Monolithic Power Systems Inc. MP6543HGL-B-P

Overview

MP6543HGL-B-P from Monolithic Power Systems is a three-phase brushless DC motor power stage IC integrating six N-channel MOSFETs, pre-drivers, charge pump, 3.3V/100mA LDO, and bidirectional current-sense amplifiers. It supports Hall-effect sensor commutation (via HA/HB/HC inputs), delivers 2A continuous output per phase, features adjustable over-current protection (4.7–9A range), and operates from 3V to 22V supply. Used in compact BLDC motor control for drones, cooling fans, and precision motion systems.

For engineers reviewing the MP6543HGL-B-P datasheet, MP6543HGL-B-P pinout, MP6543HGL-B-P application, or MP6543HGL-B-P equivalent, key selection criteria include Hall-input timing compatibility, 100% duty-cycle support via internal charge pump, QFN-24 thermal pad layout, and OCP threshold configurability via OC_ADJ resistor.

Technical Context

The MP6543HGL-B-P implements Hall-based six-step commutation logic with DIR and nBRAKE control inputs, enabling precise rotor position–driven switching without external microcontroller timing intervention. Its integrated current-sense amplifiers provide ±100mA to ±1A sensing with 1/4000 ratio and <5% phase-to-phase matching error, directly feeding ADCs via SOA/SOB/SOC outputs referenced to VREF.

It uses an internal charge pump generating 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. Thermal shutdown (160°C) and UVLO (2.7V typical) operate independently of control logic to ensure fail-safe motor disable.

Key Specifications

Pinout & Package

MP6543HGL-B-P is housed in a thermally enhanced QFN-24 (3mm × 4mm) package with exposed thermal pad, requiring solder paste stencil design per JEDEC MO-220 and 4-layer PCB copper pour for θ_JA = 48°C/W.

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, the MP6543HGL-B-P trades pin-level gate control flexibility for plug-and-play Hall commutation, reducing firmware complexity. Against TMC6300-LA, it offers lower conduction loss and smaller footprint but lacks digital interface and advanced current regulation.

Availability

MP6543HGL-B-P is available at Aetrix Electronics and suitable for drone propulsion systems, server cooling fans, medical infusion pumps, and industrial HVAC blowers requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.

Supply support for MP6543HGL-B-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 converters, motor drivers, and battery management solutions.

The MP6543H family targets cost-sensitive, space-constrained BLDC motor applications where integrated Hall commutation, thermal efficiency, and system-level integration reduce bill-of-materials and firmware development effort.

FAQ

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

The HA, HB, and HC pins accept standard open-collector or push-pull Hall sensor outputs with logic thresholds of 0.4V (low) and 1.5V (high). They feature internal 500kΩ pull-down resistors, enabling direct connection to 3.3V or 5V Hall sensors without external biasing.

How is the over-current threshold configured using OC_ADJ?

OC_ADJ sets OCP threshold via resistor value: 0Ω yields 4.7A, floating yields 5.5A, and connecting to 3.3V yields 9A. The relationship is monotonic but non-linear; refer to Table 5 in the datasheet for exact values. No external op-amp or reference is needed.

Can MP6543HGL-B-P drive motors above 2A peak current?

Yes - absolute maximum ratings allow 8A peak (per OCP spec), but continuous operation beyond 2A requires aggressive thermal management (e.g., 2oz copper, 6+ thermal vias, forced air) and derating per θ_JA. Sustained >2A risks thermal shutdown unless PCB layout exceeds JEDEC 4-layer reference.

Is the V3P3 LDO output short-circuit protected?

No - the 3.3V LDO has no internal short-circuit protection. A 100mA load limit must be enforced externally. If downstream circuitry draws >100mA, output voltage collapses and may cause system reset; use a series fuse or current-limiting switch if risk exists.

Does nFAULT indicate which phase triggered the fault?

No - nFAULT is a global open-drain fault flag that asserts for any OCP event, thermal shutdown, or UVLO condition. Phase-specific fault isolation requires monitoring SOA/SOB/SOC outputs and correlating with PWM timing or using external current probes.

What is the minimum recommended capacitor on VCP?

A 1µF, 16V, X7R ceramic capacitor is mandatory between VCP and VIN. Lower capacitance causes gate drive instability and premature HS-FET failure; Y5V or electrolytic types are unsuitable due to aging and ESR drift at high frequency.

How does automatic synchronous rectification interact with nBRAKE?

During nBRAKE assertion (active low), all low-side FETs turn on regardless of synchronous rectification logic, forcing rapid motor deceleration via short-circuit braking. Automatic rectification is disabled in brake mode to prioritize torque reversal over efficiency.