Monolithic Power Systems Inc. MP2480DN-LF

Overview

MP2480DN-LF from Monolithic Power Systems is a constant-current step-down LED driver IC with integrated 4.3A high-side MOSFET, delivering up to 3A LED current across 5V–36V input range, ±3% current accuracy, and 2MHz switching frequency-designed for high-power LED lighting and LCD backlighting systems.

For engineers reviewing the MP2480DN-LF datasheet, MP2480DN-LF pinout, MP2480DN-LF application, or MP2480DN-LF equivalent, key selection criteria include hysteretic current-mode control architecture, 200mV FB reference with adaptive thresholds, thermal shutdown and short-circuit protection, SOIC8-EP package with exposed thermal pad, and compatibility with PWM dimming up to 20kHz.

Technical Context

The MP2480DN-LF implements hysteretic current-mode control with dual adaptive FB thresholds (225mV upper / 175mV lower), eliminating external compensation and enabling fast transient response. Its internal bootstrap regulator supplies ~5V to the floating high-side gate driver, supporting operation down to 5V input while maintaining >95% efficiency at full load.

LED current regulation relies on sensing voltage across an external resistor connected to the FB pin, referenced to a stable 200mV average. Protection features include UVLO (4.0V rising / 3.6V falling), thermal shutdown (150°C trip with 20°C hysteresis), and cycle-by-cycle current limiting at 4.3A peak.

Key Specifications

Pinout & Package

The MP2480DN-LF is housed in an SOIC8-EP package with an exposed thermal pad on the bottom, requiring connection to PCB ground plane via thermal vias for optimal junction-to-ambient thermal resistance (θJA = 50°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar constant-current LED driver applications.

Compared with LM3409HVMM/NOPB and LT3476EFE#PBF, the MP2480DN-LF offers lowest component count and smallest footprint for single-string 3A applications, trading off multi-channel capability and ultra-high VIN tolerance for simplicity, thermal performance, and guaranteed ±3% current accuracy without trimming.

Availability

MP2480DN-LF is available at Aetrix Electronics and suitable for architectural LED lighting, automotive cabin lighting, and LCD TV backlighting requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP2480DN-LF 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 design centers in the US, China, and Taiwan.

The MP2480 belongs to MPS's high-power LED driver product line, engineered specifically for efficient, thermally robust constant-current regulation in space-constrained lighting systems operating from wide-input industrial and automotive rails.

FAQ

What is the minimum input voltage required for reliable startup?

The MP2480DN-LF features under-voltage lockout with a rising threshold of 4.0V and hysteresis of 0.4V. Reliable startup occurs only when VIN exceeds 4.0V; operation below 3.6V disables the device entirely. This ensures stable bootstrap capacitor charging and gate drive before enabling the high-side switch.

Can the MP2480DN-LF drive LEDs directly without an external rectifier diode?

No. The MP2480DN-LF is a high-side buck controller requiring an external Schottky rectifier connected between the SW pin and LED cathode. The IC does not integrate a synchronous rectifier; omitting the diode will prevent proper current path completion and cause immediate failure.

How is LED current accuracy affected by temperature?

LED current accuracy remains within ±3% over the full operating temperature range of –40°C to +85°C. This is achieved via adaptive FB threshold adjustment that compensates for comparator offset drift and RDS(ON) variation, as confirmed by characterization data showing <0.5% deviation in average FB voltage from 200mV across temperature.

Is the NC pin (Pin 6) safe to connect to ground or leave floating?

Pin 6 is internally unconnected and must remain unpopulated on the PCB. Connecting it to ground or any other net may cause unpredictable behavior due to potential coupling into sensitive analog circuitry. The datasheet explicitly states "Not connected" and shows no internal bond wire to this pad.

What is the recommended layout practice for the exposed thermal pad?

The exposed pad must be soldered to a dedicated PCB ground plane using a grid of ≥9 thermal vias (15mil diameter, 40mil pitch), filled during plating. These vias should connect directly to an inner-layer GND plane-not a signal layer-to achieve θJC ≈ 10°C/W and prevent junction temperature exceedance at 3A load.

Does the MP2480DN-LF support analog dimming in addition to PWM?

No. The MP2480DN-LF supports only PWM dimming via the DIM pin (0.8–1.5V logic threshold). Analog dimming-by varying FB reference or sense voltage-is not supported; altering FB voltage disrupts hysteretic regulation and risks instability or overcurrent.

What failure modes trigger automatic recovery versus latch-off protection?

The MP2480DN-LF uses auto-recovery for thermal shutdown (resumes after die cools 20°C below trip point) and short-circuit events (retries every ~300µs). It does not latch off-no external reset is needed. UVLO and EN disable are also non-latching; operation resumes immediately upon valid input conditions.