Monolithic Power Systems Inc. MPQ6531GV-AEC1-P

Overview

MPQ6531GV-AEC1-P from Monolithic Power Systems is a three-phase BLDC motor pre-driver IC designed to drive six external N-channel MOSFETs in half-bridge configurations, supporting input voltages from 5V to 60V, featuring integrated charge pump gate drive (VREG = 9.5–14V), adjustable dead-time control (700ns–5.7µs), and AEC-Q100 Grade 1 qualification for automotive use in electric power steering and HVAC blower systems.

For engineers reviewing the MPQ6531GV-AEC1-P datasheet, MPQ6531GV-AEC1-P pinout, MPQ6531GV-AEC1-P application, or MPQ6531GV-AEC1-P equivalent, key selection criteria include bootstrap-supported 100% duty-cycle operation, VDS-based short-circuit protection with 3µs deglitch, LSS-referenced over-current detection (0.4–0.6V threshold), thermal shutdown at 190°C, and QFN-28 (4mm×5mm) thermally enhanced packaging with exposed pad.

Technical Context

The MPQ6531GV-AEC1-P implements a dual-path gate drive architecture: a regulated charge pump generates ~11.5V for low-side drivers and bootstrap capacitor charging, while an internal trickle-charge circuit sustains high-side gate voltage during continuous conduction. It uses VDS sensing across each MOSFET for short-circuit detection and LSS pin voltage monitoring for shunt-based over-current protection.

Control logic accepts independent high-side (HA/HB/HC) and low-side (LA/LB/LC) inputs with internal pull-downs, supports programmable dead time via external resistor on DT pin, and reports faults via open-drain nFAULT. Sleep mode (nSLEEP) reduces quiescent current to 1.4µA and initiates full power-up sequence on wake-up, including sequential low-side turn-on for bootstrap capacitor precharge.

Key Specifications

Pinout & Package

The MPQ6531GV-AEC1-P is housed in a thermally enhanced QFN-28 package (4mm × 5mm) with exposed thermal pad, optimized for automotive motor control PCB layouts requiring high power density and efficient heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DRV8305-Q1 and STSPIN32F0B, MPQ6531GV-AEC1-P delivers superior thermal robustness (190°C shutdown), simpler analog control interface, and guaranteed 100% duty-cycle operation - making it optimal for high-reliability, high-temperature automotive actuators where deterministic analog timing and minimal firmware dependency are critical.

Availability

MPQ6531GV-AEC1-P is available at Aetrix Electronics and suitable for electric power steering, HVAC blower control, and brake booster vacuum pump applications requiring stable component supply, AEC-Q100 compliance, and long-term automotive lifecycle support.

Supply support for MPQ6531GV-AEC1-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 design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MPQ6531 belongs to MPS's automotive-grade motor driver product line, engineered specifically for robust, high-efficiency three-phase BLDC pre-driver applications in demanding automotive environments including EPS, HVAC, and chassis systems.

FAQ

What is the minimum recommended bootstrap capacitor value for MPQ6531GV-AEC1-P?

The minimum bootstrap capacitor is 0.1µF (X7R/X5R ceramic, 25V rating). This value ensures adequate charge storage for high-side gate drive during PWM transitions. Larger values up to 1µF improve stability under high-duty-cycle or high-frequency operation but may delay startup if oversized beyond 1µF.

How does the MPQ6531GV-AEC1-P handle 100% duty cycle operation without external boost?

It uses an internal trickle-charge circuit that supplies ~5µA to the bootstrap capacitors during high-side conduction, compensating for leakage and maintaining gate voltage above threshold. This eliminates need for external charge pumps or auxiliary supplies while supporting continuous conduction in applications like EPS hold-torque mode.

Can short-circuit protection and over-current protection be disabled independently?

Yes. Both protections are disabled simultaneously by connecting a 100kΩ resistor from VREG to OC_REF, which overrides the OC_REF input threshold. There is no provision for independent disable - both rely on the same OC_REF reference path and fault latching mechanism.

What is the purpose of the LSS pin, and how is its voltage threshold determined?

LSS monitors voltage across an external shunt resistor placed between low-side MOSFET sources and ground. Its OCP threshold is fixed at 0.4–0.6V (typ. 0.5V); current limit is set by shunt resistance (e.g., 5mΩ → 100A trip). If OCP is unused, LSS must be tied directly to ground - floating is not allowed.

Does the MPQ6531GV-AEC1-P require external gate resistors, and why?

Yes. External gate resistors are required to control MOSFET switching speed, reduce EMI, and prevent ringing. The IC's 0.8A source / 1A sink capability supports fast turn-on/off, but uncontrolled edge rates risk shoot-through, voltage overshoot, and EMC failures - especially in high-current automotive motor drives.

How does the dead-time resistor (R_DT) affect timing accuracy across temperature and voltage?

R_DT sets dead time per t_DEAD(ns) = 60 × R(kΩ), with ±15% tolerance over -40°C to +125°C. For precision timing, use 1% metal-film resistors; variation in R_DT directly scales dead time - e.g., 20kΩ yields ~1.2µs, 23kΩ yields ~1.38µs - allowing layout-specific tuning.

Is the nFAULT output compatible with 3.3V microcontrollers?

Yes. nFAULT is an open-drain output with 0.5V max low-voltage at 5mA sink, fully compatible with 3.3V logic. An external pull-up resistor (typically 4.7kΩ to 3.3V) is required; internal pull-up is not provided. Leakage current is ≤1µA when high, ensuring clean logic-level signaling.