1 Features
• Three-phase BLDC motor driver with integrated
sensorless motor control algorithm
– Code-free high speed Trapezoidal Control
– Supports up to 3 kHz (electrical frequency)
– Very fast start-up time (< 50 ms)
– Fast Deceleration (< 150 ms)
– Supports 120° or 150° modulation to improve
acoustic performance
– Windmilling support through forward
resynchronization and reverse drive
– Analog, PWM, freq. or I2C based speed input
– Active Demagnetization to reduce power losses
– Configurable motor start-up and stop options
– Closed speed/power loop options
– Anti-voltage surge (AVS) protection prevents
DC bus voltage spike during motor deceleration
• 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
– 5-μA (maximum) at VVM = 24-V, TA = 25°C
• Speed loop accuracy: 3% with internal clock and
1% with external clock reference
• Customer-configurable non-volatile memory
(EEPROM) to store device configuration
• Supports up to 100-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
• Robotic Vacuum Suction Motors
• Motor Cycle Fuel Pumps
• Appliance Fans and Pumps
• Automotive Fan and Blowers
• CPAP Machines

3 Description
The MCT8315A provides a single-chip, codefree
sensorless trapezoidal solution for customers
requiring high speed operation (up to 3 kHz electrical)
or very fast start-up time (< 50 ms) for 12- to 24-V
brushless-DC motors requiring up to 4-A peak current.
The MCT8315A integrates three ½-bridges with 40-
V absolute maximum capability and a low RDS(ON)
of 240 mΩ (high-side + low-side FETs). MCT8315A
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.
Sensorless trapezoidal control is highly configurable
(motor start-up/stop behavior, fault handling, closed
loop operation) through register settings in a nonvolatile
EEPROM, which allows the device to operate
stand-alone once it has been configured. The
MCT8315A receives a speed command through
a PWM signal, analog voltage, variable frequency
square wave or I2C instruction. There are a large
number of protection features integrated into the
MCT8315A to protect the device, motor, and system
against fault events.