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

Overview

MPQ2483ADQ-AEC1-LF-P 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 current-sense reference, and combined EN/DIM analog+PWM dimming control. It delivers stable LED current regulation for automotive headlamps and interior lighting under 4.5–55V input.

For engineers reviewing the MPQ2483ADQ-AEC1-LF-P datasheet, MPQ2483ADQ-AEC1-LF-P pinout, MPQ2483ADQ-AEC1-LF-P application, or MPQ2483ADQ-AEC1-LF-P equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification, programmable switching frequency (250kHz–1.7MHz), open-string and short-circuit protection, thermal shutdown, and QFN-10 (3mm×3mm) package with exposed VSS pad.

Technical Context

The MPQ2483ADQ-AEC1-LF-P operates in current-mode control with cycle-by-cycle peak current limiting and slope compensation to ensure stability across wide duty cycles. Its error amplifier regulates LED current via a 0.198V FB reference, while COMP pin supports soft-start and PWM dimming through external capacitor coupling.

It implements dual-path protection: OVP threshold set by external resistor divider (1.2V trip), and foldback frequency activation (<0.4V OVP + <0.1V FB) for short-circuit detection. The EN/DIM pin accepts 0.7–1.4V analog dimming or 100Hz–2kHz PWM signals >1.4V, referenced to INGND - enabling isolated negative-output configurations.

Key Specifications

Pinout & Package

MPQ2483ADQ-AEC1-LF-P uses a thermally enhanced 10-pin QFN package (3mm × 3mm, 0.5mm pitch) with exposed VSS pad for low-thermal-resistance PCB mounting. Pin 1 is marked by index area; pins 1, 7, 8 are NC.

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 MPQ2483ADQ-AEC1-LF-P offers superior thermal performance and smaller footprint for production automotive modules; versus MPQ4425AGU-AEC1-P, it trades peak current for design flexibility in frequency tuning, dimming architecture, and negative-output compatibility.

Availability

MPQ2483ADQ-AEC1-LF-P is available at Aetrix Electronics and suitable for automotive lighting, LCD backlighting, and commercial vehicle signage requiring stable component supply with AEC-Q100 traceability and long-term lifecycle support.

Supply support for MPQ2483ADQ-AEC1-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 core expertise in DC/DC conversion, LED drivers, and motor control solutions.

The MPQ2483A product line targets automotive-grade LED lighting applications, designed to replace discrete MOSFET+controller solutions with integrated, fault-protected, and thermally optimized drivers meeting stringent AEC-Q100 reliability requirements.

FAQ

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

The device supports output voltages up to 55V minus diode drop and inductor DCR losses. In buck-boost configuration, maximum LED string voltage is limited by the OVP threshold (programmable up to 1.2V × (R3+R4)/R4) and internal 60V absolute max rating on VSW–VSS. For reliable operation, keep total string voltage ≤50V with 20% margin.

Can MPQ2483ADQ-AEC1-LF-P drive LEDs in a negative-ground configuration?

Yes - the separate INGND pin allows EN/DIM control referenced to input ground while VSS serves as the LED return path. This enables true negative-output buck-boost operation where LED− connects to VSS and LED+ connects to the output capacitor positive terminal, isolating control logic from high-side sensing.

How does the open-string protection mechanism work?

When an LED string opens, FB voltage drops near 0V. The controller increases duty cycle until OVP voltage reaches 1.2V, triggering shutdown. Recovery occurs only after OVP voltage falls below hysteresis (1.14V). This prevents repeated switching attempts and protects the MOSFET from overstress during sustained open-circuit conditions.

What is the minimum RSET resistor value to achieve stable 500kHz operation?

Per the frequency vs. RSET curve, 500kHz corresponds to ~124kΩ. Using a 121kΩ ±1% resistor achieves 505kHz typical operation. Values below 100kΩ risk instability due to reduced phase margin; always pair RSET with a 1nF ceramic bypass capacitor to VSS to suppress noise-induced frequency jitter.

Does MPQ2483ADQ-AEC1-LF-P support synchronous rectification?

No - the device drives an external Schottky diode (D1) connected between SW and LED+/output. It does not integrate or control a synchronous MOSFET. The BST pin supplies gate drive for its internal high-side switch only; no dedicated SR control signals or timing logic are provided.

What PCB layout practices prevent false triggering of OVP or FB protection?

Route OVP and FB traces away from SW node and high-current paths; use guard rings tied to VSS around both pins; place OVP divider resistors close to the IC; add 10kΩ series resistor and 2.0V Zener from FB to VSS per Figure 4; clamp VSS–INGND spikes with 100Ω + Schottky diode per Figure 3.

Is the 0.198V FB reference trimmed at production?

Yes - the 0.198V reference is laser-trimmed during wafer sort, with guaranteed tolerance of ±0.018V (0.180V to 0.215V) over 4.5–12V input and ±0.022V (0.170V to 0.220V) over 12–55V input, ensuring accurate current regulation without external calibration.