Monolithic Power Systems Inc. MPQ4323CGRHE-33-AEC1-P

Overview

MPQ4323CGRHE-33-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 3A continuous output current. It operates from 3.3V to 36V input, withstands 42V automotive load dump, supports cold-crank down to 3.1V, and features configurable switching frequency (350kHz–2.5MHz) for EMI optimization in automotive infotainment and ADAS power rails.

For engineers reviewing the MPQ4323CGRHE-33-AEC1-P datasheet, MPQ4323CGRHE-33-AEC1-P pinout, MPQ4323CGRHE-33-AEC1-P application, or MPQ4323CGRHE-33-AEC1-P equivalent, key selection considerations include its QFN-14 (2.5mm×3.5mm) wettable flank package, 1μA shutdown current, ±1.5% FB voltage accuracy over temperature, 65ns minimum on-time, and CISPR25 Class 5 radiated/conducted emissions compliance.

Technical Context

The MPQ4323CGRHE-33-AEC1-P implements peak current mode control with frequency foldback during start-up to prevent inductor current runaway. Its internal gate drivers support high duty cycle operation and low-dropout mode for automotive cold-crank conditions, while symmetric VIN pinout and spread-spectrum modulation reduce EMI.

It integrates thermal shutdown (160°C–185°C trip range), hiccup-mode over-current protection, and open-drain power-good monitoring with 94.5%–105.5% output voltage window detection. The device uses a MeshConnect™ flip-chip QFN-14 package optimized for thermal performance and solder joint reliability in automotive under-hood environments.

Key Specifications

Pinout & Package

MPQ4323CGRHE-33-AEC1-P is housed in a QFN-14 (2.5mm × 3.5mm) wettable flank package with exposed thermal pad, optimized for high-density automotive PCB layouts and automated optical inspection (AOI).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ4323CGDE-AEC1, this QFN-14 variant offers superior thermal resistance (θJA = 48.6°C/W) and wettable flank inspection capability, while MPQ4323CGLE-AEC1 trades slightly larger area for enhanced thermal mass-making MPQ4323CGRHE-33-AEC1-P optimal for balanced automotive EMI, thermal, and manufacturability requirements.

Availability

MPQ4323CGRHE-33-AEC1-P is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, instrument clusters, and industrial telematics requiring stable component supply with AEC-Q100 qualification and long-term production continuity.

Supply support for MPQ4323CGRHE-33-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 MPQ4323C product line delivers compact, high-efficiency synchronous buck converters engineered specifically for automotive-grade power conversion in harsh environments, emphasizing load dump resilience, wide temperature operation, and EMI robustness.

FAQ

What is the fixed output voltage of MPQ4323CGRHE-33-AEC1-P?

The "-33" suffix denotes a factory-trimmed fixed 3.3V output version. The internal feedback divider sets VOUT = 3.3V with ±1.5% accuracy over -40°C to +150°C junction temperature, eliminating external resistors and reducing BOM count.

Does MPQ4323CGRHE-33-AEC1-P require an external bootstrap capacitor?

Yes - a 0.1μF X7R ceramic capacitor must be placed between BOOT and SW pins. This capacitor supplies gate drive energy for the high-side MOSFET and must be located within 2mm of both pins to minimize parasitic inductance and prevent shoot-through.

How is the switching frequency configured on this part?

Frequency is set by connecting a resistor from the FREQ pin to GND. For MPQ4323CGRHE-33-AEC1-P, typical values are 86.6kΩ (415kHz), 34.8kΩ (1MHz), or 15kΩ (2.2MHz). The device supports spread-spectrum modulation by default to reduce EMI peaks.

What does the "AEC1-P" suffix indicate?

"AEC1" confirms AEC-Q100 Grade 1 qualification (–40°C to +125°C ambient / –40°C to +150°C junction), while "-P" denotes tape-and-reel packaging (per MPS ordering convention). The part undergoes full automotive stress testing including HTOL, TC, and UHAST.

Can MPQ4323CGRHE-33-AEC1-P operate in forced continuous conduction mode (FCCM)?

Yes - FCCM is enabled by default and cannot be disabled. This ensures constant switching frequency and minimal output voltage ripple across all load conditions, critical for noise-sensitive analog and RF circuits in automotive systems.

Is the PG (power good) signal active-high or open-drain?

The PG pin is open-drain. It requires an external pull-up resistor (typically 10kΩ to VOUT or VCC) to assert a logic-high signal when output voltage is within 94.5%–105.5% of 3.3V. During fault or startup, PG remains low (sinking up to 1mA).

What is the thermal resistance (θJA) of the QFN-14 package on a standard 4-layer board?

Measured per JESD51-7 on a 4-layer 8.3cm×8.3cm evaluation board with 2oz copper, θJA is 48.6°C/W. With proper thermal vias under the exposed pad, actual system θJA can improve to ≤34°C/W, enabling full 3A output at +85°C ambient.