1 Features

• N-channel H-bridge driver with internal Hall sensor

• RDS(ON): 850mΩ (HS+LS)

• Current rating

– Configurable current limit up to 1.21A

– 0.6A rms (TA = 85oC, RθJA = 100 oC/W)

• Integrated supply (VM) clamp

• Configurable speed curve and starting duty cycle

• Commutation schemes: square or soft (up to 90o)

– Square: maximum torque/speed

– Soft: optimized speed and acoustics

• Configurable speed reference input: PWM or DC

– Input PWM frequency range: 20 Hz to 90 kHz

– Input DC voltage range: (0-3)V

• Configurable output PWM frequency: 25 or 50kHz

• Closed loop speed control accuracy: ±3%

• PWM dithering to reduce EMI

• Configurable soft start time

• Configurable hall offset angle and time

• Speed output with 0.5x, 1x, 2/3x, or 2x multipliers

• Rotor lock detection output (RD)

• Configurable PWM modes

– Synchronous, asynchronous and hybrid

• Auto-demag for high efficiency across speed

• One-time programming (2 pages) over I2C

• Protection features

– Overcurrent protection for short between

VM/GND and OUTx

– Locked rotor protection (LRP) with auto-restart

– VM undervoltage lockout (UVLO)

– VM overvoltage protection (OVP)

– Thermal shutdown (TSD)

– Configurable fault retry time

• Functional features (Opeartion continues)

– when short between FG/RD and GND

– 100% input during short between PWM/DC and

VM

2 Applications

• Appliance cooling fans

• CPU cooling fans

• GPU and console cooling fans

• Blower fans

3 Description

The MC111 is a 25V, 850mΩ rated motor driver

with integrated N-channel full-bridge, charge pump,

Hall sensor, commutation control logic, and protection

circuitry for single phase brushless DC motors. The

Hall sensor provides rotor position information to

the commutation logic to maintain continuous rotor

motion. The commutation logic can be programmed

for square and soft PWM waveforms to reduce

acoustic noise or maximize speed/efficiency.

The duty cycle of a pulse-width modulated signal or

a (0-3)V DC voltage on the PWM/DC pin controls

the motor speed. FG/RD pin can be configured to

report the motor speed or a locked rotor condition to

an external controller. The PWM/DC and FG/RD pins

can be temporarily configured as an I2C interface to

support a programming (OTP) mode to configure the

OTP during production.

The MC111 integrates protection features for

motor and device protection. These include supply

undervoltage lockout, overvoltage protection, output

overcurrent protection, device overtemperature

shutdown, and locked rotor protection.

The MC111 is available in a 6-pin SOT23-FL package.

SOT23-FL is a flat lead package with a maximum

height of 1.1mm.