Monolithic Power Systems Inc. MP6543HGL-B-Z

Overview

MP6543HGL-B-Z 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 delivers 2A continuous output current with 110mΩ HS and 105mΩ LS on-resistance per FET, supports 100% duty cycle via internal charge pump, and accepts Hall-effect sensor inputs (HA/HB/HC) for commutation control in BLDC motor drives.

For engineers reviewing the MP6543HGL-B-Z datasheet, MP6543HGL-B-Z pinout, MP6543HGL-B-Z application, or MP6543HGL-B-Z equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and protection thresholds, real-world current-sense scaling (1/4000 A/A), and direct substitution guidance against functionally matched alternatives.

Technical Context

The MP6543HGL-B-Z implements Hall-based six-step commutation logic using three 120°-spaced Hall inputs (HA/HB/HC), with DIR and PWM pins controlling motor direction and speed, and nBRAKE enabling active braking. Its gate drivers use automatic synchronous rectification to minimize body-diode conduction loss during inductive flyback.

Protection architecture includes adjustable over-current detection (4.7–9A range via OC_ADJ resistor), thermal shutdown at 160°C with 25°C hysteresis, UVLO at 2.7V (±0.2V), and open-drain nFAULT reporting. The integrated charge pump generates VCP = VIN + 3.3V to sustain high-side drive at 100% duty cycle without external bootstrap components.

Key Specifications

Pinout & Package

MP6543HGL-B-Z is housed in 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 MP6543HGL-B-Z, the MP6543HGL-Z offers simpler logic interface but no Hall decoding, while the TB6605FTG trades integration for higher current capability and external biasing complexity-making MP6543HGL-B-Z optimal for compact, Hall-sensor-based BLDC systems needing self-contained power and sensing.

Availability

MP6543HGL-B-Z is available at Aetrix Electronics and suitable for drone propulsion systems, industrial fan controllers, medical infusion pumps, and automotive HVAC blowers requiring stable component supply, consistent parametric performance, and long-term lifecycle support.

Supply support for MP6543HGL-B-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-efficiency power management ICs, with expertise in DC/DC converters, motor drivers, and integrated power stages since 1997.

The MP6543H family targets compact, high-reliability BLDC motor control in space-constrained applications-designed to replace discrete MOSFET+driver solutions with single-chip integration of gate drive, sensing, protection, and regulation.

FAQ

What Hall-effect sensor voltage levels are compatible with MP6543HGL-B-Z inputs?

The HA, HB, and HC pins accept standard 3.3V CMOS logic levels with VIH ≥ 1.5V and VIL ≤ 0.4V. They feature internal 500kΩ pull-down resistors, ensuring defined low state when sensors are disconnected or inactive. No level-shifting is needed for common 3.3V Hall sensors.

How is over-current protection configured and what is its response behavior?

OCP threshold is set by connecting a resistor from OC_ADJ to GND: 0Ω yields 4.7A, floating yields 5.5A. Upon detection, all six FETs disable for 4ms (retry time), then automatically re-enable. During fault, nFAULT pulls low and current recirculates through body diodes until recovery.

Does MP6543HGL-B-Z support 100% duty cycle operation, and how is it implemented?

Yes-it uses an internal charge pump generating VCP = VIN + 3.3V to sustain high-side gate drive indefinitely. A 1µF/16V X7R ceramic capacitor must be placed between VCP and VIN. This eliminates reliance on bootstrap diodes/capacitors and enables true 100% on-time without voltage decay.

What is the purpose of the V3P3 pin and what load can it drive?

V3P3 is the output of an integrated 3.3V LDO rated for 100mA continuous current. It powers external low-power circuitry such as microcontrollers, Hall sensors, or communication interfaces. A 4.7µF ceramic capacitor to GND is mandatory for stability and transient response.

Can MP6543HGL-B-Z operate with a 5V-only supply, or does it require higher voltage?

It operates from 3V to 22V, so 5V is valid-but performance is constrained. At 5V, the charge pump cannot generate sufficient gate voltage for robust high-side drive, limiting output current and efficiency. For full 2A capability, ≥12V is recommended per datasheet thermal characterization.

How does automatic synchronous rectification improve efficiency in inductive loads?

When both HS and LS FETs are off and phase voltage goes below GND or above VIN, the IC turns on the appropriate FET to conduct recirculating current-replacing lossy body-diode conduction. This reduces power dissipation by up to 60% compared to diode-based freewheeling at 2A.

Is the current-sense amplifier unidirectional or bidirectional, and what is its accuracy?

It is bidirectional, measuring ±1A low-side current with 95–105% matching across phases and ±5% full-scale error. Output current scales at 1/4000 A/A (e.g., ±1A → ±250µA), enabling precise torque or stall detection when converted to voltage via external R_REF.