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mic5209 500ma low - noise ldo regulator intel is a registered trademark of intel corporation. micrel inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? tel +1 (408) 944 - 0800 ? fax + 1 (408) 474 - 1000 ? http://www.micrel.com may 1 9 , 2015 revision 4.1 general description the mic5209 is an ef?cient linear voltage regulator with very low dropout voltage, typically 10mv at light loads and less than 500mv at full load, with better than 1% output voltage accuracy designed especially for hand - held, battery - powered devices, the mic5209 features low ground current to help prolong battery life. an enable/shutdown pin on so - 8 and to - 263 - 5 versions can further improve battery life with near - zer o shutdown current. key features include reversed - battery protection, current limiting, overtemperature shutdown, ultra - low - noise capability (so - 8 and to - 263 - 5 versions), and availability in thermally - ef?cient packaging. the mic5209 is available in adjusta ble or ?xed output voltages. datasheets and support documentation are available on micrels web site at : www.micrel.com . features ? output voltage range: 1.8v ? 1 5v ? meets inte l ? slot 1 and slot 2 requirements ? guarantee d 500ma output over the full operating temperature range ? low 500mv maximum dropout voltage at full load ? extremely tight load and line regulation ? thermally - ef?cient surface - mount package ? low temperature coef?cient ? current and thermal limiting ? reversed - batte ry protection ? no - load stability ? 1% output accuracy ? ultra - low - noise capability in so - 8 and to - 263 -5 ? ultra - small 3mm 3mm dfn package applications ? pentium ii slot 1 and slot 2 support circuits ? laptop, notebook, and palmtop computers ? cellular telephones ? consumer and personal electronics ? smps post - regulator/dc - to - dc modules ? high - ef?ciency linear power supplies typical application 3.3v nominal input slot 1 power supply ultra - low noise 5v regulator downloaded from: http:///
micrel, inc. mic5209 may 1 9 , 2015 2 revision 4.1 ordering information part number voltage junction temperature range package pb- free mic5209 - 2.5ys 2.5v ? 40c to +125c sot - 223 x mic5209 - 3.0ys 3.0v ? 40c to +125c sot - 223 x mic5209 - 3.3ys 3.3v ? 40c to +125c sot - 223 x mic5209 - 3.6ys 3.6v ? 40c to +125c sot - 223 x mic5209 - 4.2ys 4.2v ? 40c to +125c sot - 223 x mic5209 - 5.0ys 5.0v ? 40c to +125c sot - 223 x mic5209 - 1.8ym ( 1 ) 1.8v 0c to +125c soic -8 x mic5209 - 2.5ym 2.5v ? 40c to +125c soic -8 x mic5209 - 3.0ym 3.0v ? 40c to +125c soic -8 x mic5209 - 3.3ym 3.3v ? 40c to +125c soic -8 x mic5209 - 3.6ym 3.6v ? 40c to +125c soic -8 x mic5209 - 5.0ym 5.0v ? 40c to +125c soic -8 x mic5209ym adjustable (2.5v ? 15.0v) ? 40c to +125c soic -8 x adjustable (1.8v ? 2.5v) 0c to +125c mic5209 - 1.8yu ( 1 ) 1.8v 0c to +125c to - 263 -5 x mic5209 - 2.5yu 2.5v ? 40c to +125c to - 263 -5 x mic5209 - 3.0yu 3.0v ? 40c to +125c to - 263 -5 x mic5209 - 3.3yu 3.3v ? 40c to +125c to - 263 -5 x mic5209 - 3.6yu 3.6v ? 40c to +125c to - 263 -5 x mic5209 - 5.0yu 5.0v ? 40c to +125c to - 263 -5 x mic5209yu adjustable (2.5v ? 15.0v) ? 40c to +125c to - 263 -5 x adjustable (1.8v ? 2.5v) 0c to +125c mic5209yml adjustable (2.5v ? 15.0v) ? 40c to +125c 8- pin dfn x adjustable (1.8v ? 2.5v) 0c to +125c note: 1. contact micrel for availability. downloaded from: http:///
micrel, inc. mic5209 may 1 9 , 2015 3 revision 4.1 pin configuration mic5209 - x.x ys sot - 223 fixed voltages mic5209yml 8- pin 3mm 3mm dfn adjustable voltages mic5209 - x.x ym so-8 fixed voltages mic5209 - x.x yu to - 263 -5 fixed voltages mic5209 ym so-8 adjustable voltages mic5209 yu to - 263 -5 adjustable voltages downloaded from: http:///
micrel, inc. mic5209 may 1 9 , 2015 4 revision 4.1 pin description pin number 8-pin dfn pin number sot - 223 pin number so-8 pin number to - 263 -5 pin name pin function 1, 2 1 2 2 in supply input. 7 2 , tab 5 ? 8 3 , tab gnd ground: sot - 223 pin 2 and tab are internally connected. so - 8 pins 5 through 8 are internally connected. 3, 4 3 3 4 out regulator output: pins 3 and 4 must be tied together. 5 nc not connected. 8 1 1 en enable (input): cmos - compatibl e control input. logic high = enable; logic low = s hutdown. 4 (fixed) 5 (fixed) byp reference bypass: connect external 470pf capacitor to gnd to reduce output noise. can be left open. for 1.8v or 2.5v operation, see application information . 6 4 (adjustable) 5 (adjustable) adj adjust (input): feedback input. connect to resistive voltage - divider network. ep epad exposed thermal pad: connect to gnd for best thermal performance. downloaded from: http:///
micrel, inc. mic5209 may 1 9 , 2015 5 revision 4.1 absolute maximum ratings ( 2 ) supply voltage (v in ) ....................................... ? 20v to + 20 v power dissipation (p d ). .......................... internally limited ( 4 ) ju nction temperature (t j ) all except 1.8v ................................... ? 40 c to +125 c 1.8v only ................................................ 0 c to +125 c lead temperature (soldering, 5 s) .............................. 260c storage temperature (t s ) ......................... ? 65c to +150 c esd rating sot - 223 ........................................ 2kv hbm/300v mm dfn, soic -8 ................................ . 5kv hbm/100v mm operating ratings ( 3 ) supply voltage (v in ) ...................................... + 2.5v to +16 v adjustable output voltage (v out ) range ..... +1.8v to 1 5.0v junction temperature (t j ) 2.5v ? 1 5.0v ....................................... C 40c to + 12 5c 1.8v v out < 2.5v .................................. 0 c to +125 c package thermal resistance .................................... note 4 electrical characteristics v in = v out + 1v, c out = 4.7 f, i out = 100 a; t j = 25c, bold values indicate C 40c t j +12 5c, except 0 c t j +125 c for 1.8v v out < 2.5v , unless noted. symbol parameter condition min . typ . max . units v out output voltage accuracy variation from nominal v out ? 1 1 % ? 2 2 ? v out / ? t output voltage temperature co - efficient note 5 40 ppm/ c ? v out / v out line regulation v in = v out + 1v to 16v 0.009 0.05 %/v 0.1 load regulation i out = 100 a to 500ma (6) 0.05 0.5 % 0.7 v in ? v out dropout voltage ( 7 ) i out = 100 a 10 60 mv 80 i out = 50 ma 115 175 250 i out = 150 ma 165 300 400 i out = 500 ma 350 500 600 notes: 2. exceeding the absolute maximum ratings may damage the device. 3. the device is not guaranteed to function outside its operating ratings. 4. the maximum allowable power dissipation at any t a (ambient temperature) is calculated using: p d (max) = (t j (max) C t a ) ja . exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator wil l go into thermal shutdown. see table 1 and the thermal considerations sub - section in application information for details. 5. output voltage temperature coef?cient is the worst case voltage change divided by t he total temperature range . 6. regulation is measured at constant junction temperature using low duty cycle pulse testing. parts are tested for load regulation in the load range from 100a to 500ma. changes in output voltage due to heating effects are covered by the ther mal regulation speci?cation . 7. dropout voltage is de?ned as the input to output diffe rential at which the output voltage drops 2% below its nominal value measured at 1v differential. 8. ground pin current is the regulator quiescent current plus pass transistor base current. the total c urrent drawn from the sup ply is the sum of the load curren t plus the ground pin current. 9. v en is the voltage externally applied to devices with the en (enable) input pin. [so - 8 (m) and to - 263 -5 (u) packages only.] downloaded from: http:///
micrel, inc. mic5209 may 1 9 , 2015 6 revision 4.1 electrical characteristics (continued) v in = v out + 1v, c out = 4.7 f, i out = 100 a; t j = 25c, bold values indicate C 40c t j +12 5c, except 0 c t j +125 c for 1.8v v out < 2.5v, unless noted. symbol parameter condition min . typ . max . units i gnd ground pin current ( 8 , 9 ) v en 3.0v, i out = 100 a 80 130 a 170 v en 3.0v, i out = 50 ma 350 650 900 v en 3.0v, i out = 150 ma 1.8 2.5 ma 3.0 v en 3.0v, i out = 500 ma 8 20 25 i gnd ground pin quiescent current ( 9 ) v en 0.4v (shutdown) 0.05 3 a v en 0.18v (shutdown) 0.10 8 psrr ripple rejection f = 120hz 75 db i limit current limit v out = 0v 700 900 ma 1000 ? v out / ? p d thermal regulation note 10 0.05 %/w e no output noise ( 11 ) v out = 2.5v, i out = 50ma c out = 2.2 f, c byp = 0 500 nv hz i out = 50ma, c out = 2.2 f c byp = 470pf 300 v enl enable input logic - low voltage v en = logic low (regulator shutdown) 0.4 v 0.18 v en = logic high (regulator enabled) 2.0 i enl enable input current v enl 0.4v 0.01 ? 1 a v enl 0.18v 0.01 ? 2 i enh v enh 2.0v 5 20 a 25 v enh 16v 30 50 notes: 10. thermal regulation is the change in output voltage at a time t after a change in power dissipation is applied, excluding load or line regulation effects. speci?cations are for a 500ma load pulse at v in = 16v for t = 10ms. 11. c byp is an optional, external by pass capacitor connected to devices with a byp (bypass) or adj (adjust) pin. [so - 8 (m) and to - 263 -5 (u) packages only]. downloaded from: http:///
micrel, inc. mic5209 may 1 9 , 2015 7 revision 4.1 block diagrams low - noise fixed regulator (sot - 223 version only) ultra - low - noise fixed regulator ultra - low - noise adjustable regulator downloaded from: http:///
micrel, inc. mic5209 may 1 9 , 2015 8 revision 4.1 typical characteristics downloaded from: http:///
micrel, inc. mic5209 may 1 9 , 2015 9 revision 4.1 typical characteristics (continued) downloaded from: http:///
micrel, inc. mic5209 may 1 9 , 2015 10 revision 4.1 application information enable shutdown enable is not available on devices in the sot - 223 (s) package . forcing en (enable/shutdown) high (> 2v) enables the regula tor. en is compatible with cmos logic. if the enable/shutdown feature is not required, connect en to in (supply input). input capacito r a 1f capacitor should be placed from in to gnd if there is more than 10 inches of wire between the input and the ac ?lter capacitor or if a battery is used as the input. output capacitor an output capacitor is required between out and gnd to prevent oscillation. the minimum size of the output capacitor is dependent upon whether a reference bypass capacitor is used. 1f minimum is recommended when cbyp is not used (see figure 1 ). 2.2f minimum is recommended when cbyp is 470pf (see figure 2 ). larger values improve the regulators transient response. the output capacitor should have an esr (equivalent series resistance) of about 1 and a resonant frequency above 1mhz. ultra - low - esr and ceramic capacitors can cause a low amplitude oscillation on the output and/or underdamped transient re sponse. most tantalum or aluminum electrolytic capacitors are adequate; ?lm types will work, but are more expensive. since many aluminum electrolytics have electrolytes that freeze at about C 30c, solid tantalums are recommended for operation below ? 25c. at lower values of output current, less output capacitance is needed for output stability. the capacitor can be reduced to 0.47f for current below 10ma or 0.33f for currents below 1ma. no - load stability the mic5209 will remain stable and in regulation with no load (other than the internal voltage divider) unlike many other voltage regulators. this is especially important in cmos ram keep - alive applications. reference bypass capacitor byp (reference bypass) is available only on devices in so - 8 and to - 263 - 5 packages. byp is connected to the internal voltage reference. a 470pf capacitor (c byp ) connected from byp to gnd quiets this reference, providing a signi?cant reduction in output noise (ultra - low - noise performance). because c byp reduces the phase margin, the output capacitor should be increased to at least 2.2f to maintain stability. the start - up speed of the mic5209 is inversely proportional to the size of the reference bypass capacitor. applications requiring a slow ramp - up of output voltage should consider larger values of c byp . likewise, if rapid turn - on is necessary, consider omitting c byp . if output noise is not critical, omit c byp and leave byp open. thermal considerations the sot - 223 has a ground tab which allows it to dissipate more power than the so - 8 (r efe r to the slot - 1 power supply sub - section for details ) . at 25c ambient, it will operate reliably at 2w dissipation with worst - case mounting (no ground plane, minimum trace widths, and fr4 printed circuit board). thermal resistance values for the so - 8 represent typical mounting on a 1 - square, copper - clad, fr4 circuit board. for greater power dissipation, so - 8 versions of the mic5209 feature a fused internal lead frame and die bonding arrange ment that reduces thermal resistance when compared to standard so - 8 packages. table 1 . mic5209 thermal resistance package ja jc sot - 223 (s) 50 c/w 8 c/w so- 8 (m) 50 c/w 20 c/w to - 263 - 5 (u) ? 2 c/w 3mm 3mm dfn (ml) 63 c/w 2 c/w multilayer boards with a ground plane, wide traces near the pads, and large supply - bus lines will have better thermal con ductivity and will also allow additional power dissipation. for additional heat sink characteristics, refer to micrel application hint 17, designing p.c. board heat sinks , included in micrels databook. for a full discussion of heat sinking and thermal effects on voltage regulators, refer to the regulator thermals section of micrels designing with low - dropout voltage regulators handbook. low - voltage operation the mic5209 - 1.8 and mic5209 - 2.5 re quire special con sideration when used in voltage - sensitive systems. they may momentarily overshoot their nominal output voltages unless appropriate output and bypass capacitor values are chosen. during regulator power up, the pass transistor is fully satu r ated for a short time, while the error ampli?er and voltage reference are being powered up more slowly from the output (see block diagrams ). downloaded from: http:///
micrel, inc. mic5209 may 1 9 , 2015 11 revision 4.1 select ing larger output and bypass capacitors allows additional time for the error ampli?er and reference to turn on and prevent overshoot. to ensure that no overshoot is present when starting up into a light load (100a), use a 4.7f output capacitance and 470pf bypass capacitance. this slows the turn - on enough to allow the regulator to react and keep the output voltage from exceeding its nominal value. at heavier loads, use a 10f output capacitance and 470pf bypass capacitance. lower values of output and bypas s capacitance can be used, depending on the sensitivity of the system. applications that can withstand some overshoot on the output of the regulator can reduce the output capacitor and/or reduce or eliminate the bypass capacitor. applications that are not sensitive to overshoot due to power - on reset delays can use normal output and bypass capacitor con?gurations. please note the junction temperature range of the regulator with an output less than 2.5v (?xed and adjustable) is 0 c to +125 c. fixed regulator circuits figure 1 shows a basic mic5209 - x.x y m (so - 8) ?xed - voltage regulator circuit. see figure 5 for a similar con?guration using the more thermally - ef?cie nt mic5209 - x.x y s (sot - 223). a 1f minimum output capacitor is required for basic ?xed - voltage applications. figure 1 . low - noise fixed voltage regulator figure 2 includes the optional 470pf noise bypass capacitor between byp and gnd to reduce output noise. note that the minimum value of c out must be increased when the bypass capacitor is used. figure 2 . ultra - low - noise fixed voltage regulator adjustable regulator circuits the mic5209 y m, mic5209yu, and mic5209yml can be adjusted to a speci?c output volt age by using two external resistors ( figure 3 ). the resistors set the output voltage based on the equation: ?? ? ?? ? + = 1r 2r 1 v 242 .1 v out eq. 1 this equation is correct due to the con?guration of the bandgap reference. the bandgap voltage is relative to the output, as seen in the block diagram. traditional regula tors normally have the reference voltage relative to ground; therefore, their equations are different from the equation for the mic5209 y. although adj is a high - impedan ce input and, for best performance, r2 should not exceed 470k. figure 3 . low - noise adjustable voltage regulator figure 4 includes the optional 470pf bypass capacitor from adj to gnd to reduce output noise. figure 4 . ultra - low - noise adjustable application downloaded from: http:///
micrel, inc. mic5209 may 1 9 , 2015 12 revision 4.1 slot - 1 power supply intel s pentium ii processors have a requirement for a 2.5v 5% power supply for a clock synthesizer and its associated loads. the current requirement for the 2.5v supply is dependent upon the clock synthesizer used, the number of clock outputs, and the type of level shifter (from core logic levels to 2.5v levels). intel estimates a worst - case load of 320ma. the mic5209 was designed to provide the 2.5v power requirement for slot - 1 applications. its guaranteed performance of 2.5v 3% at 500ma allows adequate mar gin for all systems, and the dropout voltage of 500mv means that it operates from a worst - case 3.3v supply where the voltage can be as low as 3.0v. figure 5 . slot - 1 power supply a slot - 1 power supply ( figure 5 ) is easy to implement. only two capacitors are necessary, and their values are not critical. c in bypasses the internal circuitry and should be at least 0.1 f. cout provides output filtering, improves transient response, and compensates the internal regulator control loop. its value should be at least 22 f. c in and c out can be increased as much as desired. slot - 1 power supply power dissipation powered from a 3.3v supply, the slot - 1 power supply illustrated in figure 5 has a nominal efficiency of 75%. at the maximum anticipated slot - 1 load (320ma), the nominal power dissipation is only 256mw. the sot - 223 package has suf?cient thermal characteristics for wide design margins when mounted on a singl e- layer copper - clad printed circuit board. the power dissipation of the mic5209 is calculated using the voltage drop across the device output current plus supply voltage ground current. considering worst - case tolerances, the power dissipation could be as high as: (v in(max) ? v out(max) ) i out + v in(max) i gnd [(3.6v ? 2.375v) 320ma] + (3.6v 4ma) p d = 407mw using the maximum junction temperature of 125c and a jc of 8c/w for the sot - 223, 25c/w for the so - 8, or 2c/w for the to - 263 package, the following worst - case heat - sink thermal resistance ( sa ) requirements are: jc ja sa d a ) max (j ja p t t = = ? = table 2 and figure 6 show that the slot - 1 power supply application can be implemented with a m inimum footprint layout. table 2 . maximum allowable thermal resistance t a 40 c 50 c 60 c 75 c ja (limit) 209 c/w 184 c/w 160 c/w 123 c/w sa sot - 223 201 c/w 176 c/w 152 c/w 115 c/w sa so -8 184 c/w 159 c/w 135 c/w 98 c/w sa to - 263 -5 207 c/w 182 c/w 158 c/w 121 c/w figure 6 shows the necessary copper pad area to obtain specific heatsink thermal resistance ( sa ) values. the sa values highlighted in table 2 require much less than 500mm2 of copper and, per figure 6 , can be easily accomplished with the minimum footprint. figure 6 . pcb heatsink thermal resistance downloaded from: http:///
micrel, inc. mic5209 may 1 9 , 2015 13 revision 4.1 package information and recommended land patterns ( 12 ) sot - 223 (s) note: 12. package information is correct as of the publication date. for updates and most current information, go to www.micrel.com . downloaded from: http:///
micrel, inc. mic5209 may 1 9 , 2015 14 revision 4.1 package information and recommended land patterns ( 12 ) (continued) 8- pin soic (m) downloaded from: http:///
micrel, inc. mic5209 may 1 9 , 2015 15 revision 4.1 package information and recommended land patterns ( 12 ) (continued) to - 263 - 5 (u) downloaded from: http:///
micrel, inc. mic5209 may 1 9 , 2015 16 revision 4.1 package information and recommended land patterns ( 12 ) (continued) 8- pin 3mm 3mm dfn (ml) downloaded from: http:///
micrel, inc. mic5209 may 1 9 , 2015 17 revision 4.1 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, inc. is a leading global manufacturer of ic solutions for the worldwide high - performance linear and power, lan, and timing & communications markets. the companys products include advanced mixed - signal, analog & power semiconductors; high - performance communication, clock management, mems - based clock oscillators & crystal - less clock generators, ethernet switches, and physical layer transceiver ics. company customers include leading manufact urers of enterprise, consumer, industrial, mobile, telecommunications, automo tive, and computer products. corporation headquarters and state - of - the - art wafer fabrication facilities are located in san jose, ca, with regional sales and support offices and advanced technology design centers situated throughout the americas, europe, and asia. additionally, the company maintains an extensive network of distributors and reps worldwide. micrel makes no representations or warranties with respect to the accuracy or completeness of the inf ormation furnished in this data sheet. this information is not intended as a warranty and micrel does not assume responsibility for its use. micrel reserves the right to change circuitry, specifications and descriptions at any ti me without notice. no license, whether express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted by this document. except as provided in micrels terms and conditions of sale for such products , micrel assumes no li ability whatsoever, and micrel disclaims any express or implied warranty relating to the sale and/or use of mi crel products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copy right , or other intellectual property right. micrel products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. life support devices or systems are devices or sy stems that (a) are intended 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 purchasers u se or sale of micrel products for use in life support appliances, devices or systems is a purchasers own risk and purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 20 14 micrel, incorporated. downloaded from: http:///

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