Monolithic Power Systems Inc. MP2494DS-LF-P

Overview

MP2494DS-LF-P from Monolithic Power Systems is a monolithic 2A, 55V input, 100kHz fixed-frequency step-down DC/DC converter with integrated 0.25Ω high-side MOSFET, adjustable 0.8V–45V output, cycle-by-cycle current limiting, and thermal shutdown-designed for automotive cigarette lighter adapters and USB power supplies.

For engineers reviewing the MP2494DS-LF-P datasheet, MP2494DS-LF-P pinout, MP2494DS-LF-P application, or MP2494DS-LF-P equivalent, key selection criteria include its 4.5–55V wide input range, SOIC8E package thermal performance (θJA = 50°C/W), 100ns minimum on-time capability, and bootstrap-driven synchronous operation requiring external diode for >12V output or >65% duty cycle.

Technical Context

The MP2494DS-LF-P implements peak-current-mode control with internal slope compensation and a 0.8V ±2.5% precision bandgap reference feedback voltage. Its error amplifier integrates the FB-to-reference error to modulate peak inductor current per cycle.

Switching is synchronized to a fixed 100kHz oscillator; the SW node drives an external inductor while BST supplies gate drive above VIN via a floating capacitor. EN enables/disables regulation with 1.8V high-threshold and 0.4V low-threshold logic compatibility.

Key Specifications

Pinout & Package

MP2494DS-LF-P is supplied in the SOIC8E package (JEDEC MS-012 variation BA), offering improved thermal resistance (θJA = 50°C/W, θJC = 10°C/W) versus standard SOIC8.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM5164QDRCRQ1 and TPS54240DGQR, MP2494DS-LF-P offers superior 55V input rating and SOIC8E thermal performance for sustained 2A loads in space-constrained industrial environments, while requiring external bootstrap diode support for high-duty-cycle operation.

Availability

MP2494DS-LF-P is available at Aetrix Electronics and suitable for automotive cigarette lighter adapters, industrial 24V-to-12V conversion, and ruggedized PoE-powered devices requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for MP2494DS-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 power ICs, with core expertise in DC/DC conversion, motor drivers, and LED lighting controllers.

The MP2494 belongs to MPS's industrial-grade buck converter product line, engineered for robust operation in automotive, transportation, and harsh-environment applications where wide input range and thermal resilience are critical.

FAQ

What is the maximum output voltage achievable with MP2494DS-LF-P?

The MP2494DS-LF-P supports adjustable output voltages from 0.8V up to 45V using an external resistor divider on the FB pin. This upper limit is constrained by the absolute maximum voltage rating of the FB pin (6.5V) and the need to maintain stable loop compensation across the full range; outputs above 45V risk violating internal bias constraints and reducing regulation accuracy.

Is an external bootstrap diode required for all applications?

An external bootstrap diode is recommended-not mandatory-for applications with VOUT >12V, VIN/VOUT duty cycle >65%, or fixed 5V input, as stated in the datasheet. It improves gate-drive reliability and efficiency by supplementing the internal bootstrap regulator; omission may cause intermittent dropout under heavy load or elevated temperature.

How does the GS (Ground Sense) pin improve regulation accuracy?

The GS pin provides a dedicated Kelvin connection to the system ground plane, separate from the main GND pin carrying high-switching currents. This eliminates voltage drop errors across PCB trace resistance, ensuring the current-sense amplifier and feedback reference operate from a clean, low-noise ground reference-critical for tight output voltage regulation under dynamic load.

Can MP2494DS-LF-P operate with ceramic output capacitors only?

Yes-the MP2494DS-LF-P is explicitly characterized and stabilized with low-ESR ceramic capacitors (X5R/X7R). Its internal compensation is optimized for ceramic output networks, eliminating the need for aluminum or tantalum electrolytics and improving reliability, temperature stability, and transient response in compact designs.

What is the purpose of the SS (Soft-Start) pin, and how is it implemented?

The SS pin connects to an external capacitor that linearly ramps the internal reference voltage during startup, controlling output voltage rise time and limiting inrush current into output capacitance. A typical 10nF capacitor yields ~1ms soft-start; larger values extend ramp time proportionally, preventing input voltage sag or tripping upstream current limits.

Does MP2494DS-LF-P support synchronization to an external clock?

No-the MP2494DS-LF-P features a fixed 100kHz internal oscillator with no external sync input. Frequency cannot be adjusted or synchronized; designs requiring EMI spread-spectrum or multi-phase coordination must select alternative regulators such as the MPQ4312-A or MPQ4331-A.

What is the thermal performance difference between SOIC8 and SOIC8E packages?

The SOIC8E package has θJA = 50°C/W and θJC = 10°C/W, versus SOIC8's θJA = 90°C/W and θJC = 45°C/W. This 45% lower junction-to-ambient resistance allows the SOIC8E variant (MP2494DS-LF-P) to sustain full 2A output at +85°C ambient without derating, whereas SOIC8 requires significant current reduction above +60°C.