Monolithic Power Systems Inc. MPQ3522GDE-AEC1-P

Overview

MPQ3522GDE-AEC1-P from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified, synchronous step-down DC/DC converter with integrated 70mΩ high-side and 50mΩ low-side MOSFETs, delivering up to 2A output current across a 3.3V–20V input range. It features configurable switching frequency (350kHz–2.5MHz), 1μA shutdown current, and low-dropout mode for automotive cold-crank operation down to 3.1V VIN. It is deployed in ADAS camera modules requiring stable 3.3V or 5V rail generation under wide temperature and EMI-constrained conditions.

For engineers reviewing the MPQ3522GDE-AEC1-P datasheet, MPQ3522GDE-AEC1-P pinout, MPQ3522GDE-AEC1-P application, or MPQ3522GDE-AEC1-P equivalent, key selection criteria include cold-crank support (3.1V min VIN), CISPR25 Class 5 EMI compliance, wettable-flank QFN-12 package for automated optical inspection, and programmable frequency via external resistor.

Technical Context

The MPQ3522GDE-AEC1-P uses peak current mode control with frequency foldback during start-up to prevent inductor current runaway. Its advanced asynchronous modulation (AAM) dynamically scales switching frequency under light load to minimize gate driver and switching losses, enabling 20μA quiescent current in sleep mode.

It integrates dual MOSFETs with 65ns minimum on-time and 50ns minimum off-time, supporting high duty-cycle operation up to 99.5% and seamless transition into LDO-like low-dropout mode when VIN approaches VOUT - critical for automotive battery transients. The open-drain PG signal monitors output regulation within ±5.5% window and includes deglitching (70µs rising / 60µs falling).

Key Specifications

Pinout & Package

The MPQ3522GDE-AEC1-P is housed in a thermally enhanced QFN-12 (2mm × 3mm) package with wettable flanks for solder joint inspection. Exposed thermal pad on underside improves heat dissipation (θJC = 7.3°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ4420AGQ-AEC1-P and TPS543320RHLT, the MPQ3522GDE-AEC1-P uniquely combines AEC-Q100 Grade 1 qualification, CISPR25 Class 5 compliance, and wettable-flank packaging - making it the only option certified for safety-critical ADAS power rails without additional EMI mitigation.

Availability

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

Supply support for MPQ3522GDE-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 MPQ3522 belongs to MPS's automotive-grade DC/DC converter product line, engineered specifically for harsh-temperature, high-reliability vehicle subsystems including ADAS, infotainment, and body electronics - emphasizing EMI robustness, cold-crank resilience, and AEC-Q100 compliance.

FAQ

What is the minimum input voltage required for startup?

The MPQ3522GDE-AEC1-P starts switching when VIN rises above 3.65V (typical UVLO rising threshold). It continues regulation down to 3.1V after startup due to its low-dropout mode, enabling operation during automotive cranking events.

Does this part support adjustable output voltage?

Yes - the MPQ3522GDE-AEC1-P is the adjustable-output version. Output voltage is set via an external resistor divider connected to the FB pin, with a 0.8V internal reference. Fixed-output variants (e.g., 3.3V, 5V) are also available under different part numbers.

How is EMI performance achieved without external filters?

EMI suppression is achieved through integrated frequency spread spectrum (FSS) modulation (±10% span), symmetric VIN pinout reducing loop area, and MeshConnect™ flip-chip packaging minimizing parasitic inductance - collectively enabling CISPR25 Class 5 compliance per test data on standard evaluation boards.

What thermal derating applies at 150°C ambient?

At TA = 150°C, maximum continuous output current is limited by thermal design. With θJA = 35.5°C/W on the standard 4-layer EVB, the junction temperature reaches 150°C at approximately 1.1A load - requiring careful PCB copper area and airflow planning for full 2A operation at high ambient.

Is the PG pin compatible with 1.8V logic systems?

Yes - the PG pin is open-drain and requires an external pull-up. When pulled to 1.8V, it asserts high at ≥1.7V (94.5% of 1.8V) and releases below ~1.67V (93% of 1.8V), meeting typical 1.8V I/O thresholds with appropriate pull-up resistor selection.

Can the FREQ pin be left unconnected?

No - the FREQ pin must be connected to ground via a resistor to set the switching frequency. An unconnected FREQ pin results in undefined fSW and potential instability. Resistor values from 10kΩ to 100kΩ configure fSW between 2.2MHz and 350kHz respectively.

What is the purpose of the dual VIN and PGND pins?

Dual VIN and PGND pins reduce impedance in high-current paths: separate VIN pins allow localized decoupling near each pin, while dual PGND pins lower ground bounce and improve current return path integrity - both critical for maintaining regulation accuracy and EMI performance at 2A load.