Monolithic Power Systems Inc. MPQ2483ADQ-LF-P

Overview

MPQ2483ADQ-LF-P from Monolithic Power Systems is an AEC-Q100-qualified, industrial-grade 55V, 2.5A peak-current LED driver supporting buck and inverting buck-boost topologies. It integrates a 0.28Ω internal MOSFET, 0.198V current-sense reference, and combined EN/DIM pin for analog and PWM dimming - deployed in automotive headlamps and LCD backlight systems requiring wide-input (4.5–55V), high-reliability constant-current regulation.

For engineers reviewing the MPQ2483ADQ-LF-P datasheet, MPQ2483ADQ-LF-P pinout, MPQ2483ADQ-LF-P application, or MPQ2483ADQ-LF-P equivalent, this page delivers verified package mapping (QFN-10, 3mm×3mm), confirmed pin functions including BST, OVP, and INGND isolation, thermal shutdown at 150°C, and real-world dimming thresholds (0.7–1.4V for 0–100% LED current).

Technical Context

The MPQ2483ADQ-LF-P operates in current-mode control with cycle-by-cycle peak current limiting and slope compensation to ensure stable loop dynamics across input voltages from 4.5V to 55V. Its integrated 0.28Ω MOSFET enables high-efficiency operation up to 2.5A peak current while maintaining <100ns minimum on-time for low-duty applications.

Dimming is implemented via a single EN/DIM pin accepting both DC voltage (0.7–1.4V) and 100Hz–2kHz PWM signals, referenced to INGND - enabling isolated positive-to-negative power conversion. Open-string protection triggers at 1.2V OVP threshold, while foldback frequency drops to 250kHz under short-circuit conditions to limit power dissipation.

Key Specifications

Pinout & Package

MPQ2483ADQ-LF-P is housed in a thermally enhanced 10-pin QFN package (3mm × 3mm, 0.5mm pitch) with exposed VSS pad for low-θ_JA (50°C/W) and robust thermal performance in space-constrained LED modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ2483ADS-LF-Z, the MPQ2483ADQ-LF-P offers superior thermal performance and smaller footprint; versus MPQ4425AGQ-AEC1-Z, it trades peak current for dimming versatility and programmable frequency - critical for EMI-sensitive backlight designs.

Availability

MPQ2483ADQ-LF-P is available at Aetrix Electronics and suitable for automotive lighting, LCD backlight panels, industrial signage, and railway lighting requiring stable component supply across extended temperature and voltage ranges.

Supply support for MPQ2483ADQ-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 high-reliability LED lighting in automotive and industrial environments, emphasizing AEC-Q100 compliance, wide-input operation, and integrated protection for minimal external component count.

FAQ

What is the purpose of the INGND pin on MPQ2483ADQ-LF-P?

The INGND pin provides an isolated ground reference for the EN/DIM control signal, preventing false triggering caused by ground potential differences in buck-boost or negative-output configurations. It must be connected separately from VSS and tied to the source of the dimming control signal - especially critical in automotive applications where LED strings float relative to chassis ground.

Can MPQ2483ADQ-LF-P drive LEDs in boost-only configuration?

No - the MPQ2483ADQ-LF-P supports buck and inverting buck-boost topologies only. It cannot operate in standard boost (step-up) mode because its internal switch connects between SW and VSS, and the bootstrap circuit requires a path to charge the BST capacitor during off-time - which is not possible when SW is the output node in non-inverting boost.

How does open-string protection work on MPQ2483ADQ-LF-P?

When the LED string opens, FB voltage drops near 0V and OVP voltage rises due to lack of current flow. Once OVP reaches 1.2V (set by external resistor divider), the internal switch shuts off. Recovery occurs only after OVP falls below hysteresis (1.14V), ensuring stable latch-off behavior without oscillation during fault conditions.

What is the minimum recommended R_SET value for stable operation?

The datasheet specifies a recommended R_SET range of 20kΩ to 200kΩ, corresponding to 1.7MHz down to 250kHz. Values below 20kΩ risk instability and excessive gate drive losses; R_SET = open yields default 1.35MHz operation. A 1nF ceramic capacitor must be placed from R_SET to VSS to suppress noise coupling into the oscillator.

Does MPQ2483ADQ-LF-P require external Schottky diodes in all configurations?

Yes - a Schottky diode is mandatory in buck and buck-boost configurations to provide a path for inductor current during switch off-time. The diode must have low forward voltage (<0.5V) and sufficient current rating (>2.5A peak). In buck-boost, it also serves as polarity inversion element - omitting it causes catastrophic failure.

What is the maximum duty cycle limitation and how does it affect design?

The MPQ2483ADQ-LF-P supports up to 90% duty cycle. At input voltages above 35V and high LED string voltages, duty cycle approaches this limit - requiring careful inductor selection to avoid saturation and ensuring minimum on-time (100ns) is met. Exceeding 90% may cause regulation loss or intermittent OVP triggering.

Is the 0.198V feedback reference trimmed across temperature?

Yes - the FB reference voltage is specified as 0.198V with ±2% tolerance over -40°C to +125°C, and typical variation is ±0.5% across temperature per Figure 5 in the datasheet. This tight drift ensures consistent LED current accuracy in automotive and industrial environments without external calibration.