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? 2011 microchip technology inc. ds22281a-page 1 features ? 180 sinusoidal drive, for high efficiency and low acoustic noise ? position sensorless bldc drivers (no hall-effect sensor required) ? integrated power transistors ? supports 2v to 5.5v power supplies ? programming resistor (r prog ) setting to fit motor constant (km) range from 3.25 mv/hz to 52 mv/hz ? direction control: - forward direction: connect dir pin to gnd or leave floating - reverse direction: connect dir pin to v bias or 3v ? speed control through power supply modulation (psm) and/or pulse-width modulation (pwm) ? built-in frequency generator (fg output signal) ? built-in lockup protection and automatic recovery circuit ? built-in overcurrent limitation ? built-in thermal shutdown protection ? built-in over voltage protection ? no external tuning required ? available package 10-lead 3mm x 3mm udfn applications ? notebook cpu cooling fans ? 5v 3-phase bldc motors description the MTD6505 device is a 3-phase full-wave sensorless driver for brushless dc (bldc) motors. it features 180 sinusoidal drive, high torque output and silent drive. with the adaptive features, parameters and wide range of power supplies (2v to 5.5v), the MTD6505 is intended to cover a broad range of motor characteristics, while requiring minimum external components. speed control can be achieved through either power supply modulation (psm) or pulse-width modulation (pwm). the compact packaging and the minimal bill-of- material make the MTD6505 device extremely cost efficient in fan applications. for example, the cpu cooling fans in notebook computers require designs that provide low acoustic noise, low mechanical vibration, and are highly efficient. the frequency generator (fg) output enables precision speed control in closed-loop applications. the MTD6505 device includes lockup protection mode to turn off the output current when the motor is in a lock condition, with an automatic recovery feature to restart the fan when the lock condition is removed. motor overcurrent limitation and thermal shutdown protection are included for safety enhanced operations. the MTD6505 is available in a compact, thermally enhanced, 3mm x 3mm 10-lead udfn package. package types MTD6505 3x3 udfn* v bias r prog out2 fg pwm dir v dd gnd 1 2 3 5 10 9 8 6 out1 out3 4 7 ep 11 *includes exposed thermal pad (ep); see tab l e 3 - 1 . sinusoidal sensorless 3-phase brushless dc fan motor driver MTD6505
MTD6505 ds22281a-page 2 ? 2011 microchip technology inc. functional block diagram thermal protection v bias out1 out2 cpu + peripherals pwm fg out3 v dd short-circuit protection output drive circuit motor phase detection circuit overcurrent protection gnd dir non-volatile memory r prog sense r prog v dd adjustable km
? 2011 microchip technology inc. ds22281a-page 3 MTD6505 typical application recommended external components for typical application element type/value comment c1 > 1 f connect as close as possible to ic input pins. c2 > 1 f connect as close as possible to ic input pins. r1 > 10 k ? connect to vlogic on microcontroller side (fg pull-up). r2 3.9 k ? or 24 k ? select appropriate programming resistor value, see table 4-2: km settings . MTD6505 1 2 3 4 5 10 9 8 7 6 fg v bias out1 out2 gnd out3 v dd dir pwm r2 c1 v dd c2 v dd r1 km0 km3 km1,2 r prog v bias v bias
MTD6505 ds22281a-page 4 ? 2011 microchip technology inc. notes:
? 2011 microchip technology inc. ds22281a-page 5 MTD6505 1.0 electrical characteristics absolute maximum ratings? power supply voltage (v dd_max ) ...................... -0.7 to +7.0v maximum output voltage (v out_max ) ............... -0.7 to +7.0v maximum output current ( 2 ) (i out_max ) ....................1000 ma fg maximum output voltage (v fg_max ) ........... -0.7 to +7.0v fg maximum output current (i fg_max ) ......................5.0 ma v dd maximum voltage (v dd_max ) ..................... -0.7 to +4.0v pwm maximum voltage (v pwm_max ) ................ -0.7 to +7.0v allowable power dissipation ( 1 ) (p d_max ).........................1.5w max junction temperature (t j )................................... +150c esd protection on all pins ???????????????????????????????????????????????????? 2kv ? notice: stresses above those listed under ?maximum ratings? may cause permanent damage to the device. this is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operational listings of this specification is not implied. exposure to maximum rating conditions for extended periods may affect device reliability. note 1: reference pcb, according to jedec standard eia/jesd 51-9. 2: i out is also internally limited, according to the limits defined in the electrical characteristics table. electrical characteristics electrical specifications: unless otherwise specified, all limits are established for v dd = 5.5v to 2.0v, t a = +25c parameters sym min typ max units conditions power supply voltage v dd 2?5.5v power supply current i vdd ?510mav dd =5v standby current i vdd_stb ?3040apwm=0v, v dd =5v (standby mode) out1 high resistance r on(h) ?0.75? ? i out =0.5a, v dd =5v out2 low resistance r on(l) ?0.75? ? i out =0.5a, v dd =5v out3 total resistance r on(h+l) ?1.5? ? i out =0.5a, v dd =5v v bias internal supply voltage v bias ?3?vv dd = 3.2v to 5.5v ?v dd ? 0.2 ? v v dd <3.2v pwm input frequency f pwm 1?100khz pwm input h level v pwm_h 0.55*v dd ?v dd vv dd ? 4.5v pwm input l level v pwm_l 0?0.2*v dd vv dd ? 4.5v pwm internal pull-up resistor r pwm_0 ?266?k ? pwm = 0v pwm internal pull-up resistor r pwm ?133?k ? pwm duty-cycle > 0% dir input h level v dir_h 0.55*v dd ?v dd vv dd ? 4.5v dir input l level v dir_l 0?0.2*v dd vv dd ? 4.5v dir internal pull-down resistor r dir 100 ? 200 k ? fg output pin low level voltage v ol_fg ??0.25vi fg =-1ma fg output pin leakage current i lh_fg -10 ? 10 a v fg =5.5v note 1: 750 ma is the standard option for MTD6505. additional overcurrent protection levels are available upon request. please contact factory for different overcurrent protection values. 2: related to the internal oscillator frequency (see figure 2-1 )
MTD6505 ds22281a-page 6 ? 2011 microchip technology inc. lock protection operating time t run ?0.5? s lock protection waiting time t wait 4.5 5 5.5 s note 2 overcurrent protection i oc_mot ?750?ma overvoltage protection v ov ?7.2?v short protection on high side i oc_sw_h ?2.57? a short protection on low side i oc_sw_l ?-2.83? a thermal shutdown t sd ?170?c thermal shutdown hysteresis t sd_hys ?25?c temperature specifications electrical specifications: unless otherwise specified, all limits are established for v dd = 5.5v to 2.0v, t a = +25c. parameters sym min typ max units conditions temperature ranges operating temperature t opr -40 ? +125 c storage temperature range t stg -55 ? +150 c thermal package resistances thermal resistance, 10l-udfn ? ja ?96.6? c/w electrical characteristics (continued) electrical specifications: unless otherwise specified, all limits are established for v dd = 5.5v to 2.0v, t a = +25c parameters sym min typ max units conditions note 1: 750 ma is the standard option for MTD6505. additional overcurrent protection levels are available upon request. please contact factory for different overcurrent protection values. 2: related to the internal oscillator frequency (see figure 2-1 )
? 2011 microchip technology inc. ds22281a-page 7 MTD6505 2.0 typical performance curves note: unless indicated, t a = +25c, v dd = 5.5v to 2.0v, out1, 2, 3 and pwm open. figure 2-1: oscillator frequency deviation vs. temperature. figure 2-2: internal regulated voltage (v bias ) vs temperature. figure 2-3: internal regulated voltage (v bias ) vs supply voltage (v dd ). figure 2-4: inputs (pwm, dir) v il vs. temperature. figure 2-5: inputs (pwm, dir) v ih vs. temperature. figure 2-6: outputs r on high side resistance vs. temperature. note: the graphs and tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purposes only. the performance characteristics listed herein are not tested or guaranteed. in some graphs or tables, the data presented may be outside the specified operating range (e.g., outside specified power supply range) and therefore outside the warranted range. -3 -2.5 -2 -1.5 -1 -0.5 0 0.5 1 or frequeny deviation (%) v dd = 5.5v v dd = 2v -4.5 -4 -3.5 -3 -2.5 -2 -1.5 -1 -0.5 0 0.5 1 -40 -25 -10 5 20 35 50 65 80 95 110 125 oscillator frequeny deviation (%) temperature (c) v dd = 5.5v v dd = 2v 304 3.06 3.08 3.1 3.12 3.14 v bias (v) 3 3.02 3.04 3.06 3.08 3.1 3.12 3.14 -40 -25 -10 5 20 35 50 65 80 95 110 125 v bias (v) temperature (c) 1 1.5 2 2.5 3 3.5 v bias (v) 0 0.5 1 1.5 2 2.5 3 3.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 v bias (v) v dd (v) 1 1.5 2 2.5 pwm v il (v) vdd = 5.5 vdd = 5.5 v dd = 5.5v v dd = 2v 0 0.5 1 1.5 2 2.5 -40 -25 -10 5 20 35 50 65 80 95 110 125 pwm v il (v) temperature (c) vdd = 5.5 vdd = 5.5 v dd = 5.5v v dd = 2v 1 1.5 2 2.5 3 pwm v ih (v) v dd = 5.5v v dd = 2v 0 0.5 1 1.5 2 2.5 3 -40 -25 -10 5 20 35 50 65 80 95 110 125 pwm v ih (v) temperature (c) v dd = 5.5v v dd = 2v 15 2 2.5 3 3.5 4 4.5 5 5.5 6 r on high side () v dd = 2v 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 -40 -25 -10 5 20 35 50 65 80 95 110 125 ron high side () temperature (c) v dd = 5.5v v dd = 2v
MTD6505 ds22281a-page 8 ? 2011 microchip technology inc. note: unless indicated, t a = +25c, v dd = 5.5v to 2.0v, out1, 2, 3 and pwm open. figure 2-7: outputs r on low side resistance vs. temperature. figure 2-8: supply current vs. temperature. figure 2-9: stand-by current vs. temperature. figure 2-10: pwm pull-up current vs. temperature. 3.0 pin descriptions the descriptions of the pins are listed in tab l e 3 - 1 . 2 2.5 3 3.5 4 4.5 5 5.5 6 o n low side () v dd = 2v 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 -40 -25 -10 5 20 35 50 65 80 95 110 125 ron low side () temperature (c) v dd = 5.5v v dd = 2v 2 3 4 5 6 7 v dd current (ma) v dd = 2v v dd = 5.5v 0 1 2 3 4 5 6 7 -40 -25 -10 5 20 35 50 65 80 95 110 125 i vdd current (ma) temperature (c) v dd = 2v v dd = 5.5v 20 30 40 50 60 d _stb current (a) v dd = 5.5v 0 10 20 30 40 50 60 -40 -25 -10 5 20 35 50 65 80 95 110 125 i vdd_stb current (a) temperature (c) v dd = 5.5v v dd = 2v - 30 -25 -20 -15 -10 -5 0 pull-up current (a) v dd = 2v -40 -35 -30 -25 -20 -15 -10 -5 0 -40 -25 -10 5 20 35 50 65 80 95 110 125 pwm pull-up current (a) temperature (c) v dd = 2v v dd = 5.5v table 3-1: MTD6505 pin function table pin number type name function 1 o fg motor speed indication output 2ir prog km parameter setting with external resistors, see table 4-2 for values 3?v bias internal regulator output (for decoupling only) 4 o out1 single phase coil output pin 5 o out2 single phase coil output pin 6 ? gnd negative voltage supply (ground) 7 o out3 single phase coil output pin 8?v dd positive voltage supply for motor driver 9 i dir motor rotation direction - forward direction: connect pin to gnd or leave floating - reverse direction: connect pin to v bias 10 i pwm pwm input signal for speed control 11 ? ep exposed pad (can be connected to the ground plan for better thermal dissipation) legend: i = input; o = output
? 2011 microchip technology inc. ds22281a-page 9 MTD6505 4.0 functional description the MTD6505 generates a full-wave signal to drive a 3-phase bldc motor. high efficiency and low-power consumption are achieved due to cmos transistors and synchronous rectification drive type. 4.1 speed control the rotational speed of the motor can be controlled either through the pwm digital input signal or by acting directly on the power supply (v dd ). when the pwm signal is high (or left open), the motor rotates at full speed. when the pwm signal is low, the ic outputs are set to high-impedance and the motor is stopped. by changing the pwm duty cycle, the speed can be adjusted. thus, the user has maximum freedom to choose the pwm system frequency within a wide range (from 1khz to 100khz). since the pwm pin has an internal pull-up resistor connected to v dd , it is recommended to drive it between 0v and high-z. the pwm driver must be able to support the pull-up resistor current, in order to drive the pin. see ?pwm internal pull-up resistor? in section 1.0, electrical characteristics . the output transistor activation always occurs at a fixed rate of 30 khz, which is outside of the range of audible frequencies. 4.2 motor rotation direction the current-carrying order of the outputs depends on the dir pin state (?rotation direction?) and is described in tab l e 4 - 1 . the dir pin is not designed for dynamic direction change during operation. 4.3 frequency generator function the frequency generator output (fg) is a ?hall-effect sensor equivalent? digital output, giving information to an external controller about the speed and phase of the motor. the fg pin is an open drain output, connecting to a logical voltage level through an external pull-up resistor. when a lock, or an out-of-sync situation is detected by the driver, this output is set to high- impedance until the motor is restarted. leave the pin open when it is not used. 4.4 lockup protection and automatic restart if the motor is blocked and cannot rotate freely, a lock- up protection circuit detects it and disables the driver by setting its outputs to high-impedance to prevent the motor coil from burnout. after a ?waiting time? (t wait ), the lock-up protection is released and normal operation resumes for a given time (t run ). if the motor is still blocked, a new period of waiting time is started. t wait and t run timings are fixed internally, so that no exter- nal capacitor is required. 4.5 overcurrent protection the motor peak current is limited by the driver to 750 ma (standard value), thus limiting the maximum power dissipation in the coils. 4.6 thermal shutdown the MTD6505 device has a thermal protection function which detects when the die temperature exceeds t j = +170c. when this temperature is reached, the circuit enters the thermal shutdown mode, and the outputs out1, out2 and out3 are disabled (high- impedance), avoiding the ic destruction and allowing the circuit to cool down. when the junction temperature (t j ) drops below +145c, normal operation resumes. the thermal detection circuit has +25c hysteresis. figure 4-1: thermal protection hysteresis. note 1: the pwm frequency has no direct affect on the motor speed and is asynchronous with the activation of the output transistors. note 2: the standard output frequency is 30 khz. a 20 khz output frequency option is available upon request. table 4-1: motor rotation direction options (dir pin) dir pin state rotation direction outputs activation sequence connected to gnd or floating forward out1 ? out2 ? out3 connected to v bias reverse out3 ? out2 ? out1 t j +145 thermal shutdown +170 normal operation
MTD6505 ds22281a-page 10 ? 2011 microchip technology inc. 4.7 internal voltage regulator v bias voltage is generated internally and is used to supply internal logical blocks. the v bias pin is used to connect an external decoupling capacitor (1 f or higher). notice that this pin is for ic internal use, and is not designed to supply dc current to external blocks. 4.8 bemf coefficient setting km is the electro-mechanical coupling coefficient of the motor (also referred to as ?motor constant? or ?bemf constant?). depending on the conventions in use, the exact definition of km and its measurement criteria can vary among motor manufacturers. to accommodate various motor applications, the MTD6505 provides options to facilitate diverse bemf coefficients. the MTD6505 defines bemf coefficient (km) as the peak value of the phase-to-phase bemf voltage, normalized to the electrical speed of the motor. the following table offers methods to set the km value for the MTD6505 device. the r prog sensing is actually a sequence that is con- trolled by the firmware. for any given r prog , the inter- nal control block will output the corresponding km range. table 4-2: km settings km option km (mv/hz) range phase-to-phase r prog min max km0 3.25 6.5 gnd km1 6.5 13 24 k ? km2 13 26 3.9 k ? km3 26 52 v bias
? 2011 microchip technology inc. ds22281a-page 11 MTD6505 5.0 packaging information 5.1 package marking information device code MTD6505t-e/na aaad 10-lead udfn (3x3x0.5 mm) example legend: xx...x customer-specific information y year code (last digit of calendar year) yy year code (last 2 digits of calendar year) ww week code (week of january 1 is week ?01?) nnn alphanumeric traceability code pb-free jedec designator for matte tin (sn) * this package is pb-free. the pb-free jedec designator ( ) can be found on the outer packaging for this package. note : in the event the full microchip part number cannot be marked on one line, it will be carried over to the next line, thus limiting the number of available characters for customer-specific information. 3 e 3 e aaad 1141 256
MTD6505 ds22281a-page 12 ? 2011 microchip technology inc.
? 2011 microchip technology inc. ds22281a-page 13 MTD6505
MTD6505 ds22281a-page 14 ? 2011 microchip technology inc. notes:
? 2011 microchip technology inc. ds22281a-page 15 MTD6505 appendix a: revision history revision a (november 2011) this is the original release of this document.
MTD6505 ds22281a-page 16 ? 2011 microchip technology inc. notes:
? 2011 microchip technology inc. ds22281a-page 17 MTD6505 product identification system to order or obtain information, e. g., on pricing or delivery, refer to the factory or the listed sales office . device: MTD6505t: 3-phase brushless dc, sinusoidal sensorless fan motor driver (tape and reel) temperature range: e = extended -40c to +125c package: na = plastic dual flat, thermally-enhanced, 3x3x0.5 mm body (udfn) examples: a) MTD6505t-e/na tape and reel, extended temperature 10ld udfn package part no. t -x /x x package te mpe rature tape & reel device
MTD6505 ds22281a-page 18 ? 2011 microchip technology inc. notes:
? 2011 microchip technology inc. ds22281a-page 19 information contained in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates. it is your responsibility to ensure that your application meets with your specifications. microchip makes no representations or warranties of any kind whether express or implied, written or oral, statutory or otherwise, related to the information, including but not limited to its condition, quality, performance, merchantability or fitness for purpose . microchip disclaims all liability arising from this information and its use. use of microchip devices in life support and/or safety applications is entirely at the buyer?s risk, and the buyer agrees to defend, indemnify and hold harmless microchip from any and all damages, claims, suits, or expenses resulting from such use. no licenses are conveyed, implicitly or otherwise, under any microchip intellectual property rights. trademarks the microchip name and logo, the microchip logo, dspic, k ee l oq , k ee l oq logo, mplab, pic, picmicro, picstart, pic 32 logo, rfpic and uni/o are registered trademarks of microchip technology incorporated in the u.s.a. and other countries. filterlab, hampshire, hi-tech c, linear active thermistor, mxdev, mxlab, seeval and the embedded control solutions company are registered trademarks of microchip technology incorporated in the u.s.a. analog-for-the-digital age, app lication maestro, chipkit, chipkit logo, codeguard, dspicdem, dspicdem.net, dspicworks, dsspeak, ecan, economonitor, fansense, hi-tide, in-circuit serial programming, icsp, mindi, miwi, mpasm, mplab certified logo, mplib, mplink, mtouch, omniscient code generation, picc, picc-18, picdem, picdem.net, pickit, pictail, real ice, rflab, select mode, total endurance, tsharc, uniwindriver, wiperlock and zena are trademarks of microchip technology incorporated in the u.s.a. and other countries. sqtp is a service mark of microchip technology incorporated in the u.s.a. all other trademarks mentioned herein are property of their respective companies. ? 2011, microchip technology incorporated, printed in the u.s.a., all rights reserved. printed on recycled paper. isbn: 978-1-61341-788-1 note the following details of the code protection feature on microchip devices: ? microchip products meet the specification cont ained in their particular microchip data sheet. ? microchip believes that its family of products is one of the most secure families of its kind on the market today, when used i n the intended manner and under normal conditions. ? there are dishonest and possibly illegal methods used to breach the code protection feature. all of these methods, to our knowledge, require using the microchip produc ts in a manner outside the operating specif ications contained in microchip?s data sheets. most likely, the person doing so is engaged in theft of intellectual property. ? microchip is willing to work with the customer who is concerned about the integrity of their code. ? neither microchip nor any other semiconduc tor manufacturer can guarantee the security of their code. code protection does not mean that we are guaranteeing the product as ?unbreakable.? code protection is constantly evolving. we at microchip are co mmitted to continuously improvin g the code protection features of our products. attempts to break microchip?s code protection feature may be a violation of the digital millennium copyright act. if such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that act. microchip received iso/ts-16949:2009 certification for its worldwide headquarters, design and wafer fabrication facilities in chandler and tempe, arizona; gresham, oregon and design centers in california and india. the company?s quality system processes and procedures are for its pic ? mcus and dspic ? dscs, k ee l oq ? code hopping devices, serial eeproms, microperipherals, nonvolatile memory and analog products. in addition, microchip?s quality system for the design and manufacture of development systems is iso 9001:2000 certified.
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