Monolithic Power Systems Inc. MP2349GG-P

Overview

MP2349GG-P from Monolithic Power Systems is a fully integrated, synchronous buck converter delivering up to 6.5A continuous output current with 4.5V–24V input range, 700kHz fixed switching frequency, and adaptive constant-on-time (COT) control. It integrates low-R_DS(ON) MOSFETs (36mΩ HS / 12mΩ LS), supports mode selection (FCCM/PFM/USM), and targets compact, high-efficiency power rails in security cameras and flat-panel displays.

For engineers reviewing the MP2349GG-P datasheet, MP2349GG-P pinout, MP2349GG-P application, or MP2349GG-P equivalent, key selection criteria include its 105μA quiescent current, QFN-11 (2mm×2mm) thermal performance (θ_JA = 80°C/W), remote differential sense capability, and valley-current-based over-current protection with 6–9A adjustable limit.

Technical Context

The MP2349GG-P implements adaptive COT control with DC auto-tune loop and internal ramp compensation, enabling stable regulation with ceramic or POSCAP output capacitors without external compensation. Its valley-current sensing OCP uses internal MOSFET R_DS(ON) for cycle-by-cycle current limiting, while the MODE pin selects between FCCM (fixed f_SW), PFM with ultrasonic mode (≥20kHz at light load), or PFM without USM.

It features dual UVLO thresholds (VIN: 4.35V rising, VCC: 3.3V rising), 600–800kHz f_SW tolerance in FCCM, and soft-start time of 1.1–2.3ms. The functional block includes integrated BST driver, output discharge, and remote AGND/Kelvin feedback for precise load regulation across temperature (±0.5% V_REF drift from −40°C to +125°C).

Key Specifications

Pinout & Package

MP2349GG-P is housed in a thermally enhanced QFN-11 package (2mm × 2mm, 0.5mm pitch) with exposed thermal pad. The package supports ≤3.6W continuous power dissipation at T_A = 25°C and requires ≥4 thermal vias under the pad for optimal θ_JA performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2349GG-P, MP2338GJ-Z trades mode flexibility and thermal density for lower cost and simpler layout, while RT7295BGJ8F offers comparable current but requires external components for features MP2349GG-P integrates-making MP2349GG-P optimal for space-, noise-, and efficiency-constrained designs.

Availability

MP2349GG-P is available at Aetrix Electronics and suitable for security cameras, portable xDSL modems, digital set-top boxes, and flat-panel display logic rails requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for MP2349GG-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 over 20 years of expertise in DC/DC conversion, motor drivers, and LED lighting controllers.

The MP2349GG-P belongs to MPS's high-density synchronous buck converter product line, designed specifically for compact, high-efficiency point-of-load regulation in imaging, broadband, and display systems where thermal, acoustic, and layout constraints dominate.

FAQ

What is the minimum recommended output capacitance for stable operation?

The MP2349GG-P is stable with ≥44μF total output capacitance using POSCAP or ceramic types. For ceramic-only designs, use ≥22μF X7R/X5R with ESR <5mΩ; the internal DC auto-tune loop eliminates need for external type-II compensation, simplifying layout and reducing component count.

How does the MODE pin affect efficiency and noise performance?

When MODE is grounded, the device operates in PFM-only mode-maximizing light-load efficiency but allowing switching frequency to drop into audible range (<20kHz). When floated, it enables PFM+USM, clamping minimum f_SW above 20kHz to eliminate coil whine while retaining >85% efficiency at 1mA load.

Can MP2349GG-P regulate output voltages below 0.6V?

No-the internal reference is fixed at 600mV ±10mV, and the FB pin requires a resistive divider that scales V_OUT to this reference. The lowest supported V_OUT is 0.6V; attempting lower values violates the FB input range and causes regulation failure or instability.

What is the purpose of the AGND pin, and how should it be routed?

AGND provides a dedicated Kelvin return path for the FB resistor divider, isolating feedback sensing from high-current PGND noise. It must be connected directly to the FB divider's ground node via a short, isolated trace-not tied to PGND-and kept >5mm away from SW and inductor traces to prevent coupling errors.

Does MP2349GG-P support pre-biased output startup?

Yes-the IC detects pre-biased V_OUT during startup and disables both HS- and LS-FETs until the internal VREF ramps above the sensed FB voltage. This prevents reverse current flow and ensures monotonic V_OUT rise, protecting downstream circuits during hot-swap or backup power scenarios.

What thermal derating applies above 25°C ambient?

Using θ_JA = 80°C/W (QFN-11), maximum continuous power drops linearly: at 60°C ambient, max power = (150°C − 60°C) / 80°C/W = 1.125W, supporting ~3.5A at 3.3V. For full 6.5A operation above 60°C, add ≥4 thermal vias and 2oz copper to the thermal pad layer per JEDEC JESD51-7 guidelines.

Is an external bootstrap capacitor required, and what value is recommended?

Yes-a 0.1μF X7R ceramic capacitor is mandatory between BST and SW pins to sustain HS-FET gate drive. Place it within 2mm of the pins with short, wide traces; insufficient BST capacitance causes HS-FET dropout, increased R_DS(ON), and thermal runaway under heavy load.