Monolithic Power Systems Inc. MPQ6524GRE-AEC1-Z

Overview

MPQ6524GRE-AEC1-Z from Monolithic Power Systems is a quad half-bridge motor driver IC with integrated DMOS power MOSFETs, serial SPI-compatible interface (up to 3 MHz), AEC-Q100 Grade 1 qualification, 0.9A per channel output current, and full fault diagnostics including open-load, short-circuit, over-temperature pre-warning/shutdown, and under-voltage protection - used in automotive seat/mirror actuation and HVAC damper control.

For engineers reviewing the MPQ6524GRE-AEC1-Z datasheet, MPQ6524GRE-AEC1-Z pinout, MPQ6524GRE-AEC1-Z application, or MPQ6524GRE-AEC1-Z equivalent, key selection criteria include serial daisy-chain capability, wettable flank QFN-24 package for automated optical inspection, standby quiescent current <6μA, R_DS(ON) ≤2Ω at 150°C, and hardware/software dual enable (EN pin + SE bit) for fail-safe system control.

Technical Context

The MPQ6524 implements four independent half-bridge outputs (OUT1–OUT4), each configurable as high-side, low-side, or H-bridge via separate HSx/LSx control bits in a 16-bit serial register. It integrates charge-pump gate drivers, UVLO (6.5V rising threshold), thermal pre-warning (120–170°C), and shutdown (150–200°C) with hysteresis.

Serial communication uses CS-active-low frame synchronization, DI sampled on CLK falling edge, DO driven on CLK rising edge, and supports status readback of TP (temp pre-warning), SCD (short-circuit), PSF (power supply fail), and open-load flags without full register transfer - enabling real-time fault interrogation in safety-critical automotive subsystems.

Key Specifications

Pinout & Package

MPQ6524GRE-AEC1-Z is housed in a wettable flank QFN-24 (4mm × 4mm) package optimized for automated optical inspection (AOI) and solder joint reliability in automotive PCB assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad half-bridge motor driver applications.

Compared with TLE9201SG and BD1694FS, MPQ6524GRE-AEC1-Z uniquely combines daisy-chain SPI, wettable flank QFN, thermal pre-warning, and integrated discharge - making it the only option qualified for ASIL-B–aligned automotive body electronics requiring zero-defect solder joint verification and multi-device coordinated actuation.

Availability

MPQ6524GRE-AEC1-Z is available at Aetrix Electronics and suitable for automotive seat control, HVAC damper actuation, electronic parking brake auxiliary functions, and ADAS camera focus systems requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.

Supply support for MPQ6524GRE-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 design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MPQ6524 belongs to MPS's automotive-grade motor driver product line, engineered specifically for ASIL-B–capable body electronics requiring integrated diagnostics, low-power standby, and robust thermal performance in space-constrained modules.

FAQ

What is the purpose of the FAULT pin, and how is it electrically configured?

The FAULT pin is an open-drain, active-low output that asserts low whenever any channel experiences over-current, over-temperature shutdown, or under-voltage lockout. It is rated for ≤6V absolute maximum and requires an external pull-up resistor (typically 10kΩ to VCC). The pin aggregates faults across all four half-bridges, enabling system-level monitoring without polling the serial interface.

How does open-load detection operate, and what load conditions trigger it?

Open-load detection activates when the OLD bit (bit 13) in the input register is set low. It applies a controlled pull-down current (~2mA) to each low-side output. If no return path exists (i.e., open circuit), the corresponding LSx or HSx status bit in the output register reads high. Detection requires the output to be switched off first - it does not function during active drive.

Can MPQ6524GRE-AEC1-Z drive a full H-bridge per motor, and how is direction controlled?

Yes - each of the four half-bridges (OUT1–OUT4) can be paired (e.g., OUT1+OUT2) to form two independent full H-bridges, or used individually as high-side/low-side switches. Direction is controlled by setting complementary HSx/LSx bits: e.g., HS1=1/LS1=0 for forward, HS1=0/LS1=1 for reverse, both=0 for brake, both=1 for coast - all via serial register writes.

What is the function of the discharge circuit, and under what conditions does it activate?

The discharge circuit activates when VS exceeds ~37V, discharging external blocking capacitors through an internal resistor to prevent overvoltage damage during long standby periods. It operates autonomously without MCU intervention and is distinct from the main power path - ensuring safe operation even if the microcontroller is powered down while VS remains present.

Is daisy-chaining supported, and what are the timing constraints for cascaded devices?

Yes - daisy-chaining is supported by connecting DO of one device to DI of the next. Each device shifts data through its 16-bit register on CLK edges; total frame time scales linearly with device count (e.g., 3 devices require ~3× the time of a single device). CS must be asserted low for the entire chain, and CLK frequency must remain ≤3MHz to meet setup/hold timing across all devices.

How does thermal pre-warning differ from thermal shutdown, and how is pre-warning signaled?

Thermal pre-warning triggers at 120–170°C (configurable hysteresis), setting the TP bit (bit 0) in the output register and pulling DO low on CS falling edge - allowing immediate read without full 16-bit transfer. Thermal shutdown occurs at 150–200°C, disabling all outputs and setting all status bits high. Pre-warning enables predictive thermal management before forced shutdown.

What are the logic voltage compatibility requirements for the serial interface?

The serial interface (DI, CLK, CS, DO) is compatible with both 3.3V and 5V logic families. Input thresholds are ratiometric: low = 0.3×VCC, high = 0.7×VCC. DO output high level is VCC − 0.7V, and leakage current is ±10μA when tri-stated - enabling direct interfacing with common automotive MCUs without level shifters.