MTD6502B
5V 3-Phase BLDC Sinusoidal Sensorless Fan Motor Driver
Features:
• 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 V
DD
• 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
Description:
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).
With the compact packaging and minimum bill-of-
material (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
safety-enhanced operations.
The MTD6502B is available in a compact thermally-
enhanced 3 mm x 3 mm TDFN package.
Applications:
• Notebook CPU Cooling Fans
• 5V 3-Phase Brushless DC Motors
Package Types
MTD6502B
3x3 TDFN*
FG 1
GND 2
V
DD
3
OUT1 4
OUT2 5
EP
11
10 PWM
9 DIR
8 V
CC
7 OUT3
6 GND
* Includes Exposed Thermal Pad (EP); see
Table 2-1.
©
2011 Microchip Technology Inc.
DS25003B-page 1
MTD6502B
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 (V
CC_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
(2)
(P
D_MAX
).........................1.5W
Maximum Junction Temperature (T
J
) .......................... +150°C
Note 1:
Reference PCB, according to JEDEC
standard EIA/JESD 51-9.
2:
I
OUT
is also internally limited, according
to limits defined in the
Electrical
Characteristics.
ELECTRICAL CHARACTERISTICS
Electrical Specifications:
Unless otherwise specified, all limits are established for T
A
= +25°C
Parameters
Power Supply Voltage
Power Supply Current
OUTx High Resistance
OUTx Low Resistance
OUTx Total Resistance
V
DD
Output Voltage
PWM Input Frequency
PWM Input H Level
PWM Input L Level
PWM Internal Pull-Up Current
DIR Internal Pull-Down Current
FG Output Pin Low Level Voltage
FG Output Pin Leakage Current
Lock Protection
Operating Time
Lock Protection Waiting Time
Overcurrent Protection
Thermal Shutdown
Thermal Shutdown Hysteresis
Sym
V
CC
I
VCC
R
ON(H)
R
ON(L)
R
ON(H+L)
V
DD
f
PWM
V
PWM_H
V
PWM_L
I
PWM_L
I
DIR
V
OL_FG
I
LH_FG
T
RUN
T
WAIT
I
OC_MOT
T
SD
T
SD_HYS
Min
2
—
—
—
—
—
—
1
0.55*V
CC
0
—
—
—
—
—
4.5
—
—
—
Typ
—
50
0.75
0.75
1.5
3
V
CC
– 0.2
—
—
—
—
20
—
—
0.5
5
750
170
25
Max
5.5
—
1
1
2
—
—
100
V
CC
0.2*V
CC
55
—
0.25
10
—
5.5
—
—
—
Units
V
µA
Ω
Ω
Ω
V
V
kHz
V
V
µA
µA
V
µA
s
s
mA
°C
°C
I
FG
= -1 mA
V
FG
= 5.5V
PWM =
0
PWM = 0, V
CC
= 5V
I
OUT
= 0.5A, V
CC
= 5V
I
OUT
= 0.5A, V
CC
= 5V
I
OUT
= 0.5A, V
CC
= 5V
V
CC
= 3.3V to 5.5V
V
CC
< 3.3V
Conditions
©
2011 Microchip Technology Inc.
DS25003B-page 5
51单片机
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