1 Features

• Three-phase BLDC motor driver with integrated

sensorless motor control algorithm

– Code-free Field Oriented Control (FOC)

– Analog, PWM and freq. based speed input

modes: available only when MCF8315A is

configured as a standby device (DEV_MODE

= 0b)

– I2C based speed input mode: available in both

sleep (DEV_MODE = 1b) and standby devices

(DEV_MODE = 0b).

– Offline motor parameters measurement with

Motor Parameter Extraction Tool (MPET)

– 5-point configurable speed profile support

– Windmilling support through forward

resynchronization and reverse drive

– Anti-voltage surge (AVS) protection

– Improved acoustic performance with automatic

dead time compensation

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

• High output current capability: 4-A peak

• Low MOSFET on-state resistance

– RDS(ON) (HS + LS) at TA = 25°C : 240-mΩ (typ.)

• Low power sleep mode: Refer Table 7-6

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

• Speed loop accuracy: 3 with internal clock and

1 with external clock reference

• Supports up to 75-kHz PWM frequency for low

inductance motor support

• Does not require external current sense resistors;

uses built-in current sensing

• Built-in 3.3-V, 20-mA LDO regulator

• Built-in 3.3-V/5-V, 170-mA buck regulator

• Dedicated DRVOFF pin to disable (Hi-Z) outputs

• Spread spectrum and slew rate for EMI mitigation

• Suite of integrated protection features

– Supply under voltage lockout (UVLO)

– Supply over voltage protection (OVP)

– Motor lock detection (5 different types)

– Over current protection (OCP)

– Thermal warning and shutdown (OTW/TSD)

– Fault condition indication pin (nFAULT)

– Optional fault diagnostics over I2C interface

2 Applications

• Brushless-DC (BLDC) Motor Modules

• Residential and Living Fans

• Air Purifiers and Humidifier Fans

• Washer and Dishwashers Pumps

• Automotive Fan and Blowers

• CPAP Machines

3 Description

The MCF8315A provides a single-chip, code-free

sensorless FOC solution for customers driving speedcontrolled

12- to 24-V brushless-DC motors (BLDC)

or Permanent Magnet Synchronous motor (PMSM) up

to 4-A peak current. The MCF8315A integrates three

½-bridges with 40-V absolute maximum capability and

a low RDS(ON) of 240 mΩ (high-side + low-side FETs).

MCF8315A integrates power management circuits

including an voltage-adjustable buck regulator (3.3 V /

5 V, 170-mA) and LDO (3.3 V / 20 mA) that can be

used to power external circuits.

The FOC algorithm configuration can be stored in

non-volatile EEPROM, which allows the device to

operate stand-alone once it has been configured.

The device receives a speed command through a

PWM input, analog voltage, variable frequency square

wave or I2C command. There are a large number

of protection features integrated into the MCF8315A,

intended to protect the device, motor, and system

against fault events.