Monolithic Power Systems Inc. MP6545AGF-P

Overview

MP6545AGF-P from Monolithic Power Systems is a three-phase half-bridge power stage IC designed for brushless DC motor drive systems. It integrates six N-channel MOSFETs (150mΩ LS / 135mΩ HS R_DS(ON)), operates from 4.5V to 45V input, delivers up to 2.5A per phase, and supports independent current sensing via three dedicated LSSx terminals. Used in laser printer paper feed drives requiring precise phase-current monitoring and thermal robustness.

For engineers reviewing the MP6545AGF-P datasheet, MP6545AGF-P pinout, MP6545AGF-P application, or MP6545AGF-P equivalent, this page provides verified functional context, validated package mapping (TSSOP-28EP), confirmed protection thresholds (OCP = 4.5A, UVLO = 4.5V, OVP = 45V), and real-world timing behavior (t_OCP = 1µs, dead time = 80ns).

Technical Context

The MP6545AGF-P implements independent high-side and low-side gate drivers per phase with internal charge-pump (VCP) and 5V regulator (VREG) supplies, enabling full N-MOSFET bridge operation without external bootstrap components. Its synchronous rectification logic actively turns on LS-FETs when V_OUTx < GND or HS-FETs when V_OUTx > VIN to minimize body-diode conduction loss.

Protection is implemented as latched shutdowns: over-current triggers within 1µs deglitch window and disables all FETs; over-voltage (45V threshold) and under-voltage (4.5V rising) lockouts disable outputs; thermal shutdown activates at 165°C with 15°C hysteresis. Fault status is reported via open-drain nFAULT with external pull-up.

Key Specifications

Pinout & Package

MP6545AGF-P uses the TSSOP-28EP package (9.8mm × 4.5mm × 1.05mm height) with exposed thermal pad. Pin numbering follows JEDEC MO-153 variation AET; pin 1 is marked by notch/dot. The package supports 3.9W continuous power dissipation at T_A = 25°C (θ_JA = 32°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP6545AGF-P, MP6545AGV trades thermal performance for footprint reduction, while DRV8305PWP adds intelligence at the expense of analog simplicity and direct shunt compatibility-making MP6545AGF-P optimal for cost-sensitive, analog-feedback BLDC systems needing proven 2.5A reliability in TSSOP format.

Availability

MP6545AGF-P is available at Aetrix Electronics and suitable for laser printer motion control, textile machine spindle drives, and automated document feeder systems requiring stable component supply across extended production lifecycles.

Supply support for MP6545AGF-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 cost-optimized, high-reliability three-phase motor drive applications in office automation and light industrial equipment, emphasizing integrated protection, current sensing flexibility, and simplified layout.

FAQ

What is the maximum continuous output current per phase for MP6545AGF-P?

The MP6545AGF-P delivers up to 2.5A per phase continuously under standard conditions (T_A = 25°C, 4-layer PCB with 2oz copper and thermal vias). Actual current capability depends on ambient temperature, PCB copper area, and airflow; derating curves show ~1.8A at 85°C ambient with typical layout.

How does the MP6545AGF-P implement current sensing without dedicated sense pins?

It uses three independent LSSx (low-side source) terminals-one per phase-that expose the source node of each low-side MOSFET. By placing a shunt resistor between LSSx and system GND, users measure phase current directly with minimal interference from high-side switching noise or shared ground paths.

Can MP6545AGF-P drive a delta-connected BLDC motor?

Yes. The device's three independent half-bridges support both star and delta motor configurations. For delta connection, connect OUT1–OUT2–OUT3 to the motor vertices and route control signals accordingly; ensure phase current limits remain within 2.5A per leg and thermal design accounts for higher circulating currents.

What external capacitors are mandatory for stable operation?

Four capacitors are required: (1) ≥100nF X7R ceramic on each VIN pin to GND; (2) 1µF X7R on VREG to GND; (3) 1µF X7R on VCP to VIN; (4) 100nF X7R rated for full VIN between CPA and CPB. All must be placed adjacent to respective pins per MPS layout guidelines.

Does nFAULT indicate which specific fault occurred?

No. nFAULT is a single open-drain output that pulls low for any active fault condition-OCP, OVP, or OTP-but does not encode fault type. System-level diagnosis requires correlating nFAULT assertion with real-time VIN, temperature, and current measurements to isolate root cause.

Is MP6545AGF-P RoHS-compliant and halogen-free?

Yes. MP6545AGF-P is lead-free, halogen-free, and fully compliant with the EU RoHS directive (2011/65/EU). Full compliance documentation, including substance declarations and test reports, is available on the MPS Quality Assurance website.

What is the minimum recommended dead time between HS and LS switching?

The internal dead time is fixed at 80ns. This value is optimized to prevent shoot-through while maintaining efficient commutation; no external dead-time insertion is needed or supported. Layout must minimize gate loop inductance to preserve timing integrity.