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mic20xx family fixed and adjustable current limiting power distribution switches kickstart is a trademark of micrel, inc. mlf and micro leadframe are registered trademarks of amkor technology, inc. cablecard is a trademark of cablelabs. protected by u.s. patent no. 7,170,732 micrel inc. 2180 fortune drive san jose, ca 95131 usa tel +1 ( 408 ) 944-0800 fax + 1 (408) 474-1000 http://www.micrel.com general description mic20xx family of switches ar e current limiting, high-side power switches, designed for general purpose power distribution and control in digita l televisions (dtv), printers, set top boxes (stb), pcs, pdas, and other peripheral devices (see functionality table and pin configuration drawings) mic20xx familys primary functions are current limiting and power switching. they are thermally protected and will shutdown should their inter nal temperature reach unsafe levels, protecting both the device and the load, under high- current or fault conditions features include fault reporting, fault blanking to eliminate noise-induced false alarms, output slew rate limiting, under voltage detection, automatic-on output, and enable pin with choice of either active low or active high enable. the fet is self-contained, with a fixed- or user-adjustable current limit. the mic20xx fam ily is ideal for any system where current limiting and power control are desired. the mic201x (3 x 9) and mic2019a switches offer a unique new patented feature: kickstart?, which allows momentary high-current surges up to the secondary current limit (i limit _2nd) without sacrificing overall system safety. the mic20xx family is offered, depending on the desired features, in a space-saving 5-pin sot-23, 6-pin sot-23, and 2mm x 2mm mlf ? packages. datasheets and support documentation can be found on micrels web site at: www.micrel.com . features ? mic20x3 C mic20x9 70m typical on-resistance @ 5v ? mic2005a/20x9a 170m typical on-resistance @ 5v ? enable active high or active low ? 2.5v C 5.5v operating range ? pre-set current limit values of 0.5a, 0.8a, and 1.2a* ? adjustable current limit 0.2a to 2.0a* (mic20x7- mic20x9) ? adjustable current limit 0.1a to 0.9a* (mic20x9a) ? undervoltage lock-out (uvlo) ? variable uvlo allows adjustable uvlo thresholds* ? automatic load discharge for capacitive loads* ? soft-start prevents large current inrush ? adjustable slew rate allows custom slew rates* ? automatic-on output after fault ? thermal protection * available on some family members applications ? digital televisions (dtv) ? set top boxes ? pdas ? printers ? usb / ieee 1394 power distribution ? desktop and laptop pcs ? game consoles ? docking stations ___________________________________________________________________________________________________________ typical application vin vout mic2005a v bus usb port gnd en fault/ 5v supply vin logic controller on/off overcurrent/ 1f 120f figure 1. typical application circuit august 2011 m9999-080211-d downloaded from: http:///
micrel, inc. mic20xx family august 2011 2 m9999-080211-d ordering information mic2003/2013 part number (1) marking (2) current limit kickstart? package mic2003-0.5ym5 fd 05 0.5a mic2003-0.8ym5 fd 08 0.8a mic2003-1.2ym5 fd 12 1.2a 5-pin sot-23 mic2003-0.5yml 50d 0.5a mic2003-0.8yml 80d 0.8a mic2003-1.2yml 21d 1.2a no 6-pin 2mm x 2mm mlf ? mic2013-0.5ym5 fl 05 0.5a mic2013-0.8ym5 fl 08 0.8a mic2013-1.2ym5 fl 12 1.2a 5-pin sot-23 mic2013-0.5yml 50l 0.5a mic2013-0.8yml 90l 0.8a mic2013-1.2yml 21l 1.2a yes 6-pin 2mm x 2mm mlf ? mic2004/2014 part number (1) marking (2) current limit kickstart? package mic2004-0.5ym5 fe 05 0.5a mic2004-0.8ym5 fe 08 0.8a mic2004-1.2ym5 fe 12 1.2a 5-pin sot-23 mic2004-0.5yml 50e 0.5a mic2004-0.8yml 80e 0.8a mic2004-1.2yml 21e 1.2a no 6-pin 2mm x 2mm mlf ? mic2014-0.5ym5 fm 05 0.5a mic2014-0.8ym5 fm 08 0.8a mic2014-1.2ym5 fm 12 1.2a 5-pin sot-23 mic2014-0.5yml 50m 0.5a mic2014-0.8yml 90m 0.8a mic2014-1.2yml 21m 1.2a yes 6-pin 2mm x 2mm mlf ? notes: 1. all mic20xx family parts are rohs-compliant lead free. 2. over/under-bar symbol ( / _ ) may not be to scale. on the package the over/under symbol begins above/below the first chara cter of the marking. downloaded from: http:///
micrel, inc. mic20xx family august 2011 3 m9999-080211-d ordering information (continued) mic2005 part number (1) marking (2) current limit enable kickstart? package mic2005-0.5ym6 ff 05 0.5a active high mic2005-0.8ym6 ff 08 0.8a active high mic2005-1.2ym6 ff 12 1.2a active high 6-pin sot-23 mic2005-0.5yml 50f 0.5a active high mic2005-0.8yml 80f 0.8a active high mic2005-1.2yml 21f 1.2a active high no 6-pin 2mm x 2mm mlf ? mic2005l part number (1) marking (2) current limit enable kickstart? package mic2005-0.5lym5 5l ff 0.5a active low mic2005-0.8lym5 8l ff 0.8a active low mic2005-1.2lym5 4l ff 1.2a active low no 5-pin sot-23 mic2005a part number (1) marking (2) current limit enable kickstart? package mic2005a-1ym5 fa 51 0.5a active high mic2005a-2ym5 fa 52 0.5a active low 5-pin sot-23 mic2005a-1ym6 fa 53 0.5a active high mic2005a-2ym6 fa 54 0.5a active low no 6-pin sot-23 mic2015 part number (1) marking (2) current limit enable kickstart? package mic2015-0.5ym6 fn 05 0.5a active high mic2015-0.8ym6 fn 08 0.8a active high mic2015-1.2ym6 fn 12 1.2a active high 6-pin sot-23 mic2015-0.5yml 50n 0.5a active high mic2015-0.8yml 80n 0.8a active high mic2015-1.2yml 21n 1.2a active high yes 6-pin 2mm x 2mm mlf ? notes: 1. all mic20xx family parts are rohs-compliant lead free. 2. over/under-bar symbol ( / _ ) may not be to scale. on the package the over/under symbol begins above/below the first chara cter of the marking. downloaded from: http:///
micrel, inc. mic20xx family august 2011 4 m9999-080211-d ordering information (continued) mic2006/2016 part number (1) marking (2) current limit kickstart? package mic2006-0.5ym6 fg 05 0.5a mic2006-0.8ym6 fg 08 0.8a mic2006-1.2ym6 fg 12 1.2a 6-pin sot-23 mic2006-0.5yml 50g 0.5a mic2006-0.8yml 80g 0.8a mic2006-1.2yml 21g 1.2a no 6-pin 2mm x 2mm mlf ? mic2016-0.5ym6 fp 05 0.5a mic2016-0.8ym6 fp 08 0.8a mic2016-1.2ym6 fp 12 1.2a 6-pin sot-23 mic2016-0.5yml 50p 0.5a mic2016-0.8yml 90p 0.8a mic2016-1.2yml 21p 1.2a yes 6-pin 2mm x 2mm mlf ? mic2007/2017 part number (1) marking (2) current limit kickstart? package mic2007ym6 fh aa 6-pin sot-23 mic2007yml a ha no 6-pin 2mm x 2mm mlf ? mic2017ym6 fq aa 6-pin sot-23 mic2017yml 0.2a C 2.0a yes 6-pin 2mm x 2mm mlf ? a qa mic2008/2018 part number (1) marking (2) current limit kickstart? package mic2008ym6 fj aa 6-pin sot-23 mic2008yml a ja no 6-pin 2mm x 2mm mlf ? mic2018ym6 fr aa 6-pin sot-23 mic2018yml 0.2a C 2.0a yes 6-pin 2mm x 2mm mlf ? a ra mic2009/2019 part number (1) marking (2) current limit kickstart? package mic2009ym6 fk aa 6-pin sot-23 mic2009yml a ka no 6-pin 2mm x 2mm mlf ? mic2019ym6 fs aa 6-pin sot-23 mic2019yml a sa 0.2a C 2.0a yes 6-pin 2mm x 2mm mlf ? notes: 1. all mic20xx family parts are rohs-compliant lead free. 2. over/under-bar symbol ( / _ ) may not be to scale. on the package the over/under symbol begins above/below the first chara cter of the marking. downloaded from: http:///
micrel, inc. mic20xx family august 2011 5 m9999-080211-d ordering information (continued) mic2009a/2019a part number (1) marking (2) current limit kickstart? enable package mic2009a-1ym6 fk1 active high mic2009a-2ym6 fk2 no active low mic2019a-1ym6 fs1 active high mic2019a-2ym6 fs2 0.1 a C 0.9 a yes active low 6-pin sot-23 notes: 1. all mic20xx family parts are rohs-compliant lead free. 2. over/under-bar symbol ( / _ ) may not be to scale. on the package the over/under symbol begins above/below the first chara cter of the marking. mic20xx family member functionality part number pin function normal limiting kickstart? (1) i limit i limit enable high enable low cslew fault/ vuvlo (5) load discharge 2003 2013 C C C C C C 2004 2014 2005 2015 2005l (1) 2005a-1 (1) (6) 2005a-2 (1) (6) 2006 2016 fixed (2) 2007 2017 2008 2018 2009 2019 2009a-1 2019a-1 2009a-2 2019a-2 adj. (3) notes: 1. kickstart? provides an alternate start-up behavior; however, pin-outs are identical. 2. kickstart? not available. 3. fixed = factory-programmed current limit. 4. adj. = user adjustable current limit. 5. vuvlo = variable uvlo (previously called dml). 6. cslew not available in 5-pin package. downloaded from: http:///
micrel, inc. mic20xx family august 2011 6 m9999-080211-d mic20xx family member pin conf iguration table, sot packages part number pin number normal limiting kickstart? i limit 1 2 3 4 5 6 2003 2013 vin gnd nc nc vout 2004 2014 vin gnd en nc vout 2005 2015 vin gnd en fault/ cslew vout 2005l (1) vin gnd en fault/ vout 2005axxx6 (1) vin gnd en fault/ cslew vout 2005axxx5 (1) vin gnd en fault/ vout 2006 2016 fixed (2) vin gnd en vuvlo (4) cslew vout 2007 2017 vin gnd en ilimit cslew vout 2008 2018 vin gnd en ilimit cslew vout 2009 2019 vin gnd en fault/ ilimit vout 2009a 2019a adj. (3) vin gnd en fault/ ilimit vout notes: 1. kickstart? not available. 2. fixed = factory-programmed current limit. 3. i limit = user adjustable current limit. 4. vuvlo = variable uvlo (previously called dlm). mic20xx family me mber pin configuration table, mlf ? packages (5) part number pin number normal limiting kickstart? i limit 6 5 4 3 2 1 2003 2013 vin gnd nc nc nc vout 2004 2014 vin gnd en nc nc vout 2005 2015 vin gnd en fault/ cslew vout 2006 2016 fixed (2) vin gnd en vuvlo (4) cslew vout 2007 2017 vin gnd en ilimit cslew vout 2008 2018 vin gnd en ilimit cslew vout 2009 2019 adj. (3) vin gnd en fault/ ilimit vout notes: 1. kickstart? not available. 2. fixed = factory-programmed current limit. 3. i limit = user adjustable current limit. 4. vuvlo = variable uvlo (previously called dlm). 5. connect ep to gnd. downloaded from: http:///
micrel, inc. mic20xx family august 2011 7 m9999-080211-d mic20xx family member pin configuration drawings fixed current limit mic20x3 vin 3 1 5 2 4 gnd nc vout nc 5-pin sot-23 (m5) 6-pin mlf ? (ml) (top view) mic20x4 vin 3 1 5 2 4 gnd enable vout nc 5-pin sot-23 (m5) 6-pin mlf ? (ml) (top view) mic20x5 vin 3 1 5 2 4 gnd enable vout fault/ vin 3 1 5 2 gnd enable vout fault/ 6 4 cslew 5-pin sot-23 (m5) mic2005-x.xl 6-pin sot-23 (m6) mic20x5 6-pin mlf ? (ml) (top view) mic20x5 mic20x6 vin 3 1 5 2 gnd enable vout vuvlo 6 4 cslew 6-pin sot-23 (m6) 6-pin mlf ? (ml) (top view) downloaded from: http:///
micrel, inc. mic20xx family august 2011 8 m9999-080211-d mic20xx family member pin configuration drawings (continued) adjustable current limit mic20x7/20x8 vin 3 1 5 2 gnd enable voutilimit 6 4 cslew 6-pin sot-23 (m6) 6-pin mlf ? (ml) (top view) mic20x9 vin 3 1 5 2 gnd enable vout fault/ 6 4 ilimit 6-pin sot-23 (m6) 6-pin mlf ? (ml) (top view) mic2005a vin 3 1 5 2 4 gnd enable vout fault/ vin 3 1 5 2 gnd enable vout fault/ 6 4 cslew 5-pin sot-23 (m5) 6-pin sot-23 (m6) mic2009a vin 3 1 5 2 gnd enable vout fault/ 6 4 ilimit 6-pin sot-23 (m6) downloaded from: http:///
micrel, inc. mic20xx family august 2011 9 m9999-080211-d descriptions these pin and signal descriptions aid in the differentiation of a pin from electrical signals and components connected to that pin. for example, vout is the switchs output pin, while v out is the electrical signal output voltage present at the vout pin. pin descriptions pin name type description vin input supply input. this pin provides power to both the output switch and the switchs internal control circuitry. gnd ground. en input switch enable (input): fault/ output fault status. a logic low on this pin indicates the switch is in current limiting, or has been shut down by the thermal protection circuit. this is an open-drain ou tput allowing logical ori ng of multiple switches. cslew input slew rate control. adding a small value capacitor between this pin and vin slows turn-on of the power fet. vout output switch output. the load being driven by the switch is connected to this pin. vuvlo input variable under voltage lockout (vuvlo): monitors the input voltage through a resistor divider between vin and gnd. shuts the switch off if voltage falls below the threshold set by the resistor divider. previously called vuvlo. ilimit input set current limit threshold via a resistor connected from ilimit to gnd. ep thermal on mlf packages connect ep to gnd. signal descriptions signal name type description v in input electrical signal input voltage present at the vin pin. gnd ground. v en input electrical signal input voltage present at the enable pin. v fault/ output electrical signal output vo ltage present at the fault/ pin. c slew component capacitance value c onnected to the cslew pin. v out output electrical signal output voltage present at the vout pin. v vuvlo_th internal vuvlo internal reference threshold voltage. this voltage is compared to the vuvlo pin input voltage to determine if the switch should be dis abled. reference threshold voltage has a typical value of 250mv. c load component capacitance value connected in parallel with the load. load capacitance. i out output electrical signal output current present at the vout pin. i limit internal switchs curr ent limit. fixed at factory or user adjustable. downloaded from: http:///
micrel, inc. mic20xx family august 2011 10 m9999-080211-d absolute maximum ratings (1) v in , v out .....................................................C0.3v to 6v all other pins ........................................... C0.3v to 5.5v power dissipation (p d ) ..................... internally limited continuous output current all except mic2005a / mic20x9a................. 2.25a mic2005a / 20x9a .......................................... 1.0a maximum junction temperature (t j ) ................ 150 c storage temperature (t s )................. C65c to +150 c lead temperature (sol dering 10 sec)............... 260 c operating ratings (2) supply volt age.............................................. 2.5v to 5.5v continuous output current all except mic2005a / mic20x9a ........... 0a to 2.1a mic2005a/20x9a...................................... 0a to 0.9a ambient temperature range (t a ) ............C40 c to+85 c package thermal resistance (3) sot-23-5/6 ( ja ) .........................................230 c /w 2mm 2mm mlf ? ( ja ) ................................90 c /w 2mm 2mm mlf ? ( jc ) ................................45 c /w electrical characteristics (4) v in = 5v, t a = 25 c unless otherwise specified. bold indicates C40 c to +85 c limits; c in = 1f. symbol parameter condition min. typ. max. units v in switch input voltage 2.5 5.5 v i leak output leakage current (5) switch = off, v out = 0v active low enable, v en = 1.5v active high enable, v en = 0v 12 100 a mic2005a, mic2009a, mic2019a switch = on active low enable, v en = 0v active high enable, v en = 1.5v 80 300 switch = off active low enable, v en = 1.5v 8 15 i in supply current (5) switch = off active high enable, v en = 0v 1 5 a 170 220 r ds(on) power switch resistance v in = 5v, i out = 100ma 275 m ? mic2005a i limit fixed current limit v out = 0.8 v in 0.5 0.7 0.9 a mic2009a, mic2019a i out = 0.9a, v out = 0.8 v in 172 211 263 i out = 0.5a, v out = 0.8 v in 152 206 263 i out = 0.2a, v out = 0.8 v in 138 200 263 c lf variable current limit factors i out = 0.1a, v out = 0.8 v in 121 192 263 v mic2019a i limit_2nd secondary current limit v in = 2.5v, v out = 0v 1 2 3 a notes: 1. exceeding the absolute maximu m rating may damage the device. 2. the device is not guaranteed to function outside its operating rating. 3. requires proper thermal mounting to achieve this performance 4. specifications for packaged product only. 5. check the ordering information section to deter mine which parts are acti ve high or active low. downloaded from: http:///
micrel, inc. mic20xx family august 2011 11 m9999-080211-d electrical characteristics (4) (continued) v in = 5v, t a = 25 c unless otherwise specified. bold indicates C40 c to +85 c limits; c in = 1f. symbol parameter condition min. typ. max. units mic2003-mic2009, mic2013- mic2019, mic2005-x.xl switch = on active low enable, v en = 0v active high enable, v en = 1.5v 80 330 switch = off active low enable, v en = 1.5v 8 15 i in supply current (5) switch = off active high enable, v en = 0v 1 5 a 70 100 r ds(on) power switch resistance v in = 5v, i out = 100ma 125 m ? mic2003-x.x, mic2004-x.x, mic2005-x.x, mic2006-x.x, mi c2013-x.x, mic2014-x.x, mic2015- x.x mic2016-x.x, mic2005-x.xl ? 0.5, v out = 0.8 v in 0.5 0.7 0.9 ? 0.8, v out = 0.8 v in 0.8 1.1 1.5 i limit fixed current limit ? 1.2, v out = 0.8 v in 1.2 1.6 2.1 a mic2005-0.5 i limit fixed current limit v out = 0.8 v in 0.5 0.7 0.9 a mic2007, mic2008, mic2009, mic2017, mic2018, mic2019 i out = 2.0a, v out = 0.8 v in 210 250 286 i out = 1.0a, v out = 0.8 v in 190 243 293 i out = 0.5a, v out = 0.8 v in 168 235 298 c lf variable current limit factors i out = 0.2a, v out = 0.8 v in 144 225 299 v mic2013, mic2014, mic2015, mic 2016, mic2017, mic2018, mic2019 i limit_2nd secondary current limit v in = 2.5v, v out = 0v 2.2 4 6 a mic2006, mic2016 v uvlo_th variable uvlo threshold 225 250 275 mv mic20x4, mic20x7 r dschg load discharge resistance v in = 5v, i sink = 5ma 70 126 200 ? mic20x5, mic20x6, mic20x7, mic20x8 i cslew c slew input current 0v v out 0.8v in 0.175 a downloaded from: http:///
micrel, inc. mic20xx family august 2011 12 m9999-080211-d electrical characteristics (4) (continued) v in = 5v, t a = 25 c unless otherwise specified. bold indicates C40 c to +85 c limits; c in = 1f. symbol parameter condition min. typ. max. units all parts v il (max) 0.5 v en enable input voltage (6) v ih (min) 1.5 v i en enable input current 0v v en 5v 1 5 a v in rising 2 2.25 2.5 uvlo threshold undervoltage lock-out threshold v in falling 1.9 2.15 2.4 v uvlo hysteresis undervoltage lock-out hysteresis 0.1 v v fault fault status output voltage i ol = 10ma 0.25 0.4 v t j increasing 145 ot threshold over-temperature threshold t j decreasing 135 c note: 6. v il(max) = maximum positive voltage applied to the input wh ich will be accepted by the device as a logic low. v ih(max) = maximum positive voltage applied to the input wh ich will be accepted by the device as a logic high. downloaded from: http:///
micrel, inc. mic20xx family august 2011 13 m9999-080211-d ac electrical characteristics symbol parameter condition min. typ. max. units t rise output turn-on rise time r l = 10 ? , c load = 1f, v out = 10% to 90% c slew (7) = open 500 1000 1500 s delay before asserting or releasing fault/ mic2003 C mic2009 mic2009a, mic2005a time from current limiting to fault/ state change 20 32 49 t d_fault delay before asserting or releasing fault/ mic2013 C mic2019 mic2019a time from i out continuously exceeding primary current limit condition to fault/ state change 77 128 192 ms t d_limit delay before current limiting mic2013 C mic2019 mic2019a 77 128 192 ms t reset delay before resetting kickstart? current limit delay, t d _ limit mic2013 C mic2019 mic2019a out of current limit following a current limit event. 77 128 192 ms t on_dly output turn-on delay r l = 43 ? , c l = 120f, v en = 50% to v out = 10% *c slew = open 1000 1500 s t off_dly output turn-off delay r l = 43 ? , c l = 120f, v en = 50% to v out = 90% *c slew = open 700 s esd (8) symbol parameter condition min. typ. max. units v out and gnd 4 v esd_hb electro static discharge voltage: human body model all other pins 2 kv v esd_mchn electro static discharge voltage; machine model all pins machine model 200 v notes: 7. whenever c slew is present. 8. devices are esd sensitive. handli ng precautions recommended. human body mo del, 1.5k in series with 100pf. downloaded from: http:///
micrel, inc. mic20xx family august 2011 14 m9999-080211-d timing diagrams 90% 10% 90% 10% t fall t rise rise and fall times enable vout 50% 90% 10% t on_dly t off_dly 50% switching delay times downloaded from: http:///
micrel, inc. mic20xx family august 2011 15 m9999-080211-d typical characteristics 0 20 40 60 80 100 2.5 3.0 3.5 4.0 4.5 5.0 5.5 supply current (a) v in (v) supply current output enabled mic20xx -40c 85c 25c 0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10 2.5 3.0 3.5 4.0 4.5 5.0 5.5 supply current (a) v in (v) supply current output disabled (mic20xx) -40c 85c 25c 0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10 -40 -15 10 35 60 85 leakage current (a) temperature (c) switch leakage current (mic20xx) 5v 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 -40 -15 10 35 60 85 i limit (a) temperature (c) i limit vs. temperature (mic20xx - 0.5) 5v 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 -40 -15 10 35 60 85 i limit (a) temperature (c) i limit vs. temperature (mic20xx - 0.8) 5v 1.00 1.10 1.20 1.30 1.40 1.50 1.60 1.70 1.80 1.90 2.00 -40 -15 10 35 60 85 i limit (a) temperature (c) i limit vs. temperature (mic20xx - 1.2) 5v 0 20 40 60 80 100 120 140 160 180 200 22.533.544.555.5 r ds(on) (mohm) v in (v) r ds(on) vs. v in (mic20xx) -40c 25c 85c 0 20 40 60 80 100 120 140 160 180 200 -40 -15 10 35 60 85 r ds(on) (mohm) temperature (c) r ds(on) vs. temperature (mic20xx) 2.5v 3.3v 5.0v 0 200 400 600 800 1000 1200 -40 -15 10 35 60 85 current-limit threshold (ma) temperature (c) i limit vs. temperature (mic20x9 - 0.9a) r set = 267ohms 0 20 40 60 80 100 120 140 160 0 0.2 0.4 0.6 0.8 1 1.2 v in C v out (mv) i out (a) v drop vs. temperature (mic20xx-1.2) -40c 25c 85c v in = 5.0v 0 20 40 60 80 100 120 140 160 00.20.40.60.811.2 v in C v out (mv) i out (a) v drop vs. temperature (mic20xx-1.2) -40c 25c 85c v in = 3.3v 0 200 400 600 800 1000 1200 0 0.2 0.4 0.6 0.8 1 1.2 1.4 r set (ohms) i limit (a) r set vs. i limit (mic20x9) r set = 242.62 i limit 0.9538 downloaded from: http:///
micrel, inc. mic20xx family august 2011 16 m9999-080211-d typical characteristics (continued) 0 10 20 30 40 50 60 70 80 90 100 2.533.544.555.5 supply current (a) v in (v) supply current output enabled (mic20xxa) -40c 25c 85c 0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10 2.533.544.555.5 supply current (a) v in (v) supply current output disabled (mic20xxa) -40c 25c 85c 0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10 -40 -15 10 35 60 85 leakage current (a) temperature (c) switch leakage current (mic20xxa) 5v 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 -40 -15 10 35 60 85 i limit (a) temperature (c) i limit vs. temperature (mic20x5a) 5v 0 100 200 300 400 500 600 700 800 900 1000 -40 -15 10 35 60 85 i limit (a) temperature (c) i limit vs. temperature (mic20x9a (0.8a)) r set = 267ohms 0 500 1000 1500 2000 2500 00.20.40.60.81 r set (ohms) i limit (a) r set vs. i limit (mic20x9a) r set = 212.23 i limit 0.9587 0 50 100 150 200 250 2.533.544.555.5 r ds(on) (mohms) v in (v) r ds(on) vs. v in (mic20xxa) -40c 25c 85c 0 50 100 150 200 250 -40 -15 10 35 60 85 r ds(on) (mohms) temperature (c) r ds(on) vs. temperature (mic20xxa) 5.0v 2.5v 3.3v 0 5 10 15 20 25 30 35 40 -40 -15 10 35 60 85 flag delay (ms) temperature (c) flag delay vs. temperature 2.5v 3.3v 5.0v 0 20 40 60 80 100 120 140 160 0 0.1 0.2 0.3 0.4 0.5 0.6 v in - v out (mv) i out (a) v drop vs. temperature (mic20xxa) -40c 25c 85c v in = 5.0v 0 20 40 60 80 100 120 140 160 0 0.1 0.2 0.3 0.4 0.5 0.6 v in - v out (mv) i out (a) v drop vs. temperature (mic20xxa) -40c 25c 85c v in = 3.3v 2.05 2.1 2.15 2.2 2.25 2.3 -50 0 50 100 150 threshold (v) temperature (c) uvlo threshold vs. temperature v rising v falling downloaded from: http:///
micrel, inc. mic20xx family august 2011 17 m9999-080211-d functional characteristics downloaded from: http:///
micrel, inc. mic20xx family august 2011 18 m9999-080211-d functional characteristics (continued) downloaded from: http:///
micrel, inc. mic20xx family august 2011 19 m9999-080211-d functional characteristics (continued) downloaded from: http:///
micrel, inc. mic20xx family august 2011 20 m9999-080211-d functional diagram figure 2. mic20xx family functional diagram downloaded from: http:///
micrel, inc. mic20xx family august 2011 21 m9999-080211-d functional description v in and v out v in is both the power supply connection for the internal circuitry driving the switch and the input (source connection) of the power mosfet switch. v out is the drain connection of the power mosfet and supplies power to the load. in a typical circuit, current flows from v in to v out toward the load. since the switch is bi- directional when enabled, if v out is greater than v in , current will flow from v out to v in . when the switch is disabled, current will not flow to the load, except for a small unavoidable leakage current of a few microamps. however, should v out exceed v in by more than a diode drop (~0.6 v), while the switch is disabled, current will flow from output to input via the power mosfets body diode. if discharging c load is required by your application, consider using mic20x4 or mic20x7; these mic20xx family members are equipped with a discharge fet to insure complete discharge of c load . current sensing and limiting mic20xx protects the system power supply and load from damage by continuously monitoring current through the on-chip power mosfet. load current is monitored by means of a current mirror in parallel with the power mosfet switch. current limiting is invoked when the load exceeds the se t over-current threshold. when current limiting is acti vated the output current is constrained to the limit value, and remains at this level until either the load/fault is removed, the loads current requirement drops below the limiting value, or the switch goes into thermal shutdown. kickstart? 2003 2004 2005x 2006 2007 2008 2009x 2013 2014 2015 2016 2017 2018 2019x only parts in bold have kickstart?. (not available in 5-pin sot-23 packages) the mic201x is designed to allow momentary current surges (kickstart?) before the onset of current limiting, which permits dynamic loads, such as small disk drives or portable printers to draw the energy needed to overcome inertial loads without sacrificing system safety. in this respect, the kickstart? parts (mic201x) differs markedly from the non-kickstart? parts (mic200x) which immediately limit load current, potentially starving the motor and causing the appliance to stall or stutter. during this delay period, typically 128ms, a secondary current limit is in effect. if the load demands a current in excess the secondary limit, mic201x acts immediately to restrict output current to the secondary limit for the duration of the kickstart? period. after this time the mic201x reverts to its normal current limit. an example of kickstart? operation is shown in figure 3. figure 3. kickstart? operation figure 3 label key: a. mic201x is enabled into an excessive load (slew rate limiting not visible at this time scale) the initial current surge is limited by either the overall circuit resistance and power supply compliance, or the secondary current limi t, whichever is less. b. r on of the power fet increases due to internal heating (effect exaggerated for emphasis). c. kickstart? period. d. current limiting initia ted. fault/ goes low. e. v out is non-zero (load is heavy, but not a dead short where v out = 0v. limiting response will be the same for dead shorts). f. thermal shutdown followe d by thermal cycling. g. excessive load released, normal load remains. mic201x drops out of current limiting. h. fault/ delay period followed by fault/ going high. undervoltage lock-out undervoltage lock-out insures no anomalous operation occurs before the devices minimum input voltage of uvlo threshold which is 2v minimum, 2.25v typical, and 2.5v maximum had been achieved. prior to reaching this voltage, t he output switch (power mosfet) is off and no circuit functions, such as fault/ or enable, are considered to be valid or operative. downloaded from: http:///
micrel, inc. mic20xx family august 2011 22 m9999-080211-d variable undervoltage lock out (vuvlo) 2003 2004 2005x 2006 2007 2008 2009x 2013 2014 2015 2016 2017 2018 2019x only parts in bold have vuvlo. v uvlo functions as an input voltage monitor when the switch in enabled. the v in pin is monitored for a drop in voltage, indicating excessive loading of the v in supply. when v in is less than the v ulvo threshold voltage (v vuvlo_th ) for 32ms or more, the mic20xx disables the switch to protect the supply and allow v in to recover. after 128ms has elapsed, the mic20x6 enables switch. this disable and enable cycling will continue as long as v in deceases below the v uvlo threshold voltage (v vuvlo_th ) which has a typical value of 250mv. the v uvlo voltage is commonly established by a voltage divider from v in -to-gnd. enable 2003 2004 2005x 2006 2007 2008 2009x 2013 2014 2015 2016 2017 2018 2019x only parts in bold have enable pin. enable pin is a logic compatible input which activates the main mosfet switch thereby providing power to the v out pin. enable is either an active high or active low control signal. the mic20xx can operate with logic running from supply voltages as low as 1.5 v. enable may be driven higher than v in , but no higher than 5.5v and not less than C0.3v. fault/ 2003 2004 2005x 2006 2007 2008 2009x 2013 2014 2015 2016 2017 2018 2019x only parts in bold have fault/ pin. fault/ is an n-channel open-drain output, which is asserted (low true) when switch either begins current limiting or enters thermal shutdown. fault/ asserts after a brief delay when events occur that may be considered possible faults. this delay insures that fault/ is asserted only upon valid, enduring, over-current conditions and that transitory event error reports are filtered out. in mic200x fault/ asserts after a brief delay period, of 32ms typical. after a fault clears, fault/ remains asserted for the delay period of 32ms mic201xs fault/ asserts at the end of the kickstart? period which is 128ms typical. this masks initial current surges, such as would be seen by a motor load starting up. if the load current remains above the current limit threshold after the kickstar t? has timed out, then the fault/ will be asserted. after a fault clears, fault/ remains asserted for the delay of 128ms. because fault/ is an open-drain it must be pulled high with an external resistor and it may be wire-ord with other similar outputs, sharing a single pull-up resistor. fault/ may be tied to a pull-up voltage source which is higher than v in , but no greater than 5.5v. soft-start control large capacitive loads can create significant inrush current surges when charged through the switch. for this reason, the mic20xx family of switches provides a built-in soft-start control to limit the initial inrush currents. soft-start is accomplished by controlling the power mosfet when the enable pin enables the switch. c slew 2003 2004 2005x 2006 2007 2008 2009x 2013 2014 2015 2016 2017 2018 2019x only parts in bold have cslew pin. (not available in 5-pin sot-23 packages) the c slew pin is provided to increase control of the output voltage ramp at turn-on. this input allows designers the option of decreasing the outputs slew rate (slowing the voltage rise) by adding an external capacitance between the c slew and v in pins. thermal shutdown thermal shutdown is employed to protect the mic20xx family of switches from damage should the die temperature exceed safe operating levels. thermal shutdown shuts off the output mosfet and asserts the fault/ output if the die temperature reaches 145c. the switch will automatically resume operation when the die temperature cools down to 135c. if resumed operation results in reheat ing of the die, another shutdown cycle will occur and the switch will continue cycling between on and off st ates until the overcurrent condition has been resolved. depending on pcb layout, package type, ambient temperature, etc., hundreds of milliseconds may elapse from the incidence of a fault to the output mosfet being shut off. this delay is due to thermal time constants within the system itself. in no event will the device be damaged due to thermal overload because die temperature is monitored continuously by on-chip circuitry. downloaded from: http:///
micrel, inc. mic20xx family august 2011 23 m9999-080211-d application information setting i limit the mic2009/2019s current limit is user programmable and controlled by a resistor connected between the i limit pin and gnd. the value of this resistor is determined by the following equation: set limit r lf) itfactor(c currentlim i = or (a) i lf) itfactor(c currentlim r limit set = for example: set i limit = 1.25a looking in the electrical specifications we will find clf at i limit = 1a. min typ max units 190 243 293 v table 1. clf at i limit = 1a for the sake of this example, we will say the typical value of clf at an i out of 1a is 243v. applying the equation above: = = 4. 194 1.25a 243v )( r set r set = 196 ? (the closest standard 1% value) designers should be aware t hat variations in the measured i limit for a given r set resistor, will occur because of small differences between individual ics (inherent in silicon processing ) resulting in a spread of i limit values. in the example above we used the typical value of clf to calculate r set . we can determine i limit s spread by using the minimum and maximum values of clf and the calculated value of r set . a 97.0 196 190v i limit_min = = 1.5a 196 ? 293v i limit_max = = giving us a maximum i limit variation over temperature of: i limit_min i limit_typ i limit_max 0.97a (-22%) 1.25a 1.5a (+20%) i out r set i limit_min i limit_max 0.1a 1928 ? 0.063a 0.136a 0.2a 993 ? 0.137a 0.265a 0.3a 673 ? 0.216a 0.391a 0.4a 511 ? 0.296a 0.515a 0.5a 413 ? 0.379a 0.637a 0.6a 346 ? 0.463a 0.759a 0.7a 299 ? 0.548a 0.880a 0.8a 263 ? 0.634a 1.001a 0.9a 235 ? 0.722a 1.121a table 2. mic20x9a r set table i out r set i limit_min i limit_max 0.2a 1125 ? 0.127a 0.267a 0.3a 765 ? 0.202a 0.390a 0.4a 582 ? 0.281a 0.510a 0.5a 470 ? 0.361a 0.629a 0.6a 395 ? 0.443a 0.746a 0.7a 341 ? 0.526a 0.861a 0.8a 300 ? 0.610a 0.976a 0.9a 268 ? 0.695a 1.089a 1a 243 ? 0.781a 1.202a 1.1a 222 ? 0.868a 1.314a 1.2a 204 ? 0.956a 1.426a 1.3a 189 ? 1.044a 1.537a 1.4a 176 ? 1.133a 1.647a 1.5a 165 ? 1.222a 1.757a table 3. mic20x9 r set table downloaded from: http:///
micrel, inc. mic20xx family august 2011 24 m9999-080211-d i limit vs. i out measured the mic20xxs current-limiti ng circuitry, during current limiting, is designed to act as a constant current source to the load. as the load tries to pull more than the allotted current, v out drops and the input to output voltage differential increases. when v in - v out exceeds 1v, i out drops below i limit to reduce the drain of fault current on the systems power supply and to limit internal heating of the switch. when measuring i out it is important to bear this voltage dependence in mind, otherwise the measurement data may appear to indicate a problem when none really exists. this voltage dependence is illustrated in figures 4 and 5. in figure 4, output current is measured as v out is pulled below v in , with the test terminating when v out is 1v below v in . observe that once i limit is reached i out remains constant throughout the remainder of the test. in figure 5 this test is repeated but with v in - v out exceeding 1v. when v in - v out > 1v, switchs current limiting circuitry responds by decreasing i out , as can be seen in figure 5. in this demonstration, v out is being controlled and i out is the measured quantity. in real life applications v out is determined in accordance with ? s law by the load and the limiting current. figure 4. i out in current limiting for v in - v out < 1v figure 5. i out in current limiting for v in - v out > 1v this folding back of i limit can be generalized by plotting i limit as a function of v out , as shown below in figures 6 and 7. the slope of v out between i out = 0v and i out = i limit (where i limit = 1a) is determined by r on of the switch and i limit . 0 0.2 0.4 0.6 0.8 1.0 1.2 0123456 normalized output current (a) output voltage (v) normalized output current vs. output voltage (5v) figure 6. normalized output current vs. output voltage downloaded from: http:///
micrel, inc. mic20xx family august 2011 25 m9999-080211-d 0 0.2 0.4 0.6 0.8 1.0 1.2 0 0.5 1.0 1.5 2.0 2.5 3.0 normalized output current (a) output voltage (v) normalized output current vs. output voltage (2.5v) figure 7. normalized output current vs. output voltage c slew 2003 2004 2005x 2006 2007 2008 2009x 2013 2014 2015 2016 2017 2018 2019x only parts in bold have cslew pin. (not available in 5- pin sot-23 packages). the c slew pin is provided to increase control of the output voltage ramp at turn-on. this input allows designers the option of decreasing the outputs slew rate (slowing the voltage rise) by adding an external capacitance between the c slew and v in pins. this capacitance slows the rate at which the pass fet gate voltage increases and thus, slows both the response to an enable command as well as v out s ascent to its final value. figure 8 illustrates effect of c slew on turn-on delay and output rise time. 0 0.002 0.004 0.006 0.008 0.01 0.012 0.014 0000000000 time (ms) c slew (nf) typical turn-on times vs. external c slew capacitance 2 4 6 8 10 12 14 0 0 0.5 1 1.5 2 2.5 3 3.5 44.5 t rise t delay t on figure 8. c slew vs. turn-on, delay and rise times c slew s effect on i limit an unavoidable consequence of adding c slew capacitance is a reduction in the mic20x5 C 20x8s ability to quickly limit current transients or surges. a sufficiently large capacitance can prevent both the primary and secondary current limits from acting in time to prevent damage to the mic20x5 C 20x8 or the system from a short circuit fault. for this reason, the upper limit on the value of c slew is 4nf. variable undervoltage lock out (vuvlo) 2003 2004 2005x 2006 2007 2008 2009x 2013 2014 2015 2016 2017 2018 2019x only parts in bold have vuvlo pin and functionality. power-conscious systems, such as those implementing acpi, will remain active even in their low- power states and may require the support of external devices through both phases of operation. under these conditions, the current allowed these external devices may vary according to the systems operating state and as such require dual current limits on their peripheral ports. the mic20x6 is designed for systems demanding two primary current limiting levels but without the use of a control signal to select between current limits. to better understand how the mic20x6 provides this, imagine a system whose main power supply supports heavy loads during normal operation, but in sleep mode is reduced to only few hundred milliamps of output current. in addition, this system has several usb ports which must remain active during sleep. during normal operation, each port can support a 500ma peripheral, but in sleep mode their combined output current is limited to what the power supply can deliver minus whatever the system itself is drawing. if a peripheral device is plugged in which demands more current than is availabl e, the system power supply will sag, or crash. the mic20x6 prevents this by monitoring both the load current and v in . during normal operation, when the power supply can source plenty of current, the mic20x6 will support any load up to its factory programmed current limit. when the weaker, standby supply is in operat ion, the mic20x6 monitors v in and will shut off its output should v in dip below a predetermined value. this predetermined voltage is user programmable and set by the selection of the resistor divider driving the vuvlo pin. downloaded from: http:///
micrel, inc. mic20xx family august 2011 26 m9999-080211-d to prevent false triggering of the vuvlo feature, the mic20x6 includes a delay timer to blank out momentary excursions below the vuvlo trip point. if v in stays below the vuvlo trip point for longer than 32ms (typical), then the load is disengaged and the mic20x6 will wait 128ms before reapplying power to the load. if v in remains below the vuvlo trip point, then the load will be powered for the 32ms blanking period and then again disengaged. this is illustrated in the scope plot below. if v in remains above the vuvlo trip point mic20x6 resumes normal operation. figure 9. vuvlo operation vuvlo and kickstart? operate independently in the mic2016. if the high-current surge allowed by kickstart? causes v in to dip below the vuvlo trip point for more than 32ms, vuvlo will disengage the load, even though the kickstart? timer has not timed out. vin mic20x6 vout vuvlo input supply r1 r2 + + i in_load figure 10. vuvlo application circuit calculating vuvlo resistor divider values the vuvlo feature is designed to keep the internal switch off until the voltage on the vuvlo pin is greater than 0.25v. a resistor divider network connected to the vuvlo and vin pins is used to set the input trip voltage v trip (see figure 10). the value of r2 is chosen to minimize the load on the input supply i div and the value of r1 sets the trip voltage v trip . the value of r2 is calculated using: div vuvlo i v 2r = the vale of r1 is calculated using: ? ?? ? ? ?? ? ? = 1 v v r2 r1 vuvlo trip where for both equations: v vuvlo = 0.25v when working with large value resistors, a small amount of leakage current from the vuvlo terminal can cause voltage offset s that degrade system accuracy. therefore, the maximum recommended resistor value for r2 is 100k ? . using the divider loading current i div of 100a, the value of r2 can be estimated by: = = k5.2 a 100 v 25.0 2r now the value of r1 can be calculated by: k45 1 v 25.0 v 75.4 k5.2 1r = ?? ? ?? ? ? = where: v trip = 4.75v (for a 5v supply) v vuvlo = 0.25v downloaded from: http:///
micrel, inc. mic20xx family august 2011 27 m9999-080211-d the vuvlo comparator uses no hysteresis. this is because the vuvlo blanking timer prevents any chattering that might otherwise occur if v in varies about the trigger point. the timer is reset by upward crossings of the trip point such that v in must remain below the trip point for the full 32ms period for load disengagement to occur. in selecting a v trip voltage, the designer is cautioned to not make this value less than 2.5v. a minimum of 2.5v is required for the mic20x6s internal circuitry to operate properly. vuvlo trip points below 2.5v will result in erratic or unpredictable operation. kickstart? 2003 2004 2005x 2006 2007 2008 2009x 2013 2014 2015 2016 2017 2018 2019x only parts in bold have kickstart?. (not available in 5- pin sot-23 packages). kickstart? allows brief current surges to pass to the load before the onset of norma l current limiting, which permits dynamic loads to draw bursts of energy without sacrificing system safety. functionally, kickstart? is a forced override of the normal current limiting function provided by the switch. the kickstart? period is governed by an internal timer which allows current to pass up to the secondary current limit (i limit_2nd ) to the load for 128ms and then normal (primary) current limiting goes into action. during kickstart?, a secondary current-limiting circuit is monitoring output current to prevent damage to the switch, as a hard short combined with a robust power supply can result in currents of many tens of amperes. this secondary current limit is nominally set at 4a and reacts immediately and independently of the kickstart? period. once the kickstart? timer has finished its count the primary current limiting circuit takes over and holds i out to its programmed limit for as long as the excessive load persists. once the switch drops out of current limiting the kickstart? timer initiates a lock-out period of 128ms such that no further bursts of current above the primary current limit, will be allowed until the lock-out period has expired. kickstart? may be over-ridden by the thermal protection circuit and if sufficient internal heating occurs, kickstart? will be terminated and i out ? 0a. upon cooling, if the load is still present i out ? i limit , not i limit_2nd . figure 11. kickstart? automatic load discharge 2003 2004 2005x 2006 2007 2008 2009x 2013 2014 2015 2016 2017 2018 2019x only parts in bold have automatic load discharge. automatic discharge is a valuable feature when it is desirable to quickly remove charge from the v out pin. this allows for a quicker pow er-down of the load. this also prevents any charge from being presented to a device being connected to the v out pin, for example, usb, 1394, pcmcia, and cablecard?. automatic discharge is performed by a shunt mosfet from v out pin to gnd. when the switch is disabled, a break before make action is performed turning off the main power mosfet and then enabling the shunt mosfet. the total resistance of the mosfet and internal resistances is typically 126 ? . supply filtering a minimum 1 f bypass capacitor positioned close to the v in and gnd pins of the switch is both good design practice and required for proper operation of the switch. this will control supply transi ents and ringing. without a bypass capacitor, large current surges or a short may cause sufficient ringing on v in (from supply lead inductance) to cause erratic operation of the switchs control circuitry. for best-performance good quality, low-esr capacitors are recommended, preferably ceramic. when bypassing with capacitors of 10 f and up, it is good practice to place a smaller value capacitor in parallel with the larger to handle the high frequency components of any line transients. values in the range of 0.01 f to 0.1 f are recommended. again, good quality, low-esr capacitors should be chosen. downloaded from: http:///
micrel, inc. mic20xx family august 2011 28 m9999-080211-d in figure 12, die temperature is plotted against i out assuming a constant case temperature of 85c. the plots also assume a worst case r on of 140m ? at a die temperature of 135c. under th ese conditions it is clear that an sot-23 packaged device will be on the verge of thermal shutdown, typically 140c die temperature, when operating at a load current of 1.25a. for this reason we recommend using mlf ? packaged switches for any design intending to supply continuous currents of 1a or more. power dissipation power dissipation depends on several factors such as the load, pcb layout, ambient temperature, and supply voltage. calculation of power dissipation can be accomplished by the following equation: 2 ) i( r p out )on(ds d = to relate this to junction temperature, the following equation can be used: 0 20 40 60 80 100 120 140 160 0.2 output current (a) die temperature vs. output current (t case =85c) sot-23 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 mlf a )aj( d j t r p t + = ? where: t j = junction temperature t a = ambient temperature r (j-a) is the thermal resistance of the package in normal operation the switchs r on is low enough that no significant i 2 r heating occurs. device heating is most often caused by a short circuit, or very-heavy load, when a significant portion of the input supply voltage appears across the switchs power mosfet. under these conditions the heat generated will exceed the package and pcbs ability to cool the device and thermal limiting will be invoked. figure 12. die temperature vs. i out downloaded from: http:///
micrel, inc. mic20xx family august 2011 29 m9999-080211-d package information 5-pin sot-23 (m5) 6-pin sot-23 (m6) downloaded from: http:///
micrel, inc. mic20xx family august 2011 30 m9999-080211-d package information (continued) 6 pin 2mm x 2mm mlf ? (ml) section 1.01 micrel, inc. 2180 fortun e 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 this data sheet. this information is not intended as a warranty and micrel does not assume responsibility for it s 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 other wise, to any intellectual property rights is granted by this document. except as provided in micrels terms and conditions of sale for such products, mi crel assumes no liability whatsoever, and micrel disclaims any express or implied warranty relating to the sale and/or use of micrel products including l iability or warranties relating to fitness for a particular purpose, merchantability, or infringement of an y patent, copyright or other intellectual p roperty right. micrel products are not designed or authorized for use as components in life suppor t appliances, devices or systems where malfu nction of a product reasonably be expected to result in pers onal injury. life support devices or system s are devices or systems that (a) are intended for surgical impla 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 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 re sulting from such use or sale. can nt ? 2009 micrel, incorporated. downloaded from: http:///

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