Monolithic Power Systems Inc. MPQ2489DQ-AEC1-LF-Z

Overview

MPQ2489DQ-AEC1-LF-Z from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified step-down white LED driver IC with 6V–55V input range, integrated 60V/1.41A MOSFET, 202mV feedback reference voltage, and hysteretic control architecture for high-accuracy LED current regulation in automotive lighting systems.

For engineers reviewing the MPQ2489DQ-AEC1-LF-Z datasheet, MPQ2489DQ-AEC1-LF-Z pinout, MPQ2489DQ-AEC1-LF-Z application, or MPQ2489DQ-AEC1-LF-Z equivalent, key selection criteria include wide-input operation under battery transients, dual PWM/analog dimming support, open/short LED protection, thermal shutdown, and QFN6 package suitability for space-constrained automotive modules.

Technical Context

The MPQ2489DQ-AEC1-LF-Z implements a fixed-frequency hysteretic control loop that regulates LED current via high-side sensing without external compensation components. Its internal 1.275V reference sets both enable threshold (0.2V) and current-sense reference (202mV ±30mV), enabling fast transient response and stable operation across -40°C to +125°C junction temperature.

It integrates a 60V rated MOSFET with 0.5Ω R_DS(on), supports 100ns minimum on/off times, and delivers ≥95% efficiency at 550mA output. Dimming is implemented through the EN/DIM pin, accepting either 0.3–2.5V analog control (25–200% I_LED) or 100Hz–2kHz PWM signals with 1000:1 resolution.

Key Specifications

Pinout & Package

MPQ2489DQ-AEC1-LF-Z is housed in a thermally enhanced QFN6 (3mm × 3mm, 0.75mm height) package with exposed thermal pad. Pin 1 is SW (internal MOSFET drain), Pins 2 & 5 are GND, Pin 3 is EN/DIM (dual-function enable/dimming input), Pin 4 is RS (high-side current sense input), and Pin 6 is IN (input supply).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down white LED driver applications.

Compared with LM3409QMY/NOPB and TPS92630QPWPRQ1, MPQ2489DQ-AEC1-LF-Z uniquely combines integrated 60V switching, AEC-Q100 Grade 1 qualification, and dual dimming modes in a 3×3mm QFN-making it optimal for space- and reliability-constrained automotive LED systems.

Availability

MPQ2489DQ-AEC1-LF-Z is available at Aetrix Electronics and suitable for automotive headlamp modules, truck exterior lighting, and emergency vehicle warning lights requiring stable component supply under AEC-Q100-compliant production programs.

Supply support for MPQ2489DQ-AEC1-LF-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 analog and power ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MPQ2489 belongs to MPS's automotive-grade LED driver product line, engineered specifically for high-reliability, wide-input-range constant-current LED applications in harsh vehicular environments.

FAQ

What is the maximum recommended input voltage for MPQ2489DQ-AEC1-LF-Z?

The absolute maximum input voltage is +60V, but the recommended operating range is 6V to 55V per datasheet specifications. Operation above 55V risks exceeding internal MOSFET breakdown limits and invalidates AEC-Q100 qualification margins. For 48V systems experiencing ISO 7637-2 Pulse 5a (load dump), external clamping is advised if transients exceed 55V.

How does the EN/DIM pin support both analog and PWM dimming simultaneously?

The EN/DIM pin does not support simultaneous modes-it operates in one mode at a time. Analog dimming uses a DC voltage (0.3–2.5V) to linearly scale LED current; PWM dimming applies a square wave (100Hz–2kHz) whose duty cycle determines average current. The internal 1.25V pull-up enables soft-start in analog mode; for PWM, an external NPN transistor is recommended to isolate the signal from the reference.

Is an output capacitor required for stable operation?

No output capacitor is required for basic operation, as the MPQ2489 regulates LED current directly via hysteretic control. However, if peak-to-peak LED current ripple must be kept below 30% of average current, a 2.2µF ceramic capacitor across the LED string is recommended. Larger values further reduce ripple but add cost and board area.

What thermal derating applies above 25°C ambient?

With θ_JA = 50°C/W, the maximum continuous power dissipation decreases linearly: P_D(MAX) = (150°C − T_A) / 50. At 85°C ambient, max dissipation drops to 1.3W. To sustain 1A output at elevated temperatures, ensure adequate PCB copper area under the thermal pad and consider forced airflow or heatsinking per JEDEC 51-7 guidelines.

Does MPQ2489DQ-AEC1-LF-Z support synchronization to an external clock?

No, the MPQ2489DQ-AEC1-LF-Z uses a self-oscillating hysteretic control architecture and does not provide an external clock sync input. Its switching frequency varies with input voltage, output current, and inductance-typically ranging from 200kHz to 600kHz. For EMI-sensitive designs, spread-spectrum or fixed-frequency alternatives like MPQ4470A would be required.

How is open LED protection implemented without additional components?

Open LED protection is inherent: when no current flows through the RS pin, the feedback voltage falls below the 187mV lower threshold (per datasheet), triggering internal logic to disable the MOSFET within microseconds. This prevents uncontrolled voltage rise at the SW node and avoids damage to the LED string or driver-no external comparators or sense resistors are needed.

Can MPQ2489DQ-AEC1-LF-Z drive multiple parallel LED strings?

No-it is designed for single-string constant-current operation. Driving parallel strings requires individual current regulation per string to avoid thermal runaway; the MPQ2489 lacks multi-channel capability or current-sharing features. For multi-string applications, use separate MPQ2489 units or select a multi-channel driver like MPQ4470A.