Monolithic Power Systems Inc. MP6545GV-P

Overview

MP6545GV-P from Monolithic Power Systems is a three-phase half-bridge power stage IC designed for brushless DC motor drive applications. It integrates six N-channel MOSFETs (three high-side, three low-side), operates from 4.5V to 45V input, delivers up to 2.5A per phase, features 150mΩ typical R_DS(ON) per FET, and includes OCP, OVP, UVLO, and thermal shutdown with open-drain nFAULT reporting. Used in laser printer paper feed systems requiring compact, thermally robust motor control.

For engineers reviewing the MP6545GV-P datasheet, MP6545GV-P pinout, MP6545GV-P application, or MP6545GV-P equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and protection thresholds, and real-world motor-drive use cases - all derived from MPS Rev. 1.1 datasheet and official package documentation.

Technical Context

The MP6545GV-P implements independent three-channel half-bridge gate driving with separate HSx/LSx logic inputs and automatic synchronous rectification triggered by OUTx voltage excursions beyond VIN or GND. Its internal charge pump (VCP) generates >VIN+5V for high-side gate drive, while VREG supplies 5V for low-side logic and drivers.

Protection is hardware-based and latched: over-current detection (3–4.5A trip, 1µs deglitch), input over-voltage (45–48V threshold), under-voltage lockout (4.5V rising, 300mV hysteresis), and thermal shutdown (165°C, 15°C hysteresis). Faults assert open-drain nFAULT, requiring external pull-up.

Key Specifications

Pinout & Package

MP6545GV-P uses a QFN-28 (4mm × 5mm) package with exposed thermal pad. Pin numbering follows top-view orientation with Pin 1 at top-left corner (marked by dot or beveled edge). All logic inputs include internal 100kΩ pull-down resistors.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP6545GV-P, MP6550GV offers higher current capability and sensing at the cost of increased thermal load, while TMC6300-LA trades integration for configurability and precision - making MP6545GV-P optimal for cost-sensitive, space-constrained BLDC applications where self-contained protection and simplicity are prioritized.

Availability

MP6545GV-P is available at Aetrix Electronics and suitable for laser printer paper feed systems, textile machine spindle drives, industrial pump actuation, and BLDC motor control requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle support.

Supply support for MP6545GV-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, with over two decades of expertise in DC/DC converters, motor drivers, and LED controllers.

The MP6545GV-P belongs to MPS's Simple Three-Phase Power Stage product line, engineered for compact, thermally efficient BLDC motor control in office automation, industrial motion, and consumer appliances - emphasizing integration, protection, and ease of PCB layout.

FAQ

What is the maximum continuous output current per phase for MP6545GV-P?

The MP6545GV-P delivers up to 2.5A per phase continuously under specified conditions: TA = 25°C, 4-layer PCB with thermal vias and ≥1in² copper pour on PGND layer. Actual current depends on ambient temperature, PCB copper area, and airflow; derating curves show 1.8A at 85°C ambient.

How does the automatic synchronous rectification function work?

When both HSx and LSx are off and OUTx voltage drops below GND, the LS-FET turns on to conduct recirculating current; if OUTx rises above VIN, the HS-FET turns on. This replaces body-diode conduction, reducing power loss by up to 65% during freewheeling in inductive loads like BLDC windings.

Can MP6545GV-P operate with a 3.3V logic controller?

Yes. The HSx/LSx inputs accept 2V minimum VIH and 0.8V maximum VIL, compatible with 3.3V CMOS logic. Internal 100kΩ pull-down resistors ensure safe default state; no level-shifting required for standard microcontrollers or FPGAs.

What external capacitors are mandatory for stable operation?

Four capacitors are required: (1) ≥100nF X7R ceramic on each VIN pin to PGND; (2) 1µF X7R ceramic from VREG to GND; (3) 1µF X7R ceramic from VCP to VIN; (4) 100nF X7R ceramic between CPA and CPB. All must be rated ≥16V and placed within 2mm of respective pins.

Is MP6545GV-P pin-compatible with MP6545GF?

No. Although electrically identical, MP6545GV-P (QFN-28) and MP6545GF (TSSOP-28EP) have different pinouts: e.g., GND is on Pins 11/24 in QFN but Pins 14/28 in TSSOP; OUT1 is Pin 2 in QFN but Pin 5 in TSSOP. Layout redesign is required for package substitution.

Does MP6545GV-P support 100% duty cycle operation?

No. Due to charge pump dependency for high-side drive, sustained 100% HS-FET on-time depletes VCP voltage, causing HS-FET dropout. Maximum recommended duty cycle is 95% with adequate VCP capacitance and low ESR; dead time is fixed at 80ns to prevent shoot-through.

What is the thermal resistance (θJA) of the MP6545GV-P package?

The QFN-28 (4mm × 5mm) package has θJA = 40°C/W on a standard 4-layer JEDEC PCB (JESD51-7). With 6 thermal vias under the exposed pad and 1in² copper on inner layers, θJA can improve to ≤28°C/W - enabling 2.5A operation at 85°C ambient without forced air.