Microchip MTD6502B-LC1-01 5v 3-phase bldc sinusoidal sensorless fan motor driver Datasheet

MTD6502B
5V 3-Phase BLDC Sinusoidal Sensorless Fan Motor Driver
Features:
Description:
• Position Sensorless BLDC Drivers
(No Hall Sensor Required)
• 180° Sinusoidal Drive, for High Efficiency and Low
Acoustic Noise
• Support 2V to 5.5V Power Supplies
• Direction Control:
- Forward direction: connect DIR pin to GND or
leave floating
- Reverse direction: connect DIR pin to VDD
• Speed Control through Power Supply Modulation
(PSM) and/or Pulse-Width Modulation (PWM)
• Built-in Frequency Generator (FG Output Signal)
• Built-in Lock-up Protection and Automatic
Recovery Circuit (External Capacitor not
Necessary)
• Built-in Over Current Limitation
• Built-in Thermal Shutdown Protection
• No External Tuning Required
• Available Packages:
- 3 mm x 3 mm TDFN-10
The MTD6502B device is a 3-phase full-wave driver for
brushless sensorless DC motors. It features 180°
sinusoidal drive, high torque output and silent drive.
With adaptive features, parameters and a wide range
of power-supplies (2V to 5.5V), the MTD6502B device
is intended to cover a wide range of motor
characteristics, while requiring minimum external components. Speed control can be achieved through either
power supply modulation or pulse-width modulation
(using the PWM digital input pin).
Applications:
• Notebook CPU Cooling Fans
• 5V 3-Phase Brushless DC Motors
With the compact packaging and minimum bill-ofmaterial (integrated power transistors, no Hall sensor,
no external tuning), the MTD6502B is best suited for
low-cost fan applications requiring high efficiency and
low acoustic noise, such as notebook CPU cooling
fans. Frequency generator (FG) output enables the
precision speed control in closed-loop applications.
The MTD6502B driver includes a lock-up protection
mode, which turns off the output current when the
motor is under lock condition, and an automatic recovery that enables the fan to run when the lock condition
is removed. The motor overcurrent limitation and thermal-shutdown protection are included for safetyenhanced operations.
The MTD6502B is available in a compact thermallyenhanced 3 mm x 3 mm TDFN package.
Package Types
MTD6502B
3x3 TDFN*
10 PWM
FG 1
9 DIR
GND 2
VDD 3
OUT1 4
OUT2 5
EP
11
8 VCC
7 OUT3
6 GND
* Includes Exposed Thermal Pad (EP); see Table 2-1.
 2011 Microchip Technology Inc.
DS25003A-page 1
MTD6502B
Functional Block Diagram
VCC
VREF
VDD
Motor Phase
Detection Circuit
Regulator
Over-current
protection
VCC
PWM
Controller
DIR
Output Drive Circuit
VCC
Soft Switching Drive
FG
OUT3
OUT2
OUT1
GND
Thermal
protection
DS25003A-page 2
Short-circuit
protection
 2011 Microchip Technology Inc.
MTD6502B
Typical Application
MCU Side
(Vlogic)
PWM Input
(1-100 kHz)
C1
1
FG
2
GND
3
VDD
4
OUT1
5
OUT2
MTD6502B
R1
PWM
10
DIR
9
VCC
8
OUT3
7
GND
6
VCC
C2
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
 2011 Microchip Technology Inc.
Comment
Connect to Vlogic on microcontroller side
DS25003A-page 3
MTD6502B
NOTES:
DS25003A-page 4
 2011 Microchip Technology Inc.
MTD6502B
1.0
ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings†
Power Supply Voltage (VCC_MAX) ...................... -0.7 to +7.0V
Maximum Output Voltage (VOUT_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(2)(PD_MAX).........................1.5W
Maximum Junction Temperature (TJ) .......................... +150°C
† 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: IOUT is also internally limited, according
to limits defined in the Electrical Characteristics.
ELECTRICAL CHARACTERISTICS
Electrical Specifications: Unless otherwise specified, all limits are established for TA = +25°C
Parameters
Sym
Min
Typ
Max
Units
VCC
2
—
5.5
V
Power Supply Current
IVCC
—
50
—
µA
PWM = 0, VCC = 5V
OUTx High Resistance
RON(H)
—
0.75
1
Ω
IOUT = 0.5A, VCC = 5V
OUTx Low Resistance
RON(L)
—
0.75
1
Ω
IOUT = 0.5A, VCC = 5V
OUTx Total Resistance
RON(H+L)
—
1.5
2
Ω
IOUT = 0.5A, VCC = 5V
VDD
—
3
—
V
VCC = 3.3V to 5.5V
—
VCC – 0.2
—
V
VCC < 3.3V
Power Supply Voltage
VDD Output Voltage
PWM Input Frequency
fPWM
1
—
100
kHz
PWM Input H Level
VPWM_H
0.8*VCC
—
VCC
V
PWM Input L Level
VPWM_L
0
—
0.2*VCC
V
PWM Internal Pull-Up Current
IPWM_L
—
—
55
µA
Conditions
PWM = 0
IDIR
—
20
—
µA
FG Output Pin Low Level Voltage
VOL_FG
—
—
0.25
V
IFG = -1 mA
FG Output Pin Leakage Current
ILH_FG
—
—
10
µA
VFG = 5.5V
Lock Protection
Operating Time
TRUN
—
0.5
—
s
DIR Internal Pull-Down Current
Lock Protection Waiting Time
Overcurrent Protection
Thermal Shutdown
Thermal Shutdown Hysteresis
 2011 Microchip Technology Inc.
TWAIT
4.5
5
5.5
s
IOC_MOT
—
750
—
mA
TSD
—
170
—
°C
TSD_HYS
—
25
—
°C
DS25003A-page 5
MTD6502B
TEMPERATURE SPECIFICATIONS
Electrical Specifications: Unless otherwise specified, all limits are established for VCC = 5.0V, TA = +25°C
Parameters
Sym
Min
Typ
Max
Units
Operating Temperature
TOPR
-40
—
+125
°C
Storage Temperature Range
TSTG
-55
—
+150
°C
JA
—
68
—
°C/W
Conditions
Temperature Ranges
Thermal Package Resistances
Thermal Resistance, 10L-TDFN
DS25003A-page 6
 2011 Microchip Technology Inc.
MTD6502B
2.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
MTD6502B
3x3 TDFN
MTD6502B PIN FUNCTION TABLE
Type
Name
Function
1
O
FG
2, 6
—
GND
Motor speed indication output
3
—
VDD
4
O
OUT1
Single phase coil output pin
5
O
OUT2
Single phase coil output pin
7
O
OUT3
Single phase coil output pin
8
—
VCC
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 VDD
10
I
PWM
11
—
EP
Negative voltage supply (ground)
Internal regulator output (for decoupling only)
PWM input signal for speed control
Exposed Thermal Pad (EP)
Legend: I = Input; O = Output
 2011 Microchip Technology Inc.
DS25003A-page 7
MTD6502B
NOTES:
DS25003A-page 8
 2011 Microchip Technology Inc.
MTD6502B
3.0
FUNCTIONAL DESCRIPTION
The MTD6502B generates a full-wave signal to drive a
3-phase sensorless BLDC motor. High efficiency and
low-power consumption are achieved due to the CMOS
transistors and synchronous rectification drive type.
3.1
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 (VCC). When the PWM signal is High (or left open), the motor rotates at full speed.
When the PWM signal is Low, the motor is stopped
(and the IC outputs are set to high-impedance). By
changing the PWM duty cycle, the speed can be
adjusted. Notice that the PWM frequency has no special meaning for the motor speed and is asynchronous
with the activation of the output transistors. Thus, the
user has the maximum freedom to choose the PWM
system frequency within a wide range (from 1 kHz to
100 kHz), while the output transistor activation always
occurs at a fixed rate (20 kHz, or 30 kHz), which is outside of the range of audible frequencies.
Note:
3.2
The standard output frequency is 30 kHz.
The 20 kHz output frequency option is
available upon request.
Motor Rotation Direction
The current carrying order of the outputs depends on
the DIR pin state (Rotation Direction) according to
Table 3-1.
TABLE 3-1:
Outputs Activation
Sequence
Connected to
GND or
Floating
Forward
OUT1  OUT2  OUT3
Connected to
VDD
Reverse OUT3  OUT2  OUT1
3.3
Frequency Generator Function
The Frequency Generator output (FG) is a “Hall-sensor
equivalent” digital output, that gives information to an
external controller about the speed and phase of the
motor. The FG pin is an open collector output, connecting to a logical voltage level through an external pull-up
resistor. When a lock (or 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 not used.
Note:
Lock-up Protection and Automatic
Restart
If the motor is blocked and cannot rotate freely, a
lock-up protection circuit detects this situation and disables the driver (by setting its outputs to high-impedance), in order 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 needed.
3.5
Overcurrent Protection
The motor peak current is limited by the driver to a fixed
value (defined internally), thus limiting the maximum
power dissipation in the coils.
3.6
Thermal Shutdown
The MTD6502B 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. Once the junction temperature
(TJ) has dropped below +145°C, the normal operation
resumes (thermal detection circuit has +25°C hysteresis function).
Thermal shutdown
MOTOR ROTATION
DIRECTION OPTIONS
(DIR PIN)
Rotation
Direction
DIR Pin State
3.4
Normal
operation
+145°
FIGURE 3-1:
Hysteresis.
3.7
+170°
TJ
Thermal Protection
Internal Voltage Regulator
VDD voltage is generated internally and is used to supply the internal logical blocks. The VDD 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.
FG/2 option is available upon request for
8-pole applications.
 2011 Microchip Technology Inc.
DS25003A-page 9
MTD6502B
3.8
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, there
may be some inconsistency in the exact definition of
Km and its measurement criteria among different motor
manufacturers. In order to work with various motor
applications, the MTD6502B offers various options to
adopt a wide range of BEMF coefficient. The BEMF
coefficient (Km) is defined as the peak value of the
phase-to-phase BEMF voltage, normalized to the
electrical speed of the motor.
TABLE 3-2:
KM OPTIONS
Km (mV/Hz) Range
Phase-to-Phase
Option
Min
Max
3.25
6.5
0
6.5
13
1
13
26
2
DS25003A-page 10
 2011 Microchip Technology Inc.
MTD6502B
4.0
PACKAGING INFORMATION
4.1
Package Marking Information
10-Lead TDFN (3x3x0.9 mm)
Example
XXXX
YYWW
NNN
AAAA
1104
256
PIN 1
PIN 1
Device
Legend: XX...X
Y
YY
WW
NNN
e3
*
Note:
Code
MTD6502B-LC1-00
AAAA
MTD6502B-LC1-01
AAAB
MTD6502B-LC1-02
AAAC
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.
DS25003A-page 11
MTD6502B
Note:
For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
DS25003A-page 12
 2011 Microchip Technology Inc.
MTD6502B
Note:
For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
 2011 Microchip Technology Inc.
DS25003A-page 13
MTD6502B
NOTES:
DS25003A-page 14
 2011 Microchip Technology Inc.
MTD6502B
APPENDIX A:
REVISION HISTORY
Revision A (March 2011)
• Original Release of this Document.
 2011 Microchip Technology Inc.
DS25003A-page 15
MTD6502B
NOTES:
DS25003A-page 16
 2011 Microchip Technology Inc.
MTD6502B
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.
-X
XX
Device Tape&Reel
Device:
-XX
Package
MTD6502B-L:
=
Km Range
Value
3-Phase BLDC Sinusoidal Sensorless Fan
Motor Driver (Tape and Reel)
Package:
C1
Plastic Dual Flat, No Lead Package, 3x3x0.9 mm
Body (TDFN)
Km Range Value:
See Table 3-2 for details.
 2011 Microchip Technology Inc.
Examples:
a)
MTD6502B-LC1-00
b)
MTD6502B-LC1-01
c)
MTD6502B-LC1-02
Tape and Reel,
10LD TDFN Pkg,
Km Range Value = 0
Tape and Reel,
10LD TDFN Pkg,
Km Range Value = 1
Tape and Reel,
10LD TDFN Pkg,
Km Range Value = 2
DS25003A-page 17
MTD6502B
NOTES:
DS25003A-page 18
 2011 Microchip Technology Inc.
MTD6502B
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
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 2011 Microchip Technology Inc.
DS25003A-page 19
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DS25003A-page 20
 2011 Microchip Technology Inc.
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