Monolithic Power Systems Inc. MP6543HGL-A-Z

Overview

MP6543HGL-A-Z from Monolithic Power Systems is a three-phase brushless DC motor power stage IC integrating six N-channel MOSFETs (110mΩ HS / 105mΩ LS), gate drivers, charge pump, 3.3V/100mA LDO, and bidirectional current-sense amplifiers. It delivers 2A continuous output current with adjustable over-current protection (OCP threshold 5.5–9A), supports 100% duty cycle via internal charge pump, and operates from 3V to 22V input supply. Used in compact BLDC motor control for drones and portable power tools.

For engineers reviewing the MP6543HGL-A-Z datasheet, MP6543HGL-A-Z pinout, MP6543HGL-A-Z application, or MP6543HGL-A-Z equivalent, key selection criteria include phase-input logic mode (HS/LS separate), thermal performance in QFN-24 (3mm×4mm), OCP threshold configurability via OC_ADJ, and integrated current sensing with ±105% matching across phases.

Technical Context

The MP6543HGL-A-Z implements independent high-side and low-side logic inputs per phase (HSx/LSx), enabling precise commutation control without external logic translation. Its internal charge pump generates VCP = VIN + 3.3V to sustain high-side gate drive at 100% duty cycle, while automatic synchronous rectification reduces body-diode conduction loss during inductive flyback.

Current sensing is implemented via matched bidirectional amplifiers referenced to VREF, delivering SOA/SOB/SOC outputs proportional to low-side FET current (1/4000 A/A typical) with ±5% full-scale error and 95–105% positive/negative matching. Fault management includes UVLO (2.7V typ), thermal shutdown (160°C), and deglitched OCP (1µs) with auto-retry (4ms).

Key Specifications

Pinout & Package

MP6543HGL-A-Z uses a thermally enhanced QFN-24 (3mm × 4mm) package with exposed thermal pad for PCB-level heat dissipation. Pin numbering follows 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-Z, MP6542HGL-Z reduces integration (no LDO, lower current) but maintains pin compatibility for drop-in derating, while TBD62783AFG,EL trades integration for serviceability and higher current headroom at the cost of increased component count and layout complexity.

Availability

MP6543HGL-A-Z is available at Aetrix Electronics and suitable for drone propulsion systems, portable power tools, industrial HVAC blowers, and medical infusion pumps requiring stable component supply and long-term production continuity.

Supply support for MP6543HGL-A-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 over 20 years of expertise in DC/DC converters, motor drivers, and LED controllers.

The MP6543H family targets compact, high-efficiency BLDC motor control in space-constrained applications, emphasizing integration of gate drivers, sensing, protection, and regulation into a single QFN package.

FAQ

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

The OC_ADJ pin configures the over-current protection threshold by connecting an external resistor: 0Ω sets 5.5A minimum trip point, while leaving it floating selects 9A. This hardware-based adjustment ensures deterministic fault response independent of MCU firmware, critical for safety-critical motor control where software latency is unacceptable.

Can MP6543HGL-A-Z operate with a 24V supply?

No. The absolute maximum VIN rating is +25V, but recommended operating voltage is limited to 22V. At 24V, internal UVLO hysteresis (2.7V ±0.15V) and charge pump stress exceed design margins, risking premature thermal shutdown or reduced reliability. Derate to ≤22V for continuous operation with margin.

How does the nSLEEP pin affect current-sense outputs?

When nSLEEP is asserted low, all internal circuitry-including current-sense amplifiers-is disabled. SOA/SOB/SOC outputs become high-impedance and cease delivering valid signals. Wake-up requires 1.5ms stabilization before current sensing resumes, making nSLEEP unsuitable for dynamic current monitoring during sleep transitions.

Is the V3P3 output capable of powering an external microcontroller?

Yes. V3P3 delivers a regulated 3.3V ±3% output with 100mA continuous capability. To ensure stability under dynamic load, a minimum 4.7µF X5R/X7R ceramic capacitor must be placed between V3P3 and GND. This eliminates need for external LDO in most BLDC control subsystems.

What is the purpose of the LSS pin and how must it be connected?

LSS is the common source node for all three low-side MOSFETs and must be connected directly to PCB ground plane with minimal trace inductance. It serves as the reference for current sensing and gate drive return path; routing through vias or narrow traces increases switching noise and degrades OCP accuracy.

Does MP6543HGL-A-Z support sinusoidal (FOC) commutation?

Yes. Its independent HS/LS inputs, matched current-sense outputs (±5% gain error), and <40ns dead-time control enable implementation of field-oriented control (FOC) algorithms. However, external MCU or dedicated FOC controller is required to generate the six PWM signals and execute Clarke/Park transforms.

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 rises from 48°C/W to >75°C/W, causing junction temperature to exceed 125°C at just 1.2A continuous load-triggering thermal shutdown.