Monolithic Power Systems Inc. MPQ2483DQ-AEC1-LF-P

Overview

MPQ2483DQ-AEC1-LF-P from Monolithic Power Systems is an AEC-Q100 qualified 55V, 2.5A peak-current LED driver IC supporting buck and inverting buck-boost topologies with programmable switching frequency (250 kHz to 1.7 MHz), 0.198 V feedback reference, and integrated 0.28 Ω MOSFET - deployed in automotive headlamps and LCD backlight systems requiring robust thermal and fault protection.

For engineers reviewing the MPQ2483DQ-AEC1-LF-P datasheet, MPQ2483DQ-AEC1-LF-P pinout, MPQ2483DQ-AEC1-LF-P application, or MPQ2483DQ-AEC1-LF-P equivalent, this device delivers verified analog/PWM dimming control via a single EN/DIM pin, open-string and short-circuit protection, and stable operation with low-ESR ceramic capacitors across its 4.5–55 V input range.

Technical Context

The MPQ2483DQ-AEC1-LF-P implements current-mode control with slope compensation for stable loop response and fast transient recovery. Its error amplifier integrates FB voltage error against a precise 0.198 V reference to regulate LED current through external sense resistor feedback.

It supports dual-mode operation: step-down (buck) for LED strings below input voltage, and inverting buck-boost for strings exceeding input - enabled by separate INGND and VSS pins that isolate dimming/enable references from high-side switching noise.

Key Specifications

Pinout & Package

MPQ2483DQ-AEC1-LF-P is housed in a thermally enhanced 10-pin QFN package (3 mm × 3 mm, 0.5 mm pitch) with exposed thermal pad connected to VSS. The package supports high-power density layout and meets AEC-Q100 Grade 1 (−40°C to +125°C T_J) requirements.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ2483DQ-AEC1-LF-P, MPQ2489DQ-AEC1-LF-P offers +40% current headroom in identical footprint, while LM3409QMYX/NOPB trades integration for external FET control - making the MPQ2483 optimal for space-constrained AEC-Q100-compliant designs needing 2.5 A with minimal BOM count.

Availability

MPQ2483DQ-AEC1-LF-P is available at Aetrix Electronics and suitable for automotive lighting, LCD backlight panels, and industrial LED fixtures requiring stable component supply, AEC-Q100 qualification, and long-term production continuity.

Supply support for MPQ2483DQ-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 MPQ2483 belongs to MPS's automotive-grade LED driver product line, engineered specifically for robustness in harsh environments - emphasizing fault resilience, wide input range, and seamless integration into vehicle lighting ECUs.

FAQ

What is the recommended R_SET resistor value to achieve 500 kHz switching frequency?

Per the MPQ2483 datasheet curve, a 100 kΩ resistor from RSET to VSS yields approximately 500 kHz. This value balances EMI suppression and efficiency - lower frequencies improve conduction loss but increase inductor size, while higher frequencies reduce passive size but raise switching loss. Always verify stability with COMP compensation network.

How does the MPQ2483 handle open LED string faults?

When an LED string opens, FB voltage drops near 0 V. The controller increases duty cycle until OVP pin voltage reaches 1.2 V, triggering shutdown. Recovery occurs only after OVP voltage falls below hysteresis threshold (1.14 V). This prevents uncontrolled voltage rise and protects downstream components.

Can EN/DIM be used for both analog and PWM dimming simultaneously?

No - the EN/DIM pin operates in mutually exclusive modes. Analog dimming uses DC voltage (0.7–1.4 V); PWM dimming requires square-wave signal (>1.4 V amplitude, 100 Hz–2 kHz). Applying both concurrently causes undefined behavior. Mode selection is determined by signal type, not configuration register.

What is the purpose of the separate INGND pin?

INGND provides a dedicated reference for EN/DIM signals, isolating dimming control from high di/dt return paths on VSS. This prevents false triggering during SW node transitions and ensures accurate analog dimming in buck-boost configurations where VSS carries switching current.

Is the exposed thermal pad on the QFN package electrically connected?

Yes - the exposed pad is internally tied to VSS and must be soldered to a PCB copper pour connected to the main VSS net. Thermal resistance drops from θ_JA = 50 °C/W to <30 °C/W with proper pad connection, enabling sustained 2.5 A operation at +85°C ambient.

Does the MPQ2483 support synchronous rectification?

No - the MPQ2483 drives an external Schottky diode (not a synchronous MOSFET) in buck topology. Its SW pin is designed for diode-based freewheeling; no gate-drive capability or timing control for synchronous FETs is provided.

What is the minimum recommended input capacitance?

A 4.7 µF X5R/X7R ceramic capacitor placed within 5 mm of VDD and VSS pins is mandatory. Lower values risk input voltage sag and increased EMI due to high di/dt ripple current; tantalum or aluminum electrolytics are not recommended due to ESR and lifetime limitations.