Monolithic Power Systems Inc. MP6545AGV-P

Overview

MP6545AGV-P from Monolithic Power Systems is a three-phase half-bridge power stage IC designed for brushless DC (BLDC) motor control in compact industrial drives. It integrates six N-channel MOSFETs with 150mΩ typical R_DS(ON) per FET, operates from 4.5V to 45V input, delivers up to 2.5A per phase, and supports independent current sensing via three dedicated LSS pins - used in laser printer paper feed systems requiring precise torque regulation.

For engineers reviewing the MP6545AGV-P datasheet, MP6545AGV-P pinout, MP6545AGV-P application, or MP6545AGV-P equivalent, key selection criteria include its QFN-28 (4mm×5mm) thermal performance (θ_JA = 40°C/W), independent GND-per-half-bridge architecture for shunt-based phase current measurement, and integrated OCP/OVP/UVLO/thermal shutdown with open-drain nFAULT reporting.

Technical Context

The MP6545AGV-P implements three independent half-bridge drivers with separate HSx/LSx logic inputs and dedicated LSSx source terminals for each phase, enabling true three-wire current sensing without shared ground path interference. Its internal charge pump (VCP) generates >VIN+5V for high-side gate drive, while VREG supplies regulated 5V for low-side logic and gate drivers.

Protection is implemented at silicon level: over-current detection triggers within 1µs deglitch window on both sourcing and sinking paths (IOCP1/IOCP2 = 3–4.5A), UVLO activates at 4.5V (300mV hysteresis), and thermal shutdown engages at 165°C with 15°C hysteresis. Fault status is reported via open-drain nFAULT with internal pull-down on all control inputs.

Key Specifications

Pinout & Package

MP6545AGV-P uses a thermally enhanced QFN-28 (4mm×5mm) package with 0.5mm pitch and exposed thermal pad. Pin numbering follows standard JEDEC top-view orientation (Pin 1 marked).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP6545AGV-P, MP6550AGQ-Z trades sensing simplicity for higher voltage/current headroom, while STSPIN32F0A replaces external microcontroller dependency with integrated processing - making MP6545AGV-P optimal for cost-sensitive, externally controlled BLDC systems requiring clean analog current feedback.

Availability

MP6545AGV-P is available at Aetrix Electronics and suitable for laser printer paper feed systems, industrial fan controllers, and textile machine spindle drives requiring stable component supply across multi-year production cycles.

Supply support for MP6545AGV-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, founded in 1997 and headquartered in Kirkland, Washington.

The MP6545A product line targets compact, thermally constrained BLDC motor drives requiring integrated current sensing and robust protection - emphasizing layout simplicity and reliability in industrial automation and office equipment.

FAQ

What is the maximum allowable PCB temperature rise for continuous 2.5A operation per phase?

At 2.5A per phase with 150mΩ R_DS(ON), conduction loss is ~0.94W per FET (1.88W per half-bridge). With θ_JA = 40°C/W on a 4-layer board, junction-to-ambient rise is ~75°C. For TJ ≤ 125°C, maximum ambient must be ≤50°C - requiring ≥200mm² of 2oz copper under the thermal pad and ≥4 thermal vias.

Can the MP6545AGV-P drive a sensorless BLDC motor using back-EMF detection?

Yes - the device supports sensorless commutation when paired with an external microcontroller that monitors OUTx voltage during LS-FET conduction to detect zero-crossing events. Its Hi-Z state (HSx=LSx=0) and fast propagation delays (<360ns) enable precise timing for back-EMF sampling windows.

Is external current sensing required, or does the IC include integrated shunt amplifiers?

External current sensing is required. The MP6545AGV-P provides dedicated LSSx pins and isolated GND paths for connecting external shunt resistors, but contains no integrated current-sense amplifiers - signal conditioning must be performed externally or by the host µC's ADC.

How does the nSLEEP function interact with the charge pump and gate drive circuitry?

Pulling nSLEEP low disables the internal charge pump (VCP), halts all gate drive signals, and places outputs in Hi-Z state. Upon wake-up, a mandatory 600µs stabilization period occurs before HS/LS inputs are accepted - ensuring VCP reaches target voltage and internal logic resets cleanly.

What is the minimum recommended dead time between HSx and LSx switching transitions?

The internal dead time is fixed at 80ns. To prevent shoot-through, external PWM generation must enforce ≥100ns minimum off-time between complementary HSx/LSx edges - verified by oscilloscope measurement at the OUTx node under worst-case load conditions.

Does the MP6545AGV-P support 100% duty cycle operation on any phase?

No - the internal charge pump requires periodic LS-FET conduction to refresh VCP. Continuous 100% HS-FET duty cycle causes VCP collapse, leading to high-side driver failure. Maximum practical HS duty cycle is 95% with ≥5% LS conduction per PWM period.

Are the HSx/LSx inputs 3.3V- or 5V-tolerant, and what logic thresholds apply?

HSx/LSx inputs are CMOS-compatible with VIH = 2.0V min and VIL = 0.8V max, supporting direct interface with both 3.3V and 5V microcontrollers. Internal 100kΩ pull-down resistors ensure defined low state when inputs float, eliminating need for external biasing.