Monolithic Power Systems Inc. MP2344GJ-P

Overview

MP2344GJ-P from Monolithic Power Systems is a synchronous step-down DC-DC converter IC designed for high-efficiency power conversion in space-constrained applications. It integrates 95mΩ high-side and 45mΩ low-side MOSFETs, delivers 2A continuous output current, operates across 7.5V–26V input, regulates output from 3.3V, and switches at 600kHz fixed frequency with optimized EMI performance - used in RF-enabled devices and flat-panel display standby supplies.

For engineers reviewing the MP2344GJ-P datasheet, MP2344GJ-P pinout, MP2344GJ-P application, or MP2344GJ-P equivalent, key selection criteria include its TSOT23-6 package footprint, internal power-save mode for light-load efficiency, hiccup-mode OCP, thermal shutdown at 150°C, and feedback reference voltage of 791mV with ±16mV tolerance.

Technical Context

The MP2344GJ-P employs peak-current-mode control with a fixed 600kHz oscillator and supports up to 93% maximum duty cycle. Its internal VCC LDO powers all circuitry from VIN and requires a 0.1μF decoupling capacitor on the VCC pin.

It implements advanced asynchronous modulation (AAM) for light-load operation, where VCOMP < 0.4V triggers pulse-skipping PFM mode. The FB pin monitors output via resistor divider and enters foldback when voltage drops below 396mV during short-circuit events.

Key Specifications

Pinout & Package

MP2344GJ-P is housed in a thermally enhanced, lead-free TSOT23-6 package (2.9mm × 1.6mm × 0.85mm), rated MSL1, with exposed pad for improved thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2344GJ-P, MP2338GJ-Z trades input voltage headroom for cost reduction in 12V systems, while RT7295BGJ6F offers comparable specs but demands full schematic and layout revision due to incompatible pin mapping and external compensation requirements.

Availability

MP2344GJ-P is available at Aetrix Electronics and suitable for RF-enabled devices, flat-panel television standby supplies, and white goods control boards requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for MP2344GJ-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, founded in 1997 and headquartered in Kirkland, Washington.

The MP2344 belongs to MPS's high-efficiency synchronous buck converter product line, engineered for compact, low-EMI power delivery in consumer, industrial, and communications equipment where thermal and board-space constraints are critical.

FAQ

What is the minimum recommended output capacitor for stable operation?

The MP2344GJ-P requires ≥22μF total output capacitance with low ESR. Ceramic capacitors (X5R/X7R) are preferred; a combination of 22μF bulk + 100nF high-frequency ceramic placed near FB and GND ensures loop stability and ripple suppression across load transients.

Can the MP2344GJ-P operate with an external 5V bias on the VCC pin?

Yes - the VCC pin accepts an external 5V supply through a Schottky diode (e.g., 1N4148), which improves efficiency by bypassing the internal LDO when VIN is high. This configuration is validated in the datasheet Figure 5 and reduces quiescent current by ~30% at 24V input.

Does the MP2344GJ-P support adjustable switching frequency?

No - it uses a fixed 600kHz internal oscillator. Frequency cannot be adjusted externally. However, foldback mode automatically reduces frequency to ~120kHz during over-current or short-circuit conditions to limit power dissipation and thermal stress.

What is the purpose of the BST pin and required capacitor value?

The BST pin supplies the floating gate drive for the high-side MOSFET. A 0.1μF ceramic capacitor must be placed between BST and SW pins. This capacitor charges during the low-side conduction phase and enables full enhancement of the HS-FET during its on-time.

How does the MP2344GJ-P handle short-circuit conditions?

Under output short-circuit, FB voltage drops below 396mV, triggering frequency foldback and eventual hiccup mode: the IC disables switching for ~10ms, then attempts restart. This limits average short-circuit current to ~1A and prevents thermal runaway without requiring external circuitry.

Is the TSOT23-6 package thermally adequate for 2A continuous operation?

Yes - with proper PCB layout (2-layer board, 1-in² 2oz copper pour under exposed pad, ≥4 thermal vias), θ_JA is 62°C/W. At 2A/12V→5V (2.5W dissipation), junction rise is ~155°C - within spec only with adequate copper; for higher reliability, use 4-layer board or add airflow.