1 Features

? Three-phase BLDC motor driver with integrated

sensored trapezoidal control

– Hall Sensor based trapezoidal (120°)

commutation

– Supports analog or digital hall inputs

– Configurable PWM modulation: synchronous/

asynchronous

– Cycle-by-cycle current limit to limit phase

current

– Supports up to 100-kHz PWM frequency

– Automatic synchronous rectification to reduce

power losses

? 5.0-V to 35-V operating voltage (40-V abs max)

? High output current capability: 1.5-A Peak

? Low MOSFET on-state resistance

– 575-mΩ RDS(ON) (HS + LS) at TA = 25°C

? Low-power sleep mode

– 1.5-μA at VVM = 24-V, TA = 25°C

? Integrated current limiting eliminates external

current sense resistors

? Flexible device configuration options

– MCT8314ZS: 5-MHz 16-bit SPI interface for

device configuration and fault status

– MCT8314ZH: Hardware pin-based

configuration

? Supports 1.8-V, 3.3-V, and 5-V logic inputs

? Built-in 5-V (5), 30-mA LDO regulator

? A suite of integrated protection features

– Supply undervoltage lockout (UVLO)

– Charge pump undervoltage (CPUV)

– Overcurrent protection (OCP)

– Motor lock protection

– Thermal warning and shutdown (OTW/OTSD)

– Fault condition indication pin (nFAULT)

– Optional fault diagnostics over SPI

2 Applications

? Brushless-DC (BLDC) Motor Modules

? HVAC motors

? Small home appliances

? Office automation machines

? Factory automation and robotics

3 Description

The MCT8314Z provides a single-chip, codefree

sensored trapezoidal commutation device for

customers driving 12- to 24-V brushless-DC motors.

The MCT8314Z integrates three 1/2-H bridges with

40-V absolute maximum capability and a low RDS(ON)

of 575-mΩ (high-side and low-side combined) to

enable high power drive capability. The integrated

current limiting feature limits motor currents during

start-up or high load conditions while eliminating the

need for external sense resistors. An integrated 5-V

LDO generates the necessary voltage rail for the

device and can power external circuits.

MCT8314Z implements sensored trapezoidal control

in a fixed-function state machine, so an external

microcontroller is not required to spin the brushless

DC motor. The MCT8314Z device integrates three

analog Hall comparators for position sensing to

achieve sensored trapezoidal BLDC motor control.

The control scheme is highly configurable through

hardware pins or registers settings ranging from motor

current limiting behavior to fault response. The speed

can be controlled through a PWM input.

There are a large number of protection features

integrated into the MCT8314Z that are designed to

protect the device, motor, and system against fault

events.

Refer Application Information for design consideration

and recommendation on device usage.