Monolithic Power Systems Inc. MPQ3431CGLE-AEC1-P

Overview

MPQ3431CGLE-AEC1-P from Monolithic Power Systems is a fully integrated, AEC-Q100 Grade 1 qualified synchronous boost converter with 450kHz fixed switching frequency, 2.7V–13V input range, 16V max output, integrated 6mΩ/9.5mΩ MOSFETs, and configurable peak current limit up to 11A - designed for automotive 12V rail boosting, supercapacitor backup, and high-efficiency battery-powered systems.

For engineers reviewing the MPQ3431CGLE-AEC1-P datasheet, MPQ3431CGLE-AEC1-P pinout, MPQ3431CGLE-AEC1-P application, or MPQ3431CGLE-AEC1-P equivalent, this page delivers verified technical context, exact pin functions, real-world load regulation performance, mode-selectable light-load behavior (PSM/FCCM/USM), and automotive-grade thermal protection at 175°C.

Technical Context

The MPQ3431CGLE-AEC1-P implements constant-off-time (COT) control with adaptive loop response, enabling sub-100μs transient recovery under load steps. Its dual-MOSFET architecture eliminates external Schottky diodes while supporting 20W average / 40W peak power delivery from single-cell Li-ion or 3.3V/5V rails.

Three selectable operating modes-pulse-skip (PSM), forced continuous conduction (FCCM), and ultrasonic mode (USM)-are controlled via the MODE pin, with USM enforcing >23kHz minimum switching to suppress audible noise. Peak current limiting is resistor-configurable (7–11A), and internal VDD biasing supports start-up down to 0.9V VIN when externally biased.

Key Specifications

Pinout & Package

MPQ3431CGLE-AEC1-P is housed in a wettable-flank QFN-13 package (3mm × 4mm, 0.5mm pitch), optimized for automotive reflow inspection and thermal dissipation via exposed PGND pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS61088RHLR and MAX20414ATPA/VY+, MPQ3431CGLE-AEC1-P uniquely balances automotive qualification, ultrasonic noise suppression, and 95% efficiency at 20W - making it optimal for cost-sensitive, thermally constrained infotainment and ADAS power stages.

Availability

MPQ3431CGLE-AEC1-P is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS camera modules, and telematics power management requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.

Supply support for MPQ3431CGLE-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 MPQ3431C product line targets automotive-grade DC-DC conversion, emphasizing integration, thermal robustness, and mode-flexible efficiency for next-generation vehicle electrification and ADAS subsystems.

FAQ

What is the minimum input voltage required to start up MPQ3431CGLE-AEC1-P without external VDD bias?

The MPQ3431CGLE-AEC1-P starts up autonomously from VIN ≥2.7V when no external bias is applied to VDD. If an external 3V bias is supplied to VDD, startup is guaranteed down to VIN = 0.9V - critical for automotive cold-crank (6.0V) and stop-start (6.5V) scenarios where input dips below nominal 12V.

How does the MODE pin affect efficiency and noise in light-load conditions?

When MODE is floating or set to 0.9–1.2V, the device enters ultrasonic mode (USM), maintaining >23kHz switching to eliminate audible coil whine while retaining >85% efficiency at 100mA load. In contrast, pulse-skip mode (MODE <0.7V) improves light-load efficiency to >90% but risks audible noise below 20kHz; FCCM (MODE >1.6V) ensures lowest output ripple but reduces efficiency to ~78% at 100mA.

Can MPQ3431CGLE-AEC1-P regulate output voltage higher than 16V?

No. The internal over-voltage protection (OVP) triggers at 16.5V with 0.2V hysteresis, clamping VOUT to prevent damage. The maximum rated output is 16V - exceeding this violates absolute maximum ratings and may cause permanent failure. For >16V applications, a secondary regulation stage or different topology is required.

What is the purpose of the BST capacitor, and what value is recommended?

The BST capacitor (typically 0.1μF X7R ceramic) forms a bootstrap circuit between BST and SW pins to generate gate drive voltage for the high-side MOSFET. It must be placed adjacent to the IC with short, low-inductance traces. Insufficient BST capacitance causes HS-FET turn-on failure, leading to excessive conduction loss and thermal shutdown.

How is peak switching current configured, and what resistor yields 9A limit?

Peak current is set by a resistor from ILIM to AGND. Per datasheet Figure 10, RLIM = 36kΩ yields 9A typical peak current. The relationship is linear: RLIM = 324kΩ/A. A 36kΩ ±1% resistor ensures ±5% current limit accuracy across temperature, enabling precise overload protection without external sensing.

Does MPQ3431CGLE-AEC1-P support output disconnect or reverse current blocking?

No. The MPQ3431CGLE-AEC1-P lacks integrated reverse-current blocking. When VIN drops below VOUT, the HS-FET body diode conducts, allowing backfeed from VOUT to VIN. For applications requiring output isolation, an external PFET or ideal diode controller must be added in series with VOUT.

What PCB layout practices are critical for thermal performance?

Maximize copper area on the exposed PGND pad (pin 7) using ≥4 thermal vias to inner ground planes. Keep SW, BST, and VOUT traces wide and short to minimize switching loop inductance. Separate AGND and PGND pours, connecting them at a single point near the IC. Place input/output capacitors within 3mm of respective pins.