Monolithic Power Systems Inc. MPQ3522GDE-AEC1-Z

Overview

MPQ3522GDE-AEC1-Z from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified synchronous step-down converter delivering up to 2A output current with 3.3V–20V input range, 1μA shutdown current, and configurable 350kHz–2.5MHz switching frequency. It integrates 70mΩ HS-FET and 50mΩ LS-FET in a QFN-12 (2mm×3mm) wettable-flank package, supporting automotive cold-crank down to 3.1V and featuring power good (PG), frequency foldback, and thermal shutdown. It powers infotainment and ADAS subsystems requiring high efficiency and robust EMC performance.

For engineers reviewing the MPQ3522GDE-AEC1-Z datasheet, MPQ3522GDE-AEC1-Z pinout, MPQ3522GDE-AEC1-Z application, or MPQ3522GDE-AEC1-Z equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive-grade operating limits (–40°C to +150°C), real-world efficiency curves across load and input voltage, and precise alternative part comparisons for design-in decisions.

Technical Context

The MPQ3522GDE-AEC1-Z employs peak current mode control with programmable switching frequency via external resistor on FREQ pin (350kHz–2.5MHz), enabling EMI optimization and layout flexibility. Its advanced asynchronous modulation (AAM) reduces light-load quiescent current to 20μA while maintaining regulation via valley-current detection and zero-current sensing.

It supports low-dropout (LDO) mode during cold-crank, sustaining regulated output at VIN as low as 3.1V, and includes integrated protections: hiccup-mode over-current protection, thermal shutdown at 160°C–185°C, and ±1.5% PG threshold hysteresis referenced to 0.8V FB voltage. The MeshConnect™ flip-chip QFN package enhances thermal dissipation and EMC performance per CISPR25 Class 5.

Key Specifications

Pinout & Package

MPQ3522GDE-AEC1-Z uses a thermally enhanced QFN-12 (2mm×3mm) package with wettable flanks and exposed thermal pad. Pin 1 is marked by dot; top view orientation matches datasheet Figure 3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous step-down converter applications.

Compared with MPQ4572GQ-AEC1-Z and TPS62933QRTERQ1, the MPQ3522GDE-AEC1-Z uniquely balances compact size, cold-crank resilience, and Class 5 EMC compliance - making it optimal for cost- and space-sensitive automotive subsystems demanding 2A at ≤20V.

Availability

MPQ3522GDE-AEC1-Z is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and digital instrument clusters requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.

Supply support for MPQ3522GDE-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, founded in 1997 and headquartered in Kirkland, Washington.

The MPQ3522 belongs to MPS's automotive-grade DC-DC converter product line, designed specifically for harsh-environment vehicle subsystems requiring AEC-Q100 qualification, extended temperature operation, and robust EMC behavior.

FAQ

What is the minimum input voltage required for startup?

The MPQ3522GDE-AEC1-Z requires a minimum VIN of 3.9V to initiate startup due to its UVLO rising threshold of 3.65V (typical). Once running, it sustains regulation down to 3.1V in low-dropout mode, enabling operation during automotive cold-crank events.

How does the frequency spread spectrum (FSS) function impact EMI testing?

FSS modulates switching frequency by ±10% at 15kHz, spreading energy across a bandwidth instead of concentrating at discrete harmonics. This reduces peak conducted and radiated emissions by up to 10dB, helping pass CISPR25 Class 5 without additional LC filters in typical layouts.

Can the MPQ3522GDE-AEC1-Z be used with an adjustable output voltage?

Yes - the device supports both fixed-output versions (e.g., 3.3V, 5V) and adjustable configurations. For adjustable use, connect FB to a resistive divider between VOUT and AGND, setting VOUT = 0.8V × (1 + R1/R2); the FB pin has 100nA max input current, minimizing divider error.

What thermal performance can be expected in a 4-layer PCB layout?

On an 8.3cm×8.3cm, 4-layer board with 2oz copper, θJA is 35.5°C/W. At 2A load and 12V input, case temperature rise is ~25°C above ambient - well within the 150°C max junction limit when ambient stays ≤125°C, assuming adequate copper pour under the thermal pad.

Is the PG pin compatible with 1.8V logic systems?

No - PG is open-drain with 0.3V max low-level voltage at 1mA sink, but requires an external pull-up to the host logic rail (e.g., 1.8V, 3.3V, or 5V). The output high level follows the pull-up voltage, so compatibility depends on the chosen pull-up source, not the IC itself.

Does the device support forced PWM mode to eliminate frequency variation under light load?

No - MPQ3522GDE-AEC1-Z operates exclusively in peak current mode with AAM for light-load efficiency. It does not offer forced PWM or pulse-skipping disable; frequency foldback and AAM are inherent to its architecture and cannot be disabled via pin or register.

What is the recommended inductor DCR for optimal efficiency at 2A?

For 2A continuous output, select an inductor with DCR ≤40mΩ (e.g., 10µH, 40.9mΩ used in typical efficiency plots). Lower DCR reduces conduction loss, especially critical at high ambient temperatures where RDS(ON) increases - verify thermal derating per datasheet Figure 9.