1 Features

• Three-phase BLDC gate driver with integrated

sensorless motor control algorithm

– Code-free single shunt Field Oriented Control

– Supports up to 1.8 kHz (electrical frequency)

– Support flux weakening control

– 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 or current

control or modulation index control

– 5-point configurable reference profile support

– Anti-voltage surge prevents overvoltage

– Improved acoustic performance with automatic

dead time compensation

– Support maximum torque per ampere (MTPA)

– Offline motor back EMF measurement

– Variable monitoring through DACOUT

• 65-V Three-phase 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

• Configurable non-volatile memory (EEPROM) to

store device configuration

• Supports up to 75-kHz PWM frequency for low

inductance motor support

• 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

• A suite of integrated protection features

– Supply under-voltage lockout (UVLO)

– Motor lock detection (3 different types)

– Over-current 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

• Washer and Dishwashers Pumps

• Appliance Fans and Pumps

• Cordless Garden and Power Tools, Lawnmowers

3 Description

The MCF8329A provides a single-chip, code-free

sensorless FOC solution for applications driving

brushless-DC motors (BLDC) or Permanent Magnet

Synchronous motor (PMSM). The MCF8329A

provides three half-bridge gate drivers, each capable

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

MOSFETs. The device generates the 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 a

100 duty cycle. The MCF8329A can operate from a

single power supply and supports a wide input supply

range of 4.5 to 60 V.

The algorithm configuration can be stored in nonvolatile

EEPROM, which allows the device to operate

stand-alone once it has been configured. Motor

current is sensed using an integrated current-sensing

amplifier supporting a single external shunt resistor.

MCF8329A integrates a large number of protection

features, intended to protect the device, motor, and

system against fault events.