Electronic Component Solutions

50V, 5A, Three-Phase Brushless DC Motor Drivers

The MP6540H and MP6540HA from Monolithic Power Systems are three-phase brushless dc motor drivers. These devices integrate three half-bridges consisting of six N-channel power MOSFETs, pre-drivers, gate drive power supplies, and current-sense amplifiers.

The MP6540H has enable (EN) and PWM inputs for each half-bridge, while the MP6540HA has separate high-side and low-side inputs. Otherwise, both parts are identical.
The MP6540H/HA can deliver up to 6A of peak current and 5A of continuous output current, based on thermal and PCB conditions. The MP6540H/HA uses an internal charge pump to generate the gate drive supply voltage for the high-side MOSFETs, and a trickle charge circuit that maintains sufficient gate drive voltage to operate at 100% duty cycle.
Internal safety features include thermal shutdown, under-voltage lockout (UVLO), and over-current protection (OCP).
The MP6540H/HA are available in a QFN-26 (5mm x 5mm) package.

  • 5V to 50V Operating Supply Voltage
  • 5A Output Current/6A Peak Current
  • Low RDS(ON): HS + LS 50mΩ
  • PWM & ENBL inputs
  • Internal Charge Pump Supports 100% Duty Cycle Operation
  • Integrated Bidirectional Current-Sense Amplifiers
  • Automatic Synchronous Rectification
  • Full integration eliminates external FETs and reduces solution size
  • Internal current sense
  • Lower solution cost

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