Monolithic Power Systems Inc. MPQ4345GLE-5-AEC1-Z

Overview

MPQ4345GLE-5-AEC1-Z from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified synchronous step-down converter delivering 5V fixed output at up to 2A continuous current, with 3.3V–36V input range, 42V load dump tolerance, and 1μA shutdown quiescent current. It integrates 60mΩ high-side and 35mΩ low-side MOSFETs, supports cold-crank down to 3.1V, and operates from –40°C to +150°C junction temperature - deployed in automotive infotainment power rails.

For engineers reviewing the MPQ4345GLE-5-AEC1-Z datasheet, MPQ4345GLE-5-AEC1-Z pinout, MPQ4345GLE-5-AEC1-Z application, or MPQ4345GLE-5-AEC1-Z equivalent, key selection criteria include its ultra-low IQ sleep mode (3µA), configurable 350kHz–2.5MHz switching frequency, AAM/FCCM mode control via SYNCIN/MODE, and wettable-flank QFN-17 package for automotive-grade solder joint inspection.

Technical Context

This buck regulator uses zero-delay PWM control with internal gate drivers and a mesh-connected flip-chip QFN-17 package to minimize EMI and improve thermal performance. Its dual-mode operation-Advanced Asynchronous Modulation (AAM) under light loads and Forced Continuous Conduction Mode (FCCM) under heavy loads-is selected by pulling SYNCIN/MODE high or low.

The device implements integrated protections including over-current (HS/LS valley detection), thermal shutdown (150°C trip), input OVP (38V), and precise power-good monitoring (±6% window). Its low-dropout mode enables stable 5V regulation during automotive cold-crank events where VIN drops to 3.1V.

Key Specifications

Pinout & Package

MPQ4345GLE-5-AEC1-Z is housed in a thermally enhanced, wettable-flank QFN-17 (3mm × 4mm) package with exposed thermal pad. Pin numbering follows top-view orientation as defined in MPS datasheet Rev. 1.0.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck converter applications.

Compared with MPQ4345JGLE-5-AEC1-Z, the QFN-17 variant saves board space and reduces routing complexity; versus TPS62933RTER, it delivers certified automotive reliability and 42V load dump immunity at the cost of 1A lower current rating.

Availability

MPQ4345GLE-5-AEC1-Z is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and digital instrument clusters requiring stable component supply across extended temperature and long product lifecycles.

Supply support for MPQ4345GLE-5-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 distribution through authorized partners.

The MPQ4345 series belongs to MPS's automotive-grade DC-DC converter portfolio, engineered specifically for harsh-temperature, high-reliability vehicle subsystems including infotainment, ADAS, and body electronics.

FAQ

What is the maximum allowable input voltage for continuous operation?

The MPQ4345GLE-5-AEC1-Z supports continuous operation up to 36V input. Its absolute maximum rating is 42V, enabling survival during ISO 7637-2 Pulse 5a load dump events - but sustained operation above 36V may trigger overvoltage protection and shut down the device.

How does the SYNCIN/MODE pin affect efficiency and noise performance?

Pulling SYNCIN/MODE low enables Advanced Asynchronous Modulation (AAM), skipping pulses under light loads to maintain >85% efficiency at 10mA. Pulling it high forces FCCM, delivering constant-frequency, low-EMI operation ideal for noise-sensitive analog circuits - at the cost of ~5% lower light-load efficiency.

Can the MPQ4345GLE-5-AEC1-Z regulate correctly during cold-crank conditions?

Yes. The device enters low-dropout (LDO) mode when VIN falls below ~5.5V, sustaining regulated 5V output down to VIN = 3.1V for ≥100ms - verified per ISO 16750-2 cold-crank profile - without dropout or reset.

What is the purpose of the DNU pin, and how must it be connected?

Pin 13 is designated Do-Not-Use (DNU) and must be connected directly to the VCC pin. Leaving it floating or connecting it elsewhere violates the internal bias network and may cause startup failure, erratic regulation, or thermal runaway.

Is external compensation required for stability with standard 2.2µH inductors?

No. The MPQ4345GLE-5-AEC1-Z uses internal compensation optimized for common inductor values (2.2µH to 10µH) and output capacitors (10µF–47µF ceramic). Stability is guaranteed across the full operating range without external RC networks.

Does the PG signal indicate overvoltage or undervoltage conditions independently?

Yes. The open-drain PG pin asserts low if VOUT falls below 93% (4.65V) or rises above 107% (5.35V) of nominal 5V - providing independent fault detection for both under- and overvoltage events, with 50µs response delay in either direction.

What thermal derating applies at 100°C ambient temperature?

With θJA = 44.7°C/W on a 4-layer JEDEC board, the maximum continuous power dissipation at TA = 100°C is 1.12W. At 2A load and 5V output, this corresponds to ~225mA max input current at 36V - requiring careful PCB copper area design or forced airflow for full-load operation above 85°C ambient.