Monolithic Power Systems Inc. MPQ2483ADS-LF-P

Overview

MPQ2483ADS-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 analog/PWM dimming on a single EN/DIM pin, features 0.198V feedback reference, 0.28Ω internal MOSFET, and full protection including OVP, SCP, open-string detection, and thermal shutdown - deployed in automotive headlamps and LCD backlighting.

For engineers reviewing the MPQ2483ADS-LF-P datasheet, MPQ2483ADS-LF-P pinout, MPQ2483ADS-LF-P application, or MPQ2483ADS-LF-P equivalent, key selection criteria include input voltage range (4.5–55V), programmable switching frequency (250kHz–1.7MHz via RSET), dual dimming interface, and SOIC-14 package thermal performance (θJA = 86°C/W).

Technical Context

The MPQ2483ADS-LF-P operates in current-mode control with cycle-by-cycle peak current limiting and slope compensation for stable loop response across wide duty cycles. Its error amplifier regulates LED current by comparing FB voltage against a precise 0.198V reference, while COMP pin supports soft-start and PWM dimming via external capacitor coupling.

It implements dual protection logic: OVP threshold is set externally via resistor divider (0.4–1.2V at OVP pin), and short-circuit detection triggers frequency foldback when OVP < 0.4V and FB < 0.1V. The separate INGND reference enables robust enable/dimming control in negative-output configurations.

Key Specifications

Pinout & Package

MPQ2483ADS-LF-P is housed in a 14-pin SOIC package (3.9mm × 8.7mm) with exposed pad not present; thermal resistance θ_JA = 86°C/W on 4-layer PCB. Pin functions are validated per MPS datasheet Rev. 1.01 (2016).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ2483ADS-LF-P, the QFN variant offers superior thermal performance in minimal footprint, while MPQ4425AGU-AEC1-P trades input voltage headroom and frequency flexibility for integration simplicity and higher base switching frequency.

Availability

MPQ2483ADS-LF-P is available at Aetrix Electronics and suitable for automotive lighting, LCD backlighting, and industrial status indication requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MPQ2483ADS-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 delivers robust, AEC-Q100-qualified LED drivers for harsh-environment applications including automotive exterior lighting and industrial panel illumination, emphasizing wide input range, integrated protection, and topology flexibility.

FAQ

What is the maximum recommended LED string current for MPQ2483ADS-LF-P in continuous operation?

The device supports up to 2A average LED current in buck mode with ≤35% duty cycle; above that, thermal limits in the SOIC-14 package require derating. Peak switch current remains 2.5A, but sustained 2A loads demand careful PCB copper area and airflow management per the 86°C/W θ_JA spec.

Can MPQ2483ADS-LF-P operate in boost-only configuration?

No - the MPQ2483A supports only buck and inverting buck-boost (step-up/down) topologies, not standard boost. Its internal architecture ties the SW node to the inductor and Schottky cathode, and VSS serves as the output reference, making non-inverting boost incompatible without external level-shifting circuitry.

How does open-string protection function without external components?

When the LED string opens, FB voltage drops near 0V. The controller increases duty cycle until the OVP pin voltage (set by external resistor divider) reaches 1.2V, triggering shutdown. Recovery occurs automatically once OVP falls below hysteresis threshold (1.14V), enabling self-resetting fault handling without microcontroller intervention.

Is the EN/DIM pin compatible with 3.3V logic microcontrollers?

Yes - EN/DIM accepts 0–6V input with respect to INGND. A 3.3V GPIO can directly drive analog dimming (0.7–1.4V range) using a resistive divider or PWM dimming (≥1.4V amplitude). No level-shifter is needed, though INGND must be tied to the MCU ground if sharing reference.

What is the minimum recommended RSET resistor value and its impact on stability?

MPS specifies 20kΩ as the lower limit for RSET. Using <20kΩ risks excessive switching frequency (>2MHz), which may degrade efficiency due to increased gate charge loss and reduce loop phase margin. Stability is maintained via COMP capacitor tuning, but frequencies beyond 1.7MHz are not characterized for SOIC-14 thermal performance.

Does MPQ2483ADS-LF-P support synchronous rectification?

No - the device drives an external Schottky diode (D1) and does not provide a second gate drive output. Synchronous rectification would require replacing D1 with an N-channel MOSFET and adding external timing control to avoid shoot-through, which is outside the MPQ2483A's architecture.

How is thermal shutdown behavior implemented during overload conditions?

Thermal shutdown activates at 150°C junction temperature, halting switching and holding EN/DIM inactive until die temperature falls by ≥20°C hysteresis. During shutdown, quiescent current drops to ≤20μA, and the device resumes normal operation automatically without external reset - verified per AEC-Q100 transient thermal stress testing.