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feb ruary 2006 1 m9999-022106 mic5209 micrel, inc. typical applications 1 3 2 0.1 f 22 f tantalum v out 2.5v 1% v in 3.0v mic5209-2.5bs 3.3v nominal-input slot-1 power supply 1 2 3 4 8 7 6 5 mic5209-5.0bm 2.2 f tantalum v out 5v 470pf (optional) v in 6v enable shutdown ultra-low-noise 5v regulator mic5209 500ma low-noise ldo regulator 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-zero 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 adjustable or ?xed output voltages. for space-critical applications where peak currents do not exceed 500ma, see the mic5219. features ? meets intel ? slot 1 and slot 2 requirements ? guaranteed 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-battery protection ? no-load stability ? 1% output accuracy ? ultra-low-noise capability in so-8 and to-263-5 ? ultra-small 3mm x 3mm mlf? 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 micrel, inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? tel + 1 (408) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micrel.com
mic5209 micrel, inc. m9999- 0 22106 2 february 2006 ordering information part number voltage junction temp. range package pb-free mic5209-2.5bs 2.5v - 40 c to +125 c sot-223 mic5209-2.5ys 2.5v - 40 c to +125 c sot-223 x mic5209-3.0bs 3.0v - 40 c to +125 c sot-223 mic5209-3.0ys 3.0v - 40 c to +125 c sot-223 x mic5209-3.3bs 3.3v - 40 c to +125 c sot-223 mic5209-3.3ys 3.3v - 40 c to +125 c sot-223 x mic5209-3.6bs 3.6v - 40 c to +125 c sot-223 mic5209-3.6ys 3.6v - 40 c to +125 c sot-223 x mic5209-4.2bs 4.2v - 40 c to +125 c sot-223 mic5209-4.2ys 4.2v - 40 c to +125 c sot-223 x mic5209-5.0bs 5.0v - 40 c to +125 c sot-223 mic5209-5.0ys 5.0v - 40 c to +125 c sot-223 x mic5209-1.8bm* 1.8v - 0 c to +125 c soic-8 mic5209-1.8ym* 1.8v - 0 c to +125 c soic-8 x mic5209-2.5bm 2.5v - 40 c to +125 c soic-8 mic5209-2.5ym 2.5v - 40 c to +125 c soic-8 x mic5209-3.0bm 3.0v - 40 c to +125 c soic-8 mic5209-3.0ym 3.0v - 40 c to +125 c soic-8 x mic5209-3.3bm 3.3v - 40 c to +125 c soic-8 mic5209-3.3ym 3.3v - 40 c to +125 c soic-8 x mic5209-3.6bm 3.6v - 40 c to +125 c soic-8 mic5209-3.6ym 3.6v - 40 c to +125 c soic-8 x mic5209-5.0bm 5.0v - 40 c to +125 c soic-8 mic5209-5.0ym 5.0v - 40 c to +125 c soic-8 x mic5209bm adj. - 40 c to +125 c soic-8 mic5209ym adj. - 40 c to +125 c soic-8 x mic5209-1.8yu* 1.8v - 0 c to +125 c to-263-5 x mic5209-2.5bu 2.5v - 40 c to +125 c to-263-5 mic5209-2.5yu 2.5v - 40 c to +125 c to-263-5 x mic5209-3.0bu 3.0v - 40 c to +125 c to-263-5 mic5209-3.0yu 3.0v - 40 c to +125 c to-263-5 x mic5209-3.3bu 3.3v - 40 c to +125 c to-263-5 mic5209-3.3yu 3.3v - 40 c to +125 c to-263-5 x mic5209-3.6bu 3.6v - 40 c to +125 c to-263-5 mic5209-3.6yu 3.6v - 40 c to +125 c to-263-5 x mic5209-5.0bu 5.0v - 40 c to +125 c to-263-5 mic5209-5.0yu 5.0v - 40 c to +125 c to-263-5 x mic5209bu adj. - 40 c to +125 c to-263-5 mic5209yu adj. - 40 c to +125 c to-263-5 x mic5209yml adj. - 40 c to +125 c 8-pin mlf? x * contact marketing for availability.
feb ruary 2006 3 m9999-022106 mic5209 micrel, inc. 1 2 3 4 8 7 6 5 gnd gnd gnd gnd en in out byp mic5209-x.xbm so-8 fixed voltages 1 2 3 4 8 7 6 5 gnd gnd gnd gnd en in out adj mic5209bm so-8 adjustable voltage pin description pin no. 8-pin mlf pin no. sot-223 pin no. so-8 pin no. to-263-5 pin name pin function 1, 2 1 2 2 in supply input. 7 2, tab 5C8 3 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. 8 1 1 en enable (input): cmos compatible control input. logic high = enable; logic low = shutdown. 4 (?xed) 5 (?xed) byp reference bypass: connect external 470pf capacitor to gnd to reduce output noise. may be left open. for 1.8v or 2.5v operation, see applications information. 6 4 (adj.) 5 (adj.) adj adjust (input): feedback input. connect to resistive voltage-divider network. 5 byp 4 out 3 gnd 2 in 1 en d n g b a t mic5209-x.xbu to-263-5 fixed voltages 5 adj 4 out 3 gnd 2 in 1 en d n g b a t mic5209bu to-263-5 adjustable voltage pin con?guration i n out gnd 1 3 2 tab gnd mic5209-x.xbs sot-223 fixed voltages 1 vin vin vout vout 8 en gnd adj nc 7 6 5 2 3 4 5209 yww y part identification mic5209yml 8-pin 3x3 mlf adjustable voltage s
mic5209 micrel, inc. m9999- 0 22106 4 february 2006 electrical characteristics (note 11) v in = v out + 1.0v; c out = 4.7f, i out = 100a; t j = 25c, bold values indicate C40c t j +125c except 0c t j +125c for 1.8v version; unless noted. symbol parameter conditions min typical max units v out output voltage accuracy variation from nominal v out C1 1 % C2 2 % v out /t output voltage note 4 40 p pm/c temperature coef?cient v out /v out line regulation v in = v out + 1v to 16v 0.009 0.05 %/v 0.1 %/v v out /v out load regulation i out = 100a to 500ma (5) 0.05 0.5 % 0.7 % v in C v out dropout voltage (6) i out = 100a 10 60 mv 80 mv i out = 50ma 115 175 mv 250 mv i out = 150ma 165 300 mv 400 mv i out = 500ma 350 500 mv 600 mv i gnd ground pin current (7, 8) v en 3.0v, i out = 100a 80 130 a 170 a v en 3.0v, i out = 50ma 350 650 a 900 a v en 3.0v, i out = 150ma 1.8 2.5 ma 3.0 ma v en 3.0v, i out = 500ma 8 20 ma 25 ma i gnd ground pin quiescent current (8) v en 0.4v (shutdown) 0.05 3 a v en 0.18v (shutdown) 0.10 8 a psrr ripple rejection f = 120hz 75 db i limit current limit v out = 0v 700 900 ma 1000 ma v out /p d thermal regulation note 9 0.05 %/w e no output noise (10) v out = 2.5v, i out = 50ma, 500 nv hz c out = 2.2f, c byp = 0 i out = 50ma, c out = 2.2f, c byp = 470pf 300 nv hz absolute maximum ratings (1) supply input voltage (v in ) .............................. C20v to +20v power dissipation (p d ) .......................... internally limited (3) junction temperature (t j ) all except 1.8v ...................................... C40c to +125c 1.8v only ................................................... 0c to +125c lead temperature (soldering, 5 sec.) ........................ 260c storage temperature (t s ) ........................ C65c to +150c operating ratings (2) supply input voltage (v in ) ............................ +2.5v to +16v enable input voltage (v en ) ................................... 0v to v in junction temperature (t j ) all except 1.8v ...................................... C40c to +125c 1.8v only ................................................... 0c to +125c package thermal resistance ................................... note 3
feb ruary 2006 5 m9999-022106 mic5209 micrel, inc. enable input v enl enable input logic-low voltage v en = logic low (regulator shutdown) 0.4 v 0.18 v v en = logic high (regulator enabled) 2.0 v i enl enable input current v enl 0.4v 0.01 C1 a v enl 0.18v 0.01 C2 a i enh v enh 2.0v 5 20 a 25 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 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 will go into thermal shutdown. see table 1 and the thermal considerations section for details. 4. output voltage temperature coef?cient is the worst case voltage change divided by the total temperature range. 5. 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 thermal regulation speci?cation. 6. dropout voltage is de?ned as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1v differen - tial. 7. ground pin current is the regulator quiescent current plus pass transistor base current. the total current drawn from the supply is the sum of the load current plus the ground pin current. 8. 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.] 9. 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 ef - fects. speci?cations are for a 500ma load pulse at v in = 16v for t = 10ms. 10. c byp is an optional, external bypass capacitor connected to devices with a byp (bypass) or adj (adjust) pin. [so-8 (m) and to-263-5 (u) packages only]. 11. speci?cation for packaged product only.
mic5209 micrel, inc. m9999- 0 22106 6 february 2006 block diagrams current limit thermal shutdown in out gnd bandgap ref. c out v out v in mic5209-x.xbs low-noise fixed regulator (sot-223 version only) in en out byp c byp (optional) gnd v ref bandgap ref. current limit thermal shutdown c out v out v in mic5209-x.xbm/u ultra-low-noise fixed regulator in en out c byp (optional) gnd v ref bandgap ref. current limit thermal shutdown c out v out v in r1 r2 mic5209bm/u [adj.] adj ultra-low-noise adjustable regulator
feb ruary 2006 7 m9999-022106 mic5209 micrel, inc. typical characteristics -100 -80 -60 -40 -20 0 1e+ 1 1e+ 2 1e+ 3 1e+ 4 1e+ 5 1e+ 6 1e+7 ) b d ( r r s p frequency (hz) power supply rejection ratio i out = 100 a c out = 1 f v in = 6v v out = 5v 10 100 1k 10k 100k 1m 10m -100 -80 -60 -40 -20 0 1e+ 1 1e+ 2 1e+ 3 1e+ 4 1e+ 5 1e+ 6 1e+7 ) b d ( r r s p frequency (hz) power supply rejection ratio i out = 1ma c out = 1 f v in = 6v v out = 5v 10 100 1k 10k 100k 1m 10m -100 -80 -60 -40 -20 0 1e+ 1 1e+ 2 1e+ 3 1e+ 4 1e+ 5 1e+ 6 1e+7 ) b d ( r r s p frequency (hz) power supply rejection ratio i out = 100ma c out = 1 f v in = 6v v out = 5v 10 100 1k 10k 100k 1m 10m -100 -80 -60 -40 -20 0 1e+ 1 1e+ 2 1e+ 3 1e+ 4 1e+ 5 1e+ 6 1e+7 ) b d ( r r s p frequency (hz) power supply rejection ratio i out = 100 a c out = 2.2 f c byp = 0.01 f v in = 6v v out = 5v 10 100 1k 10k 100k 1m 10m -100 -80 -60 -40 -20 0 1e+ 1 1e+ 2 1e+ 3 1e+ 4 1e+ 5 1e+ 6 1e+7 ) b d ( r r s p frequency (hz) power supply rejection ratio i out = 1ma c out = 2.2 f c byp = 0.01 f v in = 6v v out = 5v 10 100 1k 10k 100k 1m 10m -100 -80 -60 -40 -20 0 1e+ 1 1e+ 2 1e+ 3 1e+ 4 1e+ 5 1e+ 6 1e+7 ) b d ( r r s p frequency (hz) power supply rejection ratio i out = 100ma c out = 2.2 f c byp = 0.01 f v in = 6v v out = 5v 10 100 1k 10k 100k 1m 10m 0 10 20 30 40 50 60 0 0. 1 0. 2 0. 3 0.4 ) b d ( n o i t c e j e r e l p p i r voltage drop (v) power supply ripple rejection vs. voltage drop i out = 100ma 10ma 1ma c out = 1 f 0 10 20 30 40 50 60 70 80 90 100 0 0. 1 0. 2 0. 3 0.4 ) b d ( n o i t c e j e r e l p p i r voltage drop (v) power supply ripple rejection vs. voltage drop i out = 100ma 10ma 1ma c out = 2.2 f c byp = 0.01 f 0.0001 0.001 0.01 0.1 1 10 1e+ 1 1e+ 2 1e+ 3 1e+ 4 1e+ 5 1e+ 6 1e+7 ( e s i o n / v ) z h frequency (hz) noise performance 10 100 1k 10 k 100 k 1 m 10m 10ma, c out = 1 f v out = 5v 0.0001 0.001 0.01 0.1 1 10 1e+ 1 1e+ 2 1e+ 3 1e+ 4 1e+ 5 1e+ 6 1e+7 ( e s i o n / v ) z h frequency (hz) noise performance 10ma 1ma 100ma 10 100 1k 10 k 100k 1m 10m v out = 5v c out = 10 f electrolytic 0.0001 0.001 0.01 0.1 1 10 1e+ 1 1e+ 2 1e+ 3 1e+ 4 1e+ 5 1e+ 6 1e+7 ( e s i o n / v ) z h frequency (hz) noise performance 10ma 1ma 100ma 10 100 1k 10 k 100k 1m 10m v out = 5v c out = 10 f electrolytic c byp = 100pf 0 100 200 300 400 0 10 0 20 0 30 0 40 0 500 ) v m ( e g a t l o v t u o p o r d output current (ma) dropout voltage vs. output current
mic5209 micrel, inc. m9999- 0 22106 8 february 2006 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 0 1 2 3 4 5 6 7 8 9 ) v ( e g a t l o v t u p t u o input voltage (v) dropout characteristics i l =100 a i l =100ma i l =500ma 0 2 4 6 8 10 12 0 10 0 20 0 30 0 40 0 500 ) a m ( t n e r r u c d n u o r g output current (ma) ground current vs. output current 0 5 10 15 20 25 0 1 2 3 4 5 6 7 8 9 ) a m ( t n e r r u c d n u o r g input voltage (v) ground current vs. supply voltage i l =500ma 0 0.5 1.0 1.5 2.0 2.5 3.0 0 2 4 6 8 ) a m ( t n e r r u c d n u o r g input voltage (v) ground current vs. supply voltage i l =100 ma i l =100 a
feb ruary 2006 9 m9999-022106 mic5209 micrel, inc. applications information enable/shutdown enable is available only on devices in the so-8 (m) and to-263-5 (u) packages. 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 capacitor 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 c byp is not used (see figure 1). 2.2f minimum is recommended when c byp 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 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 C30c, solid tantalums are recommended for operation below C25c. 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. refer to slot-1 power supply 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. package ja jc sot-223 (s) 50c/w 8c/w so-8 (m) 50c/w 20c/w to-263-5 (u) 2c/w 3x3 mlf (ml) 63 c/w 2 c/w table 1. mic5209 thermal resistance 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, please refer to mi - crel 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 regulator thermals section of micrels designing with low- dropout voltage regulators handbook. low-voltage operation the mic5209-1.8 and mic5209-2.5 require 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 - rated for a short time, while the error ampli?er and voltage reference are being powered up more slowly from the output (see block diagram). selecting 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 bypass 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 at 1.8v output (?xed and adjustable) is 0?c to +125?c.
mic5209 micrel, inc. m9999- 0 22106 10 february 2006 fixed regulator circuits mic5209-x.xbm i n out gnd 1 f v in v out e n byp 1 2 5 C 8 3 4 figure 1. low-noise fixed voltage regulator figure 1 shows a basic mic5209-x.xbm (so-8) ?xed-voltage regulator circuit. see figure 5 for a similar con?guration us - ing the more thermally-ef?cient mic5209-x.xbs (sot-223). a 1f minimum output capacitor is required for basic ?xed- voltage applications. mic5209-x.xbm i n out gnd 470pf v in e n byp 1 2 5 C 8 3 4 2.2 f v out figure 2. ultra-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. adjustable regulator circuits mic5209bm i n out gnd v in e n adj 1 2 5 C 8 3 4 1 f v out r1 r2 figure 3. low-noise adjustable voltage regulator the mic5209bm/u 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: v = 1.242v + r2 r1 out 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 mic5209bm/u. although adj is a high-impedance input, for best performance, r2 should not exceed 470k. mic5209bm i n out gnd v in e n adj 1 2 5 C 8 3 4 2.2 f v out r1 r2 470pf figure 4. ultra-low-noise adjustable application. figure 4 includes the optional 470pf bypass capacitor from adj to gnd to reduce output noise. slot-1 power supply intels 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 depen - dant 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 perfor - mance of 2.5v 3% at 500ma allows adequate margin for all systems, and its 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. mic5209-x.xbs i n out gnd c out 22 f v in v out 1 2,tab 3 c in 0.1 f 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 criti - cal. c in bypasses the internal circuitry and should be at least 0.1f. c out provides output ?ltering, improves transient response, and compensates the internal regulator control loop. its value should be at least 22f. c in and c out may be increased as much as desired. slot-1 power supply power dissipation powered from a 3.3v supply, the slot-1 power supply of figure 5 has a nominal ef?ciency of 75%. at the maximum anticipated slot 1 load (320ma), the nominal power dissipa - tion is only 256mw. the sot-223 package has suf?cient thermal characteristics for wide design margins when mounted on a single 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.
feb ruary 2006 11 m9999-022106 mic5209 micrel, inc. considering worst case tolerances, the power dissipation could be as high as: (v in(max) C v out(max) ) i out + v in(max) i gnd [(3.6v C 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: ja j(max ) a d t t p = ? sa = ja = jc t a 40c 50c 60c 75c ja (limit) 209c/w 184c/w 160c/w 123c/w sa sot-223 201c/w 176c/w 152c/w 115c/w sa so-8 184c/w 159c/w 135c/w 98c/w sa to-263-5 207c/w 182c/w 158c/w 121c/w table 2. maximum allowable thermal resistance table 2 and figure 6 show that the slot-1 power supply ap - plication can be implemented with a minimum footprint layout. figure 6 shows the necessary copper pad area to obtain speci?c heat sink thermal resistance ( sa ) values. the sa values in table 2 require much less than 500mm 2 of copper, according to figure 6, and can easily be accomplished with the minimum footprint. 0 10 20 30 40 50 60 70 0 200 0 400 0 6000 copper heat sink area (mm 2 ) figure 6. pcb heat sink thermal resistance
mic5209 micrel, inc. m9999- 0 22106 12 february 2006 package information sot-223 (s) 8-pin soic (m)
feb ruary 2006 13 m9999-022106 mic5209 micrel, inc. 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 this information furnished by micrel in this data sheet is believed to be accurate and reliable. however no responsibility is assumed by micrel for its use. micrel reserves the right to change circuitry and speci?cations at any time without noti?cation to the customer. 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 systems 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 signi? cant injury to the user. a purchaser's use or sale of micrel products for use in life support appliances, 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. ? 2004 micrel incorporated 1 1 3 4 1 2 3 4 2 1 to-263-5 (u) 8-pin 3mm x 3mm mlf (ml)

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