MTD6508 Datasheet PDF - Microchip
Part Number | MTD6508 | |
Description | 3-Phase Sinusoidal Sensorless Brushless DC Fan Motor Driver | |
Manufacturers | Microchip | |
Logo | ||
There is a preview and MTD6508 download ( pdf file ) link at the bottom of this page. Total 26 Pages |
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3-Phase Sinusoidal Sensorless 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
• Variable Programming Resistor (RPROG) Setting
to fit Motor Constant (KM) Range from 3.25 mV/
Hz to 52 mV/Hz
• Speed Control through Power Supply Modulation
(PSM) and/or Pulse-Width Modulation (PWM)
• Built-in Frequency Generator: FG, FG/3 Output
Signal (FG/2 and FG/6 Option are available upon
request)
• Output PWM Slew Rate Control Programmable
with an External Resistor for Start-up
(Adjustable version)
• Phase Target Selection for Regulation
(Adjustable Version)
• Start-up Strength Selection (Adjustable Version)
• Start-up Output Current Controlled by PWM
• Output Current Soft Start
• Built-in Lock-up Protection and Automatic
Recovery Circuit
• Built-in Overcurrent Limitation
• Built-in Thermal Shutdown Protection
• Built-in Overvoltage Protection
• Low Minimal Start-up Speed for Low-Speed
Operation
• Packages:
- 10-Lead 3 mm x 3 mm x 0.5 mm UDFN
- 16-Lead 4 mm x 4 mm x 0.5 mm UQFN
(Adjustable version)
Applications
• Notebook CPU Cooling Fans
• 5V 3-Phase BLDC Motors
Description
The MTD6508 device is a 3-phase, full-wave
sensorless driver for brushless DC (BLDC) motors. It
features a 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
MTD6508 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).
Compact packaging and a minimal bill of materials
make the MTD6508 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 MTD6508 device includes Lock-up 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 MTD6508 is available in compact, thermally-
enhanced, 10-Lead 3 mm x 3 mm x 0.5 mm UDFN
packages and 16-Lead 4 mm x 4 mm x 0.5 mm
UQFN packages.
2015 Microchip Technology Inc.
DS20005359A-page 1
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MTD6508
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings†
Power Supply Voltage (VDD_MAX) ...................... -0.7 to +7.0V
Maximum Output Voltage (VOUT_MAX) ............... -0.7 to +7.0V
Maximum Output Current (IOUT_MAX)(1) ....................1000 mA
FG Maximum Output Voltage (VFG_MAX) ........... -0.7 to +7.0V
FG Maximum Output Current (IFG_MAX) ......................5.0 mA
VBIAS Maximum Voltage (VBIAS_MAX) ................ -0.7 to +4.0V
PWM Maximum Voltage (VPWM_MAX) ................ -0.7 to +7.0V
Allowable Power Dissipation (PD_MAX)(2)........................1.5W
Maximum Junction Temperature (TJ) .......................... +150°C
ESD protection on all pins 2 kV
† 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: IOUT is also internally limited, according
to the limits defined in the Electrical
Characteristics table.
2: Reference Printed Circuit Board (PCB)
according to JEDEC standard EIA/JESD
51-9.
ELECTRICAL CHARACTERISTICS
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
Conditions
Power Supply Voltage
Power Supply Current
Standby Current
VDD
IVDD
IVDD_STB
2
—
—
— 5.5 V
5 10 mA VDD = 5V
15 25 µA PWM = 0V, VDD = 5V
(Standby mode)
OUTX High Resistance
RON(H)
—
0.75 —
Ω IOUT = 0.5A, VDD = 5V
OUTX Low Resistance
RON(L)
—
0.75 —
Ω IOUT = 0.5A, VDD = 5V
OUTX Total Resistance
RON(H+L)
—
1.5 — Ω IOUT = 0.5A, VDD = 5V
VBIAS Internal
Supply Voltage
VBIAS
— 3—
—
VDD – 0.2
—
V VDD = 3.2V to 5.5V
V VDD < 3.2V
PWM Input Frequency
fPWM
1
— 100 kHz
PWM Input H Level
VPWM_H 0.55 VDD
—
VDD
V VDD 4.5V
PWM Input L Level
VPWM_L
0
— 0.2 VDD V VDD 4.5V
FG3_SEL Input H Level
VFG3_SEL_H VBIAS – 0.5
—
VBIAS
V VDD 4.5V
FG3_SEL Input L Level
VFG3_SEL_L
0
— 0.2 VDD V VDD 4.5V
FG Output Pin Low-Level
Voltage
VOL_FG
—
— 0.25 V IFG = -1 mA
FG Output Pin Leakage
Current
ILH_FG
-10
— 10 µA VFG = 5.5V
Lock Protection
Operating Time
TRUN
—
0.5 1
s
Lock Protection Waiting Time
Overcurrent Protection
TWAIT
IOC_MOT
5
—
5.5 6
s Note 1
750 — mA Note 2
Note 1: Related to the internal oscillator frequency (see Figure 2-1)
2: 750 mA is the standard option for MTD6508. Additional overcurrent protection levels are available upon
request. Please contact factory for different overcurrent protection values.
2015 Microchip Technology Inc.
DS20005359A-page 5
Preview 5 Page |
Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for MTD6508 electronic component. |
Information | Total 26 Pages | |
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