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mic2003/2013 current limiting circuit prote c tor kickstart i s a trademark of micrel, inc mlf and mi c r o l eadfram e are t r ademarks of am kor technolog y , i n c. micrel inc. ? 2180 fortu ne drive ? san jose, ca 95131 ? usa ? te l +1 (408) 9 44-08 00 ? fax + 1 (408) 474-1000 ? htt p :/ /www.micre l.com general description mic200 3 an d mic201 3 are hig h -side current limiting device s , d e si gned for po wer distri butio n ap plication s in pcs, pda s , printers an d pe riphe ral d e vices. mic200 3 a n d mic20 13 are ther mally p r otecte d a nd will shutd o wn sh ould their inte rnal tempe r at ure re ach un safe levels, p r ote c ting both th e device an d the load, un der high cu rre nt or fault con d i t ions. both d e vice s a r e fu lly self-contai ne d, with the curr ent limit value bein g factory set to one of several co nvenient level s . mic201 3 offers a uni qu e new featu r e: kickstart ? , whi c h all o ws momenta r y high cu rre nt surge s to p a s s unre s tri c ted without sacrific ing ove r all system safety. mic200 3 an d mic2 013 a r e ex cellent choi ce s fo r usb and ieee 1394 (firewi r e) appli c ations or for any syst em whe r e current limiting and power control are de sired. the mi c20 0 3 and mic201 3 a r e offere d in spa c e savi ng 6 pin sot-23 and 2mm x 2mm mlf pa ckag es. data sh eets and su ppo rt documentatio n can be fou n d on micrel? s web site at www.micrel.com. fe ature s ? 70m ? t y pical on- re sist a n c e ? 2.5v - 5.5v operating ra ng e ? pre-set curre n t limit values of 0.5a, 0.8a and 1.2a ? kick st art ? ? thermal prot ection ? und e r voltag e lock-out ? low q u ie scen t current applicati o ns ? usb / ieee 1394 po wer di strib u tion ? de skto p and laptop p c s ? set top boxes ? game con s ol es ? pdas ? printers ? do cki ng stati ons ? c h ar ge rs ___ ___ __ ___ _ ___ ___ __ ___ _ ___ ___ __ ___ _ ___ ___ __ ___ _ ___ ___ __ ___ _ ___ ___ __ ___ _ ___ ___ __ ___ _ ___ ___ __ ___ _ ___ ___ __ _ ty pical a pplic ation f i g u re 1. t y p i cal a p p licatio n circu it o c to be r 20 0 5 m999 9-xxxx04 (408) 95 5-16 9 0
micrel mic20 03/mic20 013 o c to be r 20 0 5 2 m999 9-10 260 5 hb w h el p@micr el.com mic2000 family mem b ers part nu mb er pin f unc tio n normal limiting kickstart i limit i adj. enable c sle w fault / d l m * loa d dischar ge 2 0 0 3 2 0 1 3 - - - - - - - - - - - - 200 4 2 0 1 4 - - - - - - - - 200 5 2 0 1 5 - - - - - - 200 6 2 0 1 6 f i xed -- - - - - 200 7 2 0 1 7 - - - - 200 8 2 0 1 8 - - - - - - 200 9 2 0 1 9 a d j. - - - - - - * dynami c lo ad man agem ent adj = adjusta b le cu rrent limit fixed = fa cto r y prog ram m ed cu rrent lim it ordering inform ation part nu mb er markin g (1 ) cu rren t l i mit kickst art pb -f ree pack ag e mic200 3-0.5y m5 fd 05 0.5a mic200 3-0.8y m5 fd 08 0.8a mic200 3-1.2y m5 fd 12 1.2a sot - 23-5 mic200 3-0.5y ml d0 5 0.5a mic200 3-0.8y ml d0 8 0.8a mic200 3-1.2y ml d1 2 1.2a no 2mmx2mm mlf mic201 3-0.5y m5 fl 05 0.5a mic201 3-0.8y m5 fl 08 0.8a mic201 3-1.2y m5 fl 12 1.2a sot - 23-5 mic201 3-0.5y ml l0 5 0.5a mic201 3-0.8y ml l0 9 0.8a mic201 3-1.2y ml l1 2 1.2a yes yes 2mmx2mm mlf note : 1. under-bar s y mbol ( _ ) ma y n o t be to scale or (40 8 ) 955-1 690
micrel mic20 03/mic20 013 o c to be r 20 0 5 3 m999 9-10 260 5 hb w h el p@micr el.com or (40 8 ) 955-1 690 pin c onfi gur ation n o d a p e d i s k c a b d n u o r g s i v out 1 2 34 5 6 nic nic v in gnd nic 6-l ead 2mmx 2mm ml f (ml) top v i e w nic gnd nic v out v in 3 1 5 2 4 so t 23-5 (m5) top v i e w pin d e s c r i ption pin number sot-2 3 pin number mlf pin name ty pe d e s c r i p t i o n 1 6 v i n i n p u t supp l y inp ut. t h is pin provi d e s po w e r to bot h the outp u t s w itch and the mic200 3/201 3? s interna l contr o l circuitr y . 2 5 g n d - - g r o u n d . 3 4 n i c - - no inter nal co n nectio n . an ele ctrical sign al to this pin w i l l ha ve no effect on device oper atio n. 4 3 n i c - - no inter nal co n nectio n . an ele ctrical sign al to this pin w i l l ha ve no effect on device oper atio n. 2 n i c - - no inter nal co n nectio n . an ele ctrical sign al to this pin w i l l ha ve no effect on device oper atio n. 5 1 vo ut o u t p u t s w itc h outp u t. t he load bei ng driven b y mic 200 3/201 3 is c onn ected to thi s pin.
micrel mic2003/mic20013 october 2005 4 m9999-102605 hbwhelp@micrel.com or (408) 955-1690 absolute maximum ratings (1) v in , v out ............................................................ ?0.3 to 6v all other pins .................................................. ?0.3 to 5.5v power dissipation.................................. in ternally limited continuous output current..................................... 2.25a maximum junction te mperature ........................... 150 c storage temper ature .............................. ?65 c to 150 c operating ratings (2) supply voltage ............................................. 2.5v to 5.5v continuous output current range .................... 0 to 2.1a ambient temperat ure range .................... ?40 c to 85 c package thermal resistance ( ja ) sot-23-5 ............................................. 230c/w mlf 2x2 mm (5) ......................................... 90c/w electrical characteristics v in = 5v, t ambient = 25 c unless specified otherwise. bold indicates ?40c to +85c limits. symbol parameter conditions min typ max units v in switch input voltage 2.5 5.5 v i in internal supply current switch = off, enable = 0v 1 5 a i in internal supply current switch = on, i out = 0 enable = 1.5v 80 300 a i leak output leakage current v in = 5v, v out = 0 v, enable = 0 12 100 a 70 100 m r ds(on) power switch resistance v in = 5v, i out = 100 ma 125 m i limit current limit: ?0.5 v out = 0.8v in to v out = 1v 0.5 0.7 0.9 a i limit current limit: ?0.8 v out = 0.8v in to v out = 1v 0.8 1.1 1.5 a i limit current limit: ?1.2 v out = 0.8v in , to v out = 1v 1.2 1.6 2.1 a i limit_2nd secondary current limit (kickstart) MIC2013, v in = 2.7v 2.2 4 6 a t j increasing 145 ot threshold over-temperature threshold t j decreasing 135 c
micrel mic2003/mic20013 october 2005 5 m9999-102605 hbwhelp@micrel.com or (408) 955-1690 ac characteristics symbol parameter condition min typ max units t limit delay before current limiting secondary current limit (MIC2013) 77 128 192 ms t reset delay before resetting kickstart current limit delay, t limit out of current limit following a current limit. (MIC2013) 77 128 192 ms esd symbol parameter condition min typ max units v out and gnd 4 kv 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: 1. exceeding the absolute maximum rating may damage the device. 2. the device is not guaranteed to f unction outside its operating rating. 3. devices are esd sensitive. handling precautions re commended. human body model, 1.5k in series with 100pf. 4. specification for packaged product only. 5. requires proper thermal mounting to achieve this performance.
micrel mic20 03/mic20 013 o c to be r 20 0 5 6 m999 9-10 260 5 hb w h el p@micr el.com timing di agrams enable vout 50% 90% 10% t on_dl y t off_d l y 50% s w itch ing dela y t i mes 90% 10% 90% 10% t fa l l t rise ris e a nd fa ll time s 90% 10% t rise vout o u t pu t ri se ti me or (40 8 ) 955-1 690
micrel mic20 03/mic20 013 o c to be r 20 0 5 7 m999 9-10 260 5 hb w h el p@micr el.com or (40 8 ) 955-1 690 ty pical characteri stics 0 20 40 60 80 100 23 456 sup p ly cur rent ( a) v in (v ) supp ly cur r ent ou tput ena b led -40 c 85c 25 c 0 0. 1 0 0. 2 0 0. 3 0 0. 4 0 0. 5 0 0. 6 0 0. 7 0 0. 8 0 0. 9 0 1. 0 0 234567 su pply cu rren t ( a) v in (v ) supply c u rrent o u tput disabled -40 c 85 c 25c 0 0. 10 0. 20 0. 30 0. 40 0. 50 0. 60 0. 70 0. 80 0. 90 1. 00 -50 - 3 0 -1 0 1 0 3 0 5 0 7 0 9 0 (a) te m per atu r e ( c ) s w itch le ak age curr ent - off 2 45. 0 2 45. 5 2 46. 0 2 46. 5 2 47. 0 2 47. 5 2 48. 0 -5 0 - 3 0 -1 0 1 0 3 0 5 0 7 0 9 0 thr eshold (mv) te mp er a t ur e (c) uvsd thr es hold v s . temp er ature 1. 25 1. 30 1. 35 1. 40 1. 45 1. 50 1. 55 1. 60 1. 65 - 5 0 - 3 0 - 1 0 1 03 05 0 7 09 0 i li m i t (a) te m per atu r e ( c ) i lim i t vs. te mper ature (mic20 xx -1 .2 ) v in = 2. 5v v in = 5 v v in = 3v 0 0. 2 0. 4 0. 6 0. 8 1. 0 1. 2 1. 4 -50 - 3 0 -1 0 1 0 3 0 5 0 7 0 9 0 i li m i t (a) te m per atu r e ( c ) i lim i t vs . te mp er at ur e 1. 2a 0. 8a 0. 5a 0. 00 0. 20 0. 40 0. 60 0. 80 1. 00 1. 20 1. 40 - 5 0 - 3 0 - 1 0 1 03 05 0 7 09 0 i li m i t (a) te m per atu r e ( c ) 5v 3v 2.5v i lim i t v s . te mp er at u r e (mic20 xx - 0 . 8) no te : p l ease no t e th at th e 3 pl ot s over la y each 0. 55 0. 57 0. 59 0. 61 0. 63 0. 65 0. 67 0. 69 0. 71 0. 73 0. 75 - 5 0 - 3 0 - 1 0 1 03 05 0 7 09 0 i li m i t (a) te m per atu r e ( c ) 5v 3v 2.5v i lim i t vs. te mper ature (mic20 xx - 0 . 5) 0 20 40 60 80 10 0 22 . 533 . 5 4 4 . 555 . 5 r on (m ohm) v in (v ) r on vs . su pply volt a g e 0 20 40 60 80 10 0 12 0 - 5 0 - 3 0 - 1 0 1 03 05 0 7 09 0 r on (m ohm) te m per atu r e ( c ) r on vs . te mp er at ur e 2. 5v 3. 3 v 5v
micrel mic20 03/mic20 013 o c to be r 20 0 5 8 m999 9-10 260 5 hb w h el p@micr el.com or (40 8 ) 955-1 690 functi onal characteristics v out (1v/div) i out (250ma/div) 0 t ime (ms ) 50 100 150 200 250 300 350 400 450 500 550 v in = 5.0v r load c load = 47f current limit response thermal shutdown v out (1v/div) i out (0.5a/div) 0 t ime (ms ) 50 100 150 200 250 300 350 400 450 500 550 kickstart response normal load with t emporary high loa d v out (1v/div) i out (0.5a/div) 0 t ime (ms) 50 100 150 200 250 300 350 400 450 500 550 kickstart response no load to short circuit v out (1v/div) i out (0.5a/div) 0 t ime (ms ) 50 100 150 200 250 300 350 400 450 500 550 kickstart response normal load with t emporary short circuit v out (1v/div) i out (200ma/div) 0 t ime (ms ) 48 1 2 16 20 24 28 32 36 40 0f 10f 22f 47f 100f 220f 470f inrush current response mic20xx-0.5 v out (1v/div) i out (200ma/div) 0 t ime (ms) 24 6 81 0 12 14 v in = 5.0v r load c load = 100nf t urn-on/ t urn-of f
micrel mic20 03/mic20 013 o c to be r 20 0 5 9 m999 9-10 260 5 hb w h el p@micr el.com or (40 8 ) 955-1 690 v out (1v/div) v in (1/div) 0 t ime (s ) 4 8 12 16 20 24 28 32 36 40 44 48 uvlo decreasing v out (1v/div) v in (1/div) 0 t ime (s ) 4 8 12 16 20 24 28 32 36 40 44 48 uvlo increasing v out (1v/div) v in (1/div) 0 t ime (s ) 20 40 60 80 100 120 140 160 180 200 uvsd
micrel mic20 03/mic20 013 o c to be r 20 0 5 10 m999 9-10 260 5 hb w h el p@micr el.com or (40 8 ) 955-1 690 functi onal dia g ra m v f e r r e w o p t e f r e d n u e g a t l o v r o t c e t e d l a m r e h t r o s n e s e t a r w e l s l o r t n o c t n e r r u c t e f r o r r i m y r o t c a f d e t s u j d a t i m i l t n e r r u c p o o l l o r t n o c l o r t n o c e t a g c i g o l l o r t n o c r e m i t y a l e d d n a gnd vout vin f i g u re 2 mic2 003/2 0 1 3 blo ck diag ram
micrel mic20 03/mic20 013 o c to be r 20 0 5 11 m999 9-10 260 5 hb w h el p@micr el.com or (40 8 ) 955-1 690 functi onal de scri p tion input and outpu t v in is both the power sup p ly conn ectio n for the inte rna l circuitry drivi ng the swit ch and the input (sou rce con n e c tion) o f the power mosfet swi t ch. v out is the drai n con n e c tion of the p o we r m o sf et and supp lies power to the load. in a typi ca l circuit, cu rre nt flows f r om v in to v out toward the l oad. since the switch i s bi- dire ctional when e nabl ed, if v out is g r eate r than v in , current will flow from v out to v in . when the switch is di sabl ed, current will not flow to the load, ex cept for a sm all u navoida ble le aka ge cu rren t of a few mi cro a m ps. however, sh ould v out exceed v in by more tha n a diode drop (~0.6v ), whil e the swit ch is disabled, current will flow fr om output to input via the power mosf et?s body di ode. this eff e ct ca n be u s ed to advantage when la rge bypas s capa citors are pla c e d on mic200 3/2013? s? s outp u t. whe n p o w er to the switch is removed, the output capa citor will be automatically discha rge d . if disch argin g c load is required by your a pplication, con s id er u s in g mic200 3/2 013 or mic20 07/201 7 in place of mic2 003/2 013. t h e s e mic 200 0 fam ily membe r s are equip ped wit h a disch a rge fet to i n su re co mpl e te discha rge of c load . curre nt sen s ing and limiting mic200 3/201 3 prote c ts th e system po wer su pply a n d load from da mage by co nti nuou sly m onitorin g cu rrent throug h the on-chip po wer m o sfet. load curren t is monitored by mean s of a curre n t mirror in parallel with the po wer m o sfet switch. cu rrent limiting is invoked whe n the lo ad exce ed s an inte rnally set over-current threshold. when curre n t limiting is a c ti vated the out put curre n t is co nstrai ned to the limit value , and remain s a t this level until eith er th e lo ad /fa u l t is r e mo ve d , th e lo ad ?s curre n t re qui reme nt drop s belo w the li miting value, or the mic200 3/2013 g o e s into thermal shu t down. kicks tar t (mi c 20 13 only ) the mic201 3 is d e si gne d to allo w m o menta r y cu rrent s u rg es ( k icks ta r t ) b e f or e th e on set of cu rrent limiti ng, whi c h pe rmit s dynami c lo ads, such as small di sk d r i v es or p o rtabl e printe rs to d r aw the e n e r gy ne eded to overcome in ertial load s wi thout sa crifici ng sy stem safety. in this respe c t, t he mic2 013 differs m a rke d ly from mi c20 0 3 an d its p e e rs, which i mmediately li mit load cu rrent, potentially starving th e m o tor a nd ca u s ing the applia nce to stall or stu tter. duri ng thi s d e lay pe riod, t y pically 12 8 ms, a se con dary curre n t limit is in effect. if the load dem and s a curre n t in exce ss th e seco nda ry limi t, MIC2013 a c ts im mediat ely to res t ric t out put c u rrent to the s e c o ndary limit for the duratio n of the kicksta r t per iod. after this time the mic201 3 rev e rts to its no rmal cu rre nt limit. an example of kickstart o peratio n is sh own b e lo w. t u o t u o figure 3. kickstart o p er ation picture ke y : a) mic201 3 is enabl ed into an exce ssiv e load (sle w rate limiting not visible at t h is time scal e) the initial curre n t surg e is limite d by either the o v erall circuit resi stan ce a nd p o wer supply compli ance, o r the se con dary cu rre nt limi t, w h ic hever is less . b) r on of the power fet i n crea se s du e to internal heating (effect exaggerate d for empha si s). c) kickstart pe ri od. d) current limiting initia ted. fault/ goe s l o w. e) v out is non -zero (l oad i s h eavy, but not a dead sho r t whe r e v out = 0. limiting response will be the same for dead sho r ts). f) therm a l sh utdown followe d by thermal cyclin g. g) excessive lo ad rel e a s ed, norm a l loa d rem a ins. mic201 3 dro p s out of current limiting. h) fault/ d e la y perio d foll owe d by fa ult/ g o ing hi gh. sle w rate cont rol larg e capa ci tive loads can create si gnifica nt cu rrent surge s when cha r ge d through a hi gh -side swit ch such as the mic2 003/20 13. fo r th is re ason , mic2003/2 013 provide s built -in sle w rate cont rol to limi t the initial inrush curre n ts up on enablin g the power mosf et switch. slew rate co ntrol i s a c tive upon po we ri ng up, and u pon re-ena bling t he loa d . at shutdo wn, the discha rg e sl ew rate i s cont rolled by th e extern al l oad a nd ou tput cap a cit o r.
micrel mic2003/mic20013 october 2005 12 m9999-102605 hbwhelp@micrel.com or (408) 955-1690 thermal shutdown thermal shutdown is employed to protect mic2003/2013 from damage should the die temperature exceed safe operating levels. thermal shutdown shuts off the output mosfet and a sserts the fault/ output if the die temperature reaches 145c. mic2003/2013 will automatic ally resume operation when the die temperature cools down to 135c. if resumed operation results in reheating of the die, another shutdown cycl e will occur and the mic2003/2013 will continue cycling between on and off states until the offending load has been removed. 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.
micrel mic20 03/mic20 013 o c to be r 20 0 5 13 m999 9-10 260 5 hb w h el p@micr el.com or (40 8 ) 955-1 690 applicati on inf o rm ation i lim i t vs . i out measure d mic200 3/201 3?s? s cu rrent li miting circuit r y is desi gne d to act a s a con s tant cu rrent sour ce to the l oad. a s the l oad tries to pull more than the allotted c u rrent, v out drop s and the in pu t to output voltage differe ntial increa ses. whe n v in -v out exce ed s 1v, i out drop s bel ow i li m i t to redu ce the d r ain of fault cu rrent on th e system? s p o w er sup p ly and to limit internal heating of mic20 03/20 13. w h en m e as ur in g i out it is importa nt to bear thi s volta g e depe nden ce in mind, othe rwi s e the m e asu r em ent d a ta may appe ar to indicate a pro b lem when n one re ally exists. this v o ltage dependence is illustrated in figures 4 and 5. in figure 4 o u tput cu rre nt is mea s u r ed as v out is pul led belo w v in , with the test termin ating when v out is 1v belo w v in . observe that on ce i li m i t i s rea c he d i ou t remai n s co nstant throu gho ut the rem a in der of th e te st. in figure 5 this test is repeate d but with v in - v out excee d ing 1v . whe n v in - v out > 1v, mic20 03/20 13? s cu rrent limi t ing circuitry re sp ond s by de creasi ng i out , as can b e see n in figure 5. in this dem on stration, v out is being co ntro lled and i out is the mea s ured qua ntity. in real life appli c ation s v out is dete r mine d in a c cord an ce with ohm?s la w by the load and the limiting cu rre nt. figure 4. i out in c u rrent limiting for v out 1v figure 5. i ou t in current limiting for v out >1v this folding back of i li m i t can be ge neral ized by plottin g i li m i t as a fun c tion of v out , as sho w n bel ow. the slop e of v out betwe en i out = 0 an d i out = i li m i t (wh e r e i li m i t = 1) is dete r min ed by r on of mic200 3/201 3 and i lim it . 0 0.2 0.4 0.6 0.8 1.0 1.2 01 2 3 4 5 6 no rma l i z e d o u tp ut current (a) o u t p u t v o lt ag e (v ) n o rm ali z ed o u tp ut c u rren t vs. o u tp ut vo l t ag e (5v ) figure 6.
micrel mic20 03/mic20 013 o c to be r 20 0 5 14 m999 9-10 260 5 hb w h el p@micr el.com or (40 8 ) 955-1 690 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 c urren t ( a ) o u t p ut vo lta g e ( v ) normal i z e d output curre nt vs . o u tput voltage (2 .5 v ) figure 7. kicks tar t (mi c 20 13) kickstart all o ws bri e f cu rrent su rg es to pass to th e l oad before the onset of no rmal current limiting, which permit s dyna mic loa d s to dra w bu rst s of energy without sa crif ici ng sy st em s a f e t y . functio nally, kickstart i s a force d overri de of th e n o rmal curre n t limiting fun c tion provide d by mic2 013. the kickstart pe ri od is govern ed by an internal timer wh ich allows cu rren t to pa ss uni mpede d to th e loa d for 12 8m s and then no rmal (p rima ry) current li miting goe s into action. duri ng ki ckst art a second ary current limiting ci rcuit is monitori ng o u tput cu rrent to prevent damag e to the mic201 3, a s a ha rd short combi ned wit h a ro bu st po we r sup p ly ca n r e sult in cu rr e n t s of ma ny tens of ampe res. this se con d a r y cu rre nt lim it is nomin all y set at 4 a m ps and rea c ts immediately and inde p ende ntly of the kickstart pe ri od. on ce the kick start time r h a s finished its cou n t the p r i m ary curre n t limiting ci rcuit take s over a nd hold s i out to its programmed limit for a s lo ng as th e ex ce ssiv e lo a d per sist s. once MIC2013 drops out of c u r r e nt limiting the kickstar t timer initiates a lock-o ut p e riod of 128 ms such that no further b u rsts of current ab ove the prim ary cu rrent limit, will be allowed until the lock -out peri od has expired. kickstart ma y be over-ri d den by the therm a l prote c tion circuit a nd if sufficie n t inte rnal heatin g occurs, ki ckstart will be termi nated and i out ? 0. upo n cooli ng, if the load is still present i out ? i li m i t , not i ki ck st art . v out i out 0 t ime (ms) 100 200 300 400 500 600 kickstart current limiting load removed figure 9. kicks tar t supply filtering a 0.1 f to 1 f bypa ss ca pacito r p o siti oned clo s e to the v in and g n d pins of mic2 003/20 13 i s b o th goo d d e si gn pra c tice an d re quired for p r op e r op eratio n of mic2003/2013. thi s will cont rol supply transients and ringin g . witho u t a bypass capa citor, larg e current surge s or an output sh ort may cause sufficie n t rin g ing on v in (from supply l ead indu ctan ce) to cau s e erratic ope rat i on of mic200 3/2013? s control circ uitry. good q uality, low esr capa cit o rs, su ch a s pana soni c? s te or ecj se ri es, are sugg este d. whe n bypa ssing with ca pacito r s of 1 0 f and up, it is good p r a c tice to place a smalle r value cap a cito r in parall e l with the larg er t o han dle the high fre que ncy comp one nts of any line transi ents. val ues in th e ra nge of 0.01 f to 0.1 f are recomme nde d. again, good quality, low esr cap a cito rs sh ould b e chosen. po w e r d i ssipation powe r dissip ation dep end s on several f a ctors su ch a s the load, pcb layout, ambi ent temperature, and sup p l y voltage. cal c ulation of po wer di ssipatio n can b e accompli sh ed by the following equ ation: 2 out ds(on) d i r p u to relate this to junc tion te mper ature, th e followin g equatio n ca n be used: a a) - (j d j t r p t u t
micrel mic20 03/mic20 013 o c to be r 20 0 5 15 m999 9-10 260 5 hb w h el p@micr el.com or (40 8 ) 955-1 690 whe r e: t j = junctio n temp eratu r e, t a = ambient temper ature r (j-a) is the therm a l re sist ance of the packag e in normal op eration mi c2 003/20 13? s ron is low e n o ugh that no sig n ificant i2 r heat i ng o c cur s . device heating is most often ca use d by a sh ort ci rcuit, or very heavy lo ad, whe n a si gni ficant p o rtion of the input su pply volta g e appe ar s a c r o ss mic2 00 3/2013? s po wer mosf et. under these conditions th e heat generated will exceed the package and pcb? s ability to cool the device and thermal limiti ng will be inv o ked. in figure 10 die temper ature is pl otted again s t i out assumin g a con s tant case temper atur e of 85 c. the plots al so assume a wo rst ca se ron of 140 m at a die temper ature of 135c. un der the s e co ndition s it is clea r that an sot-23 packaged devic e will be on the verge of thermal sh utdown, typica lly 140 c di e tempe r atu r e, whe n op erati ng at a l o a d cu rr ent of 1.25a. for this r e as o n w e r e c o mm e n d us in g m l f pa ck ag e d mic200 3/201 3s fo r any desi gn i n ten d ing to sup p ly contin uou s curr ents of 1a or mor e . d i e t e m p er at u r e v s . i o u t f o r t cas e = 85 c 0 20 40 60 80 100 120 140 160 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 i o ut - a m ps d i e t e m p er atu r e - c so t - 2 3 ml f f i g u re 10. die t e mp eratu r e v s . i out whe n op erat ing at hig h e r cu rre nt leve ls o r in hi gh er temper ature environ me nts u s e of micr el?s mlf packa ging is recomme nde d. mlf pa ckage s p r ovide an exposed po wer pad dle on the ba ck side to wh ich electri c al an d ther mal co ntact can be made with the device. t h is signifi cantly r edu ce s the p a ckag e?s th er mal resi stan ce a nd thu s ex tends the mic200 5/201 3? s oper ating r a n ge. 2 v ias 0.3 mm diam. to ground plane 0.8 mm 1.4 mm figure 11. pad for th erm a l mounting to pcb
micrel mic20 03/mic20 013 o c to be r 20 0 5 16 m999 9-10 260 5 hb w h el p@micr el.com or (40 8 ) 955-1 690 package inform ation 0.20 (0.0 0 8 ) 0.09 (0.0 0 4 ) 0. 60 (0 .024) 0. 10 (0 .004) 3.02 (0.119) 2.80 (0.110) 10 0 3. 00 (0 .118) 2. 60 (0 .102) 1.75 (0.069) 1.50 (0.059) 0.95 (0. 0 37) ref 1.30 (0.051) 0.90 (0.035) 0.15 (0.0 06) 0.00 (0.0 00) di me nsions : mm ( i nch ) 0. 50 (0 .020) 0. 35 (0 .014) 1.90 (0. 0 75) re f 5-pin so t - 23 (m5) 6 pin 2 mmx2mm mlf (ml) micrel, inc. 2180 fortune drive san jose, ca 9513 1 usa t e l + 1 (408) 9 44-0 800 f a x + 1 (408) 47 4-1 000 w eb http:/ www . m i crel.co m the information f u rnished b y micrel in this data sh eet is belie ved to be accurate and reliable. ho w e ver, no responsibility is a ssumed by micr el for its use. micrel re serves the right t o change circuitry and specificati ons at an y time w i thout notification to the customer. micrel products are not designed or autho ri zed for use as components in life support app liances, devices or sy stems where malfu nction of a product can reas onabl y be e x pect ed to result in pe rsonal injury . li fe support devices or s y stems are d e vices or sy stem s that (a ) a r e inte nded for surgical implant into the bod y or (b) support o r sustain life, and w h o s e failure to perf o rm can be re asonabl y e x pected to resul t in a significant injury to the use r . a purchaser?s use or sale of micrel products for u s e in life s upport appliances, devices or s y stems is a pu rchaser?s own risk and purchaser a g rees to full y ind e mnif y micrel fo r an y dama ges res u lting from such use or sale. ? 2005 micrel, in corporated.

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