Monolithic Power Systems Inc. MPQ2483ADQ-AEC1-LF-Z

Overview

MPQ2483ADQ-AEC1-LF-Z from Monolithic Power Systems is an AEC-Q100 qualified 55V, 2.5A peak-current LED driver supporting buck and inverting buck-boost topologies with integrated 0.28Ω MOSFET, 0.198V feedback reference, and combined EN/DIM analog+PWM dimming control. It delivers stable current regulation for automotive lighting systems operating across 4.5V–55V input range.

For engineers reviewing the MPQ2483ADQ-AEC1-LF-Z datasheet, MPQ2483ADQ-AEC1-LF-Z pinout, MPQ2483ADQ-AEC1-LF-Z application, or MPQ2483ADQ-AEC1-LF-Z equivalent, this device enables high-reliability LED current control in thermally constrained automotive environments with programmable switching frequency, open-string protection, and thermal shutdown - critical for headlamp and DRL designs requiring functional safety compliance.

Technical Context

The MPQ2483ADQ-AEC1-LF-Z implements current-mode control with slope compensation to ensure stability across wide duty cycles and input ranges. Its error amplifier regulates LED current via a 0.198V reference at FB, while COMP provides loop compensation and soft-start capability through external capacitor filtering.

It integrates dual-function EN/DIM pin for seamless transition between analog dimming (0.7V–1.4V linear control) and PWM dimming (100Hz–2kHz), with dedicated INGND reference to decouple dimming signals from power ground noise. The RSET pin sets oscillator frequency from 250kHz to 1.7MHz using external resistor, enabling EMI optimization in vehicle cabin and exterior lighting layouts.

Key Specifications

Pinout & Package

MPQ2483ADQ-AEC1-LF-Z is housed in a thermally enhanced 10-pin QFN package (3mm × 3mm, 0.5mm pitch) with exposed VSS pad for low-thermal-resistance PCB mounting. The package meets AEC-Q100 Grade 1 requirements (−40°C to +125°C junction).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ2483ADS-AEC1-LF-Z, the QFN variant offers 39% lower thermal resistance for sustained 2.5A operation in confined spaces; versus MPQ4425AGU-AEC1-P, it provides wider input range, topology flexibility, and analog dimming - essential for robust automotive exterior lighting.

Availability

MPQ2483ADQ-AEC1-LF-Z is available at Aetrix Electronics and suitable for automotive lighting, industrial machine vision, and off-road equipment requiring stable component supply with AEC-Q100 assurance and long-term production continuity.

Supply support for MPQ2483ADQ-AEC1-LF-Z 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 across Asia and North America and global manufacturing partnerships.

The MPQ2483A product line targets automotive-grade LED lighting applications, delivering integrated, thermally robust current regulators that simplify system design while meeting stringent reliability and safety requirements.

FAQ

What is the maximum recommended LED string voltage for MPQ2483ADQ-AEC1-LF-Z in buck-boost mode?

The device supports output voltages up to 55V minus forward drop of external Schottky diode and inductor DCR losses. With typical 0.4V diode drop and 0.1Ω inductor, maximum sustainable LED string voltage is ~54.5V. This enables driving up to seven 3W white LEDs (3.2V each) in series under worst-case conditions.

Can MPQ2483ADQ-AEC1-LF-Z operate with a 3.3V microcontroller GPIO controlling EN/DIM?

Yes - the EN/DIM pin has a 0.6V turn-on threshold and accepts logic-high signals ≥1.4V for full LED current. A 3.3V GPIO meets both requirements and remains within absolute max rating (≤6V). For analog dimming, use a DAC or resistor divider to scale 3.3V to 0.7–1.4V range.

How does the OVP protection interact with open-string detection?

OVP protection triggers when voltage at OVP pin exceeds 1.2V, turning off the switch. During open-string failure, FB drops near 0V and OVP rises due to lack of current flow, eventually reaching 1.2V. The chip then shuts down and recovers only after OVP falls below hysteresis threshold (~1.14V), ensuring latch-free fault response.

Is RSET required for basic operation, or can it be left floating?

RSET can be left open to use the default 1.35MHz switching frequency. However, leaving it floating may increase susceptibility to noise coupling. MPS recommends connecting a 1nF capacitor from RSET to VSS for noise immunity even when no resistor is installed.

Does the 0.28Ω internal MOSFET support continuous 2.5A current at 125°C junction temperature?

No - at T_J = 125°C, thermal derating reduces maximum sustainable current to ~2.0A in QFN-10 package due to power dissipation limits (P_D = I² × R_DS(on)). Full 2.5A peak is specified at T_J ≤ 85°C with proper PCB copper area and airflow.

What is the purpose of the separate INGND pin, and can it be tied to VSS?

INGND provides isolated reference for EN/DIM signals to reject ground bounce from high-current switching paths. While tying INGND to VSS is electrically functional, it risks dimming instability during heavy load transients; MPS recommends separate low-impedance routing to main system ground plane.

How does the device handle input voltage transients exceeding 55V, such as ISO 7637-2 Pulse 5a?

The absolute maximum VDD–VSS rating is 60V at T_J ≥ 0°C. While brief 60V transients are tolerated, sustained exposure above 55V violates recommended operating conditions. External TVS clamping (e.g., SMAJ58A) is advised for full ISO 7637-2 compliance in automotive harnesses.