Monolithic Power Systems Inc. MP6540AGU-P

Overview

MP6540AGU-P from Monolithic Power Systems is a 3-phase brushless DC motor driver IC integrating six N-channel MOSFETs, pre-drivers, charge-pump gate drive supplies, and bidirectional current sense amplifiers. It delivers 3A continuous / 10A peak output across 5.5V–35V input, supports 100% duty cycle via internal charge pump, and features UVLO, thermal shutdown, and over-current protection. Used in compact BLDC motor control for HVAC blowers and power tools.

For engineers reviewing the MP6540AGU-P datasheet, MP6540AGU-P pinout, MP6540AGU-P application, or MP6540AGU-P equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and current-sense performance, and real-world motor control implementation guidance - not generic timing or power-switching descriptions.

Technical Context

The MP6540AGU-P implements three independent half-bridge drivers with separate high-side (HSA/HSB/HSC) and low-side (LSA/LSB/LSC) logic inputs per phase, enabling precise synchronous rectification and dead-time control. Its integrated charge pump generates ~VIN+5.5V gate drive for high-side MOSFETs, while an internal LDO supplies 5.5V to low-side gates via the VG pin.

Current sensing is implemented per phase using matched internal amplifiers with 1/9200 typical current-to-output ratio (±3A range), referenced to VREF and terminated externally for ADC interfacing. Fault management includes open-drain nFAULT signaling with 27Ω on-resistance, 0.4µs OCP deglitch, and 10ms auto-retry after over-current or thermal shutdown events.

Key Specifications

Pinout & Package

MP6540AGU-P is housed in a thermally enhanced FCQFN-26 package (5.0mm × 5.0mm, 0.5mm pitch) with exposed thermal pad. The package supports high-power dissipation (θJA = 22.4°C/W on 4-layer PCB) and requires solder paste stencil optimization for the bottom paddle.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar three-phase BLDC gate driver applications.

Compared with MP6540AGU-P, MP6530AGU-Z reduces integration at the cost of sensing flexibility, while TMC6300-LA trades voltage/current headroom for embedded control features - making MP6540AGU-P optimal for analog-feedback BLDC systems needing 24V compatibility and minimal external components.

Availability

MP6540AGU-P is available at Aetrix Electronics and suitable for HVAC blower modules, cordless power tool motor controllers, and industrial PMSM drives requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for MP6540AGU-P includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance power management ICs, with design centers in the US, China, and Taiwan, and global distribution through authorized partners.

The MP6540A product line targets compact, high-efficiency three-phase motor control in space-constrained applications - delivering integrated gate drive, sensing, and protection without external discrete components.

FAQ

What is the difference between MP6540 and MP6540A?

The MP6540AGU-P uses separate high-side (HSA/HSB/HSC) and low-side (LSA/LSB/LSC) logic inputs per phase, enabling independent FET control for advanced commutation schemes. The MP6540 uses PWM/EN inputs and shares control logic - both share identical MOSFETs, current sense, protection, and package. Pinouts differ accordingly.

Does MP6540AGU-P support 100% duty cycle operation?

Yes. Its internal charge pump generates ~VIN+5.5V gate drive for high-side MOSFETs and includes a trickle-charge circuit that maintains sufficient voltage during 100% duty cycle, verified per datasheet Figure 1 and Electrical Characteristics table (VCP = VIN + 5.5V).

How is current sensing implemented on MP6540AGU-P?

Each phase has a dedicated current sense amplifier measuring low-side FET current only, with 1/9200 typical ratio (±3A range). Output is a current source (114µA per 1A) requiring external termination resistor (RTERM) to convert to voltage for MCU ADC input, per Equation (1) in datasheet Section 11.

What thermal derating applies to the 3A continuous rating?

The 3A continuous rating assumes θJA = 22.4°C/W on a 4-layer PCB with adequate copper pour. At 125°C max junction temperature and 25°C ambient, maximum allowable power dissipation is 3.47W. With 50mΩ total RDS(on), 3A yields 450mW per phase - well within thermal limit when PCB layout follows MPS AN-107 guidelines.

Can MP6540AGU-P be used with sensorless BLDC control?

Yes. Its precise current sense outputs (SOA/SOB/SOC) and fast OCP response (0.4µs deglitch) support back-EMF zero-crossing detection and observer-based FOC algorithms. The 10A peak rating accommodates startup currents, and nFAULT provides reliable jam detection for safety-critical operation.

What external capacitors are mandatory for MP6540AGU-P?

Four capacitors are required: 4.7µF X7R (10V) from VG to GND; 1µF X7R (10V) from VCP to VIN; 100nF X7R (≥VIN-rated) between CP1 and CP2; and local 10µF ceramic at VIN. All values and ratings are specified in datasheet Table 3 and Section 13.

Is MP6540AGU-P RoHS-compliant and halogen-free?

Yes. Per datasheet page 2, all MPS parts including MP6540AGU-P are lead-free, halogen-free, and fully compliant with the RoHS directive. Green status documentation is available on the MPS Quality Assurance webpage.