Monolithic Power Systems Inc. MP6543HGL-P

Overview

MP6543HGL-P from Monolithic Power Systems is a three-phase brushless DC motor power stage integrating six N-channel MOSFETs, pre-drivers, gate drive power supplies, and bidirectional current-sense amplifiers. It delivers 2A continuous output current at up to 22V supply, features adjustable over-current protection (OCP), internal charge pump for 100% duty-cycle operation, and integrated 3.3V/100mA LDO - used in compact BLDC motor control systems for drones, power tools, and HVAC blowers.

For engineers reviewing the MP6543HGL-P datasheet, MP6543HGL-P pinout, MP6543HGL-P application, or MP6543HGL-P equivalent, key selection considerations include its QFN-24 (3mm×4mm) thermal pad package, EN/PWM input logic mode, 110mΩ HS-FET on-resistance, synchronous rectification behavior, and configurable OCP threshold via OC_ADJ.

Technical Context

The MP6543HGL-P implements three independent half-bridge drivers with matched high-side and low-side gate control logic, supporting EN/PWM input mode (distinct from HS/LS or Hall-input variants). Its internal charge pump generates VCP = VIN + 3.3V to sustain high-side FET conduction at 100% duty cycle, while automatic synchronous rectification actively commutates recirculating inductive current through LS-FETs instead of body diodes.

Current sensing is implemented per-phase using integrated amplifiers with 1/4000 A/A ratio, sourcing/sinking proportional current into SOA/SOB/SOC pins - requiring external RREF termination to generate voltage signals for MCU ADCs. Fault management includes UVLO (2.7V threshold), thermal shutdown (160°C), and deglitched OCP (1µs blanking, 4ms retry).

Key Specifications

Pinout & Package

MP6543HGL-P is housed in a thermally enhanced QFN-24 (3mm × 4mm) package with exposed thermal pad for PCB-level heat dissipation. Pin numbering follows standard top-view orientation with Pin 1 marked by index area.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP6543HGL-A and MP6543HGL-B, the MP6543HGL-P provides the most direct EN/PWM interface for microcontroller-based sinusoidal or trapezoidal control, offering lowest software overhead and fastest PWM-to-output latency - ideal for closed-loop torque or velocity algorithms requiring minimal gate-driver abstraction.

Availability

MP6543HGL-P is available at Aetrix Electronics and suitable for drone propulsion, cordless power tools, HVAC blowers, and industrial fan control requiring stable component supply and consistent thermal performance across production volumes.

Supply support for MP6543HGL-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 expertise in DC/DC converters, motor drivers, and LED controllers since 1997.

The MP6543H family belongs to MPS's integrated motor driver product line, designed specifically for compact, thermally efficient three-phase BLDC power stages in consumer, industrial, and automotive-qualified applications.

FAQ

What is the maximum continuous current rating for MP6543HGL-P under standard PCB conditions?

The MP6543HGL-P delivers 2A continuous current per phase when mounted on a 4-layer PCB with adequate copper pour and thermal vias to the exposed pad. This rating assumes ambient temperature of 25°C and junction temperature limited to 125°C, based on θJA = 48°C/W. Derating is required above 60°C ambient.

How does the OC_ADJ pin configure over-current protection threshold?

OC_ADJ sets OCP threshold via external resistor: 0Ω yields 4.7A minimum trip, floating yields 5.5A minimum. The internal comparator compares sensed LS-FET current against this reference. No external op-amp or comparator is needed - configuration is purely resistive and monotonic.

Can MP6543HGL-P operate with 100% duty cycle on the high-side FETs?

Yes. Its integrated charge pump generates VCP = VIN + 3.3V, sustaining gate voltage above source potential even when SA/SB/SC are driven to VIN. This eliminates bootstrap capacitor limitations and enables true 100% high-side conduction - essential for applications like active braking or zero-speed torque hold.

What is the function of the V3P3 pin and what load can it drive?

V3P3 is the output of an internal 3.3V LDO rated for 100mA continuous current. It powers external low-power circuitry such as microcontrollers, Hall sensors, or level shifters. A minimum 4.7µF ceramic capacitor must be placed between V3P3 and GND to ensure regulation stability under dynamic load.

How does automatic synchronous rectification improve efficiency?

During inductive flyback, the MP6543HGL-P detects negative voltage at SA/SB/SC and actively turns on the corresponding LS-FET - replacing body-diode conduction (≈0.7V drop) with R_DS(on) conduction (≈0.1V drop at 2A). This reduces recirculation loss by >60%, lowering die temperature and improving overall system efficiency.

Is the nFAULT pin compatible with 3.3V or 5V logic systems?

Yes. nFAULT is an open-drain output with no internal pull-up; it requires an external pull-up resistor to the host system's logic rail (3.3V or 5V). The pin sinks current when faults occur (UVLO, OCP, thermal shutdown), allowing direct interfacing with either voltage domain without level shifting.

What thermal management practices are recommended for QFN-24 layout?

Use ≥6 thermal vias (0.3mm diameter, filled or capped) under the exposed pad, connecting to a solid inner-layer ground plane. Maintain ≥1.5mm copper clearance around the pad for solder paste stencil accuracy. Avoid routing signal traces beneath the pad to preserve thermal path integrity.