Monolithic Power Systems Inc. MP6543AGL-P

Overview

MP6543AGL-P from Monolithic Power Systems is a three-phase brushless DC motor power stage integrating six N-channel MOSFETs, pre-drivers, gate drive supplies, and bidirectional current-sense amplifiers. It delivers 2A continuous output (thermal- and PCB-dependent), supports 3V–12V input, features adjustable over-current protection (5.5–9A range), and operates with 100% duty cycle via internal charge pump. Used in compact BLDC motor control for drones and HVAC blowers.

For engineers reviewing the MP6543AGL-P datasheet, MP6543AGL-P pinout, MP6543AGL-P application, or MP6543AGL-P equivalent, this page provides verified functional identity, validated QFN-24 pin mapping, confirmed current-sense ratio (1/4000 A/A), thermal shutdown threshold (160°C), and real-world selection guidance against MP6543GL and MP6543BGL.

Technical Context

The MP6543AGL-P implements independent high-side and low-side logic inputs per phase (HSA/LSA, HSB/LSB, HSC/LSC), enabling precise commutation control without external logic. Its integrated 3.3V/100mA LDO powers auxiliary circuitry, while automatic synchronous rectification reduces body-diode conduction loss during inductive flyback.

Current sensing uses matched internal amplifiers with ±100mA to ±1A linear range and 95–105% phase-to-phase matching. Fault handling includes latched OCP (with deglitch time of 1µs), UVLO (2.7V typ), and open-drain nFAULT signaling - all coordinated through a centralized timing and control logic block.

Key Specifications

Pinout & Package

MP6543AGL-P is housed in a thermally enhanced 24-pin QFN package (3mm × 4mm) with exposed thermal pad for PCB-level heat dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar three-phase BLDC power stage applications.

Compared with MP6543GL and MP6543BGL, MP6543AGL-P offers unique flexibility in gate-level control - enabling custom commutation algorithms, regenerative braking, and dynamic dead-time adjustment - making it ideal for firmware-defined motor control architectures.

Availability

MP6543AGL-P is available at Aetrix Electronics and suitable for drone propulsion, HVAC blower control, cordless power tools, and medical fluid pumps requiring stable component supply and long-term production continuity.

Supply support for MP6543AGL-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, including DC/DC converters, motor drivers, and LED drivers.

The MP6543 family targets compact, efficient three-phase BLDC motor control in space-constrained applications - emphasizing integration, thermal robustness, and flexible interface options across A/B/G variants.

FAQ

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

VCP is the charge pump output that generates the gate drive voltage for the high-side MOSFETs. It delivers VIN + 3.3V and must be decoupled with a 1µF ceramic capacitor to VIN. This enables reliable high-side FET turn-on even at 100% duty cycle - essential for zero-speed torque in BLDC applications.

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

The MP6543AGL-P integrates bidirectional current-sense amplifiers measuring only low-side FET current. Each phase (SOA/SOB/SOC) outputs ±225–275µA per 1A of LS-FET current, with 95–105% matching across phases. A termination resistor converts this to voltage referenced to VREF (typically 3.3V), enabling direct ADC interfacing.

Can MP6543AGL-P operate with a 5V supply?

Yes - MP6543AGL-P supports 3V to 12V input. At 5V, it delivers reduced continuous current (derated due to R_DS(on) and thermal limits), but retains full functionality: 3.3V LDO regulation, current sensing, OCP, and nFAULT signaling. Ensure PCB layout maintains θJA ≤ 48°C/W for stable 2A operation.

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. Upon wake-up (nSLEEP 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 on MP6543AGL-P?

OCP threshold is set via the OC_ADJ pin: floating yields 7.2A typical, grounding yields 6.2A, and a resistor to GND scales threshold linearly. Protection is latched - triggering OCP disables all six FETs and pulls nFAULT low until nSLEEP is toggled or VIN is cycled - preventing uncontrolled retry attempts.

Does MP6543AGL-P include thermal protection?

Yes - MP6543AGL-P incorporates junction temperature monitoring with thermal shutdown at 160°C (±25°C hysteresis). When triggered, all output FETs disable and nFAULT asserts low. Operation resumes only after die temperature falls below 135°C, ensuring safe cooldown before re-enabling drive capability.

What package type and thermal characteristics apply to MP6543AGL-P?

MP6543AGL-P uses a 24-pin QFN package (3mm × 4mm) with exposed thermal pad. Its thermal resistance is θJA = 48°C/W (4-layer PCB) and θJC = 10°C/W. The exposed pad must be soldered to a large copper pour for effective heat transfer - insufficient thermal land area will limit achievable continuous current below 2A.