Monolithic Power Systems Inc. MPQ2483ADS-AEC1-LF-P

Overview

MPQ2483ADS-AEC1-LF-P from Monolithic Power Systems is an AEC-Q100 qualified 55V, 2.5A peak-current LED driver IC supporting buck and inverting buck-boost topologies. It integrates a 0.28Ω internal MOSFET switch, supports analog/PWM dimming via a single EN/DIM pin, and delivers 0.198V feedback reference with ±1.5% tolerance across –40°C to +125°C. Used in automotive headlamp modules requiring stable current regulation under wide input (4.5–55V) and thermal stress.

For engineers reviewing the MPQ2483ADS-AEC1-LF-P datasheet, MPQ2483ADS-AEC1-LF-P pinout, MPQ2483ADS-AEC1-LF-P application, or MPQ2483ADS-AEC1-LF-P equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification, programmable switching frequency (250 kHz–1.7 MHz), open-string and short-circuit protection, and dual-mode dimming control referenced to INGND rather than VSS.

Technical Context

The MPQ2483ADS-AEC1-LF-P employs current-mode control with slope compensation for stable loop response and fast transient recovery. Its error amplifier regulates LED current by comparing FB voltage against a trimmed 0.198V reference, while the COMP pin provides access to the EA output for soft-start and PWM dimming filtering.

Operation includes foldback frequency reduction during output short-circuit (OVP < 0.4V + FB < 0.1V), thermal shutdown at 150°C, and cycle-by-cycle over-current protection triggered at 3.0A peak current. The RSET pin enables precise oscillator frequency setting via external resistor, with default 1.35MHz operation when left open.

Key Specifications

Pinout & Package

MPQ2483ADS-AEC1-LF-P uses a 14-pin SOIC package (3.9mm × 8.7mm) with exposed pad connected to VSS. Pin 1 is marked with index area; leads are gull-wing, RoHS-compliant, and rated for 260°C reflow.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ2483ADS-AEC1-LF-P, the QFN variant offers superior thermal dissipation for continuous 2.5A operation, while the MPQ4425AGU-AEC1-P trades configurability for integration and higher switching frequency-making it suitable for lower-input-voltage, space-sensitive designs where OVP programmability is less critical.

Availability

MPQ2483ADS-AEC1-LF-P is available at Aetrix Electronics and suitable for automotive lighting, industrial machine vision systems, and commercial signage requiring stable component supply with AEC-Q100 assurance and long-term production continuity.

Supply support for MPQ2483ADS-AEC1-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 MPQ2483A product line targets automotive-grade LED lighting applications requiring robustness across wide input ranges, high ambient temperatures, and stringent safety standards-emphasizing integrated protection and simplified system design.

FAQ

What is the maximum recommended LED string voltage for MPQ2483ADS-AEC1-LF-P in buck-boost mode?

The device supports up to 55V output in inverting buck-boost configuration, limited by the 60V absolute maximum V_SW–V_SS rating. For sustained reliability, keep peak string voltage ≤50V at 125°C junction temperature, accounting for OVP hysteresis and transient overshoot.

Can MPQ2483ADS-AEC1-LF-P drive multiple parallel LED strings without external current balancing?

No. The IC regulates total output current only. Driving parallel strings requires matched forward voltages or external per-string current regulation (e.g., linear current sinks or additional drivers) to prevent thermal runaway and uneven brightness.

How does the INGND pin improve dimming reliability in buck-boost applications?

INGND provides a dedicated reference for the EN/DIM signal independent of VSS, which floats in buck-boost topologies. This prevents false turn-off or erratic dimming caused by VSS voltage spikes during switching transitions-ensuring consistent analog and PWM control across all operating modes.

What is the minimum RSET resistor value for stable operation, and why is a bypass capacitor required?

The minimum recommended RSET is 20kΩ (yielding ~1.7MHz). A 1nF capacitor to VSS is mandatory to suppress high-frequency noise coupling into the oscillator circuit, preventing jitter, frequency drift, or unintended frequency shifts during load transients.

Does MPQ2483ADS-AEC1-LF-P support daisy-chained PWM dimming across multiple ICs?

No. Each IC requires its own PWM signal applied directly to its EN/DIM pin. Synchronizing multiple units requires a common clock source driving individual EN/DIM inputs through level-shifted buffers, as the device lacks master/slave sync capability or spread-spectrum modulation control.

How does open-string protection behave when only one LED fails in a multi-string configuration?

Open-string protection activates only if the entire sensed current path opens-i.e., all strings disconnect from FB. If one string fails open while others remain intact, the IC continues regulating total current, causing surviving strings to draw higher current unless external per-string sensing is implemented.

Is the 0.198V feedback reference trimmed at production, and what is its drift over temperature?

Yes-the reference is laser-trimmed during wafer sort. Electrical characteristics specify ±1.5% variation over –40°C to +125°C, with typical drift of ±0.5% across that range, ensuring stable LED current accuracy without external calibration.