Monolithic Power Systems Inc. MP2494DN-LF-P

Overview

MP2494DN-LF-P from Monolithic Power Systems is a monolithic 2A, 55V input, 100kHz fixed-frequency step-down DC/DC converter with internal 0.25Ω MOSFET switch, 0.8V reference voltage, and cycle-by-cycle current limiting-designed for automotive cigarette lighter adapters and USB power supplies operating from 4.5V to 55V input.

For engineers reviewing the MP2494DN-LF-P datasheet, MP2494DN-LF-P pinout, MP2494DN-LF-P application, or MP2494DN-LF-P equivalent, this page delivers verified package mapping (SOIC8E), thermal resistance (θJA = 50°C/W), soft-start control via SS pin, bootstrap gate drive architecture, and validated alternative options for 55V buck conversion designs.

Technical Context

The MP2494DN-LF-P implements current-mode control with integrated error amplifier, slope compensation, and 100kHz oscillator-enabling stable regulation across 0.8V–45V output with ±2% feedback accuracy. Its internal 0.25Ω high-side MOSFET supports continuous 2A load at up to 92% efficiency in typical configurations.

Protection logic includes cycle-by-cycle current limiting (3.5A typ), thermal shutdown at 150°C, and UVLO with 3.3V threshold and 200mV hysteresis. The bootstrap (BST) and switch (SW) pins form a floating gate drive path, requiring external 10nF BST capacitor and optional Schottky diode for high-duty-cycle operation.

Key Specifications

Pinout & Package

MP2494DN-LF-P is housed in an SOIC8E package (JEDEC MS-012, variation BA), with 1.27mm pitch, 5.0mm × 6.2mm body, and θJA = 50°C/W on 4-layer PCB. Pin 1 marked by notch or dot; exposed pad not present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM5164QWRGRRQ1 and TPS54260DGQR, MP2494DN-LF-P offers superior thermal dissipation (2.5W SOIC8E rating vs. 1.5W typical for alternatives), tighter FB accuracy (±2% vs. ±3%), and proven low-EMI behavior-making it optimal for space- and noise-sensitive 2A buck designs.

Availability

MP2494DN-LF-P is available at Aetrix Electronics and suitable for automotive cigarette lighter adapters, industrial 24V-to-12V converters, and USB power supply modules requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle support.

Supply support for MP2494DN-LF-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 analog and mixed-signal ICs for power management, motion control, and interface applications.

The MP2494 belongs to MPS's high-voltage buck converter product line, engineered for rugged industrial and automotive power conversion where input transients, thermal constraints, and EMI compliance are critical design factors.

FAQ

What is the maximum recommended output current for MP2494DN-LF-P in SOIC8E package at 85°C ambient?

The MP2494DN-LF-P delivers 2A continuous output current at TA = 25°C. At 85°C ambient, derating applies: with θJA = 50°C/W and TJ(MAX) = 125°C, maximum allowable power dissipation is 2.0W. Given typical 88% efficiency at 12V→5V, this supports ~1.8A continuous output before thermal shutdown activates.

Can MP2494DN-LF-P operate with 3.3V input?

No. The MP2494DN-LF-P has a minimum input voltage of 4.5V per its absolute maximum ratings and recommended operating conditions. Below 4.5V, UVLO prevents startup, and internal bias circuitry cannot sustain regulation. For 3.3V input, consider MPS's MP2451 or MP9486 series.

Is an external bootstrap diode required for MP2494DN-LF-P?

An external bootstrap diode (e.g., BAT54) is recommended-not required-for duty cycles above 65%, output voltages above 12V, or fixed 5V input applications. It improves gate drive strength and efficiency by supplementing the internal bootstrap regulator, especially under high-load or high-temperature conditions.

What is the purpose of the GS pin, and how should it be connected?

The GS (Ground Sense) pin provides a Kelvin connection to the true power ground, isolating current-sense measurement from switching noise on the main GND trace. It must be tied directly to the same low-impedance ground plane used by the input capacitor's negative terminal-not routed through shared copper or vias.

Does MP2494DN-LF-P support synchronization to an external clock?

No. MP2494DN-LF-P features a fixed 100kHz internal oscillator with no SYNC pin or frequency adjustment capability. For synchronizable buck converters, refer to MPS's MPQ4312-A or MPQ4363-A families, which offer external clock input and programmable frequency range.

How does the SS (Soft-Start) pin function, and what capacitor value is typical?

The SS pin controls startup ramp rate by charging an external capacitor; the internal current source charges it linearly, delaying FB loop activation until the SS voltage reaches ~1.2V. A 100nF capacitor yields ~10ms soft-start time-sufficient to limit inrush into typical 220μF output banks without compromising transient response.

What is the minimum recommended inductor value for MP2494DN-LF-P at 2A load?

MPS recommends 33µH to 47µH for most 2A applications. Using the ripple-current equation with ΔIL ≈ 0.6A (30% of 2A), VIN = 12V, VOUT = 5V, and fSW = 100kHz, the calculated minimum inductance is ~31µH. A 33µH/3A shielded power inductor with DCR < 200mΩ meets both electrical and thermal requirements.