Monolithic Power Systems Inc. MPQ6541GQKTE-AEC1-Z

Overview

MPQ6541GQKTE-AEC1-Z from Monolithic Power Systems is a three-phase brushless DC (BLDC) motor power stage IC with integrated half-bridge drivers, six N-channel MOSFETs (15 mΩ HS/LS on-resistance), three current-sense amplifiers, and AEC-Q100 Grade 1 qualification for automotive use. It delivers 8A continuous output current at 40V max input, supports 100% duty cycle via internal charge pump, and features ENBL/PWM control logic for each phase.

For engineers reviewing the MPQ6541GQKTE-AEC1-Z datasheet, MPQ6541GQKTE-AEC1-Z pinout, MPQ6541GQKTE-AEC1-Z application, or MPQ6541GQKTE-AEC1-Z equivalent, key selection criteria include its integrated current sensing (1/11600 typical ratio), thermal shutdown at 150°C, UVLO at 4.4V, OVP at 48V, and TQFN-26 wettable flank package for automotive-grade solder joint inspection.

Technical Context

The MPQ6541GQKTE-AEC1-Z integrates three independent half-bridge driver channels, each with dedicated ENA/ENB/ENC and PWMA/PWMB/PWMC inputs, enabling precise commutation control for BLDC and PMSM motors. Its gate drive architecture uses an internal charge pump (2 MHz switching) to sustain high-side FET operation at 100% duty cycle, backed by a 5.5V LDO for low-side gate drive (VG).

Current sensing is implemented per phase using bidirectional amplifiers with matched gain (1/10000–1/13000) and ±25 µA offset, referenced to VREF and terminated externally to generate ADC-compatible voltage outputs. Fault management includes independent high-side and low-side over-current detection (10–25 A thresholds), thermal shutdown with 25°C hysteresis, and open-drain nFAULT reporting.

Key Specifications

Pinout & Package

MPQ6541GQKTE-AEC1-Z is housed in a TQFN-26 (6mm × 6mm) package with wettable flanks for automated optical solder inspection. The thermally enhanced exposed pad improves heat dissipation in motor control PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ6541GQKTE-AEC1-Z, MPQ6541AGQKTE-AEC1-Z offers greater control flexibility but demands revised firmware, while STSPIN32F0A trades off automotive qualification and current capability for embedded intelligence and smaller footprint.

Availability

MPQ6541GQKTE-AEC1-Z is available at Aetrix Electronics and suitable for electric power steering (EPS), HVAC blowers, engine cooling fans, and brake boosters requiring stable component supply across automotive production lifecycles.

Supply support for MPQ6541GQKTE-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-grade solutions.

The MPQ6541-AEC1 product line delivers integrated three-phase power stages for automotive BLDC and PMSM motors, designed specifically to meet AEC-Q100 Grade 1 reliability, thermal robustness, and functional safety requirements in safety-critical subsystems.

FAQ

What is the maximum allowable continuous current per phase for MPQ6541GQKTE-AEC1-Z?

The MPQ6541GQKTE-AEC1-Z supports 8A continuous output current per phase under defined thermal conditions: 4-layer PCB, θJA = 21.4°C/W, ambient temperature ≤25°C, and proper copper pour/via layout on the exposed thermal pad. Peak current capability is 12A for ≤1 second.

How does the internal charge pump enable 100% duty cycle operation?

The charge pump generates VCP ≈ VIN + 5V to drive high-side MOSFET gates above the source potential. With 2 MHz switching and external 100 nF CP1–CP2 and 1 µF VCP–VIN capacitors, it maintains sufficient gate voltage even during sustained high-side conduction, eliminating shoot-through risk in 100% duty cycle scenarios.

Can MPQ6541GQKTE-AEC1-Z be used with sensorless BLDC control?

Yes - the integrated current-sense amplifiers (SOA/SOB/SOC) provide real-time phase current data essential for back-EMF observer-based sensorless commutation. Combined with precise PWM timing and fast fault response, it supports closed-loop FOC or trapezoidal algorithms without external current sensors.

What is the purpose of the LSS pins, and how should they be connected?

LSS (pins 10 and 12) serve as the common source node for all three low-side MOSFETs. They must be connected directly to the main power ground plane using low-inductance, wide copper traces - not routed through series resistors or ferrites - to ensure accurate current sensing and stable gate drive return paths.

Does MPQ6541GQKTE-AEC1-Z support automatic dead-time insertion?

No - dead-time must be managed externally by the MCU. The device accepts independent PWM and enable signals per phase but does not embed hardware dead-time generation. This allows full flexibility for custom commutation schemes, including adaptive dead-time adjustment based on load and temperature.

What is the recommended termination for SOA/SOB/SOC outputs when interfacing with a 3.3V ADC?

Use a 5 kΩ resistor between each SOx pin and a 3.3V reference (VREF). With typical current-sense ratio of 1/11600, this yields ~285 µA full-scale current, producing ±1.65V differential swing around 3.3V - compatible with ratiometric ADCs using dual-resistor dividers to ground and 3.3V.

How does the nSLEEP function interact with fault recovery?

When nSLEEP is asserted low, all internal circuitry shuts down and nFAULT is released (high-impedance). After nSLEEP returns high, the device requires ~1 ms to reinitialize before responding to inputs. Fault conditions occurring during sleep remain unreported until wake-up and subsequent fault detection cycles.