Monolithic Power Systems Inc. MP6543GL-P

Overview

MP6543GL-P from Monolithic Power Systems is a three-phase brushless DC motor power stage integrating six N-channel MOSFETs, pre-drivers, gate drive supplies, and bidirectional current-sense amplifiers. It delivers 2A continuous output (thermal-PCB dependent), supports 3V–12V input, features adjustable over-current protection (6.2A typ), internal 3.3V/100mA LDO, and operates in EN/PWM control mode. Used in compact BLDC motor drives for drones, power tools, and HVAC blowers.

For engineers reviewing the MP6543GL-P datasheet, MP6543GL-P pinout, MP6543GL-P application, or MP6543GL-P equivalent, key selection considerations include its QFN-24 (3mm×4mm) package with exposed thermal pad, 110mΩ HS/105mΩ LS on-resistance, 100% duty-cycle support via charge pump, synchronous rectification, and integrated fault reporting via open-drain nFAULT.

Technical Context

The MP6543GL-P implements three independent half-bridge drivers with logic-controlled enable (ENA/ENB/ENC) and PWM inputs per phase, supporting high-impedance disable states and precise commutation timing. Its internal charge pump generates VCP = VIN + 3.3V to sustain high-side gate drive at 100% duty cycle, while trickle-charge maintains voltage under sustained conduction.

Current sensing is implemented per phase using matched bidirectional amplifiers referenced to VREF (3.3V), delivering ±250µA output per 1A LS-FET current (1/4000 A/A ratio), with <5% gain mismatch across phases and temperature. Fault handling includes latched OCP (70ns deglitch), UVLO (2.7V threshold), thermal shutdown (160°C), and open-drain nFAULT signaling.

Key Specifications

Pinout & Package

MP6543GL-P uses a thermally enhanced QFN-24 (3mm × 4mm) package with exposed thermal pad for PCB-level heat dissipation. Pin numbering follows standard JEDEC MO-220 outline with Pin 1 index marker.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP6543AGL-P and MP6543BGL-P, the MP6543GL-P offers the simplest control interface (enable + PWM per phase), making it optimal for firmware-light MCU implementations and rapid prototyping, whereas the A and B variants trade interface simplicity for specialized timing or sensor integration.

Availability

MP6543GL-P is available at Aetrix Electronics and suitable for power tool motor drives, HVAC blower control, drone propulsion systems, and industrial fan controllers requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for MP6543GL-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, including DC/DC converters, motor drivers, and LED drivers, with global manufacturing and quality certifications.

The MP6543 family belongs to MPS's integrated motor driver product line, designed specifically for compact, efficient three-phase BLDC power stages in battery-powered and 12V industrial equipment where thermal density, integration, and fault resilience are critical.

FAQ

What is the maximum continuous output current of the MP6543GL-P?

The MP6543GL-P delivers up to 2A continuous output current per phase under typical thermal conditions (θJA = 48°C/W, TA = 25°C, adequate PCB copper). Actual current depends on layout, ambient temperature, and airflow; derating is required above 85°C ambient or with limited copper area.

How does the MP6543GL-P support 100% duty cycle operation?

It uses an internal charge pump generating VCP = VIN + 3.3V to maintain high-side gate drive voltage, plus a trickle-charge circuit that replenishes charge during sustained conduction-eliminating reliance on external bootstrap components and enabling true 100% duty cycle without voltage droop.

Can the MP6543GL-P be used without an external microcontroller?

No-it requires external logic (e.g., MCU or FPGA) to generate ENA/ENB/ENC and PWMA/PWMB/PWMC signals. It has no internal commutation logic, timer, or Hall decoding; it functions strictly as a gate driver and current-sense interface, not a standalone motor controller.

What is the purpose of the OC_ADJ pin, and how is it configured?

OC_ADJ sets the over-current protection threshold: grounding it selects 6.2A (typ), leaving it floating selects 7.2A (typ). No resistor is required-only connection state matters. This allows simple hardware-selectable OCP levels without trimming components or firmware changes.

Does the MP6543GL-P include reverse-voltage or shoot-through protection?

It includes built-in shoot-through prevention via fixed 40ns dead time between HS and LS FET switching. Reverse-voltage protection is not integrated; VIN must remain ≥0V. External TVS or reverse-polarity protection is required if system-level reverse-battery risk exists.

Is the V3P3 LDO output capable of powering a typical 3.3V microcontroller?

Yes-the 3.3V/100mA LDO can power most low-to-mid complexity MCUs (e.g., ARM Cortex-M0+, ESP32 in deep sleep, PIC18). For higher-current MCUs or peripherals, verify total load stays ≤100mA and use ≥0.47µF ceramic bypass at the V3P3 pin to ensure stability.

How is thermal performance affected by the exposed pad connection?

The exposed thermal pad must be soldered to a minimum 100mm² copper pour with ≥4 thermal vias (0.3mm diameter) to internal ground planes. Without this, θJA degrades from 48°C/W to >75°C/W, limiting continuous current to <1.2A and increasing risk of thermal shutdown.