Monolithic Power Systems Inc. MP6543HGL-Z

Overview

MP6543HGL-Z from Monolithic Power Systems is a three-phase brushless DC motor power stage integrating six N-channel MOSFETs (110mΩ HS / 105mΩ LS), internal charge pump for 100% duty-cycle operation, bidirectional current-sense amplifiers (1/4000 ratio), and adjustable over-current protection. It delivers up to 2A continuous output current at 3V–22V supply and supports EN/PWM control mode for industrial fan, drone propulsion, and HVAC blower systems.

For engineers reviewing the MP6543HGL-Z datasheet, MP6543HGL-Z pinout, MP6543HGL-Z application, or MP6543HGL-Z equivalent, key selection criteria include its QFN-24 (3mm×4mm) thermal pad package, integrated 3.3V/100mA LDO, synchronous rectification logic, UVLO (2.7V typ), and OCP threshold configurability via OC_ADJ pin.

Technical Context

The MP6543HGL-Z implements three independent half-bridge drivers with matched high-side and low-side gate drive paths, each featuring automatic synchronous rectification triggered by Sx node voltage crossing VIN or GND thresholds. Its internal charge pump generates VCP = VIN + 3.3V to sustain high-side FET conduction during 100% duty cycle, while trickle-charge circuitry maintains gate voltage under sustained PWM conditions.

Current sensing is implemented exclusively on the low-side FET path per phase, delivering ±250µA output per 1A load with 95–105% positive/negative and phase-to-phase matching. Fault management includes open-drain nFAULT assertion on UVLO (2.7V), thermal shutdown (160°C), and OCP events with 1µs deglitch and 4ms auto-retry timing.

Key Specifications

Pinout & Package

MP6543HGL-Z uses a thermally enhanced QFN-24 (3mm × 4mm) package 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 MP6542HGL-Z, MP6543HGL-Z provides 33% higher continuous current headroom and identical feature integration; versus TBD72004FNG, it reduces component count by 5+ parts but trades off automotive qualification for compactness and ease of use.

Availability

MP6543HGL-Z is available at Aetrix Electronics and suitable for industrial fan control, drone propulsion systems, and HVAC blower modules requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for MP6543HGL-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 two decades of expertise in DC/DC converters, motor drivers, and LED controllers.

The MP6543H family belongs to MPS's integrated motor driver product line, designed specifically for compact, thermally constrained BLDC applications where integration of gate drive, current sensing, and protection simplifies system-level design.

FAQ

What is the maximum allowable junction temperature for MP6543HGL-Z?

The absolute maximum junction temperature is 150°C, with thermal shutdown activating at 160°C and releasing at 135°C due to 25°C hysteresis. Continuous operation above 125°C ambient requires verified PCB copper area and thermal vias under the exposed pad to maintain θ_JA ≤ 48°C/W.

Can MP6543HGL-Z operate without an external VCP capacitor?

No. A 1µF/16V X7R ceramic capacitor must be placed between VCP and VIN pins. Omitting it prevents high-side gate drive voltage generation, causing immediate failure to drive upper FETs and resulting in unbalanced phase output or complete non-operation.

How does the current-sense output scale with load current?

SOA/SOB/SOC deliver ±250µA per ±1A of low-side FET current, based on a nominal 1/4000 current-sense ratio. With a 5kΩ termination resistor to VREF (3.3V), this yields ±12.5mV per 1A, producing a ratiometric 0A-centered voltage for ADC sampling.

Is the 3.3V LDO output short-circuit protected?

Yes. The V3P3 regulator includes internal current limiting and thermal foldback. Under sustained short-circuit, output drops to ~0.5V while drawing <150mA, preventing damage and allowing safe recovery once fault is removed.

What happens during nSLEEP assertion while PWM is active?

When nSLEEP is driven low, all gate drivers disable immediately, outputs enter high-impedance state, and internal logic resets. PWM signals are ignored until nSLEEP returns high and 1.5ms power-up delay completes-ensuring clean restart without shoot-through risk.

Does MP6543HGL-Z support 100% duty cycle in all control modes?

Yes, but only in EN/PWM mode (MP6543H variant). The internal charge pump and trickle-charge circuit maintain sufficient VCP voltage regardless of PWM duty cycle, unlike bootstrap-based drivers that fail above ~95% duty.

How is over-current protection reset after triggering?

After OCP activation, all six FETs disable for 4ms (t_OCR), then automatically re-enable. If over-current persists, the cycle repeats. No external reset signal is required, but repeated faults will hold nFAULT low continuously until condition clears.