us 79 s e ri es cmos power hall ic 39010us79 rev. 007 page 1 of 9 datasheet apr/12 features and benefits built-in reverse voltage protection built-in rfi filter power efficient cmos and power mosfet drivers allo w 400ma without overheating built-in zener diodes protect outputs eliminate all fan components eliminate pc board 5v and 12v operation high sensitivity for switching symmetry locked rotor shutdown applications fan sizes up to 90mm current range up to 400ma ordering code product code temperature code package code option code packing form code us79 k ua aaa-000 bu legend : temperature code: k for temperature range -40c to 125c package code: ua for to-92(flat) option code: xxx-000: standard versi on packing form: bu for bulk ordering example: us79kua-aaa-000-bu 1. functional diagram 2. description the us79kua is the most advanced smart fan control hall ic. it is designed for 5v and 12v cooling commutation. the chip contains many features to allow survival in a harsh environment. the ic was designed to eliminate all discrete components such as capacitors, resistors, transistors, diodes, pc board and associated labor, replacing us$0.25 to us$0.35 in direct cost. the k rating guarantees proper operation up to an ambient temperature of 125c. hall ic circuitry and power fet output provide a low power dissipation cool chip. locked rotor conditions are detected by the ic when there is no motion for one second and will shut off the motor drive for five seconds. then, the ic will turn on the drive current for one second. this sequence continues indefinitely until the locked rotor condition is fixed. this feature prevents overheating.
39010us79 rev. 007 page 2 of 9 datasheet apr/12 us 79 s e ri es cmos power hall ic table of contents features and benefits ................................................... ................................................... ................ 1 applications....................................... ................................................... .................................................. 1 ordering information........................................ ................................................... .............................. 1 1. functional diagram............................................ ................................................... ....................... 1 2. description........................................ ................................................... ............................................ 1 3. glossary of terms ................................................... ................................................... ................. 3 4. absolute maximum ratings ................................................... ................................................... . 3 5. us79 electrical specifications ................................................... ............................................ 3 6. us79 magnetic specifications..................................... ................................................... ........... 3 7. unique features ................................................... ................................................... ....................... 4 8. performance graphs............................................. ................................................... ................... 4 9. application information ....................................... ................................................... .................. 6 10. standard information regarding manufacturabili ty of melexis products with different soldering processes????????.. ................................................... ................................................... ......... 7 11. esd precautions........................................ ................................................... .................................. 7 12. package information........................................ ................................................... ........................ 8 13. disclaimer ................................................... ................................................... ................................... 9
39010us79 rev. 007 page 3 of 9 datasheet apr/12 us 79 s e ri es cmos power hall ic 3. glossary of terms millitesla (mt), gauss: units of magnetic flux dens ity; 1 millitesla = 10 gauss. two-coil fan: a fan with two coil windings, current alternates from 1 coil to the other depending on t he polarity of the magnetic field. two-wire fan: a fan that has only two connections f or the power supply plus and minus. locked rotor: the condition of a fan that has stopp ed spinning due to mechanical blockage . 4. absolute maximum ratings supply voltage, v dd (-0.3 to 18)v output current (fault), i out 500ma operating temperature range, t a -40 to 125c storage temperature range, t s -55 to 165c maximun junction temp, t j 150c exceeding the absolute maximum ratings may cause pe rmanent damage. exposure to absolute- maximum-rated conditions for extended periods may a ffect device reliability. 5. us79 electrical specifications dc operating parameters: t a = 25 o c, v dd = 12v unless otherwise specified parameter s y m bo l test c ond i t i on s m i n t y p m a x u n i t s supply voltage v dd operating 3.5 - 18 v supply current i dd operating 2.0 4 ma output saturation voltage v dss i out = 150ma 300 600 mv output saturation voltage v dss i out = 350ma 650 1100 mv thermal resistance r th operating 190 o c/w locked-rotor p e r i od t on 0.8 s locked-rotor p e r i od t o ff 5 s 6. us79 magnetic specifications dc operating parameters: t a = 25 o c, v dd = 12v unless otherwise specified. parameter symbol test conditions min typ max units operate point b op operating 2.5 6.0 mt release point b rp operating -6.0 -2.5 mt hysteresis b hys operating 2.0 5.0 - mt
39010us79 rev. 007 page 4 of 9 datasheet apr/12 us 79 s e ri es cmos power hall ic 7. unique features reverse voltage protection eliminates the need for a diode. reverse current flows through the coils an d the chip. power dissipation is (2 * istall/istart * 0.7v). table 1 presents max temperature for each current. reverse voltage protection is provided by the motor windings. the 35v zener diodes clamp the output drivers for o verstress protection. 8. performance graphs
39010us79 rev. 007 page 5 of 9 datasheet apr/12 us 79 s e ri es cmos power hall ic
39010us79 rev. 007 page 7 of 9 datasheet apr/12 us 79 s e ri es cmos power hall ic 9. applications information
39010us79 rev. 007 page 7 of 9 datasheet apr/12 us 79 s e ri es cmos power hall ic 10. standard informationregarding manufacturability of melexis products with different soldering processes our products are classified and qualified regarding soldering technology, solderability and moisture sensitivity level according to following test metho ds: 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 assurance of adhesive strength between device and b oard. 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 t he restriction of the use of certain hazardous substan ces) please visit the quality page on our website: http://www.melexis.com/quality.aspx 11. esd precautions electronic semiconductor products are sensitive to electro static discharge (esd). always observe electro static discharge control pro cedures whenever handling semiconductor products.
39010us79 rev. 007 page 9 of 9 datasheet apr/12 us 79 s e ri es cmos power hall ic 12. package information
39010us79 rev. 007 page 9 of 9 datasheet apr/12 us 79 s e ri es cmos power hall ic 13. disclaimer devices sold by melexis are covered by the warranty and patent indemnification provisions appearing in its term of sale. melexis makes no war ranty, express, statutory, implied, or by description regarding the information set forth her ein or regarding the freedom of the described devices from patent infringement. melexis reserves the right to change specifications and prices at any time and without n otice. therefore, prior to designing this product into a system, it is necessary to check wit h melexis for current information. this product is intended for use in normal commercial ap plications. applications requiring extended temperature range, unusual environmental r equirements, or high reliability applications, such as military, medical life-suppor t or life-sustaining equipment are specifically not recommended without additional pro cessing by melexis for each application. the information furnished by melexis is believed to be correct and accurate. however, melexis shall not be liable to recipient or any thi rd party for any damages, including but not limited to personal injury, property damage, loss o f profits, loss of use, interrupt of business or indirect, special incidental or consequential da mages, of any kind, in connection with or arising out of the furnishing, performance or use o f the technical data herein. no obligation or liability to recipient or any third party shall arise or flow out of melexis? 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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