Monolithic Power Systems Inc. MPQ2483DQ-LF-P

Overview

MPQ2483DQ-LF-P from Monolithic Power Systems is a 55V, 2.5A peak-current industrial/automotive-grade LED driver IC supporting buck and inverting buck-boost topologies, featuring 0.198V feedback reference, 0.28Ω internal MOSFET, programmable switching frequency (250kHz–1.35MHz), and AEC-Q100 qualification for automotive lighting systems.

For engineers reviewing the MPQ2483DQ-LF-P datasheet, MPQ2483DQ-LF-P pinout, MPQ2483DQ-LF-P application, or MPQ2483DQ-LF-P equivalent, key selection criteria include input voltage range (4.5–55V), dual dimming capability (DC/PWM on EN/DIM), open-string and short-circuit protection, thermal shutdown, and QFN-10(3×3mm) package compatibility with high-power LED drivers in constrained layouts.

Technical Context

The MPQ2483DQ-LF-P implements current-mode control with cycle-by-cycle peak current limiting and slope compensation to ensure stable operation across wide duty cycles (up to 90%) and input ranges. Its error amplifier integrates FB voltage deviation from 0.198V to regulate LED current via external sense resistor.

It supports dual topology operation: step-down (buck) and inverting step-up/down (buck-boost), enabled by separate INGND reference and floating BST supply. Protection logic monitors OVP pin voltage (1.2V threshold), FB voltage (<0.1V), and thermal junction (150°C shutdown) to trigger foldback or disable SW.

Key Specifications

Pinout & Package

MPQ2483DQ-LF-P is housed in a thermally enhanced 10-pin QFN package (3mm × 3mm, 0.5mm pitch) with exposed thermal pad connected to VSS. The package supports high-power density layout and meets AEC-Q100 Grade 1 requirements (−40°C to +125°C T_J).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ2483DQ-LF-P, MPQ2489DQ-LF-P delivers higher current headroom and EMI mitigation but at increased cost and thermal load, while LM3409QMYX/NOPB sacrifices integration and automotive qualification for basic buck functionality in non-critical environments.

Availability

MPQ2483DQ-LF-P is available at Aetrix Electronics and suitable for automotive lighting, LCD backlighting, industrial machine vision, and commercial signage requiring stable component supply, AEC-Q100 compliance, and high-reliability LED current regulation.

Supply support for MPQ2483DQ-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 MPQ2483 belongs to MPS's automotive-grade LED driver product line, engineered specifically for robust, high-efficiency constant-current regulation in harsh environments where reliability, thermal resilience, and functional safety are critical.

FAQ

What is the maximum recommended LED string voltage for MPQ2483DQ-LF-P in buck-boost mode?

In buck-boost (inverting) configuration, the maximum output voltage is limited by the 55V VDD rating and internal switch breakdown. With proper external components (e.g., 60V Schottky diode, 63V output capacitor), the IC supports LED string voltages up to 50V while maintaining margin for transients and ripple. Exceeding 50V risks OVP false triggering or reduced reliability under load step events.

Can MPQ2483DQ-LF-P operate without the RSET resistor?

Yes - leaving RSET open configures the default switching frequency to 1.35MHz (typical), verified across temperature and input voltage. This simplifies prototyping but may increase EMI; for optimized efficiency or noise performance, a 20kΩ–200kΩ resistor is recommended to set 250kHz–1.35MHz as needed.

How does the INGND pin improve noise immunity in buck-boost applications?

INGND provides a dedicated reference for the EN/DIM control signal, isolating it from high-di/dt VSS return currents. In buck-boost topologies where VSS carries both input and output return paths, this separation prevents false dimming commands or erratic enable behavior caused by ground bounce on the control pin.

What is the minimum inductor value recommended for stable operation at 2.5A output?

For 2.5A peak current in buck mode, MPS recommends ≥1µH inductance with ≥3.1A saturation current and ≤200mΩ DCR. At 1.35MHz default frequency, a 2.2µH/3.5A shielded inductor (e.g., TDK SLF7055T-2R2N3R5) ensures <30% ripple current and avoids subharmonic oscillation.

Does MPQ2483DQ-LF-P support true 0–100% PWM dimming linearity?

Yes - tested data shows linear LED current response from 0% to 100% dimming duty cycle when using 100Hz–2kHz square-wave signals with >1.4V amplitude referenced to INGND. Linearity deviation is <±3% across temperature (−40°C to +125°C) due to internal current-mode regulation and fast COMP loop response.

Is the exposed thermal pad on the QFN-10 package electrically connected?

Yes - the exposed pad is internally bonded to VSS and must be soldered to a solid copper thermal pad on the PCB, connected directly to the main ground plane. Thermal resistance drops from θ_JA = 50°C/W to <35°C/W with ≥4 thermal vias (0.3mm diameter) under the pad, critical for sustaining 2.5A continuous operation at +125°C ambient.

What happens during an open-LED fault condition?

When the LED string opens, FB voltage drops near 0V. The controller increases duty cycle until OVP pin voltage reaches 1.2V (set by external divider), then disables SW and enters hiccup mode. Recovery occurs automatically once OVP voltage falls below 1.14V (60mV hysteresis), preventing latch-up and enabling self-recovery after fault removal.