Monolithic Power Systems Inc. MPQ4314GRE-33-AEC1-Z

Overview

MPQ4314GRE-33-AEC1-Z from Monolithic Power Systems is a 45V, 4A AEC-Q100 Grade 1 synchronous step-down converter with fixed 3.3V output, integrated 48mΩ HS-FET and 20mΩ LS-FET, 350–1000kHz programmable switching frequency, and frequency spread spectrum (FSS) for low EMI. It delivers high efficiency across load range in automotive infotainment power rails and supports cold-crank operation via low-dropout mode.

For engineers reviewing the MPQ4314GRE-33-AEC1-Z datasheet, MPQ4314GRE-33-AEC1-Z pinout, MPQ4314GRE-33-AEC1-Z application, or MPQ4314GRE-33-AEC1-Z equivalent, key selection criteria include AEC-Q100 qualification, 1.7μA shutdown current, 18μA sleep-mode IQ, 100ns minimum on-time, and wettable flank QFN-20 package for automated optical inspection.

Technical Context

The MPQ4314GRE-33-AEC1-Z uses current-mode control with internal MOSFETs to achieve fast transient response and stable regulation under wide input (3.3–45V) and temperature (−40°C to +150°C) conditions. Its dual modulation modes-Advanced Asynchronous Modulation (AAM) for light-load efficiency and Forced Continuous Conduction Mode (FCCM) for low-noise operation-are selected via the MODE pin.

It integrates frequency foldback at startup to prevent inductor current runaway, hiccup-mode over-current protection, thermal shutdown at 170°C, and an open-drain power-good (PG) signal with ±5% window and 35μs delay. Synchronization capability (SYNCIN/SYNCO) enables phase-shifted multi-rail designs while FSS reduces peak EMI emissions per CISPR25 Class 5.

Key Specifications

Pinout & Package

MPQ4314GRE-33-AEC1-Z is housed in a wettable flank QFN-20 (4mm × 4mm) package, enabling reliable solder-joint inspection in automotive production. Thermal resistance θJA = 44°C/W (JESD51-7, 4-layer PCB) supports 4A operation with minimal heatsinking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ4314GRE-33-AEC1-Z, the adjustable MPQ4314GRE-AEC1-Z adds design flexibility at the cost of two external resistors and tighter layout constraints, while the 5A MPQ4315GRE-33-AEC1-Z provides headroom for higher sustained loads without changing PCB layout.

Availability

MPQ4314GRE-33-AEC1-Z is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and digital instrument clusters requiring stable component supply with AEC-Q100 traceability and extended temperature support.

Supply support for MPQ4314GRE-33-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 core expertise in DC/DC conversion, motor drivers, and LED lighting solutions.

The MPQ4314 family targets automotive power systems requiring AEC-Q100 qualification, low quiescent current, and robust EMI performance - designed specifically for infotainment, cluster, and ADAS subsystems operating in harsh environments.

FAQ

What is the purpose of the MODE pin on MPQ4314GRE-33-AEC1-Z?

The MODE pin selects between Advanced Asynchronous Modulation (AAM) and Forced Continuous Conduction Mode (FCCM). Pulling it low enables AAM for highest light-load efficiency; pulling it high forces FCCM for constant-frequency operation and lower output ripple. Floating is prohibited - a defined logic level must be applied via resistor or controller GPIO.

Does MPQ4314GRE-33-AEC1-Z require external feedback resistors?

No. The "-33" suffix denotes a factory-trimmed fixed 3.3V output version. The internal feedback divider is laser-trimmed to achieve ±2% output accuracy, eliminating external resistors and associated layout sensitivity. The FB pin (Pin 18) is internally connected and unused in this variant.

How does the wettable flank feature benefit automotive manufacturing?

The wettable flank QFN-20 package exposes vertical metal sidewalls on all four edges, enabling automated optical inspection (AOI) of solder joint quality after reflow. This is mandatory for zero-defect automotive production lines and improves process yield verification compared to standard QFN packages.

Can MPQ4314GRE-33-AEC1-Z operate during automotive cold-crank conditions?

Yes. Its low-dropout mode maintains regulation down to VIN ≈ VOUT + 0.5V, supporting operation at 6V input while delivering 3.3V output. Combined with 45V absolute maximum input rating and AEC-Q100 Grade 1 qualification, it withstands cold-crank, load-dump, and reverse-battery stress per ISO 16750-2.

What is the function of the SYNCO pin, and when should it be used?

SYNCO outputs a clock signal 180° out-of-phase with the internal oscillator or external SYNCIN signal. It is used to synchronize multiple MPQ4314 devices in interleaved configurations, reducing input/output ripple and EMI. If unused, the pin must be left floating - no pull-up or pull-down is required.

How is power-good (PG) behavior defined for this device?

PG is an open-drain output that goes high when VOUT is within 95%–105% of nominal 3.3V (i.e., 3.135V–3.465V), and low when outside 93.5%–106.5% (3.0855V–3.5145V). It has 35μs rising/falling delays and requires an external pull-up resistor to a valid logic supply (e.g., 3.3V or 5V).

Is frequency spread spectrum (FSS) enabled by default?

Yes. FSS is internally enabled and cannot be disabled. It modulates the switching frequency around the programmed center value to spread spectral energy, directly lowering peak EMI emissions - a key enabler for meeting CISPR25 Class 5 without additional filtering components.