Integrated motor driver IC provides complete power solution for BLDC motors

The Monolithic Power Systems MPQ6541 supplies a continuous current to the motor of up to 8 A. Reliable operation is assured by a comprehensive array of protection functions.

The Monolithic Power Systems MPQ6541 and MPQ6541A provide an integrated driver solution for three-phase brushless dc (BLDC) motors. 

The products each consist of three integrated half-bridges implemented with six N-channel power MOSFETs, alongside six pre-drivers, two gate-driver power supplies, and three current-sense amplifiers.

The MPQ6541 has Enable and PWM inputs for each half-bridge; the MPQ6541A has separate high- and low-side inputs. Otherwise, these parts are identical.

These motor drivers can supply up to 12 A of peak current for 1 second, or 8 A of continuous current, depending on the thermal and board-level conditions. An internal charge pump generates the gate-driver supply for the high-side MOSFETs, and a trickle-charge circuit maintains a sufficient gate-driver voltage to operate at 100% duty cycle.

The MPQ6541 and MPQ6541A are supplied in a 6 mm x 6 mm TQFN-26 package. They are available with AEC-Q100 Grade 1 qualification. 

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