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390 1 00 0 890 rev 003 features and benefits 0 peak output current up to 1200m a 0 low start-up voltage 0 low output resistance 0 high sensitivity integrated hall s en 0 power-efficient cmos and pow er 0 built-in output protection clampi ng 0 locked rotor protection and auto- r 0 integrated tachometer (us890) or signal protected output 0 low cost 0 2-coil fan driver with fg/rd outp ut rohs compliant 4-pin vk pack age ordering code product code temperature code US891 e us890 e legend : temperature code: e for temperature range package code: vk for packing form: bu for bulk ordering example: US891evk 1 functional diagram us 8 9 0 / two-coil fan driver ? high o u p a g e 1 of 12 a en sor er mosfets ng diode r estart or alarm (US891) ut in age application exampl es 0 5v/12v dc brushless m oto 0 pc, server, laptop cooling f 0 power supply cooling fan 0 large and small fan size temperature code package code option code packing form code vk aaa-000 bu vk aaa-000 bu e for temperature range -40c to 85c vk for plastic single in line bu for bulk US891evk -aaa-000-bu 2 general descript io the us890/891 is a one-chip s two-coil brushless dc motors and based on the advanced melex i the ic contains a hall-effect s en offset correction and powerful out 1200ma peak output current c ap specially designed for driving l a device is optimized for low sta r frequency generator or rotat i available. the open-drain o utput connectivity with any external i nte hardware monitoring or super i/o these features are combined w patented no-v dd design to fit t h pin vk package. 0 / us 891 utput current data s h e et apr/12 es oto r/fan fan option code packing form code bu bu io n s olution for driving and fans. i s cmos process, en sor, dynamic out put drivers with ap ability. a rge fans, the r t-up voltage. i on detection is utput makes easier the nterface such as i/o ic. w ith the melexis h e ic in a small 4-
us 8 9 0 / us 891 two-coil fan driver ? high output current 390 1 00 0 890 rev 003 p a g e 2 of 12 data s h e et apr/12 table of contents 1 functional diagram .............................. ................................................... ....................... 1 2 general description ............................. ................................................... ........................ 1 3 glossary of terms ............................... ................................................... ........................ 3 4 absolute maximum ratings ........................ ................................................... ................ 3 5 pin definitions and descriptions ................ ................................................... ................ 3 6 general electrical specifications ............... ................................................... ................ 4 7 magnetic specifications ......................... ................................................... ..................... 4 8 driver output vs magnetic pole .................. ................................................... ................ 4 9 detailed general description .................... ................................................... .................. 5 10 unique features ................................ ................................................... ......................... 5 11 performance graphs ............................. ................................................... .................... 7 11.1 r dson vs t a ................................................... ................................................... ......... 7 11.2 r dson vs v dd ................................................... ................................................... ....... 7 11.3 magnetic parameters vs t a ................................................... .................................... 7 11.4 magnetic parameters vs v dd ................................................... .................................. 7 11.5 i dd vs t a ................................................... ................................................... .............. 7 11.6 i dd vs v dd ................................................... ................................................... ............ 7 12 test conditions ................................ ................................................... .......................... 8 12.1 v dd ? operating ....................................... ................................................... ............... 8 12.2 r dson ................................................... ................................................... .................. 8 12.3 i dd ................................................... ................................................... ....................... 8 12.4 fg/rd output low voltage ..................... ................................................... .............. 8 13 application information......................... ................................................... .................... 9 13.1 typical application circuit .................. ................................................... ..................... 9 13.2 recommended circuit for ground disconnection p rotection....................................... 9 14 application comments ........................... ................................................... ................... 9 15 standard information regarding manufacturability of melexis products with different soldering processes...................... ................................................... ................ 10 16 esd precautions ................................ ................................................... ...................... 10 17 vk package information (4-pin to-92)............ ................................................... ....... 11 18 disclaimer...................................... ................................................... ........................... 12
us 8 9 0 / us 891 two-coil fan driver ? high output current 390 1 00 0 890 rev 003 p a g e 3 of 12 data s h e et apr/12 3 glossary of terms two-coil fan a fan with two-coil windings where cur rent alternates from 1 coil to the other depending on the direction of the magnetic field. millitesla (mt), gauss units of magnetic flux densi ty : 1mt = 10 gauss v dd voltage on the common point of the fan coils. i dd current supplying the chip which flows through the coil connected to the switched off output driver. peak output current the current flowing in the coil at start-up, only limited by the coil resistance r coil and the output driver resistance r dson . continuous output current the average current flowi ng in the coil when the fan is spinning normally. locked rotor the state when the fan stopped spinnin g due to mechanical blockage. fg frequency generator or tachometer output rd rotation detection or alarm output 4 absolute maximum ratings parameter symbol value units fan s upp l y v o l t a g e v dd 18 v peak output cu rr e n t i o ut p 1200 m a con t i nuou s output cu rr e n t i o ut c 600 m a fg/rd p u ll -u p v o l t a g e v fg, r d 18 v fg/rd reverse cu rr e n t i fg_re v , r d _re v 60 m a op e r a t i ng temperature range t a -40 to 85 c j un c t i on temperature t j 125 c storage temperature range t s -55 to 150 c m a gn e t i c f l u x d e n s i ty b u n li m i t e d m t esd s e n s i t i v i ty (aec q100 002 ) - 4 k v table 1: absolute maximum ratings exceeding the absolute maximum ratings may cause pe rmanent damage. exposure to absolute-maximum- rated conditions for extended periods may affect de vice reliability. 5 pin definitions and descriptions pin name pin number function fg ( r d) 1 frequency generator ( ro t a t i on d e t e c t i on ) open dr a i n ou t pu t o ut 1 2 open dr a i n co il dr i v e r 1 o ut 2 3 open dr a i n co il dr i v e r 2 g nd 4 ground p i n table 2: pin definitions and descriptions
us 8 9 0 / us 891 two-coil fan driver ? high output current 390 1 00 0 890 rev 003 p a g e 4 of 12 data s h e et apr/12 a dd a dd 6 general electrical specifications dc operating parameters t = 25 o c, v = 12v (unless otherwise specified) parameter symbol test conditions min typ max unit s fan s upp l y v o l t a g e v dd op e r a t i ng ? r co i l = 100 2.6 ( 1 ) 12 18 v s upp l y cu rr e n t i dd 2.5 4 m a out1, out2 on r e s i s t a n c e r dson 1,2 v dd = 5v, t a = 25c, i out = 300 m a 1 1.4 out1, out2 on r e s i s t a n c e r dson 1,2 v dd = 5v, t j = 125c, i out = 300 m a 1.8 2.5 out1, out2 output c l a m p v o l t a g e v o ut 1,2 36 v fg / rd output low v o l t a g e v o l i ol = 4 m a 0.33 0.5 v fg / rd output c l a m p v o l t a g e v c lm p 18 25 v fg / rd output l ea k a g e cu rr e n t i l e ak v fg (v rd ) = 5 v 0.15 10 a fg / rd output current l i m i t i fg l i m v fg (v rd ) = 12 v 23 m a package t h e r m a l r e s i s t a n c e r th on e - s i d e d pcb, zero l f p m 200 c /w a tt locked rotor p e r i od t o n v dd > 7 v 0.25 s locked rotor p e r i od t off v dd > 7 v 1.5 s locked rotor p e r i od t o n v dd < 5.5 v 0.37 0.53 ( 2 ) 0.75 s locked rotor p e r i od t off v dd < 5.5 v 2.25 3.2 ( 2 ) 4.51 s output s w i t c h i ng d e l a y t d e lay ? d ea d t i m e ? when both d r i v e r s are o ff 50 s table 3: electrical specifications note 1: the minimal value of v dd should be determined using the following equation: v dd =2.5v + r coil * i dd note 2: typical values valid at 5.5v. the values in crease at lower voltage to improve fan start-up rel iability. 7 magnetic specifications dc operating parameters t = 25 o c, v = 12v (unless otherwise specified) parameter symbol test conditions min typ max units operate po i n t b o p 0 6 m t r e l ea s e po i n t b r p - 6 0 m t hy s t e r e s i s b h y s t 2 4.5 10 m t table 4: magnetic specifications 8 driver output vs magnetic pole parameter test conditions out1 out2 fg north po l e b < brp h i gh l o w h i gh south po l e b > b op l o w h i gh l o w table 5: driver output vs magnetic pole note 1: the magnetic pole is applied facing the bra nded side of the package
390 1 00 0 890 rev 003 9 detailed general d esc the us890/891 is a one-chip soluti on melexis cmos process, the chip c ont drivers with 1200ma peak output curr ent the low side output coil drivers are fu ll not needed to cut the high voltage spi k the us890 has an open-drain integr a in the US891, the open-drain rotation goes high when the flux switching fr equen 10 unique features specially designed for driving large f an voltage. at low v dd , fans typically tak e the motor start-up phase (from zero to inertia may have slow start-up causi ng longer than the lrp t on period, the f an the us890/891 provides an adequ ate period at low voltage. it directly impro v us 8 9 0 / two-coil fan driver ? high o u p a g e 5 of 12 esc ription on for driving two-coil brushless dc motors and fans. ont ains a hall-effect sensor, dynamic offset correctio n ent capability. ll y protected against switching transients. so an ex te k es induced by the motor coils. a ted tachometer fg output that follows the hall sign a detection output rd is active low during normal spi nn equen cy becomes too low, which means the motor is b an s, both ics have lrp characteristics optimised for l e longer to start up than at higher v dd . to maximum rotation speed) is illustrated below. bi g ng a longer first output pulse after power-on. if thi s p an may falsely enter locked rotor condition. ate and simple solution to prevent this by automatical l y v es the motor start-up reliability. 0 / us 891 utput current data s h e et apr/12 based on advanced and powerful output te rnal zener diode is a l. nn ing of the motor. it b locked. l ow start-up g fans with large p ulse duration is y adjusting the lrp
390 1 00 0 890 rev 003 according to the electrical specificati on ? v dd < 5.5v, t on /t off time per i the periods increase with o pe ? v dd > 7v, t on /t off time peri ods the periods at high voltage a r ? 5.5v < v dd < 7v, the switchi ng a small hysteresis is imple men the typical mean threshold bet this facilitates driving heavier fans and increased or decreased depending on the the fg/rd output driver provides an while switched on. it can occur if a too this protection reduces the risk of e o us 8 9 0 / two-coil fan driver ? high o u p a g e 6 of 12 on table and the figure above, three behaviours can o i ods are longer (from 0.53s / 3.2s typical at 5.5v) pe rating voltage to improve start-up at very low volt ag e ods are shorter (0.25s / 1.5s typical) r e about twice as short as at low voltage ng event may slightly vary, but is kept within these li m men ted to avoid oscillation around the threshold volta g e. bet ween the hysteresis is around 6.1v (t a =25 c). and motors with large inertia without any external com pon on the fan supply voltage v dd ). over current protection limiting the current flowin g in too small pull-up resistor is used or if this resistor is s ho o s damage on the fg/rd driver. 0 / us 891 utput current data s h e et apr/12 o ccur: e . m its. e. pon ent (t on /t off is the fg/rd driver ho rt connected.
us 8 9 0 / us 891 two-coil fan driver ? high output current 390 1 00 0 890 rev 003 p a g e 7 of 12 data s h e et apr/12 idd (ma) magnetic field (mt) rdson (ohms) idd (ma) magnetic field (mt) rdson (ohms) 11 performance graphs 11.1 r dson vs t a 11.2 r dson vs v dd 2.5 2 1.5 vdd = 2.5v vdd = 5v vdd = 18v 2.5 2 1.5 ta = -40 c ta = 25 c ta = 85 c ta = 105 c ta = 125 c 1 1 0.5 0.5 0 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 ta ( c) 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 vdd (volts) 11.3 magnetic parameters vs t a 11.4 magnetic parameters vs v dd 6 6 3 3 bop, vdd=2.5v bop, vdd=18v brp, vdd=2.5v brp, vdd=18v 0 bhyst, vdd=2.5v bhyst, vdd=18v bop, ta=25 c brp, ta=25 c 0 bhyst, ta=25 c -3 -3 -6 -40 -30 -20 -10 0 10 2 0 30 40 50 60 70 80 90 100 110 120 ta ( c) -6 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 vdd (volts) 11.5 i dd vs t a 11.6 i dd vs v dd 4 4 vdd = 2.5v vdd = 5v 3 vdd = 12v 3 vdd = 18v 2 2 ta = -40 c 1 1 ta = 25 c ta = 85 c ta = 105 c ta = 125 c 0 -40 -30 -20 -10 0 10 2 0 30 40 50 60 70 80 90 100 110 120 ta ( c) 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 vdd (volts)
390 1 00 0 890 rev 003 12 test conditions 12.1 v dd ? operating 12.3 i dd us 8 9 0 / two-coil fan driver ? high o u p a g e 8 of 12 12.2 r dson 12.4 fg/rd output low v ol 0 / us 891 utput current data s h e et apr/12 ol tage
390 1 00 0 890 rev 003 13 application informat i 13.1 typical application cir c 14 application comme n the application 13.1 shows the typic al protection. without this diode, the rev e limited by its coil resistances. in som e may be acceptable by both ic and co i affect the reliability or damage each of them the diode d1 connected in series bet we this reverse current to flow. it preven ts the application 13.2 is given in case t this moment, the current flowing thro ugh fg/rd output driver in reverse directi on. a bypass capacitor connected betwe en damage occurring by providing a clos e the value of the capacitor needs to b e higher capacitor value. for 2-wire fan application (tachom eter connected to the device ground pin ( #4 us 8 9 0 / two-coil fan driver ? high o u p a g e 9 of 12 i on c uit 13.2 recommended circuit f disconnection protection n ts al application including a diode d1 for additional re ve rs e rse current in each coil is equal to the fan peak c u rr e fan construction where the peak current is not so bi g, i ls for short period of time. however, a long exposu r e of them by overheating. we en the supply voltage and the common point of the ts such reverse voltage damage and best protects bo t he ground connection might be disconnected while the ugh the coils may circulate from the output (out1 or on. high reverse current may damage the logic ou tput en the coil common node and the device ground sho u e path to this current. e tuned with the motor characteristics. higher induc tan eter or alarm logical output not required), the fg/rd p i n #4 ). 0 / us 891 utput current data s h e et apr/12 f or ground rs e voltage rr ent, as it is only g, this situation e may seriously of the coils prevents bo th ic and coils. the fan operates. at out2) to the tput driver. u ld prevent such tan ce may require n (#1) should be
us 8 9 0 / us 891 two-coil fan driver ? high output current 390 1 00 0 890 rev 003 p a g e 10 of 12 data s h e et apr/12 15 standard information regarding manufacturability of melexis products with different soldering processes our products are classified and qualified regarding soldering technology, solderability and moisture s ensitivity level according to following test methods: reflow soldering smd?s (s urface m ount d evices) ? ipc/jedec j-std-020 moisture/reflow sensitivity classification for nonh ermetic solid state surface mount devices (classification reflow profiles according to table 5-2) ? eia/jedec jesd22-a113 preconditioning of nonhermetic surface mount device s prior to reliability testing (reflow profiles according to table 2) wave soldering smd?s (s urface m ount d evices) and thd?s (t hrough h ole d evices) ? en60749-20 resistance of plastic- encapsulated smd?s to combin ed effect of moisture and soldering heat ? eia/jedec jesd22-b106 and en60749-15 resistance to soldering temperature for through-hol e mounted devices iron soldering thd?s (t hrough h ole d evices) ? en60749-15 resistance to soldering temperature for through-hol e mounted devices solderability smd?s (s urface m ount d evices) and thd?s (t hrough h ole d evices) ? eia/jedec jesd22-b102 and en60749-21 solderability for all soldering technologies deviating from above mentioned standard conditions (regarding peak temperature, temperature gradient, temperature prof ile etc) additional classification and qualificatio n tests have to be agreed upon with melexis. the application of wave soldering for smd?s is allo wed only after consulting melexis regarding assuran ce of adhesive strength between device and board. melexis is contributing to global environmental con servation by promoting lead free solutions. for more information on qualifications of rohs compliant products (rohs = european directive on th e restriction of the use of certain hazardous substances) please vis it the quality page on our website: http://www.melexis.com/quality.aspx 16 esd precautions electronic semiconductor products are sensitive to electro static discharge (esd). always observe electro static discharge control pro cedures whenever handling semiconductor products.
390 1 00 0 890 rev 003 0. 4 6 5 e.d.m process s u r f a ce r o1.6 ~ 2.4u m 1.42 + /- 0.10 1.3 3.65 + /- 0.10 2.5 m i n see note 3 10.50 + /- 0.30 17 vk package infor mat 5.22 + /- 0.10 4.20 + /- 0.10 1.55 + /- 0.10 0.73 + /- 0.10 3 +2 (2x) 0.00 0.20 + 0.02 - 0.03 1.27 + /- 0.03 + 2 - 1 ( 2 x ) 3.81 + /- 0.03 0.38 + /- 0.03 0.30 + /- 0.10 ( 2 x ) 3 +2 ( 2 x ) 1.9 us 8 9 0 / two-coil fan driver ? high o u p a g e 11 of 12 - 1 mat ion (4-pin to-92) 5 +2 (2x) notes: 1. all d i m e n si on s are in m illi m e t e r s 2. package d i m e n si on exclude m o l d i ng f l a mold f l a sh sh a ll not exceed 0.127 mm . 3. to preserve r e li a b ili t y, it i s recommend e have t o t a l l ea d l e ng t h e qu a l to 2.5 mm m i n i m u m , measured from the package l 4. vk package i s a pin t hough - ho l e p a cka g hence adapted for wave so l d e r i ng p r o c e a r e f l o w so l d e r i ng process i s no t recommended with vk package as it m s e r i ou sl y a ff e ct d e v i ce r e li a b ili t y. 0.38 + /- 0.03 m a rk i ng : 1 st l i n e : us890 (US891) - name of the d e 2 nd l i n e : xxy ww xx - l o t number ( l a st 2 d i g i t s) y - a sse m b l y year ( l a st d i g i t) ww - a s se m b l y week nu m b e r hall plate l o ca t i on 0.52 n o t e s: 1. all d i m e n si on s are in m illi m e t e r s 0 / us 891 utput current data s h e et apr/12 a sh . e d t o li n e . g e , e ss. m a y e vi ce
us 8 9 0 / us 891 two-coil fan driver ? high output current 390 1 00 0 890 rev 003 p a g e 12 of 12 data s h e et apr/12 18 disclaimer devices sold by melexis are covered by the warranty and patent indemnification provisions appearing in its term of sale. melexis makes no warranty, express, s tatutory, implied, or by description regarding the information set forth herein or regarding the freed om of the described devices from patent infringemen t. melexis reserves the right to change specifications and prices at any time and without notice. therefo re, prior to designing this product into a system, it is nece ssary to check with melexis for current information . this product is intended for use in normal commercial ap plications. applications requiring extended tempera ture range, unusual environmental requirements, or high reliability applications, such as military, medical life- support or life-sustaining equipment are specifical ly not recommended without additional processing by melexis for each application. the information furnished by melexis is believed to be correct and accurate. however, melexis shall no t be liable to recipient or any third party for any dama ges, including but not limited to personal injury, property damage, loss of profits, loss of use, interrupt of business or indirect, special incidental or consequ ential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the t echnical data herein. no obligation or liability to recipien t or any third party shall arise or flow out of mel exis rendering of technical or other services. ? 2012 melexis nv. all rights reserved. for the latest version of this document, go to our website at www.melexis.com or for additional information contact melexis direc t: europe, africa, asia: america: phone: +32 1367 0495 phone: +1 248 306 5400 e-mail: sales_europe@melexis.com e-mail: sales_usa @melexis.com iso/ts 16949 and iso14001 certified

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