Monolithic Power Systems Inc. MP6543BGL-P

Overview

MP6543BGL-P from Monolithic Power Systems is a three-phase brushless DC motor power stage integrating six N-channel MOSFETs, gate drivers, current-sense amplifiers, and a 3.3V/100mA LDO. It delivers 2A continuous output per phase at 3–12V supply, supports 100% duty cycle via internal charge pump, and accepts Hall-sensor inputs (HA/HB/HC) for sensor-based commutation in BLDC motor control systems used in drones, HVAC blowers, and industrial fans.

For engineers reviewing the MP6543BGL-P datasheet, MP6543BGL-P pinout, MP6543BGL-P application, or MP6543BGL-P equivalent, key selection considerations include Hall-input logic compatibility, integrated bidirectional current sensing (SOA/SOB/SOC), adjustable over-current protection (OC_ADJ), thermal shutdown (160°C), and QFN-24 (3mm×4mm) package with exposed thermal pad for motor drive thermal management.

Technical Context

The MP6543B implements Hall-sensor-driven six-step commutation using three 120°-spaced digital inputs (HA/HB/HC), with DIR and nBRAKE controlling torque direction and active braking. Its synchronous rectification logic monitors Sx node voltage to autonomously enable LS-FETs during negative recirculation or HS-FETs during positive flyback, minimizing body-diode conduction loss.

Current sensing is implemented per-phase on low-side FETs only, with SOA/SOB/SOC sourcing/sinking current proportional to load current (typical ratio 1/4000 A/A), referenced to VREF (3.3V). OCP uses internal comparators with deglitch timing (1µs) and latched shutdown until nSLEEP reset or VIN cycle.

Key Specifications

Pinout & Package

MP6543BGL-P uses a thermally enhanced QFN-24 (3mm × 4mm) package with exposed thermal pad, optimized for motor drive PCB layout and heat dissipation. Pin functions are specific to MP6543B variant and validated per datasheet Rev. 1.01.

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, MP6543BGL-P trades independent FET control for simplified Hall-based commutation; versus TB6605FTG, it offers higher integration (LDO, current sense, charge pump) in a smaller QFN but lower current headroom.

Availability

MP6543BGL-P is available at Aetrix Electronics and suitable for drone propulsion systems, HVAC blower modules, and industrial fan controllers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP6543BGL-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 drivers.

The MP6543 family targets cost-sensitive, space-constrained BLDC motor applications where integration of gate drivers, sensing, and protection reduces system component count and improves reliability.

FAQ

What Hall-sensor voltage levels are compatible with MP6543BGL-P inputs HA/HB/HC?

HA, HB, and HC accept standard digital logic levels: VIH ≥ 1.5V and VIL ≤ 0.4V at TA = 25°C. The inputs have internal 500kΩ pull-down resistors, enabling direct connection to open-collector Hall sensors without external biasing. Input current remains within ±20µA across the valid range, ensuring compatibility with most 3.3V or 5V Hall-effect devices.

How does the MP6543BGL-P implement automatic synchronous rectification?

The device continuously monitors each phase output voltage (SA/SB/SC) relative to GND and VIN. When SA drops below GND during inductive flyback, the LS-FET for phase A turns on until current decays to zero or the HS-FET is commanded on. Similarly, if SA rises above VIN, the HS-FET activates. This replaces lossy body-diode conduction with controlled FET switching, reducing power dissipation.

Can the integrated 3.3V LDO power an external microcontroller?

Yes - the V3P3 pin delivers up to 100mA at 3.3V ±3%, with output voltage stable across -40°C to +125°C junction temperature. A 0.47µF ceramic capacitor must be placed between V3P3 and GND. For loads exceeding 100mA or requiring tighter regulation, an external LDO is recommended.

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

OC_ADJ sets the over-current protection threshold by connecting a resistor to GND. A 0Ω resistor yields 6.2A typical trip; leaving the pin floating yields 7.2A. Values outside this range are not specified. The OCP circuit disables all six FETs and asserts nFAULT when sensed current exceeds the threshold for longer than 1µs, latching until nSLEEP is toggled or VIN is cycled.

Does MP6543BGL-P support 100% duty cycle operation, and what external components are required?

Yes - the internal charge pump generates VCP = VIN + 3.3V, enabling full enhancement of high-side FETs without bootstrap limitations. A 1µF X7R ceramic capacitor rated for ≥10V must be placed between VCP and VIN. This configuration maintains gate drive during continuous conduction, critical for applications like electronic braking or zero-speed torque hold.

How does the current-sense amplifier function and what is its accuracy?

Each SOA/SOB/SOC pin sources or sinks current proportional to low-side FET current, with a nominal ratio of 1/4000 A/A (250µA at 1A). Positive and negative current matching is ±5%, and phase-to-phase matching is also ±5%. The output swings from 0V to 3.6V, referenced to VREF (3.3V), enabling direct interfacing with 3.3V-ratiometric ADCs using simple resistor dividers.

What thermal management considerations apply to the QFN-24 package?

The QFN-24 (3mm × 4mm) package features an exposed thermal pad that must be soldered to a large PCB copper pour for effective heat transfer. With θJA = 48°C/W on a 4-layer board, 2A continuous operation requires adequate copper area and airflow to maintain TJ < 125°C. Thermal shutdown triggers at 160°C with 25°C hysteresis, allowing safe recovery after transient overload.