Monolithic Power Systems Inc. MPQ4313GRE-AEC1-P

Overview

MPQ4313GRE-AEC1-P from Monolithic Power Systems is a 45V, 3A AEC-Q100 Grade 1 synchronous step-down converter with integrated 48mΩ high-side and 20mΩ low-side MOSFETs, frequency spread spectrum (FSS), and programmable 350–1000kHz switching. It delivers high efficiency across automotive input ranges (3.3V–45V) and supports cold-crank operation via low-dropout mode. Used in infotainment power rails requiring <1.7μA shutdown current and EMI-compliant CISPR25 Class 5 emissions.

For engineers reviewing the MPQ4313GRE-AEC1-P datasheet, MPQ4313GRE-AEC1-P pinout, MPQ4313GRE-AEC1-P application, or MPQ4313GRE-AEC1-P equivalent, key selection criteria include AEC-Q100 qualification, FSS-enabled EMI reduction, dual-mode light-load control (AAM/FCCM), and wettable-flank QFN-20 package for automated optical inspection in automotive PCB assembly.

Technical Context

The MPQ4313GRE-AEC1-P implements current-mode control with 100ns minimum on-time and frequency foldback during startup to prevent inductor current runaway. Its internal gate drivers support high-duty-cycle operation under automotive cold-crank conditions (VIN down to 3.3V), while symmetric VIN routing and FSS reduce conducted and radiated EMI per CISPR25 Class 5.

It integrates dual feedback paths: one for regulation (0.815V reference at FB) and another for power-good monitoring (95–105% VOUT window at open-drain PG). The MODE pin selects between Advanced Asynchronous Mode (AAM) for ultra-low IQ or Forced Continuous Conduction Mode (FCCM) for fixed-frequency noise control.

Key Specifications

Pinout & Package

MPQ4313GRE-AEC1-P uses a thermally enhanced QFN-20 (4mm × 4mm) package with exposed thermal pad and wettable flank leads for solder joint inspection. Pin numbering follows standard top-view orientation with Pin 1 at bottom-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ4312GRE-AEC1-P, the MPQ4313GRE-AEC1-P delivers 50% higher output current in the same footprint; versus LM61480QRNLRQ1, it offers integrated FSS and wettable flanks at lower total BOM cost and smaller PCB area despite lower peak current.

Availability

MPQ4313GRE-AEC1-P is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and digital instrument clusters requiring stable component supply with AEC-Q100 Grade 1 qualification and long-term production support.

Supply support for MPQ4313GRE-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.

The MPQ4313 belongs to MPS's automotive-grade DC-DC converter product line, engineered specifically for harsh-temperature, high-reliability automotive subsystems requiring AEC-Q100 qualification, low EMI, and extended battery-life operation.

FAQ

What is the purpose of the MODE pin, and how should it be configured?

The MODE pin selects between Advanced Asynchronous Mode (AAM) for ultra-low quiescent current (18μA) at light loads and Forced Continuous Conduction Mode (FCCM) for fixed-frequency operation. Pull MODE high (>1.8V) for FCCM; pull low (<0.4V) for AAM. Leaving it floating causes undefined behavior and must be avoided.

Does MPQ4313GRE-AEC1-P support external synchronization, and what are the valid frequency ranges?

Yes - the SYNCIN pin accepts an external clock from 350kHz to 1000kHz to synchronize the internal oscillator. The SYNCO pin outputs a 180° phase-inverted copy of the internal or synced clock. This enables deterministic noise alignment across multiple rails in complex automotive ECUs.

How does the frequency spread spectrum (FSS) function improve EMI performance?

FSS modulates the switching frequency over a ±20–50kHz band, spreading spectral energy and reducing peak amplitudes by up to 15dB. This allows the MPQ4313GRE-AEC1-P to meet CISPR25 Class 5 radiated and conducted emission limits without additional ferrite beads or common-mode chokes in most layouts.

What is the recommended layout practice for the PGND and AGND connections?

PGND pins (4,5,10,11) must connect directly to the thermal pad and form a low-inductance, high-current return path for the SW node. AGND (Pin 17) should be routed separately and joined to PGND at a single point near the IC to prevent noise coupling into the feedback loop.

Can MPQ4313GRE-AEC1-P operate during automotive cold-crank conditions?

Yes - its wide 3.3V–45V input range and low-dropout mode maintain regulation even when battery voltage drops to 6V during engine cranking. Combined with 170°C thermal shutdown and hiccup OCP, it ensures robust operation in start-stop and cold-engine scenarios.

What is the function of the NC pin (Pin 15), and how must it be handled?

Pin 15 is not internally connected but must be tied to VCC or VOUT (≥3V) to prevent floating. Leaving it unconnected risks internal leakage paths that may degrade startup reliability or cause erratic enable behavior under temperature stress.

How is soft-start duration determined, and what capacitor value achieves a 5ms ramp?

Soft-start time is set by a 6μA current source charging an external capacitor from SS to GND. For a 5ms ramp to full output, use C_SS = (6μA × 5ms) / 0.815V ≈ 37nF. Standard values like 33nF or 47nF provide close approximation with minimal impact on inrush control.