Monolithic Power Systems Inc. MPQ6541AGQKTE-AEC1-Z

Overview

MPQ6541AGQKTE-AEC1-Z from Monolithic Power Systems is a three-phase, AEC-Q100 Grade 1 qualified BLDC motor power stage integrating six N-channel MOSFETs (15 mΩ HS/LS R_DS(on)), three half-bridge drivers, six pre-drivers, two gate driver supplies, and three bidirectional current-sense amplifiers. It delivers 8A continuous or 12A peak output current, supports 4.75–40V input, and enables 100% duty-cycle operation via internal charge pump - used in automotive HVAC blower and EPS motor control systems.

For engineers reviewing the MPQ6541AGQKTE-AEC1-Z datasheet, MPQ6541AGQKTE-AEC1-Z pinout, MPQ6541AGQKTE-AEC1-Z application, or MPQ6541AGQKTE-AEC1-Z equivalent, key selection criteria include its integrated current sensing with ±25 µA offset, thermal shutdown at 150°C, UVLO/OVP thresholds (4.4 V / 48 V), and TQFN-26 wettable flank package for automated optical inspection.

Technical Context

The device implements independent half-bridge control per phase using either PWM/ENBL (MPQ6541-AEC1) or separate HS/LS logic inputs (MPQ6541A-AEC1); this part is the latter variant. Its synchronous rectification logic actively commutates recirculating inductive current by turning on LS-FET when Sx falls below GND or HS-FET when Sx rises above VIN.

Protection architecture includes cycle-by-cycle over-current detection on both high-side (10–19 A trip) and low-side (17.5–25 A trip) paths with 0.4 µs deglitch time, plus thermal shutdown with 25°C hysteresis, UVLO (4.4 V ±470 mV), and OVP (48 V ±1.3 V) - all asserting open-drain nFAULT.

Key Specifications

Pinout & Package

TQFN-26 (6 mm × 6 mm) with wettable flank - optimized for automated optical inspection (AOI) and high thermal dissipation via exposed pad soldered to PCB ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ6541AGQKTE-AEC1-Z, MPQ6535AGQKTE-AEC1-Z trades current sensing and headroom for lower cost, while STSPIN32F0601TR replaces flexibility with embedded control - making the MPQ6541AGQKTE-AEC1-Z optimal for modular, MCU-agnostic motor driver designs requiring diagnostic-grade current feedback.

Availability

MPQ6541AGQKTE-AEC1-Z is available at Aetrix Electronics and suitable for automotive HVAC blower, electric power steering (EPS), and radiator cooling fan applications requiring stable component supply across extended temperature and high-reliability automotive programs.

Supply support for MPQ6541AGQKTE-AEC1-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 over 20 years of expertise in DC/DC converters, motor drivers, and automotive-qualified solutions.

The MPQ6541-AEC1 product line delivers integrated three-phase power stages for automotive BLDC/PMSM motors - designed specifically to replace discrete MOSFET + gate driver + sense amplifier combinations in space- and reliability-constrained chassis and comfort systems.

FAQ

What is the difference between MPQ6541-AEC1 and MPQ6541A-AEC1?

The MPQ6541A-AEC1 uses separate high-side (HSA/HSB/HSC) and low-side (LSA/LSB/LSC) logic inputs for independent phase control, while the MPQ6541-AEC1 uses PWM/ENBL pairs. This part, MPQ6541AGQKTE-AEC1-Z, is the MPQ6541A-AEC1 variant. Both share identical MOSFETs, protection features, and package.

How does the internal charge pump support 100% duty cycle?

The charge pump generates ≥VIN+5 V at VCP using CP1/CP2 and VCP/VIN capacitors, sustaining high-side gate voltage even when PWM duty cycle reaches 100%. This avoids shoot-through risk and enables zero-speed torque hold without external bootstrap circuitry.

Can the current-sense outputs drive an MCU ADC directly?

Yes - SOA/SOB/SOC are current-output pins with ±25 µA offset and 0–5 V swing. Connect a 5 kΩ resistor from each SOx to 5 V VREF to generate 0–5 V voltage proportional to phase current (VSOUT = VREF + (ILOAD × RREF)/11,000).

What thermal performance can be expected on a standard 4-layer PCB?

With recommended layout (exposed pad soldered, thermal vias, 2 oz copper), θ_JA is 21.4°C/W. At 8 A continuous and 24 V input, power dissipation is ~1.92 W, resulting in ~41°C junction rise above ambient - well within the 125°C max operating junction temperature.

Is nFAULT asserted during over-voltage events?

No - OVP disables all MOSFETs but does not assert nFAULT. Only UVLO, OCP, OTP, and internal faults trigger nFAULT. This allows system-level OVP handling (e.g., pre-charge control) without forcing MCU fault interrupts.

What is the purpose of the LSS pins?

LSS (pins 10 and 12) are dedicated low-side source returns - they must be shorted externally to GND. This creates a Kelvin connection for current sensing, isolating sense-path IR drop from power-ground noise and improving measurement accuracy to ±1%.

Does automatic synchronous rectification require MCU intervention?

No - it is fully hardware-based. When both HS and LS FETs are off and Sx voltage crosses GND or VIN thresholds, internal comparators autonomously turn on the appropriate FET to clamp voltage and decay current - no timing or firmware overhead required.