1 Features

• Three-phase BLDC gate driver with integrated

sensorless motor control algorithm

– Code-free high speed Trapezoidal Control

– Supports up to 3 kHz (electrical frequency)

– Very fast startup time (<50 ms)

– Fast Deceleration (<150 ms)

– Supports 120° or 150° modulation to improve

acoustic performance

– Forward and reverse windmilling support

– Analog, PWM, freq. or I2C based control input

– Configurable motor startup and stop options

– Optional closed loop speed or power control,

open loop voltage control

– 5-point configurable reference profile support

– Anti-voltage surge prevents overvoltage

– Variable monitoring through DACOUT

• 65-V Three phase half-bridge gate driver

– Drives 3 high-side and 3 low-side N-Channel

MOSFETs, 4.5 to 60-V operating voltage

– Supports 100 PWM duty cycle

– Bootstrap based gate driver architecture

– 1-A/2-A Maximum peak source/sink current

• Integrated current sense amplifier

– Adjustable gain (5, 10, 20, 40 V/V)

• Low power sleep mode

– 5-μA (maximum) at VPVDD = 24-V, TA = 25°C

• Speed loop accuracy: < 3 with internal clock

• Supports up to 100-kHz PWM frequency

• Accurate LDO (AVDD) 3.3-V ±3, 50-mA support

with AVDD connected to VREG

• Independent driver shutdown path (DRVOFF)

• Spread spectrum for EMI mitigation

• Suite of Integrated protection features

– Supply undervoltage lockout (UVLO)

– Motor lock detection (3 different types)

– Overcurrent protection (OCP)

– Thermal shutdown (TSD)

– Fault condition indication pin (nFAULT)

– Optional fault diagnostics over I2C interface

2 Applications

• Brushless-DC (BLDC) Motor Modules

• Cordless Vacuum Cleaners

• HVAC Blowers and Ventilators

• Appliance Fans and Pumps

• Cordless Garden and Power Tools, Lawnmowers

3 Description

The MCT8329A provides a single-chip, code-free

sensorless trapezoidal solution for applications

requiring high speed operation or very fast startup

time for three phase brushless-DC motors. The device

provide three half-bridge gate drivers, each capable

of driving high-side and low-side N-channel power

MOSFETs. The device generates correct gate drive

voltages using an internal charge pump and enhances

the high-side MOSFETs using a bootstrap circuit. A

trickle charge pump is included to support 100 duty

cycle. The gate drive architecture supports peak gate

drive currents up to 1-A source and 2-A sink. The

MCT8329A can operate from a single power supply

and supports a wide input supply range of 4.5 to 60 V.

Sensorless trapezoidal control is highly configurable

through register settings in a non-volatile EEPROM

(MCT8329A1I) ranging from motor start-up behavior

to closed loop operation, which allows the device

to operate stand-alone once it has been configured.

Motor current is sensed using an integrated current

sensing amplifier supporting single external shunt

resistor. The device receives a speed command

through a PWM input or analog voltage or variable

frequency square wave or I2C command. There are a

large number of protection features integrated into the

MCT8329A, intended to protect the device, motor, and

system against fault events.