Monolithic Power Systems Inc. MP6543BGL-Z

Overview

MP6543BGL-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 supports Hall-sensor commutation (HA/HB/HC inputs), delivers 2A continuous output per phase at 12V supply, features adjustable over-current protection (5.5–9A range), and includes a 3.3V/100mA LDO for MCU biasing - used in compact BLDC fan and pump drivers.

For engineers reviewing the MP6543BGL-Z datasheet, MP6543BGL-Z pinout, MP6543BGL-Z application, or MP6543BGL-Z equivalent, key selection criteria include Hall-input timing compatibility, 100% duty-cycle support via internal charge pump, thermal shutdown behavior at 160°C, and SOA-limited 2A continuous operation under PCB-dependent thermal conditions.

Technical Context

The MP6543B implements Hall-based six-step commutation logic with DIR and nBRAKE control inputs, where HA/HB/HC determine phase sequencing and PWM sets speed/torque. Its synchronous rectification circuit actively turns on low-side FETs during inductive flyback to reduce body-diode conduction loss.

Internal protection includes UVLO (2.7V threshold with 150mV hysteresis), thermal shutdown (160°C trip with 25°C hysteresis), and latched OCP triggered by LS-FET current exceeding programmable threshold - all signaled via open-drain nFAULT.

Key Specifications

Pinout & Package

MP6543BGL-Z uses a thermally enhanced QFN-24 (3mm × 4mm) package with exposed 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 MP6543AGL-Z, MP6543BGL-Z trades flexible gate control for plug-and-play Hall integration; versus TB6605FTG, it sacrifices voltage headroom and R_DS(on) for simplified 12V system design with fewer external components.

Availability

MP6543BGL-Z is available at Aetrix Electronics and suitable for computer cooling fans, automotive HVAC blowers, industrial vacuum pumps, and medical infusion pumps requiring stable component supply across production lifecycles.

Supply support for MP6543BGL-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 design centers in the US, China, and Taiwan.

The MP6543 product line targets cost-sensitive, space-constrained BLDC motor applications - delivering integrated gate drive, sensing, and protection in a single QFN package to replace discrete half-bridge solutions.

FAQ

What Hall sensor voltage levels are compatible with MP6543BGL-Z inputs?

HA, HB, and HC accept standard 3.3V or 5V CMOS logic levels. Input logic high threshold is 1.5V minimum; logic low is 0.4V maximum. Internal 500kΩ pull-down resistors ensure defined state when unconnected, supporting open-collector Hall sensors with external pull-ups.

How does the MP6543BGL-Z handle motor stall conditions?

During stall, LS-FET current rises until the OCP threshold is exceeded. If sustained beyond 1µs deglitch time, all six FETs disable, nFAULT pulls low, and outputs go high-impedance. Recovery requires either cycling nSLEEP or power-cycling VIN - preventing automatic restart until fault cause is removed.

Can the integrated 3.3V LDO power an external microcontroller?

Yes - the V3P3 pin delivers up to 100mA at 3.3V ±3.5%. It must be bypassed with a 0.47µF ceramic capacitor to GND. For loads >50mA, verify voltage drop under worst-case ambient temperature, as LDO thermal performance depends on PCB copper area and θJA.

What is the purpose of the dual LSS pins (pins 8 and 12)?

Pins 8 and 12 are electrically connected internally and serve as the common low-side source node for all three phases. They must be tied directly to the main system ground plane with low-inductance routing to minimize noise coupling and ensure accurate current sensing and thermal performance.

Does MP6543BGL-Z support sinusoidal (FOC) commutation?

No - it implements fixed six-step trapezoidal commutation based solely on HA/HB/HC inputs. For field-oriented control, use MP6543AGL-Z with independent HS/LS inputs or select a dedicated motor control IC with PWM modulation and ADC interfaces.

How is thermal performance affected by PCB layout?

Thermal resistance θJA is rated at 48°C/W on a 4-layer JEDEC board. With minimal copper, junction temperature can exceed 125°C at 2A continuous. Use the exposed thermal pad with ≥6 thermal vias to inner ground planes and maximize 2oz copper area under the package to maintain safe operation.

What happens during nSLEEP assertion and release?

Asserting nSLEEP low disables all internal circuits, dropping quiescent current to 45–60µA. Upon release, a 1.5ms internal power-up delay occurs before ENA/HA/PWM inputs are recognized - this ensures stable gate drive voltage and LDO regulation before enabling motor drive.