View MIC5239-15YS-TR_8613297.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

mic5239 low quiescent current 500ma cap ldo regulator mlf and micro leadframe is a registered trademark of amkor technologies micrel inc. 2180 fortune drive san jose, ca 95131 usa tel +1 ( 408 ) 944-0800 fax + 1 (408) 474-1000 http://www.micrel.com december 2007 m9999-121007 general description the mic5239 is a low quiescent current, cap low-dropout regulator. with a maximum operating input voltage of 30v and a quiescent current of 23a, it is ideal for supplying keep-alive power in systems with high voltage batteries. capable of 500ma output, the mic5239 has a dropout voltage of only 350mv. it can provide high output current for applications such as usb. as a cap ldo, the mic5239 is stable with either a ceramic or a tantalum output capacitor. it only requires a 3.3f output capaci tor for stability. the mic5239 includes a logic compatible enable input and an undervoltage error flag indicato r. other features of the mic5239 include thermal shutdown, current limit, overvolt- age shutdown, reverse-leakage protection, and reverse- battery protection. available in the thermally enhanced soic-8, msop-8 and sot-223, the mic5239 comes in fixed 1.5v, 1.8v, 2.5v, 3.0v, 3.3v and 5.0v, and adjus table voltages. for other output voltages, contact micrel. all support documentation can be found on micrels web site at: www.micrel.com. features ? ultra-low quiescent current (i q = 23a @i o = 100a) ? continuous 500ma output current ? wide input range: 2.3v to 30v ? low dropout voltage: 350mv @500ma ? 1.0% initial output accuracy ? stable with ceramic or tantalum output capacitor ? logic compatible enable input ? low output voltage error flag indicator ? overcurrent protection ? thermal shutdown ? reverse-leakage protection ? reverse-battery protection ? high-power soic-8, msop-8 and sot-223 packages applications ? usb power supply ? keep-alive supply in notebook and portable personal computers ? logic supply from high voltage batteries ? automotive electronics ? battery-powered systems ___________________________________________________________________________________________________________ typical application i gnd = 23a v out 3.0v/100a v in 30v in mic5239 en out gnd flg regulator with low i o and low i q 4035 30 25 20 15 10 914 19 24 29 4 i out = 1ma i out = 10a i out = 100a ground current vs. input voltage downloaded from: http:///
micrel mic5239 december 2007 2 m9999-121007 ordering information part number standard pb-free voltage (1) junction temp. range package mic5239-1.5bm mic5239-1.5ym 1.5v C40c to +125c 8-pin soic mic5239-1.5bmm mic5239-1.5ymm 1. 5v C40c to +125c 8-pin msop mic5239-1.5bs mic5239-1.5ys 1.5v C40c to +125c sot-223 mic5239-1.8bm mic5239-1.8ym 1.8v C40c to +125c 8-pin soic mic5239-1.8bmm mic5239-1.8ymm 1. 8v C40c to +125c 8-pin msop mic5239-1.8bs mic5239-1.8ys 1.8v C40c to +125c sot-223 mic5239-2.5bm mic5239-2.5ym 2.5v C40c to +125c 8-pin soic mic5239-2.5bmm mic5239-2.5ymm 2. 5v C40c to +125c 8-pin msop mic5239-2.5bs mic5239-2.5ys 2.5v C40c to +125c sot-223 mic5239-3.0bm mic5239-3.0ym 3.0v C40c to +125c 8-pin soic mic5239-3.0bmm mic5239-3.0ymm 3. 0v C40c to +125c 8-pin msop mic5239-3.0bs mic5239-3.0ys 3.0v C40c to +125c sot-223 mic5239-3.3bm mic5239-3.3ym 3.3v C40c to +125c 8-pin soic mic5239-3.3bmm mic5239-3.3ymm 3. 3v C40c to +125c 8-pin msop mic5239-3.3bs mic5239-3.3ys 3.3v C40c to +125c sot-223 mic5239-5.0bm mic5239-5.0ym 5.0v C40c to +125c 8-pin soic mic5239-5.0bmm mic5239-5.0ymm 5. 0v C40c to +125c 8-pin msop mic5239-5.0bs mic5239-5.0ys 5.0v C40c to +125c sot-223 mic5239bm mic5239ym adj C40c to +125c 8-pin soic mic5239bmm mic5239ymm adj C40c to +125c 8-pin msop note: 1. other voltages available. contact micrel for details. downloaded from: http:///
micrel mic5239 december 2007 3 m9999-121007 pin configuration soic-8 (m) sot-223 (s) soic-8 (m) msop-8(mm) msop-8(mm) (fixed) (adj) pin description pin number msop/soic pin number sot-223 pin name pin function 2 (fixed) flg error flag (output): open-collector output is active low when the output is out of regulation due to insufficient input voltage or excessive load. an external pull-up resistor is required. 2 (adj) adj adjustable feedback input: connect to voltage divider network. 3 1 in power supply input. 4 3 out regulated output. 1 en enable (input): logic low = shutdown; logic high = enabled. 5C8 2 gnd ground: pins 5, 6, 7, and 8 are internally connected in common via the leadframe. downloaded from: http:///
micrel mic5239 december 2007 4 m9999-121007 absolute maximum ratings (1) supply voltage (v in ) ...................................... C20v to +32v enable input voltage (v en )............................ C0.3v to +32v power dissipation (p d ) (3) ...........................internally limited junction temperature (t j ) ........................C40 c to +125 c storage temperature (t s ).........................C65 c to +150 c lead temperature (solde ring, 5 se c.) ........................ 260 c esd rating (4) sot-23-3l ............................................................... 2kv msop-8l .............................................................. 1.5kv operating ratings (2) supply voltage (v in ).......................................... 2.3v to 30v enable input voltage (v en )................................... 0v to 30v junction temperature (t j ) ........................ C40 c to +125 c package thermal resistance msop ( ja )....................................................... 80 c/w sot-223 ( ja )................................................... 50 c/w electrical characteristics (5) v in = v out + 1v; v en 2.0v; i out = 100a; t j = 25c, bold values indicate C40c t j +125c; unless noted. symbol parameter condition min typ max units v out output voltage accuracy variation from nominal v out C1 C2 1 2 % % ? v out /v out line regulation v in = v out +1v to 30v 0.06 0.5 % ? v out /v out load regulation i out = 100a to 500ma (6) 15 30 mv i out = 100a 50 mv i out = 150ma 260 350 400 mv mv ? v dropout voltage (7) i out = 500ma 350 mv v en 2.0v, i out = 100a 23 40 45 a a v en 2.0v, i out = 150ma 1.3 5 ma i gnd ground pin current v en 2.0v, i out = 500ma 8.5 15 ma i gnd(shdn) ground pin shutdown v en 0.6v, v in = 30v 0.1 1 a i sc short circuit current v out = 0v 850 1200 ma e n output noise 10hz to 100khz, v out = 3.0v, c l = 3.3f 160 vrms flag output low threshold % of v out 94 % v flg high threshold % of v out 95 % v ol flag output low voltage v in = v out(nom) C 0.12v out , i ol = 200a 150 mv i leak flag output leakage v oh = 30v 0.1 a enable input v il input low voltage regulator off 0.6 v v ih input high voltage regulator on 2.0 v v en = 0.6v, regulator off C1.0 C2.0 0.01 1.0 2.0 a a v en = 2.0v, regulator on 0.15 1.0 2.0 a a i in enable input current v en = 30v, regulator on 0.5 2.5 5.0 a a downloaded from: http:///
micrel mic5239 december 2007 5 m9999-121007 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) C t a ) ja . exceeding the maximum allowable power dissipation will result in excessive die temper ature, and the regulator will go into thermal shutdown. the ja of the mic5239- x.xbmm (all versions) is 80c/w, the mic5239-x.xbm (all versions) is 63c/w, and the mic5239-x.xbs (all versions) is 50c/w mou nted on a pc board, see thermal characteristics for further details. 4. devices are esd sensitive. handling prec autions recommended. human body model, 1.5k ? in series with 100pf. 5. specification for packaged product only. 6. regulation is measured at constant junc tion temperature using pulse testing with a low duty-cycle. changes in output voltag e due to heating effects are covered by the specification for thermal regulation. 7. dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1.0v differential. downloaded from: http:///
micrel mic5239 december 2007 6 m9999-121007 typical characteristics (v out = 3v) downloaded from: http:///
micrel mic5239 december 2007 7 m9999-121007 typical characteristics (continued) (v out = 3v) 0 20 40 60 80 100 120 -20 -10 0 10 )am(tnerructupni supply voltage (v) input current v en = 5v r load = 30 functional characteristics downloaded from: http:///
micrel mic5239 december 2007 8 m9999-121007 functional diagram block diagram fixed voltages block diagram adjustable voltages downloaded from: http:///
micrel mic5239 december 2007 9 m9999-121007 application information the mic5239 provides all of the advantages of the mic2950: wide input voltage range, and reversed- battery protection, with the added advantages of reduced quiescent current and smaller package. additionally, when disabled, quiescent current is reduced to 0.1a. enable a low on the enable pin disables the part, forcing the quiescent current to less than 0.1a. thermal shutdown and the error flag are not functional while the device is disabled. the maximum enable bias current is 2a for a 2.0v input. an open-collector pull-up resistor tied to the input voltage should be set low enough to maintain 2v on the enable input. figure 1 shows an open-collector output driving the enable pin through a 200k ? ? pull-up resistor tied to the input voltage. in order to avoid output oscilla tions, slow transitions from low-to-high should be avoided. c v v 5v v in mic5239 en 200 k 200k out gnd flg figure 1. remote enable input capacitor an input capacitor may be required when the device is not near the source power supply or when supplied by a battery. small, surface mount ceramic capacitors can be used for bypassing. larger values may be required if the source supply has high ripple. output capacitor the mic5239 has been designed to minimize the effect of the output capacitor esr on the closed loop stability. as a result, ceramic or film capacitors can be used at the output. figure 2 displays a range of esr values for a 10f capacitor. virtually any 10f capacitor with an esr less than 3.4 ? is sufficient for stability over the entire input voltage range. stability can also be maintained throughout the specified load and line conditions with 4.7f film or ceramic capacitors. figure 2. output capacitor esr error detection comparator output the flag pin is an open-collector output which goes low when the output voltage drops 5% below its internally programmed level. it senses conditions such as excessive load (current limit), low input voltage, and over temperature conditions. once the part is disabled via the enable input, the error flag output is not valid. overvoltage conditions are not reflected in the error flag output. the error flag output is also not valid for input voltages less than 2.3v. the error output has a low vo ltage of 400mv at a current of 200a. in order to minimize the drain on the source used for the pull-up, a value of 200k ? to 1m ? is suggested for the e rror flag pull-up. th is will guarantee a maximum low voltage of 0.4v for a 30v pull-up potential. an unused error flag can be left unconnected. not valid not valid valid error error flag output input voltage output voltage 4.75v 0v0v 5v 1.3v figure 3. error flag output timing thermal shutdown the mic5239 has integrated thermal protection. this feature is only for protection purposes. the device should never be intentionally operated near this temperature as this may have detrimental effects on the life of the device. the thermal shutdown may become inactive while the enable input is transitioning from a high to a low. when disabling the device via the enable pin, transition from a high to low quickly. this will insure that the output remains disabled in the event of a thermal shutdown. downloaded from: http:///
micrel mic5239 december 2007 10 m9999-121007 current limit figure 4 displays a method fo r reducing the steady state short-circuit current. the duration that the supply delivers current is set by t he time required for the error flag output to discharge the 4.7f capacitor tied to the enable pin. the off time is set by the 200k ? resistor as it recharges the 4.7f capacitor, enabling the regulator. this circuit reduces the shor t-circuit current from 800ma to 40ma while allowing for regulator restart once the short is removed. c out v out v in 5v v err in mic5239 en 200k 1n4148 200k 4.7f out gnd shutdown enable flg figure 4. remote enable with short-circuit current foldback thermal characteristics the mic5239 is a high input voltage device, intended to provide 500ma of continuous output current in two very small profile packages. the power msop-8 allows the device to dissipate about 50% more power than their standard equivalents. power msop-8 thermal characteristics one of the secrets of the mi c5239s performance is its power msop-8 package featuring half the thermal resistance of a standard msop-8 package. lower thermal resistance means more output current or higher input voltage for a given package size. lower thermal resistance is achieved by joining the four ground leads with the die attach paddle to create a single piece electrical and thermal conductor. this concept has been used by mosfet manufacturers for years, proving very reliable and cost effective for the user. thermal resistance consists of two main elements, jc (junction-to-case thermal resistance) and ca (case-to- ambient thermal resistance). see figure 5. jc is the resistance from the die to the leads of the package. ca is the resistance from the leads to the ambient air and it includes cs (case-to-sink thermal resistance) and sa (sink-to-ambient thermal resistance). figure 5. thermal resistance using the power msop-8 reduces the jc dramatically and allows the user to reduce ca . the total thermal resistance, ja (junction-to-ambient thermal resistance) is the limiting factor in calculating the maximum power dissipation capability of the device. typically, the power msop-8 has a jc of 80c/w, this is significantly lower than the standard msop-8 whic h is typically 200c/w. ca is reduced because pins 5 through 8 can now be soldered directly to a ground plane which significantly reduces the case-to-sink ther mal resistance and sink to ambient thermal resistance. low-dropout linear regulators fr om micrel are rated to a maximum junction temperature of 125c. it is important not to exceed this maximum junction temperature during operation of the device. to prevent this maximum junction temperature from being exceeded, the appropriate ground plane h eatsink must be used. 2 figure 6. copper area vs. power-msop power dissipation ( ? t ja ) figure 6 shows copper area versus power dissipation with each trace corresponding to a different temperature rise above ambient. from these curves, the minimum area of copper necessary for the part to operate safely can be determined. the maximum allowable temperature rise must be calculated to determine operation along which curve. downloaded from: http:///
micrel mic5239 december 2007 11 m9999-121007 ? t = t j (max) C t a (max) t j (max) = 125c t a (max) = maximum ambient operating temperature for example, the maximum ambient temperature is 50c, the ? t is determined as follows: ? t = 125c C 50c ? t = 75c using figure 6, the minimum amount of required copper can be determined based on the required power dissipation. power dissipati on in a linear regulator is calculated as follows: p d = (v in C v out ) i out + v in ? i gnd if we use a 3v output device and a 28v input at moderate output current of 25ma, then our power dissipation is as follows: p d = (28v C 3v) 25ma + 28v 250a p d = 625mw + 7mw p d = 632mw from figure 6, the minimum amount of copper required to operate this application at a ? t of 75c is 110mm 2 . quick method determine the power dissipation requirements for the design along with the maximum ambient temperature at which the device will be operated. refer to figure 7, which shows safe operating curves for three different ambient temperatures: 25c, 50c and 85c. from these curves, the minimum amount of copper can be determined by knowing the maximum power dissipation required. if the maximum ambient temperature is 50c and the power dissipation is as above, 639mw, the curve in figure 7 shows that the required area of copper is 110mm 2 . the ja of this package is ideally 80c/w, but it will vary depending upon the availability of copper ground plane to which it is attached. 2 figure 7. copper area vs. power-msop power dissipation (t a ) figure 8. copper area vs. power-soic power dissipation ( ? t ja ) 2 figure 9. copper area vs. power-soic power dissipation (t a ) the same method of determining the heatsink area used for the power msop-8 can be applied directly to the power soic-8. the same two curves showing power dissipation versus copper area are reproduced for the power soic-8 and they can be applied identically. power soic-8 thermal characteristics the power soic-8 package follows the same idea as the power msop-8 package, using four ground leads with the die attach paddle to create a single-piece electrical and thermal conductor, reducing thermal resistance and increasing pow er dissipation capability. quick method determine the power dissipation requirements for the design along with the maximum ambient temperature at which the device will be operated. refer to figure 9, which shows safe operating curves for three different ambient temperatures, 25c, 50c, and 85c. from these curves, the minimum amount of copper can be determined by knowing the maximum power dissipation required. if the maximum ambient temperature is 50c, and the power dissipation is 632mw, the curve in figure 9 shows that the required area of copper is less than 100mm 2 , when using the power soic-8. downloaded from: http:///
micrel mic5239 december 2007 12 m9999-121007 adjustable regulator application figure 10. adjustable voltage application the mic5239ym can be adjusted from 1.24v to 20v by using two external resistors (figure 10). the resistors set the output voltage based on the following equation: ? ? ? ? ? ? + = r2 r1 1 v v ref out where v ref = 1.23v. feedback resistor r2 should be no larger than 300k ? . downloaded from: http:///
micrel mic5239 december 2007 13 m9999-121007 package information 8-pin msop (mm) sot-223 (s) downloaded from: http:///
micrel mic5239 december 2007 14 m9999-121007 8-pin soic (m) 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 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 appliances, devices or systems where malfu nction 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 significan t injury to the user. a purchasers use or sale of micrel produc ts for use in life support app liances, devices or systems is a purchasers own risk and purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 2003 micrel, incorporated. downloaded from: http:///

▲Up To Search▲

Price & Availability of MIC5239-15YS-TR

	To Download MIC5239-15YS-TR Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .