Monolithic Power Systems Inc. MP2482DN-LF-P

Overview

MP2482DN-LF-P from Monolithic Power Systems is a monolithic synchronous step-down DC/DC converter with integrated 50mΩ high-side MOSFET, delivering 5A continuous output current across 4.5V–30V input range. It operates at fixed 420kHz switching frequency, supports external synchronization up to 1.5MHz, and features power-good indication, cycle-by-cycle overcurrent protection with hiccup mode, and thermal shutdown - deployed in flat-panel TV power rails and broadband communication front-end supplies.

For engineers reviewing the MP2482DN-LF-P datasheet, MP2482DN-LF-P pinout, MP2482DN-LF-P application, or MP2482DN-LF-P equivalent, key selection criteria include its SOIC8E thermally enhanced package, 0.808V feedback reference voltage, 100ns minimum on-time, UVLO thresholds (4.1V rising / 3.2V falling), and compatibility with low-ESR ceramic output capacitors for stable 3.3V/5A regulation.

Technical Context

The MP2482DN-LF-P implements peak-current-mode control with a fixed 420kHz internal oscillator, enabling fast transient response and simplified loop compensation. Its error amplifier compares FB voltage against a trimmed 0.808V internal reference and drives a COMP node that sets MOSFET conduction time per cycle.

It integrates a floating high-side gate driver powered by an external bootstrap capacitor between SW and BST pins, with internal BST UVLO (2.2V rising threshold). The EN/SYNC pin serves dual function: logic-level enable control and external clock synchronization from 300kHz to 1.5MHz via rising-edge alignment.

Key Specifications

Pinout & Package

MP2482DN-LF-P is housed in an 8-pin SOIC package with exposed thermal pad (SOIC8E), optimized for high-power density and thermal dissipation in compact PCB layouts. The exposed pad must be soldered to a dedicated copper pour for effective heat transfer.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2482DN-LF-P, MP2482DS-LF-Z trades thermal performance for cost-sensitive non-thermal-limited applications, while MPQ2482DN-LF-Z adds automotive qualification without altering electrical behavior - making the original ideal for industrial and consumer high-current buck conversion where thermal management is prioritized.

Availability

MP2482DN-LF-P is available at Aetrix Electronics and suitable for flat panel television power supplies, broadband gateway PoE PD stages, and industrial video encoder modules requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.

Supply support for MP2482DN-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 design centers in the US, China, and Taiwan.

The MP2482 belongs to MPS's high-current monolithic buck converter product line, engineered for compact, efficient, and thermally robust DC/DC conversion in consumer, industrial, and communications equipment.

FAQ

What is the minimum recommended output capacitor value for MP2482DN-LF-P?

The datasheet specifies a minimum 22µF X5R/X7R ceramic capacitor for 5A output applications. This value ensures adequate ripple suppression (<20mV_pp) and loop stability with the internal compensation network. Using lower capacitance risks instability or excessive output voltage deviation under transient load steps.

Can MP2482DN-LF-P operate with a 3.3V input supply?

No - the absolute minimum input voltage is 4.5V per the datasheet's Recommended Operating Conditions. At 3.3V, the internal UVLO circuit prevents startup, and the VCC regulator cannot sustain bias for control logic. For sub-4.5V inputs, consider the MP2315 or MP2307 families.

Is an external bootstrap diode required for normal operation?

No - the internal bootstrap charging circuit suffices for standard duty cycles. An external diode (e.g., IN4148) is optional and only recommended when V_OUT = 3.3V or 5V and duty cycle exceeds 65%, to improve light-load efficiency by reducing BST capacitor discharge losses.

How does the hiccup-mode overcurrent protection behave during a sustained short circuit?

When FB falls below 0.74V due to overload, the device enters hiccup mode: it shuts down for ~10ms, then attempts restart. This cycle repeats, limiting average short-circuit current to ~1.2A and keeping junction temperature below 125°C - preventing damage while allowing automatic recovery once the fault clears.

What is the maximum achievable output voltage accuracy over temperature and line/load conditions?

Over -40°C to +125°C junction temperature, 4.5V–30V input, and 0–5A load, total output voltage error is ±2.5% - dominated by FB reference tolerance (±2.5% over temp), resistor divider drift, and load regulation (±0.5%). Using 0.5% resistors improves accuracy to ±1.5%.

Does MP2482DN-LF-P support forced PWM or discontinuous conduction mode (DCM)?

No - it operates exclusively in peak-current-mode continuous conduction mode (CCM) with fixed-frequency control. There is no DCM or pulse-skipping mode; light-load efficiency relies on reduced quiescent current (0.9mA typ) rather than frequency modulation.

What PCB layout practices are critical for thermal performance in SOIC8E package?

Thermal performance depends on soldering the exposed pad to ≥2cm² of 2oz internal or bottom-layer copper connected via ≥6 thermal vias (0.3mm diameter). Avoid routing high-speed signals under the pad, and keep FB trace short and shielded from SW node to prevent regulation errors.