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mic2920a/29201/29202/29204 micrel, inc. february 2005 1 m9999-021505 mic2920a/29201/29202/29204 400ma low-dropout voltage regulator features ? high output voltage accuracy ? guaranteed 400ma output ? low quiescent current ? low dropout voltage ? extremely tight load and line regulation ? very low temperature coef?cient ? current and thermal limiting ? input withstands C20v reverse battery and 60v positive transients ? error ?ag warns of output dropout ? logic-controlled electronic shutdown ? output programmable from 1.24v to 26v (mic29202/mic29204) ? available in to-220-3, to-220-5, and surface-mount to-263-5, sot-223, and so-8 packages. applications ? battery-powered equipment ? cellular telephones ? laptop, notebook, and palmtop computers ? pcmcia v cc and v pp regulation/switching ? bar code scanners ? automotive electronics ? smps post-regulators ? voltage reference ? high-ef?ciency linear power supplies general description the mic2920a family are bulletproof, ef?cient voltage regu- lators with very low dropout voltage (typically 40mv at light loads and 370mv at 250ma), and very low quiescent current (140a typical). the quiescent current of the mic2920a in- creases only slightly in dropout, prolonging battery life. key mic2920a features include protection against reversed bat- tery, fold-back current limiting, and automotive load dump protection (60v positive transient). the mic2920 is available in several con?gurations. the mic2920a-x.x devices are three pin ?xed voltage regulators available in 3.3v, 4.85v, 5v, and 12v outputs. the mic29201 is a ?xed regulator offering a logic compatible on/off (shut- down) input and an error ?ag output. this ?ag may also be used as a power-on reset signal. a logic-compatible shutdown input is provided on the adjustable mic29202 which allows the regulator to be switched on and off. the mic29204 8-pin soic adjustable regulator includes both shutdown and error ?ag pins and may be pin-strapped for 5v output or p rogrammed from 1.24v to 26v using two external resistors. mic2920a-xxbt (to-220) mic29201/29202bt (to-220-5) mic29201/29202bu (to-263-5) 5-lead package pinouts mic29201 mic29202 1) error adjust 2) input shutdown 3) ground ground 4) output input 5) shutdown output tab is ground on sot-223, to-220, and to-263 packages. 1 3 2 tab input output ground mic2920a-x.xbs (sot-223) pin con?guration 12 3 4 87 6 5 input nc nc e r r o r ou tp u t s e n s e shu tdown g r ou nd mic29201-3.3bm (soic-8) 12 3 4 87 6 5 input a d j u st 5v?tap e r r o r ou tp u t s e n s e shu tdown g r ou nd mic29204bm (soic-8) micrel, inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? tel + 1 (408) 944-0800 ? fax + 1 (408 ) 474-1000 ? http://www.micrel.com tab 5 4 3 2 1 tab 3 ou t 2 gnd 1 in tab 5 4 3 2 1 downloaded from: http:///
mic2920a/29201/29202/29204 micrel, inc. m9999-021505 2 february 2005 ordering information part number voltage junction temp. range package standard pb-free mic2920a-3.3bs mic2920a-3.3ws* 3.3v -40c to +125c sot-223 mic2920a-3.3bt mic2920a-3.3wt* 3.3v -40c to +125c to-220-3 mic2920a-4.8bs mic2920a-4.8ws* 4.85v -40c to +125c sot-223 mic2920a-4.8bt mic2920a-4.8wt* 4.85v -40c to +125c to-220-3 mic2920a-5.0bs mic2920a-5.0ws* 5.0v -40c to +125c sot-223 mic2920a-5.0bt mic2920a-5.0wt* 5.0v -40c to +125c to-220-3 mic2920a-12bs mic2920a-12ws* 12v -40c to +125c sot-223 mic2920a-12bt mic2920a-12wt* 12v -40c to +125c to-220-3 mic29201-3.3bm mic29201-3.3ym 3.3v -40c to +125c so-8 mic29201-3.3bt mic29201-3.3wt* 3.3v -40c to +125c to-220-5 mic29201-3.3bu mic29201-3.3wu* 3.3v -40c to +125c to-263-5 mic29201-4.8bt mic29201-4.8wt* 4.85v -40c to +125c to-220-5 mic29201-4.8bu mic29201-4.8wu* 4.85v -40c to +125c to-263-5 mic29201-5.0bt mic29201-5.0wt* 5.0v -40c to +125c to-220-5 mic29201-5.0bu mic29201-5.0wu* 5.0v -40c to +125c to-263-5 mic29201-12bt mic29201-12wt* 12v -40c to +125c to-220-5 mic29201-12bu mic29201-12wu* 12v -40c to +125c to-263-5 mic29202bt mic29202wt* adj -40c to +125c to-220-5 mic29202bu mic29202wu* adj -40c to +125c to-263-5 mic29204bm mic29204ym 5v and adj -40c to +125c so-8 mic29204bn mic29204yn 5v and adj -40c to +125c 8-pin pdip * pb-free rohs compliant with high-melting solder exemption. downloaded from: http:///
mic2920a/29201/29202/29204 micrel, inc. february 2005 3 m9999-021505 absolute maximum ratings input supply voltage .................................................C20v to +60v adjust input voltage (notes 9 and 10) ......................C1.5v to +26v power dissipation ................................... internally limited, note 1 operating junction temperature range ............. C40c to +125c lead temperature (soldering, 5 seconds) ............................260c storage temperature range ............................... C65c to +150c if military/aerospace speci?ed devices are required, contact your local micrel representative/distributor for availability and speci?cations. operating ratings operating input supply voltage ......................................2v ? to 26v adjust input voltage (notes 9 and 10) ......................C1.5v to +26v shutdown input voltage ..........................................C0.3v to +30v error comparator output voltage ............. C0.3v to +30voperating junction temperature range ............................. C40c to +125c thermal characteristics: sot?223 jc .............................................................. 15c/w to-220 jc ................................................................... 3c/w to-263 jc ................................................................... 3c/w 8-pin soic ja ............................................................. note 1 ? across the full operating temperature, the minimum input voltage range for full output current is 4.3v to 26v. output will remain in-regulation at lower output voltages and low current loads down to an input of 2v at 25c. electrical characteristics limits in standard typeface are for t j = 25c and limits in boldface apply over the full operating temperature range. unless otherwise speci?ed, v in = v out + 1v, i l = 1ma, c l = 10f. adjustable versions are set for an ouptu of 5v. the mic29202 v shutdown 0.7v. the eight pin mic29204 is con?gured with the adjust pin tied to the 5v tap, the output is tied to output sense (v out = 5v), and v shutdown 0.7v. symbol parameter conditions min typ max units v o output voltage accuracy variation from factory trimmed v out -1 -2 1 2 % 1ma i l 400ma, across temp. range -2.5 2.5 mic2920a-12 and 29201-12 only -1.5 -3 1.5 3 1ma i l 400ma, across temp. range -4 4 ?v o ?t output voltage temperature coef. (note 2) 20 100 ppm/c v out > 10v only 80 350 ?v o v o line regulation v in = v out + 1v to 26v 0.03 0.10 0.40 % ?v o v o load regulation il = 1 to 250ma (note 3) 0.04 0.16 0.30 % v in - v o dropout voltage (note 4) i l = 1ma i l = 100ma v out > 10v only i l = 250ma v out > 10v only i l = 400ma 100 250 350 370 500 400 150 180 600 750 mv i gnd ground pin current (note 5) i l = 1ma i l = 100ma i l = 250ma i l = 400ma 140 1.3 5 13 200 300 2 2.5 9 12 15 a ma i gnddo ground pin current at dropout (note 5) v in = 0.5v less than designed v out (v out = 3.3v) i o = 1ma 180 400 a i limit current limit v out = 0v (note 6) 425 100 1200 ma ?v o ?p d thermal regulation (note 7) 0.05 0.2 %/w e n output noise voltage (10hz to 100khz) il = 100ma cl = 10f cl = 100f 400 260 v rms downloaded from: http:///
mic2920a/29201/29202/29204 micrel, inc. m9999-021505 4 february 2005 parameter conditions min typ max units mic29202, mic29204 reference voltage mic29202 1.223 1.210 1.235 1.247 1.260 v reference voltage mic29202 (note 8) 1.204 1.266 v reference voltage mic29204 1.210 1.200 1.235 1.260 1.270 v reference voltage mic29204 (note 8) 1.185 1.285 v adjust pin bia current 20 40 60 na reference voltage temperature coef?cient (note 7) 20 ppm/c adjust pin bias current temperature coef?cient 0.1 na/c error comparator mic29201, mic29204 output leakage current v oh = 26v 0.01 1.00 2.00 a output low voltage v in = 4.5v i ol = 250a 150 250 400 mv upper threshold voltage (note 9) 40 25 60 mv lower threshold voltage (note 9) 75 95 140 mv hysteresis (note 9) 15 mv shutdown input mic29201, mic29202, mic29204 input logic voltage low (on) high (off) 2.0 1.3 0.7 v shutdown pin input current v shutdown = 2.4v 30 50 100 a v shutdown = 26v 450 600 750 a regulator output current in shutdown (note 10) 3 10 20 a downloaded from: http:///
mic2920a/29201/29202/29204 micrel, inc. february 2005 5 m9999-021505 notes: general: devices are esd protected; however, handling precautions are recommended. note 1: absolute maximum ratings indicate limits beyond which damage to the component may occur. electrical speci?cations do not apply when operating the device outside of its rated operating conditions. the maximum allowable power dissipa tion is a function of the maximum junction temperature, t j (max) , the junction-to-ambient thermal resistance, ja , and the ambient temperature, t a . the maximum allowable power dissipation at any ambient temperature is calculated using: p (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 shutdo wn. the junction to ambient thermal resistance of the mic29204bm is 160c/w mounted on a pc board. note 2: output voltage temperature coef?cient is de?ned as the worst case voltage change divided by the tot al temperature range. note 3: regulation is measured at constant junction temperature using low duty cycle pulse testing. changes in output voltage due to heating effects are covered by the thermal regulation speci?cation. note 4: dropout voltage is de?ned as the input to output differential at which the output voltage drops 100 mv below its nominal value measured at 1v differential. at low values of programmed output voltage, the minimum input supply voltage of 4. 3v over temperature must be taken into account. the mic2920a operates down to 2v of input at reduced output current at 25c. note 5: ground pin current is the regulator quiescent current. the total current drawn from the supply is t he sum of the load current plus the ground pin current. note 6: the mic2920a features fold-back current limiting. the short circuit (v out = 0v) current limit is less than the maximum current with normal output voltage. note 7: thermal regulation is de?ned as the change in output voltage at a time t after a change in power di ssipation is applied, excluding load or line regulation effects. speci?cations are for a 200ma load pulse at v in = 20v (a 4w pulse) for t = 10ms. note 8: v ref v out (v in C 1 v), 4.3v v in 26v, 1 ma < i l 400 ma, t j t j max. note 9: comparator thresholds are expressed in terms of a voltage differential at the adjust terminal below the nominal reference voltage measured at 6v input. to express these thresholds in terms of output voltage change, multiply by the error a mpli?er gain = v out /v ref = (r1 + r2)/r2. for example, at a programmed output voltage of 5v, the error output is guaranteed to go low when th e output drops by 95 mv x 5v/1.235 v = 384 mv. thresholds remain constant as a percent of vout as vout is varied, with the dropout warni ng occurring at typically 5% below nominal, 7.7% guaranteed. note 10: v shutdown 2v, v in 26v,v out = 0, with adjust pin tied to 5v tap or to the r1, r2 junction (see figure 3) with r1 150k. note 11: when used in dual supply systems where the regulator load is returned to a negative supply, the out put voltage must be diode clamped to ground. note 12: maximum positive supply voltage of 60v must be of limited duration (< 100ms) and duty cycle ( 1%). the maximum continuous supply voltage is 26v. a d j u s t s e n s e q15a out q24 q26 r27 v?tap r28 r18 20k ? q25 q23 q22 r15 100 k ? r16 30 k ? q29 q28 r17 10 ? r21??8 ? r17 12 k ? q31 q30 r23??60 k ? shdn r24 50 k ? r22 150 k ? q21 q19 c2 40?pf r14 350 k ? q14 r13 100 k ? q18 r12 110 k ? q20 q9 q15b q8 q7 r11 20.6 k ? q5 r8 31.4 k ? r10 150 k ? r9 27.8 k ? q11 q12 q13 r6 140 k ? r5 180 k ? r4 13 k ? r3 50 k ? q2 c1 20 pf q4 q3 r11 18 k ? q6 q1 10 r1 20 k ? r2 50 k ? q41 r30 30 k ? q40 q34 gnd q36 q37 r25 2.8 k ? q38 e r r o r r26 60 k ? q39 q42 q16 q17 50 k ? 10 k ? in d e no t e s ? co nne ct i o n? o n mic2920a-xx?and?mic29201-xx v e r s i o n s ? o n l y schematic diagram downloaded from: http:///
mic2920a/29201/29202/29204 micrel, inc. m9999-021505 6 february 2005 typical characteristics 0 100 200 300 400 500 0 100 200 300 400 dropout?voltage?(mv) output?current?(ma) dropout v oltage vs . output c urrent 0 100 200 300 400 500 600 700 -60 -30 0 30 60 90 120 150 dropout?voltage?(mv) temperature ( c) dropout v oltage vs . t emperature i load = 400ma 0 1 2 3 4 5 6 0 1 2 3 4 5 6 output?voltage?(v) input?voltage?(v) dropout c harac teris tic s i load = 1ma i load = 400ma 0.1 1 10 20 1 10 100 400 ground?current?(ma) output?current?(ma) g round c urrent vs . output c urrent 0 50 100 150 200 0 1 2 3 4 5 6 7 8 ground?current ( a) supply?voltage?(v) g round c urrent vs . s upply v oltage v out = 5v i out = 1ma 0 5 10 15 20 25 30 0 2 4 6 8 10 ground?current?(ma) input?voltage?(v) g round c urrent vs . s upply v oltage v out = 5v i out = 400ma 0.00 0.05 0.10 0.15 0.20 -60 -30 0 30 60 90 120 150 ground?current?(ma) temperature ( c) g round c urrent vs . t emperature i out = 1ma 0 1 2 3 -60 -30 0 30 60 90 120 150 ground?current?(ma) temperature ( c) g round c urrent vs . t emperature i load = 100ma 0 5 10 15 20 25 -60 -30 0 30 60 90 120 150 ground?current?(ma) temperature ( c) g round c urrent vs . t emperature i load = 400ma 3.20 3.22 3.24 3.26 3.28 3.30 3.32 3.34 3.36 3.38 3.40 -60 -30 0 30 60 90 120 150 output?voltage?(v) temperature ( c) f ixed 3.3v output v oltage vs . t emperature 300 350 400 450 500 550 600 650 700 -60 -30 0 30 60 90 120 150 current?(ma) temperature ( c) s hort c irc uit and maximum c urrent vs . t emperature v out = v nominal ?C 0.5v v out = 0v 3 s amp le s (hi/av g /lo) v out = 3.3v -100 0 100 200 300 400 500 600 700 800 900 1000 -30 -20 -10 0 10 20 30 ground?current ( a) input?voltage?(v) g round c urrent vs . s upply v oltage r load = 100 ? downloaded from: http:///
mic2920a/29201/29202/29204 micrel, inc. february 2005 7 m9999-021505 -200 0 200 400 600 -5 0 5 10 15 20 25 output?(ma) time?(ms) l oad t rans ient -200 -100 0 100 200 ? ?output?(mv) c out = 10 f 1ma -200 0 200 400 600 -5 0 5 10 15 20 25 output?(ma) time?(ms) l oad t rans ient -100 -50 0 50 100 ? ?output?(mv) c out = 100 f 1ma 0 10 20 30 40 50 -60 -30 0 30 60 90 120 150 adjust?pin?current?(na) temperature ( c) mic 29202 a djus t p in c urrent vs . t emperature i load = 1ma -40 -20 0 20 40 ? ?output?(mv) 4 6 8 10 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 input?(v) time?(ms) l ine t rans ient c out = 10 f i l = 10ma -20 -10 0 10 20 ? ?output?(mv) 4 6 8 10 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 input?(v) time?(ms) l ine t rans ient c out = 100 f i l = 10ma 0.01 0.1 1 10 1x10 0 10x10 0 100x10 0 1x10 3 10x10 3 100x10 3 1x10 6 output?impedance ( ? ) frequency?(hz) output impedanc e vs . f requenc y i load = 10ma 10 100 1 1k 10k 100k 1m 0 25 50 75 100 125 -60 -30 0 30 60 90 120 150 enable?current ( a) temperature ( c) mic 29201/2 s hutdown c urrent vs . t emperaure v e n = 5v v e n = 2v -100 -80 -60 -40 -20 0 1e+1 1e+2 1e+3 1e+4 1e+5 1e+6 rejection?(db) frequency?(hz) r ipple r ejec tion 10 1m 1k 100 10k 100k i l = 100ma 1ma c l = 10 f downloaded from: http:///
mic2920a/29201/29202/29204 micrel, inc. m9999-021505 8 february 2005 or some other supply voltage. in determining a value for this resistor, note that while the output is rated to sink 250a, this sink current adds to battery drain in a low battery condition. suggested values range from 100k to 1m. the resistor is not required if this output is unused. programming the output voltage (mic29202/29204) the mic29202/29204 may be programmed for any output voltage between its 1.235v reference and its 26v maxi- mum rating, using an external pair of resistors, as shown in figure 3. the complete equation for the output voltage is v out = v ref { 1 + r 1 /r 2 } C | i fb | r 1 where v ref is the nominal 1.235 reference voltage and i fb is the adjust pin bias current, nominally 20na. the minimum rec- ommended load current of 1a forces an upper limit of 1.2m on the value of r 2 , if the regulator must work with no load (a condition often found in cmos in standby), i fb will produce a C2% typical error in v out which may be eliminated at room temperature by trimming r 1 . for better accuracy, choosing r 2 = 100k reduces this error to 0.17% while increasing the resistor program current to 12a. since the mic29202/29204 t ypically draws 110a at no load with shutdown open-circuited, this is a negligible addition. the mic29204 may be pin-strapped for 5v using the internal voltage divider by tying pin 1 (output) to pin 2 (sense) and pin 7 (adjust) to pin 6 (v tap). con?guring the mic29201-3.3bm for the mic29201-3.3bm, the output (pin 1) and sense pin (pin 2), must be connected to ensure proper operation. they are not connected internally. reducing output noise in reference applications it may be advantageous to reduce the ac noise present at the output. one method is to reduce the regulator bandwidth by increasing the size of the output capacitor. this is relatively inef?cient, as increa sing the capaci- figure 1. error output timing * see applications information applications information external capacitors a 10f (or greater) capacitor is required between t he mic2920a output and ground to prevent oscillations due to in stability. most types of tantalum or aluminum electrolytics will be adequate; ?lm types will work, but are costly and therefore not recom- mended. many aluminum electrolytics have electrolytes that freeze at about C30c, so solid tantalums are recommended for operation below C25c. the important parameters of the capacitor are an effective series resistance of about 5 or less and a resonant frequency above 500khz. the value of this capacitor may be increased without limit. at lower values of output current, less output capacitance is required for output stability. the capacitor can be reduced to 2.2f for current below 10ma or 1f for currents below 1ma. adjusting the mic29202/29204 to voltages below 5v runs the error ampli?er at lower gains so that more output ca- pacitance is needed. for the worst-case situation of a 500ma load at 1.23v output (output shorted to adjust) a 47f (or greater) capacitor should be used. the mic2920a/29201 will remain in regulation with a mini- mum load of 1ma. when setting the output voltage of the mic29202/29204 versions with external resistors, the current through these resistors may be included as a portion of the minimum load. a 0.1f capacitor should be placed from the mic2920a input to ground 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. error detection comparator output (mic29201/mic29204) a logic low output will be produced by the comparator when- ever the mic29201/29204 output falls out of regulation by more than approximately 5%. this ?gure is the comparators built-in offset of about 75mv divided by the 1.235v reference voltage. (refer to the block diagram on page 1). this trip level remains 5% below normal regardless of the programmed output voltage of the mic29201/29204. for example, the error ?ag trip level is typically 4.75v for a 5v output or 11.4v for a 12v output. the out of regulation condition may be due either to low input voltage, extremely high input voltage, cur- rent limiting, or thermal limiting. figure 1 is a timing diagram depicting the error signal and the regulated output voltage as the mic29201/29204 input is ramped up and down. the error signal becomes valid (low) at about 1.3v input. it goes high at about 5v input (the input voltage at which v out = 4.75). since the mic29201/29204s dropout voltage is load-dependent (see curve in typical per- formance characteristics), the input voltage trip point (about 5v) will vary with the load current. the output voltage trip point (approximately 4.75v) does not vary with load. the error comparator has an npn open-collector outp ut which requires an external pull-up resistor. depending on system requirements, this resistor may be returned to the 5v output 4.75v e r r o r o u t pu t voltage input 5v 1.3v voltage not?* valid not?* valid downloaded from: http:///
mic2920a/29201/29202/29204 micrel, inc. february 2005 9 m9999-021505 shut- down v gnd 4 7 8 out +v in adjust 1 3 shutdowninput 100pf 2n2222 1% 300k ? ?5.3v 1% 180k ? + 10f 470 k ? high?=?off low?=?on low?=?3.3v?out 220k ? 1% v cc ??out high?=?5v?out automotive applications the mic2920a is ideally suited for automotive applications for a variety of reasons. it will operate over a wide range of input voltages with very low dropout voltages (40mv at light loads), and very low quiescent currents (100a typi cal). these features are necessary for use in battery powered systems, such as automobiles. it is a bulletproof device with the abil- ity to survive both reverse battery (negative transients up to 20v below ground), and load dump (positive transients up to 60v) conditions. a wide operating temperature range with low temperature coef?cients is yet another reason to use these versatile regulators in automotive designs. tor from 1f to 220f only decreases the noise from 430v to 160v rms for a 100khz bandwidth at 5v output. noise can be reduced fourfold by a bypass capacitor across r 1 , since it reduces the high frequency gain from 4 to unity. pick or about 0.01f. when doing this, the output capacitor must be increased to 10f to maintain stability. these changes re- duce the output noise from 430v to 100v rms for a 100khz bandwidth at 5v output. with the bypass capacitor added, noise no longer scales with output voltage so that improve- ments are more dramatic at higher output voltages. note: pins 2 and 6 are left open in out gnd adj u st e r r o r 53 4 1 8 shutdown v v e r r o r o u t pu t shutdown input in +v 100k ? out v 1.2 26v 1 r 100 pf 10f 2 r 1.23v r e f v 7 v out ?= v r e f ?x?(1?+ ) 1 r 2 r o f f on in out gnd v +v in v out v =?5v 10f + figure 2. mic2920a-5.0 fixed +5v regulator figure 3. mic29202/29204 adjustable regulator. pinout is f or mic29204. typical applications figure 5. mic29202/29204 5.0v or 3.3v selectable regulator with shutdown. pinout is for mic29204. figure 4. mic29204 wide input voltage range current limiter pin 3 low= enable output. q1 on = 3.3v, q1 off = 5.0v. c bypass 1 2 r1 ? 200 hz = in out gnd adj u st e r r o r 53 4 1 8 sd v +v e r r o r o u t pu t shutdown input in +v out *v 7 o f f on in =?v *?minimum?input-output?voltage?ranges?from?40mv?to? 400mv,?depending?on?load?current downloaded from: http:///
mic2920a/29201/29202/29204 micrel, inc. m9999-021505 10 february 2005 package information 8-pin soic (m) 16 10 0.84?(0.033) 0.64?(0.025) 1.04?(0.041) 0.85?(0.033) ???2.41?(0.095) ??2.21?(0.087) ??4.7?(0.185) ?4.5?(0.177) 6.70?(0.264) 6.30?(0.248) 7.49?(0.295) 6.71?(0.264) 3.71?(0.146) 3.30?(0.130) ?3.15?(0.124) ?2.90?(0.114) ?10 max 0.10?(0.004) 0.02?(0.0008) 0.38?(0.015) 0.25?(0.010) c l dimensions: mm?(inch) c l 1.70?(0.067) 1.52?(0.060) 0.91?(0.036)?min sot-223 (s) downloaded from: http:///
mic2920a/29201/29202/29204 micrel, inc. february 2005 11 m9999-021505 3-lead to-220 (t) 5-lead to-220 (t) downloaded from: http:///
mic2920a/29201/29202/29204 micrel, inc. m9999-021505 12 february 2005 1 1 3 4 1 2 3 4 2 1 5-lead to-263 (u) 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 t he 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. ? 1998 micrel incorporated downloaded from: http:///

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