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 2011-2013 Microchip Technology Inc. DS20002281B-page 1

MTD6505

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

) settings to fit

motor constant (K

) 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

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 PSM or 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*

BIAS

PROG

OUT2

FG PWM

DIR

GND

OUT1 OUT3

*Includes Exposed Thermal Pad (EP); see Table 3-1.

Sinusoidal Sensorless 3-Phase Brushless DC (BLDC)

Fan Motor Driver

Summary of content (22 pages)

PAGE 1
MTD6505 Sinusoidal Sensorless 3-Phase Brushless DC (BLDC) Fan Motor Driver Features Description • 180° Sinusoidal Drive for high efficiency and low acoustic noise 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.
PAGE 2
MTD6505 Functional Block Diagram VBIAS VDD VDD CPU + peripherals PWM Output Drive Circuit FG OUT3 OUT2 OUT1 DIR GND Non-volatile memory RPROG DS20002281B-page 2 RPROG sense Adjustable Km Thermal protection Short-circuit protection Overcurrent protection Motor Phase Detection Circuit  2011-2013 Microchip Technology Inc.
PAGE 3
MTD6505 Typical Application KM0 KM1, 2 KM3 VBIAS VBIAS VDD R1 RPROG VBIAS C2 1 2 3 OUT1 4 OUT2 5 MTD6505 FG R2 10 PWM 9 DIR 8 VDD VDD 7 OUT3 6 GND C1 Recommended External Components for Typical Application Element Type/Value C1 >1 µF Connect as close as possible to IC input pins C2 >1 µF Connect as close as possible to IC input pins R1 >10 kΩ R2 3.9 kΩ or 24 kΩ  2011-2013 Microchip Technology Inc.
PAGE 4
MTD6505 NOTES: DS20002281B-page 4  2011-2013 Microchip Technology Inc.
PAGE 5
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. Absolute Maximum Ratings† Power Supply Voltage (VDD_MAX) ...................... -0.
PAGE 6
MTD6505 ELECTRICAL CHARACTERISTICS (CONTINUED) Electrical Specifications: Unless otherwise specified, all limits are established for VDD = 2.0V to 5.5V, TA = +25°C Parameters Sym Min Typ Max Units FG Output Pin Leakage Current ILH_FG -10 — 10 µA Lock Protection Operating Time TRUN — 0.5 — s Lock Protection Waiting Time TWAIT 4.5 5 5.5 s Overcurrent Protection IOC_MOT — 750 — mA Overvoltage Protection VOV — 7.2 — V Short Protection on High Side IOC_SW_H — 2.
PAGE 7
MTD6505 2.0 TYPICAL PERFORMANCE CURVES 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. Note: Unless indicated, TA = +25°C, VDD = 5.
PAGE 8
MTD6505 6 5.5 5 4.5 4 3.5 3 2.5 2 1.5 1 0.5 0 0 VDD = 2V VDD = 5.5V PWM Pull-Up Current (µA) RON ON Low Side (ȍ) Note: Unless indicated, TA = +25°C, VDD = 5.5V to 2.0V, OUT1, 2, 3 and PWM open. -5 -10 VDD = 2V -15 -20 -25 -30 VDD = 5.5V -35 -40 -40 -25 -10 5 20 35 50 65 80 95 110 125 Temperature (C°) FIGURE 2-7: Outputs RON Low Side Resistance vs. Temperature. -40 -25 -10 5 20 35 50 65 80 95 110 125 Temperature (C°) FIGURE 2-10: Temperature. PWM Pull-Up Current vs.
PAGE 9
MTD6505 3.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 3-1.
PAGE 10
MTD6505 NOTES: DS20002281B-page 10  2011-2013 Microchip Technology Inc.
PAGE 11
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 (VDD). When the PWM signal is High (or left open), the motor rotates at full speed.
PAGE 12
MTD6505 4.7 Internal Voltage Regulator 4.9 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. Defining the Correct RPROG Value This section explains how to define the correct KM value for a specific fan. The KM is linked to the RPROG (see Table 4-2).
PAGE 13
MTD6505 5.0 PACKAGING INFORMATION 5.1 Package Marking Information 10-Lead UDFN (3x3x0.5 mm) Legend: XX...X Y YY WW NNN e3 * Note: Example Device Code MTD6505T-E/NA AAAD AAAD 1315 256 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.
PAGE 14
MTD6505 DS20002281B-page 14  2011-2013 Microchip Technology Inc.
PAGE 15
MTD6505  2011-2013 Microchip Technology Inc.
PAGE 16
MTD6505 DS20002281B-page 16  2011-2013 Microchip Technology Inc.
PAGE 17
MTD6505 APPENDIX A: REVISION HISTORY Revision B (October 2013) The following is the list of modifications: 1. 2. 3. 4. 5. Updated the Absolute Maximum Ratings† section with the correct VBIAS parameter. Updated the Thermal Resistance values in the Temperature Specifications table. Added Figure 2-11 and Figure 2-12. Added Section 4.9 “Defining the Correct RPROG Value”. Minor grammatical and editorial corrections. Revision A (November 2011) This is the original release of this document.
PAGE 18
MTD6505 NOTES: DS20002281B-page 18  2011-2013 Microchip Technology Inc.
PAGE 19
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 Device Tape & Reel Temperature /XX Examples: Package a) Device: MTD6505T: 3-Phase Brushless DC, Sinusoidal Sensorless Fan Motor Driver (Tape and Reel) Temperature Range: E = Package: NA = MTD6505T-E/NA Tape and Reel, Extended Temperature 10LD UDFN Package Extended -40°C to +125°C Plastic Dual Flat, thermally-enhanced, 3x3x0.
PAGE 20
MTD6505 NOTES: DS20002281B-page 20  2011-2013 Microchip Technology Inc.
PAGE 21
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.
PAGE 22
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