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mic2039 high - accuracy, high - side, adjustable current limit power switch micrel inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? tel +1 (408) 944 - 0800 ? fax + 1 (408) 474 - 1000 ? http://www.micrel.com june 7, 2013 revision 1.1 general description the mic2039 is a high - side mosfet power distribution switch providing increased system reliability by u s ing 5% current - limit accuracy. the mic2039 has an operating input voltage range from 2.5v to 5.5v, is internally current limited , an d has thermal shutdown to protect the device and system. the mic2039 is offered with either active - high or active - low logic level enable input controls . it has an open drain fault status output flag with a built - in 32ms delay that asserts low during overcu rrent or thermal - shutdown conditions. the mic2039 switches feature an adjustable output current limit that is resistor programmable from 0.2a to 2 . 5 a. the mic2039 switch also offer s a unique, kickstart feature that allows momentary high - current surges up t o the secondary current limit (i limit_2nd ) during startup or while operating in steady state . this is useful for charging loads with high inrush currents, such as capacitors. after an overcurrent condition is established , these switche s enter into a consta nt current - limit mode unless the die temperature exceeds the thermal - shutdown specification. the mic2039 i s available in 6 - p in sot - 23 and 6 - p in 2 mm 2 mm thin dfn packages. the mic2039 has an operating junction temperature range of ? 40 c to + 12 5 c. data sheets and support documentation are available on micrel?s web site at: www.micrel.com . features ? 5% c urrent limit accuracy ? input supply range from 2.5v to 5.5v ? low quiescent current : 100a typical (switch on) ? 75m? typical r ds(on) at 5.0v ? 0.2a to 2.5a adjustable output current ? kickstart ? momentary secondary current - limit threshold (120ms period ) ? soft - start functionality ? undervoltage lockout (uvlo) ? fast 10 s short - circuit response time (non - kickstart options) ? fault status output flag ? logic - controlled enable (active - high, active - low) ? thermal shutdown ? pin compatible with the mic2009/mic2019 ? 6 - pin 2mm 2mm thin dfn and 6 - pin sot - 23 packages ? junction temperature range from ? 40 c to + 125 c applications ? usb peripherals and usb 2.0/ 3.0 c ompatible ? dtv/stb ? notebooks and consumer electronics ? general - purpose power distribution _______________________________ _____________________________________________________________________________ typical application
micrel, inc. mic2039 june 7, 2013 2 revision 1.1 ordering information part number top mark ( 1 ) current limit enable kickstart package mic2039aym6 39a a adjustable active high n o sot -23-6l mic2039bym6 39b b adjustable active low no sot -23-6l mic2039aymt 3a9 adjustable active high no 6 - pin 2mm x 2mm t hin dfn ( 2 ) MIC2039BYMT b39 adjustable active low no 6 - pin 2mm x 2mm thin dfn (2) mic2039eym6 39a e adj ustable active high yes sot -23-6l mic2039fym6 39a f adjustable active low yes sot -23-6l mic2039eymt d39 adjustable active high yes 6 - pin 2mm x 2mm thin dfn ( 2 ) mic2039fymt f39 adjustable active low yes 6 - pin 2mm x 2mm thin dfn (2) notes: 1. under - bar symbol ( _ ) may not be to scale. 2. thin dfn is a green rohs - compliant package. lead finish is nipdau. mold compound is halogen free. pin configuration vin fault/ ilimit vout gnd 4 5 6 1 2 3 en vin fault/ ilimit vout gnd ep en 6 1 2 3 5 4 sot -23 6 - lead (m6 ) top view 2mm x 2 mm 6 -pin thin dfn (mt ) ( 3 ) top view notes: 3. thin dfn = pin 1 identifier.
micrel, inc. mic2039 june 7, 2013 3 revision 1.1 pin description pin number pin name pin function sot -23-6l 6 - pin 2mmx2 mm thin dfn 1 6 vin input: power s wi tch and logic supply input . 2 5 gnd ground: input and output return pin. 3 4 en enable (input) : logic compatible, enable control input that allows switch turn - on/off. do not leave the en pin floating. 4 3 fault/ fault status flag (output): active -lo w, o pen- drain output. a logic low state indicates an overcurrent or thermal shutdown condition. an overcurrent condition must last longer than t fa ult/ to assert fault/. a pull - up resistor (10k recommended) to an external supply is required. 5 2 ilimit current limit set : current limit adjust setting. connect a resistor from this pin to gnd to set the current limit , but do not leave the ilimit pin floating. 6 1 v out switch output : power sw itch output. ? ep e pad exposed pad: exposed pad on bottom of package. connect to el ectrical ground for optimum thermal dissipation .
micrel, inc. mic2039 june 7, 2013 4 revision 1.1 absolute maximum ratings ( 4 ) v in to gnd ....................................................... ? 0.3v to + 6 v v out to gnd .................................................... ? 0.3v to +6v v ilimit t o gnd .................................................. ? 0.3v to + 6v v enable to gnd ................................................ ? 0.3v to + 6 v v fault/ to gnd ................................................. ? 0.3v to + 6 v fault/ current (i f ault/ ) .............................................. 25ma maximum power dissipation (p d ) ............. internally limited lead temperature (soldering, 10 s ) ............................ 260c storage temperature (t s ) ......................... ? 65c to +150 c esd rating ( 6) hbm ......................................................................... 3 kv mm ......................................................................... 3 00v operating ratings ( 5 ) supply voltage (v in ) ..................................... +2 . 5 v to +5 . 5 v v en , v fault/ ................................................... ? 0.3v to +5.5 v v ilimit , v out ........................................................ ? 0.3v to v in junction temperature (t j ) ........................ ? 40c to +125c package thermal resistance sot - 23- 6 ( ja ) .............................................. 177.2 c/w 6 - pin 2 mm 2 mm dfn ( ja ) ............................. 9 0c/w electrical characteristics ( 7 ) v in = v en = 5 v; c in = 1 f; c out = 1 f t j = 25c. bold values indicate ? 40c t j +125c, unless noted otherwise . symbol parameter condition mi n. typ. max. units power supply input v in input voltage range 2.5 5.5 v v uvlo input supply undervoltage lockout threshold v in rising 2.0 2.25 2.5 v v in falling 1.9 2.15 2.4 v uvlohys input supply undervoltage lockout threshold hysteresis v in ris ing or v in falling 100 mv i dd supply current switch off (i out = 0a) active -h igh enable (a): v en = 0v, v in = 5 v 0.75 5 a active -l ow enable (b): v en = v in = 5 v switch on (i out = 0a) active -h igh enable (a): v en = 1.5v, v in = 5v 100 300 active -l ow enable (b): v en = 0v, v in = 5v power mosfet r ds ( on ) switch on resistance v in = 2.5v, i out = 350ma 100 177 m v in = 3.3v, i out = 350ma 85 145 v in = 5v, i out = 350ma 75 125 i lkg output leakage current switch off, v out = 0v 0.2 2 15 a notes: 4. exceeding the absolute maximum rating may damage the device. 5. the device is not guaranteed to function properly outside its operating rating. 6. devices are esd sensitive. handling precautions recommended. human body model (hbm), 1.5k ? in serie s with 100pf. 7. specification for packaged product only.
micrel, inc. mic2039 june 7, 2013 5 revision 1.1 electrical characteristics ( 7 ) (continued) v in = v en = 5v; c in = 1 f; c out = 1 f t j = 25c. bold values indicate ? 40c t j +125c, unless noted otherwise. symbol parameter conditio n min. typ. max. units current limit i limit current limit (resistor values are standard 0.1% values) r limit = 11 5 ?, v in = 5v , v out = 0.8 v v in 2. 35 2.5 2.6 5 a r limit = 115 ?, v in = 2. 5v , v out = 0v v in 2.6 2.85 3.1 r limit = 14 5 ?, v in = 5v , v out = 0.8 v v in 1.9 0 2.0 2.1 0 r limit = 28 7 ?, v in = 5v , v out = 0.8 v v in 0.9 5 1.0 1.0 5 r limit = 5 76 ?, v in = 5v , v out = 0.8 v v in 0.4 7 5 0.50 0.5 2 5 r limit = 1.4 5 k ?, v in = 5v , v out = 0.8 v v in 0.19 0.20 0.2 1 i limit_2nd secondary current limit ( kic kstart parts only) v out = 0v 2.2 3.2 6 a symbol parameter condition min. typ. max. units i/o v en enable voltage logic low 0.5 v logic high 1.5 i en enable input current 0v v en 5v 1 a r f ault/ fault/ output resistance i out = 10ma 25 i fault/_off fault/ off current v f ault/ = v in 10 a thermal protection t sd thermal - shutdown t hreshold t j r ising 157 c t sdhys thermal - shutdown hysteresis 15 c timing specifications (ac parameters) t rise output turn - on rise time ( 8 ) r load = 10 ; c out = 1 f 700 s t fall output turn - off fall time ( 8 ) v en = off; r load = 10 ; c out = 1 f 32 s t on_dly output turn - on delay ( 8 ) r load = 10 ; c out = 1 f 700 s t off_dly output turn - off delay ( 8 ) r load = 10 ; c out = 1 f 5 s t sc_resp short circuit response time ( 8 ) v out = 0v (short circuit) 10 s t fault/ overcurrent fault response delay time ( 8 ) non - kickstart parts 16 32 49 ms t kickstart overcurrent fault response delay during kickstart ( 8 ) kickstart parts only 64 120 200 ms note : 8. see ? timing diagrams ? (figures 1 through 4 ) .
micrel, inc. mic2039 june 7, 2013 6 revision 1.1 timing diagrams 0 0 t rise t fall t v 10% 10% 90% 90% vout en figure 1. output rise/fall time 0 0 t on _ dly t off_dly t v 10% 50% 50% 90% vout en figure 2. turn - on/off del ay
micrel, inc. mic2039 june 7, 2013 7 revision 1.1 timing diagrams (continued) iout fault / 0 0 t sc_resp t fault/ t v vout 0 i limit figure 3. short circuit response time and over c urrent fault flag delay (non - kickstart ) iout fault/ 0 0 t kickstart t v vout 0 i limit figure 4. over c urrent fault flag delay ( kickstart )
micrel, inc. mic2039 june 7, 2013 8 revision 1.1 typical characterist ics input supply current vs. temperature 0 25 50 75 100 125 150 175 200 -50 -25 0 25 50 75 100 125 temperature (c) supply current (a) v in = 5v i ou t = 0ma vin off current vs. temperature 0.00 0.25 0.50 0.75 1.00 1.25 1.50 -50 -25 0 25 50 75 100 125 temperature (c) supply off current (a) v in = 5v v en = off i ou t = 0ma undervoltage lockout vs. temperature 1.50 1.75 2.00 2.25 2.50 -50 -25 0 25 50 75 100 125 temperature (c) uvlo threshold (v) v in falling v in rising r ds(on) vs. temperature 0 25 50 75 100 125 -50 -25 0 25 50 75 100 125 temperature (c) r ds(on) (m) v in = 5v i out = 350ma r ds(on) vs. output current 0 25 50 75 100 125 0.0 0.5 1.0 1.5 2.0 2.5 output current (a) r ds(on) (m) v in = 5v t a = 25c r ds(on) vs. output current 0 25 50 75 100 125 0.0 0.5 1.0 1.5 2.0 2.5 output current (a) r ds(on) (m) v in = 3.3v t a = 25c 0 10 20 30 40 50 -50 -25 0 25 50 75 100 125 fault/ response time (ms) temperature ( c) fault/ response time vs. temperature v in = 5v i limit = 1a non - kickstart 0 50 100 150 200 250 -50 -25 0 25 50 75 100 125 fault/ response time (ms) temperature ( c) fault/ response time vs. temperature v in = 5v i limit = 1a kickstart 0 50 100 150 200 250 0.0 0.5 1.0 1.5 2.0 2.5 fault/ response time (ms) output current (a) fault/ response time vs. output current v in = 5v t a = 25 c kickstart
micrel, inc. mic2039 june 7, 2013 9 revision 1.1 typical characteristics (cont inued ) output leakage current vs. temperature 0 1 2 3 4 5 -50 -25 0 25 50 75 100 125 temperature (c) output leakage (a) v in = 5v v en = off i ou t = 0ma vin - vout vs. output current 0 50 100 150 200 250 0.0 0.5 1.0 1.5 2.0 2.5 output current (a) vin - vout (mv) v in = 5v t a = 25c current limit set resistor vs. output current 0 250 500 750 1000 1250 1500 0.0 0.5 1.0 1.5 2.0 2.5 output current (a) r set () v in = 5v t a = 25c
micrel, inc. mic2039 june 7, 2013 10 revision 1.1 functional characteristics
micrel, inc. mic2039 june 7, 2013 11 revision 1.1 function al characteristics (continued)
micrel, inc. mic2039 june 7, 2013 12 revision 1.1 functional characteristics (conti nued)
micrel, inc. mic2039 june 7, 2013 13 revision 1.1 functional diagram thermal sensor en gnd vout vin control reference current limit delay uvlo ilimit sense fet power fet fault/ figur e 5 . mic 2039 block diagram
micrel, inc. mic2039 june 7, 2013 14 revision 1.1 functional description the mic2039 is a high - side mosfet power - distribution switch that provides increased system reliability by u s ing 5% current limit accuracy. the mic2039 is internally current limited and has thermal shutdown , which protects the device and system . th e mic2 039 has a soft - start circuit that minimizes in - rush current by slowing the t urn - on time. additionally, the mic2039 has an optional kickstart feature , which momentarily overrides the normal current - li miting function to allow higher inrush and/or transient currents. soft - start soft - start reduces the power - supply input surge current at startup by controlling the output voltage rise time. the input surge appears while the output capacitor is charged up. a slower output rise time draw s a lower input surge current. kickstart inrush over c urrent filter the mic2039eyxx and mic2039fyxx are equipped with a secondary current limit that allows high inrush current transient s to pass for a set period before the primary current - limit circuitry becomes active. the fault / status flag does not assert during the kickstart period (typically 120ms), wh ich eliminates any false ( fault/ ) assertions . the kickstart function is active during initial startup or while operating in steady state. input capacitor micrel recommends a 1 f to 10 f ceramic input capacitor f or most applications. place t he input ca pacitor on the same side of the board and next to the mic2039 to minimize the voltage ringing during transient and short - circuit conditions. using two vias for each end of the capacitor to connect to the power and ground plane is also recommended . micrel r ecommends x7r or x5r dielectric ceramic capacitors because of their temperature performance. x7r - type capacitors change capacitance by 15% over their operating temperature range and are the most stable type of ceramic capacitors. z5u and y5v dielectric cap acitors change value by as much as 50% and 60% , respectively , over their operating temperature ranges. to use a ceramic chip capacitor with y5v dielectric, the value must be much higher than an x7r ceramic or a tantalum capacitor to ensure the same capacit ance value over the operating temperature range . output capacitor the output capacitor type and placement criteria are the same as for the input capaci tor. see the ? input capacitor ? section for a detailed description . enable the mic2039 offers either an active - high or active - low enable input (en) that allows on/off control of the switch output. the current through the device reduces to near ?zero? when the device is shut down, with only microamperes of leakage current. the en input can be directly tied to v in or driven by a voltage that is equal to or less than v in ; do not leave this pin floating. adjustable current limit the m ic2039 current limi t is adjustable from 0.2a to 2. 5a by connecting a resistor from the ilimit pin to gnd. the following equation d etermines the resistor : limit i / 289 limit r ? eq. 1 w here i limit is the typical current limit from the electrical table . if the output current exceeds the set current limit, the mic2039 switch enter s constant current limit mode. the maximum allowable c urrent limit can be less than the full specified and/or expected current if the mic2039 is not mounted on a circuit board with sufficiently low thermal resistance. table 1 shows r esistor values (1%) for select current limit settings. i limit 0.2a 0.5a 1.0a 2a 2. 5 a r limit 1.4 5 k 5 7 6 287 145 1 15 table 1. resistor selection for adjustable current limit
micrel, inc. mic2039 june 7, 2013 15 revision 1.1 thermal design to help reduce the thermal resistance, the epad (underneath the ic) should be soldered to the pcb ground. the placement of thermal vias e ither underneath or near the epad is highly recommended. thermal design requires the following application - speci?c parameters: ? maximum ambient temperature (t a ) ? output current (i out ) ? input voltage (v in ) ? current l imit (i limit ) when the mic2039 is in constan t current limit mode, it may exceed the overtemperature threshold. if this occurs, the overtemperature condition will shut down the mic2039 switch and the fault status flag will go active (assert low). after the switch cools down, it automatically turn s on again. t he user can maximize t he mic2039 power dissipation by either lowering the thermal resistance on the exposed pad (only the dfn package has an exposed pad) on the printed circuit board, or by limiting the maximum allowable ambient temperature. th erm al measurements it is always wise to measure the ic?s case temperature to make sure that it is within its operating limits. although this might seem like a n elementary task, it is very easy to get false results. the most common mistake is to use the standa rd thermal couple that comes with the thermal voltage meter. this thermal couple wire gauge is large, typically 22 gauge, and behaves like a heatsink, resulting in a lower case measurement. there are two suggested methods for measuring the ic case temperat ure: a thermal couple or an infrared thermometer. if a thermal couple is used, it must be constructed of 36 gauge wire or higher to minimize the wire heatsinking effect. in addition, the thermal couple tip must be covered in either thermal grease or therma l glue to make sure that the thermal couple junction is making good contact to the case of the ic. thermal couple 5sc - tt - k - 36- 36 from omega is adequate for most applications. to avoid using messy thermal couple grease or glue, an infrared thermometer is recommended. most i nfrared thermometers? spot size is too large for an accurate reading on small form factor ics. however, an ir thermometer from optris has a 1mm spot size, which makes it ide al for the 2 mm 2 mm thin dfn package. also, get the optional stand. the stand makes it easy to hold the beam on the ic for long periods of time.
micrel, inc. mic2039 june 7, 2013 16 revision 1.1 evaluation board schematic bill of materials item part number manufacturer description qty. c1, c2 c1608x5r0j105k tdk ( 9 ) 1 f/6.3v ceramic capacitor, x5r, 0603 2 06036d105kat2a avx ( 10 ) r1, r2 crcw060310k0fkea vishay/dale ( 11 ) 10k, film resistor, 0603, 1% 2 r3 crcw06032870fkea vishay/dale 287 film resistor, 0603, 1% 1 u1 mic2039xymt micrel ( 12 ) high - accuracy, high- side , adjustable current - limit power switch 1 notes: 9. tdk: www.tdk.com . 10. avx.: www.avx.com . 11. vishay: www.vishay.com . 12. micrel, in c.: www.micrel.com
micrel, inc. mic2039 june 7, 2013 17 revision 1.1 pcb layout (mic203 9 xymt evaluation board) mic203 9 xymt evaluation board ? top layer mic2039 xymt evaluation board ? bottom layer
micrel, inc. mic2039 june 7, 2013 18 revision 1.1 pcb layout (mic203 9 x ym6 evaluation board) mic203 9 xym 6 evalua tion board ? top layer mic203 9 xym 6 evaluation board ? bottom layer
micrel, inc. mic2039 june 7, 2013 19 revision 1.1 package information ( 13) 6 - pin 2mm x 2mm thin dfn (mt) note: 13. package information is correct as of the publication date. for updates and most curre nt information, go to www.micrel.com .
micrel, inc. mic2039 june 7, 2013 20 revision 1.1 package information (13) (continued) so t23 -6l (m 6 )
micrel, inc. mic2039 june 7, 2013 21 revision 1.1 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 makes no representations or warranties with respect to the accuracy or completeness of the information furnished in th is 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 time 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 micrel?s terms and conditions of sale for such products, micrel assumes no liability whatsoever, and micrel disclaims any express or implied warranty relating to the sale and/or use of micrel products includ ing liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right micrel products are not designed or authorized for use as components in life support a ppliances, 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 significant 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 a nd purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 2012 micrel, incorporated.

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