Monolithic Power Systems Inc. MP6543HGL-A-P

Overview

MP6543HGL-A-P from Monolithic Power Systems is a three-phase brushless DC motor power stage IC integrating six N-channel MOSFETs, pre-drivers, gate drive supplies, and bidirectional current-sense amplifiers. It delivers 2A continuous output current at 3V–22V supply, features adjustable over-current protection (4.7–9A range), internal 3.3V/100mA LDO, and supports 100% duty cycle via integrated charge pump. Used in compact BLDC motor control for drones and portable power tools.

For engineers reviewing the MP6543HGL-A-P datasheet, MP6543HGL-A-P pinout, MP6543HGL-A-P application, or MP6543HGL-A-P equivalent, key selection criteria include phase input configuration (HS/LS separate logic), thermal performance in QFN-24 (3mm×4mm), current-sense accuracy (±5% ratio matching), and fault handling (open-drain nFAULT with OCP/UVLO/TSD).

Technical Context

The MP6543HGL-A-P implements independent high-side and low-side gate drive control per phase, enabling precise commutation timing and dead-time management (40ns typical). Its internal charge pump generates VCP = VIN + 3.3V to sustain HS-FET conduction at 100% duty cycle, while automatic synchronous rectification reduces body-diode conduction losses during inductive flyback.

Current sensing is implemented via matched bidirectional amplifiers referenced to VREF, delivering ±250µA output per 1A LS-FET current (1/4000 ratio) with 95–105% positive/negative and phase-to-phase matching. Over-current protection uses an external resistor on OC_ADJ to set thresholds from 4.7A (0Ω) to 9A (floating), with 1µs deglitch and 4ms auto-retry.

Key Specifications

Pinout & Package

MP6543HGL-A-P is housed in a thermally enhanced QFN-24 package (3mm × 4mm) with exposed thermal pad for PCB-level heat dissipation. The package complies with JEDEC MO-220 and supports reflow soldering per IPC/JEDEC J-STD-020.

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-P, MP6543HGL-P simplifies control at the cost of timing flexibility, while TB67B000AHG trades integration for higher voltage tolerance-making MP6543HGL-A-P optimal for space-constrained 12–22V BLDC designs requiring self-contained sensing and regulation.

Availability

MP6543HGL-A-P is available at Aetrix Electronics and suitable for drone propulsion control, cordless power tool motor drives, and industrial fan speed regulation requiring stable component supply across production ramps and long-lifecycle programs.

Supply support for MP6543HGL-A-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 over two decades of expertise in DC-DC conversion, motor drivers, and analog power solutions.

The MP6543H family targets compact, efficient three-phase BLDC motor control in battery-powered and thermally constrained applications, emphasizing integration of gate drive, sensing, protection, and regulation in a single QFN package.

FAQ

What is the function of the OC_ADJ pin on MP6543HGL-A-P?

The OC_ADJ pin sets the over-current protection threshold by connecting an external resistor: 0Ω yields 4.7A minimum trip, while leaving it floating raises the threshold to 5.5A. This resistor configures internal comparator reference voltage without requiring active circuitry or calibration, enabling robust motor stall protection tailored to winding resistance and supply voltage.

How does the MP6543HGL-A-P support 100% duty cycle operation?

It uses an internal charge pump that generates VCP = VIN + 3.3V to maintain sufficient gate-source voltage for high-side N-channel MOSFETs even when the output is held high continuously. A 1µF ceramic capacitor between VCP and VIN stabilizes this supply, allowing full conduction without bootstrap capacitor limitations common in discrete half-bridge drivers.

Can the V3P3 output power an external microcontroller?

Yes - V3P3 delivers a regulated 3.3V at up to 100mA, sufficient for most low-power MCUs (e.g., ARM Cortex-M0+, ESP32-WROOM-32 in deep-sleep mode). A 4.7µF ceramic capacitor to GND is mandatory for stability; total load must stay within 100mA to avoid dropout or thermal derating.

What is the purpose of the nSLEEP pin and its wake-up behavior?

nSLEEP is an active-low input that disables all internal circuitry to reduce quiescent current to 45–60µA. After pulling nSLEEP high, the device requires 1.5ms (power-up delay) before outputs respond to control signals - this interval allows internal regulators and references to stabilize before enabling motor drive.

How are current-sense outputs SOA, SOB, and SOC used in practice?

Each outputs a current proportional to low-side FET current (±250µA per 1A) with polarity indicating direction. Connecting a 5kΩ resistor from SOx to VREF converts this to ±2.5V differential signal compatible with most ADCs. This enables real-time phase current measurement for closed-loop torque control, stall detection, and FOC algorithms without external amplifiers.

Why does MP6543HGL-A-P use separate HS and LS inputs instead of PWM/EN?

Separate HS/LS inputs allow independent timing control of high- and low-side switches per phase - critical for implementing programmable dead time, adaptive commutation, and advanced braking modes (e.g., active freewheeling). This architecture avoids shoot-through risks inherent in EN/PWM schemes and enables finer-grained motor control than the base MP6543H variant.

Is the exposed thermal pad on the QFN-24 package electrically connected?

Yes - the exposed pad is internally connected to GND and must be soldered to a large PCB copper pour tied to the main ground plane. This connection is essential for thermal performance (θJC = 10°C/W) and electrical noise reduction; omitting it degrades current capability and increases junction temperature by >30°C at full load.