Monolithic Power Systems Inc. MPQ2484GF-AEC1-Z

Overview

MPQ2484GF-AEC1-Z from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified, multi-topology LED controller IC for automotive exterior lighting. It supports buck, boost, and buck-boost configurations with 4.5V–45V input range, 75V max boost output, peak-current-mode control, and programmable 100kHz–2.2MHz switching frequency. It delivers precise LED current regulation (±5% reference at 100mV), integrated P-channel dimming driver, and fault flag output - deployed in headlights and DRLs.

For engineers reviewing the MPQ2484GF-AEC1-Z datasheet, MPQ2484GF-AEC1-Z pinout, MPQ2484GF-AEC1-Z application, or MPQ2484GF-AEC1-Z equivalent, key selection considerations include its AEC-Q100 qualification, multi-topology flexibility, dual-dimming mode support (two-step and PWM), robust LED short/open/overvoltage protections, and TSSOP-28EP package thermal performance.

Technical Context

The MPQ2484GF-AEC1-Z implements peak-current-mode control with cycle-by-cycle current limiting and external slope compensation via CS pin, enabling stable loop response across topologies. Its internal 8.5V VCC regulator powers gate drivers and control logic, while VREF (2.37V) serves as reference for LED short detection and ISET biasing.

Dimming architecture integrates three modes: two-step (H/L + LSET), external PWM (PDIM), and analog (ISET/ISETMD), with dedicated DIMO driver for external P-channel MOSFET. Fault management includes active-low open-drain /FLT output with 30µs recovery delay and hierarchical protection thresholds for LED short (level I/II), open, SCP, OVP, and thermal shutdown at 170°C.

Key Specifications

Pinout & Package

MPQ2484GF-AEC1-Z is housed in a thermally enhanced TSSOP-28EP package (4.4mm × 9.7mm, 0.65mm pitch) with exposed thermal pad for PCB heat dissipation. The 28-pin layout supports full multi-topology control, dual dimming paths, and comprehensive fault sensing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ2484GF-AEC1-Z, the MPQ2484GQ-AEC1-Z offers superior thermal metrics in a smaller QFN package but demands layout redesign, while the LM3409QMYX/NOPB sacrifices automotive qualification, topology flexibility, and advanced dimming for lower cost and simpler integration.

Availability

MPQ2484GF-AEC1-Z is available at Aetrix Electronics and suitable for automotive headlights, daytime running lights (DRLs), and fog lights requiring stable component supply across extended temperature ranges and stringent quality traceability.

Supply support for MPQ2484GF-AEC1-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 power management ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MPQ2484 product line targets automotive LED lighting systems requiring AEC-Q100 qualification, multi-topology flexibility, and integrated protection - developed specifically to replace discrete solutions in headlight and DRL modules.

FAQ

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

The MPQ2484GF-AEC1-Z supports buck, boost, and buck-boost topologies through external component selection - no internal configuration bits or pins. Topology is determined solely by circuit layout: buck uses inductor between VIN and LED+, boost places inductor between VIN and NGATE, and buck-boost employs coupled inductor or separate L1/L2. All share the same IC pinout and control algorithm.

How does the two-step dimming function work, and what external components are required?

Two-step dimming uses H/L and LSET pins: H/L selects full-brightness (high) or dimmed level (low), while LSET sets the dimmed current via resistor divider from VREF. DFSET connects to GND via 8.06kΩ for PWM generation. No microcontroller is needed - dimming state is purely hardware-controlled with sub-microsecond response.

Can MPQ2484GF-AEC1-Z drive multiple LED strings independently?

No - it regulates current for a single LED string. However, multiple MPQ2484GF-AEC1-Z ICs can be synchronized via the SYNC pin to operate at identical switching frequencies, minimizing beat frequencies and EMI in multi-string systems such as matrix headlights.

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 dimming switch for improved dimming linearity and added protection against LED short-circuits in boost/buck-boost modes. When high, DIMO is disabled and the IC relies on PWM dimming via PDIM.

Does MPQ2484GF-AEC1-Z require external loop compensation, and where is it connected?

Yes - external loop compensation is mandatory and connected to the COMP pin (24). A Type II or Type III network (resistor + capacitor + optional second capacitor) must be placed between COMP and PGND to stabilize the current-regulation feedback loop across all topologies and load conditions.

How is LED open-circuit protection implemented, and what is its response time?

LED open protection triggers when VFB falls below VICS+ by >1.17V (OVP threshold), indicating loss of LED string continuity. The /FLT pin asserts within 32 switching cycles (e.g., ~78µs at 410kHz), and remains active until VFB recovers for 30µs - ensuring fast detection without false triggering during transient dips.

Is the VREF pin intended only for LED short detection, or does it serve other functions?

VREF (2.37V) serves three roles: (1) reference for LED short detection circuits (LEDSC1/LEDSC2), (2) bias source for ISET current-setting resistor networks, and (3) voltage reference for external thermal derating circuits using NTC thermistors tied to ISET. A 1nF–10nF ceramic capacitor to GND is mandatory for stability.