MTD6508 Datasheet PDF - Microchip

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MTD6508
Microchip

Part Number MTD6508
Description 3-Phase Sinusoidal Sensorless Brushless DC Fan Motor Driver
Page 26 Pages


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MTD6508
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
Package Types
MTD6508
3x3 UDFN-10*
FG 1
RPROG 2
VBIAS 3
OUT1 4
OUT2 5
10 PWM
EP 9 FG3_SEL
11 8 VDD
7 OUT3
6 GND
MTD6508
4x4 UQFN-16*
16 15 14 13
FG 1
12 RT
RPROG 2
VBIAS 3
EP 11 PWM
17 10 FG3_SEL
OUT2 4
9 VDD
567 8
Note: The DIR, SS and RT pins that are not available on UDFN-10 Package are internally pulled down. SR1 and
SR2 are connected by a fixed internal resistor (25 k).
*Includes Exposed Thermal Pad (EP); see Table 3-1.
Functional Block Diagram
VBIAS
RT SS DIR
VDD
FG
PWM
FG3_SEL
RPROG
CPU + Peripherals
Nonvolatile
Memory
RPROG Sense
Adju stable KM
Motor Phase
Detection Circuit
Thermal
Protection
Overcurrent
Protection
Slew Rate
Control
Short-Circuit
Protection
OUT3
OUT2
OUT1
GND
SR1
SR2
DS20005359A-page 2
2015 Microchip Technology Inc.



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MTD6508
Typical Application
VLOGI C
VLOGI C
KM0
KM1, 2
VBIA S
KM3
VBIA S
C2
VLOGI C
VLOGI C
16 15 14 13
FG RT
1 12
VLOGI C
RPROG
2
VBIAS 3
OUT2 4
PWM
11
EP
17 FG3_SEL
10
9 VDD
VDD
5678
C1
PWM input
(1-100 kHz)
VBIA S
Legend
VLOGIC = VBIAS or VDD
= Optional
Recommended External Components for Typical Application
Element
C1
C2
RFG
RPWM
RPROG
RSR
Type/Value
1 µF
1 µF
10 k
100 k
3.9 kor 24 k
4.7 k-47 k
Comment
Connect as close as possible to IC input pin
Connect as close as possible to IC input pin
Connect to Vlogic on microcontroller side (FG Pull-Up)
Connect to Vlogic on microcontroller side (PWM Pull-Up)
Select appropriate programming resistor value, see Table 4-1
Select appropriate output PWM slew rate, see Table 4-2
2015 Microchip Technology Inc.
DS20005359A-page 3



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MTD6508
NOTES:
DS20005359A-page 4
2015 Microchip Technology Inc.



MTD6508 datasheet pdf
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