Monolithic Power Systems Inc. MPQ2484GF-AEC1-P

Overview

MPQ2484GF-AEC1-P from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified, multi-topology LED controller supporting buck, boost, and buck-boost configurations for automotive exterior lighting. It operates from 4.5V to 45V input, delivers up to 75V boost output, features peak current mode control, configurable spread-spectrum switching (100kHz–2.2MHz), and integrated P-channel dimming MOSFET driver. It is deployed in headlight and DRL systems requiring robust fault protection and thermal resilience.

For engineers reviewing the MPQ2484GF-AEC1-P datasheet, MPQ2484GF-AEC1-P pinout, MPQ2484GF-AEC1-P application, or MPQ2484GF-AEC1-P equivalent, key selection criteria include its 75V max boost capability, dual-dimming support (two-step and PWM), AEC-Q100 qualification, TSSOP-28EP package with exposed pad, and comprehensive fault detection including LED open/short, OVP, SCP, and thermal shutdown.

Technical Context

The MPQ2484GF-AEC1-P implements peak current mode control with cycle-by-cycle current limiting and external slope compensation via the CS pin, enabling stable regulation across topologies. Its programmable switching frequency (via FSET resistor or SYNC input) and configurable frequency spread spectrum (FSS) reduce EMI without compromising transient response.

It integrates a dedicated dimming architecture with three modes: two-step dimming (H/L + LSET), external PWM dimming (PDIM), and analog dimming (ISET/ISETMD), all coordinated with fault-aware DIMO gate drive. Protection logic includes hierarchical LED short detection (LEDSC1/LEDSC2), VLED+ short sensing, and hiccup-mode recovery timed by internal clock cycles.

Key Specifications

Pinout & Package

TSSOP-28EP package with exposed thermal pad (PGND-connected); 28-pin leaded package optimized for automotive PCB assembly and thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ2484GF-AEC1-P, MPQ2484GF-Z omits automotive qualification but retains full feature parity, while LM3409QMYX/NOPB trades topology flexibility and integrated dimming for TI's ecosystem support and simpler buck-only implementation.

Availability

MPQ2484GF-AEC1-P is available at Aetrix Electronics and suitable for automotive headlights, DRLs, and fog lights requiring stable component supply, AEC-Q100 compliance, and multi-topology design reuse.

Supply support for MPQ2484GF-AEC1-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 power management ICs for automotive, industrial, and consumer applications.

The MPQ2484 belongs to MPS's AEC-Q100-qualified LED controller product line, designed specifically for automotive exterior lighting systems demanding high-voltage capability, multi-topology flexibility, and robust fault handling.

FAQ

What topologies does the MPQ2484GF-AEC1-P support, and how is topology selected?

It supports buck, boost, and buck-boost topologies through external component selection-no internal configuration bits. Topology is determined by the external power stage layout: boost uses inductor between VIN and VLED+, buck places inductor between VLED+ and LED cathode, and buck-boost employs coupled inductor or four-switch arrangement. The IC's current-sense and gate-drive architecture adapts automatically.

How does the two-step dimming function work, and what pins control it?

Two-step dimming uses the H/L pin to toggle between full-scale and reduced-current modes, with the LSET pin setting the reduced duty cycle via a resistor divider from VREF. When H/L is logic low, the internal triangular waveform (generated at DFSET) is compared to LSET voltage to produce PWM dimming. DFSET capacitor value sets dimming frequency; recommended 8.06kΩ resistor disables DFSET for PWM mode.

What protections are included, and how is fault status reported?

Protections include cycle-by-cycle current limit, LED open/short (via LEDSC1/LEDSC2), VLED+ short, output OVP (via VFB), SCP, and thermal shutdown. All faults assert the open-drain /FLT pin low; recovery requires 30µs fault-free window before /FLT releases. Fault sources are distinguishable via timing (e.g., SCP activates in 32 clock cycles, LED short in 4096).

Can the MPQ2484GF-AEC1-P synchronize to an external clock, and what are the voltage thresholds?

Yes, the SYNC pin accepts external clock signals from 100kHz to 2.2MHz. Logic high must exceed 1.4V, logic low must be below 0.6V, and minimum pulse width is 200ns. When SYNC is active, the FSET pin is disabled. Floating SYNC disables synchronization and enables FSET-based frequency setting.

What is the role of the DMODE pin, and when should it be used?

DMODE enables or disables the external P-channel MOSFET driver (DIMO). When pulled low, DIMO actively drives a high-side P-MOSFET for improved dimming performance and added protection in boost/buck-boost modes. When pulled high, DIMO is disabled. This allows optional use of the integrated dimming switch based on system-level safety or efficiency requirements.

How is LED current accuracy maintained across temperature and process variation?

Current regulation uses a 100mV (±5%) feedback reference (VICS_FB) with <±1% drift over -40°C to +125°C. Accuracy is enhanced by IREF bias current setting (VIREF = 0.805V ±20mV), which scales ISET current gain (95–105%), and by external loop compensation (COMP pin) for stability across LED forward-voltage variance.

Is the TSSOP-28EP package thermally sufficient for 3.9W dissipation in automotive environments?

Yes-the package has θJA = 32°C/W on a 4-layer JEDEC board, enabling ~3.9W continuous dissipation at TA = 85°C (TJ = 150°C). In practice, thermal relief is achieved via the exposed PGND pad soldered to a large copper pour, and automotive designs typically operate below 2.5W under typical LED loads, ensuring margin for transient conditions.