Monolithic Power Systems Inc. MP6543AGL-Z

Overview

MP6543AGL-Z 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 per phase at 3V–12V supply, features adjustable over-current protection (6.2A typ), internal 3.3V/100mA LDO, and supports 100% duty cycle via integrated charge pump. Used in compact BLDC motor control for drones and HVAC blowers.

For engineers reviewing the MP6543AGL-Z datasheet, MP6543AGL-Z pinout, MP6543AGL-Z application, or MP6543AGL-Z equivalent, key selection considerations include its LS/HS input architecture (vs. EN/PWM or Hall inputs), QFN-24 thermal pad layout, 110mΩ HS/105mΩ LS on-resistance, synchronous rectification behavior, and fault reporting via open-drain nFAULT.

Technical Context

The MP6543AGL-Z implements independent high-side and low-side gate control logic per phase, enabling precise commutation timing and dead-time management (40ns typ). Its current-sense architecture measures only low-side FET current with ±1A full-scale range and 1/4000 A/A ratio, delivering analog outputs (SOA/SOB/SOC) referenced to VREF.

It uses an internal charge pump (VCP = VIN + 3.3V) to sustain high-side gate drive at 100% duty cycle, coupled with automatic synchronous rectification that activates when Sx voltage falls below GND or rises above VIN. Thermal shutdown (160°C) and UVLO (2.7V typ) are latched until nSLEEP reset or VIN power-cycle.

Key Specifications

Pinout & Package

MP6543AGL-Z is housed in a thermally enhanced 24-pin QFN package (3mm × 4mm) with exposed thermal pad for PCB-level heat dissipation. Pin numbering follows standard 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 MP6543GL-Z, the MP6543AGL-Z offers finer gate timing control for advanced motor algorithms; versus MP6543BGL-Z, it shifts commutation responsibility to the MCU but provides greater flexibility in braking and dead-time management.

Availability

MP6543AGL-Z is available at Aetrix Electronics and suitable for drone propulsion, HVAC blower motor control, and industrial pump driver designs requiring stable component supply, thermal reliability, and programmable protection.

Supply support for MP6543AGL-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 expertise in DC/DC converters, motor drivers, and LED controllers.

The MP6543 family belongs to MPS's integrated motor driver product line, designed specifically for compact, efficient three-phase BLDC motor control in battery-powered and 12V industrial equipment.

FAQ

What is the function of the VCP pin on MP6543AGL-Z?

The VCP pin is the charge pump output used to generate the gate drive voltage for the high-side MOSFETs. It must be connected to VIN through a 1µF/10V ceramic capacitor to sustain gate voltage during 100% duty cycle operation. Without this capacitor, high-side drive collapses, causing output failure or shoot-through risk.

How does the current-sense amplifier work on MP6543AGL-Z?

The MP6543AGL-Z integrates bidirectional current-sense amplifiers measuring only low-side FET current. Each SOx pin sources or sinks current proportional to LS-FET conduction (e.g., 250µA per 1A), referenced to VREF. A termination resistor converts this to voltage for ADC sampling, supporting both forward and reverse current detection.

Can MP6543AGL-Z operate without an external microcontroller?

No - MP6543AGL-Z is a gate driver IC requiring external logic to generate HS/LS timing signals. It lacks built-in commutation logic or PWM generation. A microcontroller or dedicated motor controller IC must provide synchronized HSA/HSB/HSC and LSA/LSB/LSC signals based on rotor position or sensorless estimation.

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

The nSLEEP pin disables all internal circuitry when driven low, reducing quiescent current to 45µA. Upon release (pulled high), the device requires 1.5ms before responding to control inputs - this is a fixed power-up delay for internal bias and reference stabilization, not configurable.

How is over-current protection configured and reset on MP6543AGL-Z?

OCP threshold is set by resistor value on OC_ADJ (7.2A typ when floating). When triggered, all six FETs disable and nFAULT goes low. The fault is latched until either VIN is power-cycled or nSLEEP is toggled low-then-high - no software reset is possible.

Does MP6543AGL-Z support 100% duty cycle operation, and how is it achieved?

Yes - MP6543AGL-Z supports true 100% duty cycle via its internal charge pump and trickle-charge circuit. The charge pump generates VCP = VIN + 3.3V to drive high-side gates, while the trickle-charge maintains gate voltage during extended high-side-on periods, eliminating reliance on external bootstrap capacitors.

What thermal design guidance applies to the QFN-24 package of MP6543AGL-Z?

The QFN-24 (3mm×4mm) package requires direct connection of the exposed thermal pad to a large copper pour tied to internal ground planes. With proper 4-layer PCB layout, θJA is 48°C/W - enabling 2A continuous operation up to +85°C ambient. Thermal vias under the pad (≥6×0.3mm) are mandatory for production-grade reliability.