Monolithic Power Systems Inc. MP2483DQ-LF-P

Overview

MP2483DQ-LF-P from Monolithic Power Systems is a 55V, 2.5A white LED driver IC supporting buck, inverting buck-boost, and step-up/down topologies with programmable switching frequency (0.5–3.5 MHz), 0.198V feedback reference, and integrated 0.28Ω MOSFET. It delivers stable current regulation for multi-LED strings in automotive interior lighting and portable display backlighting.

For engineers reviewing the MP2483DQ-LF-P datasheet, MP2483DQ-LF-P pinout, MP2483DQ-LF-P application, or MP2483DQ-LF-P equivalent, key selection criteria include its dual dimming capability (DC/PWM on single EN/DIM pin), open-string and short-circuit protection, thermal shutdown at 150°C, and QFN10 package suitability for space-constrained LED driver designs.

Technical Context

The MP2483DQ-LF-P employs peak current-mode control with slope compensation to ensure loop stability across wide duty cycles and input ranges (4.5V–55V). Its error amplifier integrates FB voltage error against a precise 0.198V reference, directly regulating LED current via external sense resistor.

It implements fault management through cycle-by-cycle overcurrent limiting, fold-back frequency reduction during output short circuits (triggered when OVP < 0.4V and FB < 0.1V), and thermal shutdown at 150°C. The RSET pin enables frequency programming from 0.5 MHz to 3.5 MHz using an external resistor, while default operation at 1.35 MHz occurs with RSET left open.

Key Specifications

Pinout & Package

MP2483DQ-LF-P is housed in a thermally enhanced 10-pin 3mm × 3mm QFN package with exposed VSS pad for improved heat dissipation. Pin 1 is marked by a dot; pins are numbered counterclockwise starting from top-left corner.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar white LED driver applications.

Compared with MP2483DQ-LF-P, the MPQ2483DQ-LF-Z adds automotive qualification at higher cost and longer lead time, while the LT3466-1EDD#TRPBF sacrifices programmability and dual-dimming for simpler layout and mature supply chain - making MP2483DQ-LF-P optimal for cost-sensitive, flexible-design industrial and consumer LED systems.

Availability

MP2483DQ-LF-P is available at Aetrix Electronics and suitable for automotive interior lighting, LCD backlight panels, handheld computers, and portable GPS devices requiring stable component supply, RoHS-compliant packaging, and full traceability.

Supply support for MP2483DQ-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, and global manufacturing partnerships.

The MP2483 belongs to MPS's white LED driver product line, engineered specifically for high-current, wide-input-voltage LED illumination in automotive, industrial, and portable applications where reliability, thermal efficiency, and topology flexibility are critical.

FAQ

What is the maximum recommended LED string voltage for MP2483DQ-LF-P in buck-boost mode?

In buck-boost (inverting) configuration, the absolute maximum output voltage is limited by the 60V absolute maximum rating of the SW-to-VSS node. With 55V VDD and proper OVP divider setting, the practical maximum LED string voltage is 52V to maintain 3V headroom for safe operation and transient margin. Exceeding this risks OVP latch-up or switch breakdown.

Can MP2483DQ-LF-P drive LEDs without an external Schottky diode in buck mode?

No. The MP2483DQ-LF-P requires an external Schottky rectifier (e.g., SS34 or equivalent) connected between SW and the LED cathode in buck topology. Its internal MOSFET is a single N-channel switch; no synchronous rectification or integrated body diode is provided for freewheeling path completion.

How does the OVP pin function during open-LED conditions?

During open-LED fault, FB voltage drops near 0V, causing the controller to increase duty cycle until the OVP pin voltage (set by external resistor divider) reaches 1.2V. At that point, the internal switch turns off and remains latched until OVP voltage falls below hysteresis threshold (~1.14V), enabling automatic recovery after fault removal.

What is the minimum recommended R_SET value for stable 3.5MHz operation?

A 20kΩ resistor from RSET to VSS yields ~3.5MHz per the frequency curve in the datasheet. Use a 1% metal-film resistor and place a 1nF X7R ceramic capacitor directly from RSET to VSS to suppress noise coupling - values outside 20kΩ–150kΩ may cause instability or undefined frequency behavior.

Does MP2483DQ-LF-P support true 0–100% analog dimming linearly?

Yes. With EN/DIM voltage swept from 0.7V to 1.4V (referenced to INGND), LED current scales linearly from 0% to 100% of full-scale 2.5A. This is verified in the "WLED Current vs VEN" plot (Rev. 1.1, p.5), showing monotonic response with <±3% deviation across temperature.

Is the exposed thermal pad on the QFN10 package electrically connected?

Yes. The exposed pad is internally bonded to VSS (Pin 2) and must be soldered to a dedicated PCB copper pour tied to the main VSS net. Thermal performance degrades significantly - up to 30°C junction rise - if the pad is left floating or connected only through thermal vias without solid copper attachment.

What happens during output short-circuit in buck-boost mode?

When the LED+ node shorts to VSS, OVP voltage drops below 0.4V and FB falls below 0.1V. The IC detects this as short-circuit condition and folds back switching frequency to 250kHz to limit power dissipation. Recovery occurs automatically once the short is removed and OVP/FB voltages return to valid range.