to 5.5v, i out = 100a 0.5 %/v load regulation (6) i out = 100a to 150ma 0.05 1 % dropout voltage (7) i out = 50ma i out = 100ma i out = 150ma 30 55 85 150 mv mv mv ground pin current (8) i out = 100a to 150ma 24 35 a ground pin current in shutdown v en = 0v 0.01 1 a ripple rejection f = 1khz; c out = 1f; i out = 150ma f = 20khz; c out = 1f; i out = 150ma 60 50 db db current limit v out = 0v 275 475 750 ma output voltage noise c out = 1f, 10hz to 100khz 90 v rms enable voltage logic low 0.2 v enable voltage logic high 1.2 v v il 0.2v 0.01 1 a enable current v ih 1.2v 0.01 1 a turn on time c out = 1f; i out = 150ma 150 500 s notes: 1. exceeding the absolute maxi mum 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 temper ature, 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. regulation is measured at constant junction temperature using low duty cycle pulse testing. 7. dropout voltage is defined as the input to output different ial at which the output voltage drops 2% below its nominal v out 8. ground pin current is the regulator quiescent current. the to tal current drawn from the supply is the sum of the load curr ent plus the ground pin current.
micrel, inc. mic5326 october 2008 4 m9999-100808-a typical characteristics 10 0 power supply rejection ratio 100 frequency (hz) 10 1k 10k 1m v in = v out +1v v out = 2.8v c out = 1f 50ma 100ma 150ma 100k 100a 2.60 2.65 2.70 2.75 2.80 2.85 2.90 2.95 3.00 0 255075100125150 output current (ma) output voltage vs. output current v in = v en = v out +1 v out = 2.8v c in = c out = 1f 2.60 2.65 2.70 2.75 2.80 2.85 2.90 2.95 3.00 output voltage vs. temperature -40 -20 0 20 40 60 80 100 120 temperature (c) v in = v en = v out +1v c in = c out = 1f 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 vs. input voltage v en = 1.2v v out = 2.8v c in = c out = 1f 100a 50ma 150ma 16 20 24 28 32 0 255075100125150 output current (ma) ground current vs. output current v in = v en = v out + 1 v out = 2.8v c in = c out = 1f 0 10 20 30 40 50 60 70 80 90 100 0 25 50 75 100 125 150 output current (ma) dropout voltage vs. output current v en = v in c in = c out = 1f 0 20 40 60 80 100 120 dropout voltage vs. temperature -40 -20 0 20 40 60 80 100 120 temperature (c) v en = 1.2v v out = 2.8v c in = c out = 1f i load = 150ma 16 20 24 28 32 ground current vs. temperature -40 -20 0 20 40 60 80 100 120 temperature (c) v in = v en = v out + 1v v out = 2.8v c in = c out = 1f 100a 150ma 10 14 18 22 26 30 34 2.5 3 3.5 4 4.5 5 5.5 input voltage (v) ground current vs. input voltage 100a 150ma v in = v en v out = 2.8v c in = c out = 1f 400 450 500 550 600 650 700 2.5 3.0 3.5 4.0 4.5 5.0 5.5 input voltage (v) current limit vs. input voltage v en = 1.2v v out = 2.8v c in = c out = 1f 0.01 0.1 1 10 100 output noise spectral density frequency (hz) 100 1k 10k 1m 100k v in = 4.5v v out = 2.8v c out = 1f
micrel, inc. mic5326 october 2008 5 m9999-100808-a functional characteristics
micrel, inc. mic5326 october 2008 6 m9999-100808-a functional diagram vin en gnd vout ldo reference mic5326 block diagram
micrel, inc. mic5326 october 2008 7 m9999-100808-a applications information the mic5326 is a low quiescent current, low dropout regulator designed for optimal performance in a small space. the mic5326 regulator is fully protected from damage due to fault conditions, offering linear current limiting and thermal shutdown. input supply voltage v in provides the supply to power the ldo. the minimum input voltage is 2.3v allowing conversion from typical lithium ion batteries and low voltage supplies. input capacitor the mic5326 is a high performance, high bandwidth device; therefore it requires a well bypassed input supply for optimal performance. a 1f capacitor is required from the input to ground to provide stability. low esr ceramic capacitors provide optimal performance with minimum space required. additional high frequency capacitors, such as small value npo dielectric type capacitors, help filter out high frequency noise and are good practice in any rf circuit. output capacitor the mic5326 requires an output capacitor of 1f 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 1f ceramic output capacitor. x7r/x5r dielectric type ceramic capacitors are recommended because of their temperature performance. x7r type capacitors change capacitance by 15% over their operatin g temperature range. 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 equiva lent operating temperature range. minimum load current the mic5326 does not require a minimum load to maintain output voltage regulation. enable/ shutdown the mic5326 comes with an active high enable pin that enables the regulator. forcing the enable pin low disables the regulator and sends it into a ?zero? off mode current state. in this stat e, current consumed by the regulator goes nearly to zero. the active high enable pin uses cmos technology and cannot be left floating; a floating enable pin may cause an unknown output state. thermal considerations the mic5326 is designed to provide 150ma continuous output current from a very small footprint package. maximum ambient operating temperature can be calculated based on the output current and the voltage drop across the part. for exampl e: given that the input voltage is 3.6v, the output vo ltage is 2.8v and the output current is 150ma. the 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 = (3.6v ? 2.8v) 150ma p d = 0.12w to determine the maximum ambient operating temperature use the junction to ambient thermal resistance of the device and the following basic equation: ? ? ? ? ? ? ? ? ? = ja a j(max) d(max) t t p the maximum junction temperature of the die, t j(max) = 125c.the package thermal resistance, ja = 173c/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. the maximum power dissipation must not be exceeded for proper operation. for example, when operati ng the mic5326 at an input voltage of 3.6v and 150ma load with a minimum footprint layout, the maximum ambient operating temperature t a can be determined as follows: 0.12w = (125c ? t a )/(173c/w) t a = 104.24c therefore a 2.8v 150ma application can accept an ambient operating temperature of 104.24c in a 1.2mm x 1.6mm thin mlf ? 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. mic5326 october 2008 8 m9999-100808-a j3 vout vin 1 en 3 vout 4 gnd 2 u1 mic5326-xxymt j4 gnd c2 1f j1 vin j5 en c1 1f j2 gnd bill of materials item part number manufacturer description qty. c1, c2 c1608x5r0j105k tdk (1) capacitor, 1f, 10v, x5r, size 0603 2 u1 mic5326-xxymt micrel, inc. (2) 150ma low operating current ldo 1 notes: 1. tdk: www.tdk.com 2. micrel, inc.: www.micrel.com
micrel, inc. mic5326 october 2008 9 m9999-100808-a pcb layout recommendations top layer bottom layer
micrel, inc. mic5326 october 2008 10 m9999-100808-a package information 4-pin 1.2mm x 1.6mm thin mlf ? (mt) micrel, inc. 2180 fortune drive san jose, ca 95131 usa tel +1 (408) 9440800 fax +1 (408) 4741000 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. ? 2008 micrel, incorporated.
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