MTD6505

MTD6505 Sinusoidal Sensorless 3-Phase Brushless DC Fan Motor Driver 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 (RPROG) 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 VBIAS 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 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-ofmaterial 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* FG 1 RPROG 2 VBIAS 3 OUT1 4 OUT2 5 EP 11 10 PWM 9 DIR 8 VDD 7 OUT3 6 GND Applications • Notebook CPU Cooling Fans • 5V 3-Phase BLDC Motors *Includes Exposed Thermal Pad (EP); see Table 3-1.  2011 Microchip Technology Inc. DS22281A-page 1 MTD6505 Functional Block Diagram VBIAS FG VDD VDD CPU + peripherals Output Drive Circuit OUT3 OUT2 OUT1 PWM DIR GND Non-volatile memory RPROG Adjustable Km Thermal protection Overcurrent protection Short-circuit protection Motor Phase Detection Circuit RPROG sense DS22281A-page 2  2011 Microchip Technology Inc. MTD6505 Typical Application Km0 Km1,2 Km3 VBIAS VBIAS R2 VDD R1 FG RPROG VBIAS 1 10 PWM DIR VDD OUT3 GND C1 MTD6505 2 3 4 5 9 8 7 6 VDD C2 OUT1 OUT2 Recommended External Components for Typical Application Element C1 C2 R1 R2 Type/Value >1 µF >1 µF >10 kΩ 3.9 kΩ or 24 kΩ Comment Connect as close as possible to IC input pins. Connect as close as possible to IC input pins. Connect to Vlogic on microcontroller side (FG Pull-Up). Select appropriate programming resistor value, see Table 4-2: Km Settings.  2011 Microchip Technology Inc. DS22281A-page 3 MTD6505 NOTES: DS22281A-page 4  2011 Microchip Technology Inc. MTD6505 1.0 ELECTRICAL CHARACTERISTICS † 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 standard EIA/JESD 51-9. to JEDEC Absolute Maximum Ratings† Power Supply Voltage (VDD_MAX) ...................... -0.7 to +7.0V Maximum Output Current(2) (IOUT_MAX) ....................1000 mA FG Maximum Output Voltage (VFG_MAX) ........... -0.7 to +7.0V FG Maximum Output Current (IFG_MAX) ......................5.0 mA VDD Maximum Voltage (VDD_MAX) ..................... -0.7 to +4.0V PWM Maximum Voltage (VPWM_MAX) ................ -0.7 to +7.0V Allowable Power Dissipation(1)(PD_MAX).........................1.5W Max Junction Temperature (TJ)................................... +150°C ESD protection on all pins 2 kV Maximum Output Voltage (VOUT_MAX) ............... -0.7 to +7.0V 2: IOUT 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 VDD = 5.5V to 2.0V, TA = +25°C Parameters Power Supply Voltage Power Supply Current Standby Current OUT1 High Resistance OUT2 Low Resistance OUT3 Total Resistance VBIAS Internal Supply Voltage PWM Input Frequency PWM Input H Level PWM Input L Level PWM Internal Pull-Up Resistor PWM Internal Pull-Up Resistor DIR Input H Level DIR Input L Level DIR Internal Pull-Down Resistor FG Output Pin Low Level Voltage FG Output Pin Leakage Current Note 1: 2: Sym VDD IVDD IVDD_STB RON(H) RON(L) RON(H+L) VBIAS fPWM VPWM_H VPWM_L RPWM_0 RPWM VDIR_H VDIR_L RDIR VOL_FG ILH_FG Min 2 — — — — — — — 1 0.55*VDD 0 — — 0.55*VDD 0 100 — -10 Typ — 5 30 0.75 0.75 1.5 3 VDD – 0.2 — — — 266 133 — — — — — Max 5.5 10 40 — — — — — 100 VDD 0.2*VDD — — VDD 0.2*VDD 200 0.25 10 Units V mA µA Ω Ω Ω V V kHz V V kΩ kΩ V V kΩ V µA IFG = -1 mA VFG = 5.5V VDD  4.5V VDD  4.5V PWM = 0V PWM duty-cycle > 0% VDD  4.5V VDD  4.5V VDD = 5V PWM = 0V, VDD = 5V (Standby mode) IOUT = 0.5A, VDD = 5V IOUT = 0.5A, VDD = 5V IOUT = 0.5A, VDD = 5V VDD = 3.2V to 5.5V VDD < 3.2V Conditions 750 mA is the standard option for MTD6505. Additional overcurrent protection levels are available upon request. Please contact factory for different overcurrent protection values. Related to the internal oscillator frequency (see Figure 2-1)  2011 Microchip Technology Inc. DS22281A-page 5 MTD6505 ELECTRICAL CHARACTERISTICS (CONTINUED) Electrical Specifications: Unless otherwise specified, all limits are established for VDD = 5.5V to 2.0V, TA = +25°C Parameters Lock Protection Operating Time Lock Protection Waiting Time Overcurrent Protection Overvoltage Protection Short Protection on High Side Short Protection on Low Side Thermal Shutdown Thermal Shutdown Hysteresis Note 1: 2: Sym TRUN TWAIT IOC_MOT VOV IOC_SW_H IOC_SW_L TSD TSD_HYS Min — 4.5 — — — — — — Typ 0.5 5 750 7.2 2.57 -2.83 170 25 Max — 5.5 — — — — — — Units s s mA V A A °C °C Note 2 Conditions 750 mA is the standard option for MTD6505. Additional overcurrent protection levels are available upon request. Please contact factory for different overcurrent protection values. Related to the internal oscillator frequency (see Figure 2-1) TEMPERATURE SPECIFICATIONS Electrical Specifications: Unless otherwise specified, all limits are established for VDD = 5.5V to 2.0V, TA = +25°C. Parameters Temperature Ranges Operating Temperature Storage Temperature Range Thermal Package Resistances Thermal Resistance, 10L-UDFN JA — 96.6 — °C/W TOPR TSTG -40 -55 — — +125 +150 °C °C Sym Min Typ Max Units Conditions DS22281A-page 6  2011 Microchip Technology Inc. MTD6505 2.0 Note: TYPICAL PERFORMANCE CURVES 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. Note: Unless indicated, TA = +25°C, VDD = 5.5V to 2.0V, OUT1, 2, 3 and PWM open. Oscillator Frequeny Deviation or (%) 1 0.5 0 -0.5 -1 -1.5 -2 -2.5 -3 -3.5 -4 -4.5 2.5 VDD = 5.5V VDD = 2V VDD = 5.5V VDD = 5.5 2 PWM VIL (V) 1.5 1 VDD = 2V 0.5 0 -40 -25 -10 5 20 35 50 65 80 95 110 125 -40 -25 -10 5 20 35 50 65 80 95 110 125 Temperature (C°) Temperature (C°) FIGURE 2-1: Oscillator Frequency Deviation vs. Temperature. 3.14 3.12 FIGURE 2-4: Temperature. 3 2.5 Inputs (PWM, DIR) VIL vs. VDD = 5.5V 3.08 3.06 3 04 3.04 3.02 3 -40 -25 -10 5 20 35 50 65 80 95 110 125 Temperature (C°) PWM VIH (V) 3.1 VBIAS (V) 2 1.5 1 0.5 0 -40 -25 -10 5 20 35 50 65 80 95 110 125 Temperature (C°) VDD = 2V FIGURE 2-2: Internal Regulated Voltage (VBIAS) vs Temperature. 3.5 3 2.5 FIGURE 2-5: Temperature. 6 5.5 5 4.5 4 3.5 3 2.5 2 15 1.5 1 0.5 0 Inputs (PWM, DIR) VIH vs. 2 1.5 1 0.5 0 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 VDD(V) RON RON High Side ( ) VDD = 2V VBIAS (V) VDD = 5.5V -40 -25 -10 5 20 35 50 65 80 95 110 125 Temperature (C°) FIGURE 2-3: Internal Regulated Voltage (VBIAS) vs Supply Voltage (VDD). FIGURE 2-6: Outputs RON High Side Resistance vs. Temperature.  2011 Microchip Technology Inc. DS22281A-page 7 MTD6505 Note: Unless indicated, TA = +25°C, VDD = 5.5V to 2.0V, OUT1, 2, 3 and PWM open. 6 5.5 5 4.5 4 3.5 3 2.5 2 1.5 1 0.5 0 60 IVDD_STB Current (μA) D_STB 50 40 30 20 10 0 -40 -25 -10 5 20 35 50 65 80 95 110 125 Temperature (C°) VDD = 2V VDD = 5.5V RON Low Side ( ) ON VDD = 2V VDD = 5.5V -40 -25 -10 5 20 35 50 65 80 95 110 125 Temperature (C°) FIGURE 2-7: Outputs RON Low Side Resistance vs. Temperature. 7 FIGURE 2-9: Temperature. 0 Stand-By Current vs. PWM Pull-Up Current (μA) 6 -5 -10 -15 -20 -25 -30 -30 -35 -40 -40 -25 -10 5 VDD = 5.5V VDD = 2V IVDD Current (mA) VDD 5 4 3 2 1 0 -40 -25 -10 5 VDD = 2V VDD = 5.5V 20 35 50 65 80 95 110 125 Temperature (C°) 20 35 50 65 80 95 110 125 Temperature (C°) FIGURE 2-8: Temperature. Supply Current vs. FIGURE 2-10: Temperature. PWM Pull-Up Current vs. 3.0 PIN DESCRIPTIONS MTD6505 PIN FUNCTION TABLE Type O I — O O — O — I Name FG RPROG VBIAS OUT1 OUT2 GND OUT3 VDD DIR Motor speed indication output Km parameter setting with external resistors, see Table 4-2 for values Internal regulator output (for decoupling only) Single phase coil output pin Single phase coil output pin Negative voltage supply (ground) Single phase coil output pin Positive voltage supply for motor driver Motor Rotation Direction - Forward direction: connect pin to GND or leave floating - Reverse direction: connect pin to VBIAS PWM input signal for speed control Exposed pad (can be connected to the ground plan for better thermal dissipation) Function The descriptions of the pins are listed in Table 3-1. TABLE 3-1: Pin Number 1 2 3 4 5 6 7 8 9 10 11 I — PWM EP Legend: I = Input; O = Output DS22281A-page 8  2011 Microchip Technology Inc. MTD6505 4.0 FUNCTIONAL DESCRIPTION 4.3 Frequency Generator Function 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. 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 highimpedance until the motor is restarted. Leave the pin open when it is not used. 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 (VDD). 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 1 kHz to 100 kHz). Since the PWM pin has an internal pull-up resistor connected to VDD, 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. 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. 4.4 Lockup Protection and Automatic Restart If the motor is blocked and cannot rotate freely, a lockup 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” (TWAIT), the lock-up protection is released and normal operation resumes for a given time (TRUN). If the motor is still blocked, a new period of waiting time is started. TWAIT and TRUN timings are fixed internally, so that no external 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 4.2 Motor Rotation Direction The current-carrying order of the outputs depends on the DIR pin state (“Rotation Direction”) and is described in Table 4-1. The DIR pin is not designed for dynamic direction change during operation. The MTD6505 device has a thermal protection function which detects when the die temperature exceeds TJ = +170°C. When this temperature is reached, the circuit enters the Thermal Shutdown mode, and the outputs OUT1, OUT2 and OUT3 are disabled (highimpedance), avoiding the IC destruction and allowing the circuit to cool down. When the junction temperature (TJ) drops below +145°C, normal operation resumes. The thermal detection circuit has +25°C hysteresis. Thermal shutdown TABLE 4-1: MOTOR ROTATION DIRECTION OPTIONS (DIR PIN) Rotation Direction Forward Outputs Activation Sequence OUT1  OUT2  OUT3 DIR Pin State Connected to GND or Floating Connected to VBIAS Normal operation +145° +170° TJ Reverse OUT3  OUT2  OUT1 FIGURE 4-1: Hysteresis. Thermal Protection  2011 Microchip Technology Inc. DS22281A-page 9 MTD6505 4.7 Internal Voltage Regulator VBIAS voltage is generated internally and is used to supply internal logical blocks. The VBIAS pin is used to connect an external decoupling capacitor (1 µF 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. TABLE 4-2: Km Option Km0 Km1 Km2 Km3 Km SETTINGS Km (mV/Hz) Range Phase-to-Phase Min 3.25 6.5 13 26 Max 6.5 13 26 52 GND 24 k 3.9 k VBIAS RPROG The RPROG sensing is actually a sequence that is controlled by the firmware. For any given RPROG, the internal control block will output the corresponding Km range. DS22281A-page 10  2011 Microchip Technology Inc. MTD6505 5.0 5.1 PACKAGING INFORMATION Package Marking Information 10-Lead UDFN (3x3x0.5 mm) Example Device MTD6505T-E/NA Code AAAD AAAD 1141 256 Legend: XX...X Y YY WW NNN * Note: e3 Customer-specific information Year code (last digit of calendar year) Year code (last 2 digits of calendar year) Week code (week of January 1 is week ‘01’) Alphanumeric traceability code Pb-free JEDEC designator for Matte Tin (Sn) This package is Pb-free. The Pb-free JEDEC designator ( e3 ) can be found on the outer packaging for this package. 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.  2011 Microchip Technology Inc. DS22281A-page 11 MTD6505 DS22281A-page 12  2011 Microchip Technology Inc. MTD6505  2011 Microchip Technology Inc. DS22281A-page 13 MTD6505 NOTES: DS22281A-page 14  2011 Microchip Technology Inc. MTD6505 APPENDIX A: REVISION HISTORY Revision A (November 2011) This is the original release of this document.  2011 Microchip Technology Inc. DS22281A-page 15 MTD6505 NOTES: DS22281A-page 16  2011 Microchip Technology Inc. MTD6505 PRODUCT IDENTIFICATION SYSTEM To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office. PART NO. T -X Temperature /XX Package Examples: a) MTD6505T-E/NA Tape and Reel, Extended Temperature 10LD UDFN Package Device Tape & Reel Device: MTD6505T: 3-Phase Brushless DC, Sinusoidal Sensorless Fan Motor Driver (Tape and Reel) E NA = = Extended -40°C to +125°C Plastic Dual Flat, thermally-enhanced, 3x3x0.5 mm Body (UDFN) Temperature Range: Package:  2011 Microchip Technology Inc. DS22281A-page 17 MTD6505 NOTES: DS22281A-page 18  2011 Microchip Technology Inc. Note the following details of the code protection feature on Microchip devices: • • • Microchip products meet the specification contained 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 in 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 products in a manner outside the operating specifications 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 semiconductor 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 committed to continuously improving 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. 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, KEELOQ, KEELOQ logo, MPLAB, PIC, PICmicro, PICSTART, PIC32 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, Application 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 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, KEELOQ® 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.  2011 Microchip Technology Inc. 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