Monolithic Power Systems Inc. MP6543GL-Z

Overview

MP6543GL-Z from Monolithic Power Systems is a three-phase brushless DC motor power stage IC integrating six N-channel MOSFETs (110 mΩ HS, 105 mΩ LS), gate drivers, charge pump, 3.3V/100mA LDO, and bidirectional current-sense amplifiers. It delivers 2A continuous output per phase at 3–12V supply, supports 100% duty cycle via internal charge pump, and targets compact BLDC motor control in drones, cooling fans, and portable power tools.

For engineers reviewing the MP6543GL-Z datasheet, MP6543GL-Z pinout, MP6543GL-Z application, or MP6543GL-Z equivalent, key selection considerations include its EN/PWM input logic mode, adjustable over-current threshold (5.5–9 A), thermal shutdown (160°C), UVLO (2.7 V), and QFN-24 (3mm×4mm) package with exposed thermal pad for high-power density designs.

Technical Context

The MP6543GL-Z implements independent enable-and-PWM control per half-bridge, with automatic synchronous rectification to minimize body-diode conduction loss during inductive flyback. Its integrated current-sense amplifiers provide ±1A sensing with 1/4000 A/A ratio and <5% phase-to-phase matching across temperature.

Internal protection includes latchable over-current detection (deglitch time = 1 µs), under-voltage lockout with 150 mV hysteresis, and thermal shutdown with 25°C hysteresis. The charge pump generates VCP = VIN + 3.3 V to sustain high-side gate drive at 100% duty cycle, while the 3.3V LDO powers external MCU peripherals.

Key Specifications

Pinout & Package

MP6543GL-Z uses a thermally enhanced QFN-24 (3 mm × 4 mm) package with exposed thermal pad, optimized for motor drive thermal dissipation. Pin functions align with MP6543 variant (ENA/ENB/ENC and PWMA/PWMB/PWMC inputs).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP6543AGL-Z and MP6543BGL-Z, the MP6543GL-Z offers the most flexible interface for general-purpose PWM-driven BLDC control, balancing ease of MCU integration with full half-bridge autonomy-making it optimal for variable-speed, software-defined motor applications.

Availability

MP6543GL-Z is available at Aetrix Electronics and suitable for drone propulsion systems, server cooling fans, and cordless power tools requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP6543GL-Z 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 expertise in DC/DC converters, motor drivers, and integrated power stages.

The MP6543 family belongs to MPS's BLDC motor driver product line, engineered for compact, thermally efficient three-phase power stages in space-constrained, battery-powered, and thermally demanding applications.

FAQ

What is the maximum continuous current rating of the MP6543GL-Z?

The MP6543GL-Z delivers 2 A continuous output current per phase under typical thermal conditions (2-layer PCB with 2 oz copper, 200 mm² thermal pad area, 200 LFM airflow). Actual current depends on PCB layout, ambient temperature, and heatsinking-derate to 1.5 A for sealed enclosures above 70°C ambient.

Does the MP6543GL-Z require external bootstrap capacitors?

No. The MP6543GL-Z integrates an internal charge pump that generates VCP = VIN + 3.3 V, eliminating external bootstrap diodes and capacitors. Only a single 1 µF ceramic capacitor between VCP and VIN is required to stabilize the charge pump output.

How does the current-sense amplifier interface with an MCU ADC?

The SOA/SOB/SOC pins output bidirectional current (±250 µA per ±1 A phase current) referenced to VREF. Use a precision 5 kΩ termination resistor to convert to ±1.25 V differential swing, or connect to an ADC with ratiometric reference using two equal resistors to VDD_ADC and GND for zero-current mid-scale alignment.

What happens during an over-current event?

When sensed current exceeds the programmed OCP threshold for longer than 1 µs, all six MOSFETs disable, outputs go high-impedance, and nFAULT pulls low. The fault is latched until VIN is cycled or nSLEEP is toggled-preventing automatic recovery during persistent faults.

Can the MP6543GL-Z drive a delta-connected BLDC motor?

Yes. The SA/SB/SC outputs are fully independent high-impedance nodes capable of driving star- or delta-configured windings. Delta connection increases phase voltage but reduces phase current-ensure motor phase resistance and inductance remain within the 2 A/12 V operating envelope and thermal limits.

Is the 3.3V LDO output regulated under load variation?

Yes. The V3P3 output maintains 3.3 V ±3.5% from 0 to 100 mA load across -40°C to +125°C, with <10 mV load regulation error. A minimum 0.47 µF ceramic bypass capacitor is mandatory; adding a 4.7 µF bulk capacitor improves transient response for pulsed MCU loads.

What is the purpose of the dual LSS pins (pins 8 and 12)?

Pins 8 and 12 are electrically connected internally and serve as the common low-side source node for all three phases. They must be tied together and connected directly to the main system ground plane with low-inductance, wide copper traces to minimize ground bounce and ensure accurate current sensing and thermal performance.