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MCT8315Z Sensored Trapezoidal Integrated FET BLDC Motor Driver

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 200-kHz PWM frequency

–Active demagnetization to reduce power losses

•4.5-V to 35-V operating voltage (40-V abs max)

•High output current capability: 4-A Peak

•Low MOSFET on-state resistance

–275-mΩ (typ.) R

DS(ON)

(HS + LS) at T

A

= 25°C

•Low power sleep mode

–2.5-µA (max.) at V

VM

= 24-V, T

A

= 25°C

•Integrated current limiting eliminates external

current sense resistors

•Flexible device configuration options

–MCT8315ZR: 5-MHz 16-bit SPI interface for

device configuration and fault status

–MCT8315ZH: Hardware pin based

configuration with buck

–MCT8315ZT: Hardware pin based configuration

without buck

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

•Built-in 3.3-V/5-V, 200-mA buck regulator

•Built-in 3.3-V, 30-mA LDO regulator

•Delay compensation reduces duty cycle distortion

•Suite of integrated protection features

–Supply undervoltage lockout (UVLO)

–Charge pump undervoltage (CPUV)

–Overcurrent protection (OCP)

–Motor lock protection

–Thermal warning and shutdown (OTW/TSD)

–Fault condition indication pin (nFAULT)

–Optional fault diagnostics over SPI interface

2 Applications

•Brushless-DC (BLDC) Motor Modules

•CPAP machines

•Printers

•Robotic vacuums

•Small home appliances

•Office automation machines

•Factory automation and robotics

3 Description

The MCT8315Z provides a single-chip, code-

free sensored trapezoidal solution for customers

driving 12-V/24-V brushless-DC motors; no external

microcontroller is needed to spin the BLDC motor.

The MCT8315Z integrates three ½ -bridges with 40-

V absolute maximum capability and a low R

DS(ON)

of 275 mΩ (HS+ LS) 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. MCT8315Z provides an output

voltage adjustable buck regulator and an LDO that

can be used to power external circuits. MCT8315Z

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 register settings ranging

from motor current limiting behavior to advance angle.

The speed can be controlled through a PWM input.

A number of protection features including supply

undervoltage lockout (UVLO), overvoltage protection

(OVP), charge pump undervoltage (CPUV),

overcurrent protection (OCP), over-temperature

warning (OTW) and over-temperature shutdown

(TSD) are integrated into MCT8315Z to protect the

device, motor, and system against fault events. Fault

conditions are indicated by the nFAULT pin.

Refer Application Information for design consideration

and recommendation on device usage.

Package Information

PART NUMBERPACKAGE

(1)

PACKAGE SIZE

(2)

MCT8315ZR

(3)

WQFN (32)6 mm x 4 mm

MCT8315ZHWQFN (32)6 mm x 4 mm

MCT8315ZT

(3)

WQFN (32)6 mm x 4 mm

(1)For more information, see Section 13.

(2)The package size (length × width) is a nominal value and

includes pins, where applicable.

(3)Device available for preview only.

DIRECTION

BRAKE

SPI

Only on SPI

variant

PWM input

SPEED

FGOUT

Speed feedback

nFAULT

A

B

C

4.5V to 35V (40V abs max)

4-A peak output current,

typically 12- to 24-V,

Buck out

3.3 or 5.0-V, up to 200-mA

MCT8315Z

MOSFETs

Buck/LDO Regulator

Integrated Current Sensing

Buck/LDO out

H

H

H

Hall inputs support:

Differenal Hall elements

Differenal analog output Hall-effect sensors

Digital output Hall-effect sensors

Single-ended analog output Hall-effect sensors

Sensored

Trap

Control

LDO out

3.3-V, up to 30-mA

Simplified Schematic

MCT8315Z

SLVSH53 – DECEMBER 2023

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

Produktspecifikationer