Monolithic Power Systems Inc. MPQ2483DQ-AEC1-LF-Z

Overview

MPQ2483DQ-AEC1-LF-Z 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, delivers 0.198V reference voltage for precise current regulation, and supports both analog (0.7–1.4V EN/DIM) and PWM dimming (100Hz–2kHz). Used in automotive headlamps and LCD backlighting where wide input range (4.5–55V) and fault protection are critical.

For engineers reviewing the MPQ2483DQ-AEC1-LF-Z datasheet, MPQ2483DQ-AEC1-LF-Z pinout, MPQ2483DQ-AEC1-LF-Z application, or MPQ2483DQ-AEC1-LF-Z equivalent, this page provides verified technical context, validated pin functions, real-world dimming behavior, thermal shutdown thresholds (150°C), and AEC-Q100-compliant package-level reliability data - all confirmed against Monolithic Power's Rev. 1.05 datasheet.

Technical Context

The MPQ2483DQ-AEC1-LF-Z operates in current-mode control with cycle-by-cycle peak current limiting and slope compensation to ensure stable operation across duty cycles up to 90%. Its error amplifier integrates feedback from the 0.198V FB pin to regulate LED current via external sense resistor, while COMP pin output drives loop compensation with ≥1nF capacitor.

It implements dual dimming on EN/DIM: analog dimming maps 0.7–1.4V (w.r.t. INGND) linearly to 0–100% LED current, and PWM dimming accepts 1.4V-min amplitude signals at 100Hz–2kHz. Fault handling includes fold-back frequency reduction during short-circuit (OVP < 0.4V + FB < 0.1V), open-string detection (OVP threshold 1.2V), and thermal shutdown at 150°C.

Key Specifications

Pinout & Package

MPQ2483DQ-AEC1-LF-Z uses a 10-pin 3mm × 3mm QFN package with exposed thermal pad connected to VSS. Pin 1 ID is marked by a dot; pin numbering follows standard QFN counterclockwise layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ2483DQ-AEC1-LF-Z, MPQ2489DQ-AEC1-LF-Z offers higher current capability in identical footprint, while LT3476EFE#TRPBF trades integration for channel flexibility - neither matches the combination of AEC-Q100 qualification, 2.5A single-channel drive, and dual-mode dimming in QFN-10.

Availability

MPQ2483DQ-AEC1-LF-Z is available at Aetrix Electronics and suitable for automotive lighting, LCD backlighting, and industrial panel indicator applications requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.

Supply support for MPQ2483DQ-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 in the US, China, and Taiwan.

The MPQ2483 belongs to MPS's automotive-grade LED driver product line, engineered specifically for robust operation in harsh environments including engine compartments and exterior lighting modules.

FAQ

What is the maximum allowable LED string voltage when using MPQ2483DQ-AEC1-LF-Z in buck-boost mode?

The maximum LED string voltage is constrained by the 55V VDD–VSS rating and OVP pin threshold. With OVP set to 1.2V via external divider, output voltage can reach up to ~53V before triggering shutdown. In practice, derate to ≤48V for margin against transients and thermal rise, especially at high ambient temperatures.

Can MPQ2483DQ-AEC1-LF-Z operate without the RSET resistor?

Yes - leaving RSET open configures the default oscillator frequency at 1.35MHz (typical), enabling use with minimal external components. However, adding a 20kΩ–200kΩ resistor allows tuning between 250kHz and 1.35MHz to optimize efficiency, EMI, or inductor size for the specific application.

How does the INGND pin improve dimming performance in buck-boost topology?

INGND provides a dedicated reference for the EN/DIM pin, decoupling dimming control from noisy power ground paths. In buck-boost configurations where VSS carries high di/dt switching currents, referencing EN/DIM to INGND prevents false triggering and ensures accurate analog dimming linearity across temperature and load conditions.

Is the 0.198V FB reference voltage affected by temperature?

Yes - the FB reference exhibits ±10mV drift from −40°C to +125°C (0.188V to 0.208V), as shown in Figure 6 of the datasheet. This 5% variation directly impacts LED current accuracy; for precision applications, select sense resistor tolerance ≤1% and consider thermal layout to minimize local die temperature gradients.

What happens during an open-LED fault, and how is recovery handled?

When the LED string opens, FB voltage drops near 0V, causing the controller to increase duty cycle until OVP pin voltage reaches 1.2V. At that point, the switch shuts off. Recovery occurs automatically once OVP voltage falls below 1.14V (60mV hysteresis), restoring normal regulation without requiring reset or external intervention.

Does MPQ2483DQ-AEC1-LF-Z support synchronization to an external clock?

No - the MPQ2483DQ-AEC1-LF-Z lacks an external sync input. Its oscillator is internally generated and programmable only via RSET resistor value or open-circuit default. For synchronized multi-phase LED drivers, consider MPS's MPQ4470 or alternative families with SYNC pin capability.

What is the minimum recommended input capacitance, and why is low ESR critical?

A 4.7µF X5R/X7R ceramic capacitor is minimum; low ESR (<50mΩ) is critical to suppress high-frequency switching noise injected into the input rail and prevent voltage spikes at VDD during peak current transitions, which could trigger UVLO or degrade long-term reliability.