Datasheet MTD6505 Datasheet

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 le 3 -1 .

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 (R
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

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

) setting to fit motor

PROG

BIAS

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

Applications

• Notebook CPU Cooling Fans

• 5V 3-Phase BLDC Motors

 2011 Microchip Technology Inc. DS22281A-page 1

MTD6505

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

Functional Block Diagram

DS22281A-page 2  2011 Microchip Technology Inc.

Typical Application

Recommended External Components for Typical Application

Element Type/Value Comment

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 Connect to Vlogic on microcontroller side (FG Pull-Up).

R2 3.9 kΩ or 24 kΩ 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 Km3Km1,2

R

PROG

V

BIAS

V

BIAS

MTD6505

 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

Absolute Maximum Ratings†

Power Supply Voltage (V

Maximum Output Voltage (V

Maximum Output Current

FG Maximum Output Voltage (V

FG Maximum Output Current (I

Maximum Voltage (V

V

DD

PWM Maximum Voltage (V

Allowable Power Dissipation

Max Junction Temperature (T

ESD protection on all pins 2kV

) ...................... -0.7 to +7.0V

DD_MAX

OUT_MAX

(2)

(I

DD_MAX

PWM_MAX

(1)

) ............... -0.7 to +7.0V

OUT_MAX

J

) ....................1000 mA

) ........... -0.7 to +7.0V

FG_MAX

) ...................... 5.0 mA

FG_MAX

) ..................... -0.7 to +4.0V

) ................ -0.7 to +7.0V

(P

)......................... 1.5W

D_MAX

)...................................+150°C

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

is also internally limited, according to the

OUT

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 Sym Min Typ Max Units Conditions

Power Supply Voltage V

Power Supply Current I

Standby Current I

OUT1 High Resistance R

OUT2 Low Resistance R

OUT3 Total Resistance R

Internal

V

BIAS

DD

VDD

VDD_STB

ON(H)

ON(L)

ON(H+L)

V

BIAS

Supply Voltage

PWM Input Frequency f

PWM Input H Level V

PWM Input L Level V

PWM Internal Pull-Up

PWM

PWM_H

PWM_L

R

PWM_0

Resistor

PWM Internal Pull-Up

R

PWM

Resistor

DIR Input H Level V

DIR Input L Level V

DIR Internal Pull-Down

DIR_H

DIR_L

R

DIR

Resistor

FG Output Pin Low

V

OL_FG

Level Voltage

FG Output Pin Leakage

I

LH_FG

Current

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)

2—5.5V

—510mAV

—3040µAPWM=0V, V

DD

=5V

DD

(Standby mode)

—0.75— Ω I

—0.75— Ω I

—1.5—Ω I

—3—VV

—V

– 0.2 — V VDD<3.2V

DD

=0.5A, VDD=5V

OUT

=0.5A, VDD=5V

OUT

=0.5A, VDD=5V

OUT

= 3.2V to 5.5V

DD

1—100kHz

0.55*V

DD

—VDDVVDD  4.5V

0—0.2*VDDVVDD  4.5V

—266—kΩ PWM = 0V

—133—kΩ PWM duty-cycle > 0%

0.55*V

DD

—VDDVVDD  4.5V

0—0.2*VDDVVDD  4.5V

100 — 200 kΩ

——0.25VI

=-1mA

FG

-10 — 10 µA VFG=5.5V

=5V

 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 Sym Min Typ Max Units Conditions

Lock Protection
Operating Time

Lock Protection Waiting
Time

Overcurrent Protection I

Overvoltage Protection V

Short Protection on
High Side

Short Protection on
Low Side

Thermal Shutdown T

Thermal Shutdown
Hysteresis

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)

T

RUN

T

WAIT

OC_MOT

OV

I

OC_SW_H

I

OC_SW_L

SD

T

SD_HYS

—0.5—s

4.5 5 5.5 s Note 2

—750—mA

—7.2—V

—2.57— A

—-2.83— A

—170—°C

—25—°C

TEMPERATURE SPECIFICATIONS

Electrical Specifications: Unless otherwise specified, all limits are established for VDD = 5.5V to 2.0V, TA = +25°C.

Parameters Sym Min Typ Max Units Conditions

Temperature Ranges

Operating Temperature T

Storage Temperature Range T

Thermal Package Resistances

Thermal Resistance, 10L-UDFN 

OPR

STG

JA

-40 — +125 °C

-55 — +150 °C

—96.6— °C/W

DS22281A-page 6  2011 Microchip Technology Inc.

MTD6505

-3

-2.5

-2

-1.5

-1

-0.5

0

0.5

1

or Frequeny Deviation

(%)

VDD= 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°)

VDD= 5.5V

VDD= 2V

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°)

1.5

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)

VDD(V)

1

1.5

2

2.5

PWM V

IL

(V)

VDD = 5.5VDD = 5.5VDD= 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 = 5.5VDD = 5.5VDD= 5.5V

VDD= 2V

1

1.5

2

2.5

3

PWM V

IH

(V)

VDD= 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°)

VDD= 5.5V

VDD= 2V

2

2.5

3

3.5

4

4.5

5

5.5

6

ON High Side ()

VDD= 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°)

VDD= 5.5V

VDD= 2V

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 = 5.5V to 2.0V, OUT1, 2, 3 and PWM open.

FIGURE 2-1: Oscillator Frequency Deviation vs. Temperature.

FIGURE 2-2: Internal Regulated Voltage
(V

) vs Temperature.

BIAS

FIGURE 2-4: Inputs (PWM, DIR) V
Temperature.

FIGURE 2-5: Inputs (PWM, DIR) V
Temperature.

IL

IH

vs.

vs.

FIGURE 2-3: Internal Regulated Voltage
(V

) vs Supply Voltage (VDD).

BIAS

 2011 Microchip Technology Inc. DS22281A-page 7

FIGURE 2-6: Outputs R
Resistance vs. Temperature.

High Side

ON

MTD6505

2

2.5

3

3.5

4

4.5

5

5.5

6

N Low Side ()

VDD= 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°)

VDD= 5.5V

VDD= 2V

3

4

5

6

7

DD

Current (mA)

VDD= 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°)

VDD= 2V

VDD= 5.5V

20

30

40

50

60

_STB

Current (μA)

VDD= 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 (μA)

Temperature (C°)

VDD= 5.5V

VDD= 2V

-25

-20

-15

-10

-5

0

Pull-Up Current (μA)

VDD= 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 (μA)

Temperature (C°)

VDD= 2V

VDD= 5.5V

Note: Unless indicated, TA = +25°C, VDD = 5.5V to 2.0V, OUT1, 2, 3 and PWM open.

FIGURE 2-7: Outputs RON Low Side Resistance vs. Temperature.

FIGURE 2-8: Supply Current vs. Temperature.

3.0 PIN DESCRIPTIONS

The descriptions of the pins are listed in Tab le 3 -1 .

TABLE 3-1: MTD6505 PIN FUNCTION TABLE

Pin

Number

1 O FG Motor speed indication output

2IR

3—V

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

9 I DIR Motor Rotation Direction

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

DS22281A-page 8  2011 Microchip Technology Inc.

Type Name Function

PROG

BIAS

DD

FIGURE 2-9: Stand-By Current vs. Temperature.

FIGURE 2-10: PWM Pull-Up Current vs. Temperature.

Km parameter setting with external resistors, see Table 4-2 for values

Internal regulator output (for decoupling only)

Positive voltage supply for motor driver

- Forward direction: connect pin to GND or leave floating

- Reverse direction: connect pin to V

BIAS

MTD6505

T

J

+145°

Thermal shutdown

+170°

Normal

operation

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. 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
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.

4.2 Motor Rotation Direction

The current-carrying order of the outputs depends on
the DIR pin state (“Rotation Direction”) and is described
in Tab le 4 -1 . The DIR pin is not designed for dynamic
direction change during operation.

, it is recommended to drive it

DD

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 high­impedance 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 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” (T
the lock-up protection is released and normal operation
resumes for a given time (T
blocked, a new period of waiting time is started. T
and T
nal capacitor is required.

timings are fixed internally, so that no exter-

RUN

). If the motor is still

RUN

WAIT

WAIT

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
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

) drops below +145°C, normal operation resumes.

(T

J

The thermal detection circuit has +25°C hysteresis.

),

TABLE 4-1: MOTOR ROTATION

DIRECTION OPTIONS
(DIR PIN)

DIR Pin State

Connected
to GND
or Floating

Connected
to V

BIAS

 2011 Microchip Technology Inc. DS22281A-page 9

Rotation

Direction

Forward OUT1  OUT2  OUT3

Reverse OUT3  OUT2  OUT1

Outputs Activation

Sequence

FIGURE 4-1: Thermal Protection Hysteresis.

MTD6505

4.7 Internal Voltage Regulator

V

voltage is generated internally and is used to

BIAS

supply internal logical blocks. The V
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 SETTINGS

Km

Option

Km0 3.25 6.5 GND

Km1 6.5 13 24 k

Km2 13 26 3.9 k

Km3 26 52 V

The R

PROG

trolled by the firmware. For any given R
nal control block will output the corresponding Km
range.

Km (mV/Hz) Range

Phase-to-Phase

Min Max

sensing is actually a sequence that is con-

pin is used to

BIAS

PROG

R

PROG

BIAS

, the inter-

DS22281A-page 10  2011 Microchip Technology Inc.

5.0 PACKAGING 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

5.1 Package Marking Information

MTD6505

 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.

APPENDIX A: REVISION HISTORY

Revision A (November 2011)

This is the original release of this document.

MTD6505

 2011 Microchip Technology Inc. DS22281A-page 15

MTD6505

NOTES:

DS22281A-page 16  2011 Microchip Technology Inc.

PRODUCT IDENTIFICATION SYSTEM

Device: MTD6505T: 3-Phase Brushless DC, Sinusoidal Sensorless

Fan Motor Driver (Tape and Reel)

Temperature Range: E = Extended -40°C to +125°C

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 /XX

PackageTempe ra tureTape & Reel

Device

To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.

MTD6505

 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
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INCLUDING BUT NOT LIMITED TO ITS CONDITION,
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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

EELOQ, KEELOQ logo, MPLAB, PIC, PICmicro, PICSTART,

32

logo, rfPIC and UNI/O are registered trademarks of

PIC
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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
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.

®

MCUs and dsPIC® DSCs, KEELOQ

®

code hopping

 2011 Microchip Technology Inc. DS22281A-page 19

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08/02/11

DS22281A-page 20  2011 Microchip Technology Inc.