Monolithic Power Systems Inc. MPQ4425AGQBE-AEC1-P

Overview

MPQ4425AGQBE-AEC1-P from Monolithic Power Systems is a synchronous step-down white LED driver IC with integrated 85mΩ/50mΩ MOSFETs, delivering up to 1.5A output current across 4V–36V input range, operating at 2.2MHz fixed frequency, and qualified to AEC-Q100 Grade-1 for automotive lighting systems.

For engineers reviewing the MPQ4425AGQBE-AEC1-P datasheet, MPQ4425AGQBE-AEC1-P pinout, MPQ4425AGQBE-AEC1-P application, or MPQ4425AGQBE-AEC1-P equivalent, key selection criteria include its wettable flank QFN-13 package, PWM dimming support (100Hz–2kHz), fault-indicating open-drain /FAULT pin, and forced CCM operation for stable low-ripple LED current regulation in harsh automotive environments.

Technical Context

The MPQ4425AGQBE-AEC1-P implements peak-current-mode control with internal 0.2V reference and valley-current detection for over-current protection. Its fixed 2.2MHz switching frequency enables compact magnetics, while frequency foldback to 1.1MHz activates above ~21V input to maintain stability and efficiency.

It integrates dual power MOSFETs (HS R_DS(ON) = 85mΩ, LS R_DS(ON) = 50mΩ), bootstrap gate drive with external BST capacitor and recommended 20Ω series resistor, and analog ground (AGND) internally tied to PGND-eliminating need for external AGND routing.

Key Specifications

Pinout & Package

MPQ4425AGQBE-AEC1-P is housed in a space-saving, AEC-Q100-compliant wettable flank QFN-13 package (2.5mm × 3mm, 0.5mm pitch), enabling automated optical inspection (AOI) of solder joints and enhanced reliability in automotive applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ4425AGQBE-AEC1-P, the MPQ4425AGQB-AEC1 offers identical electrical performance but reduced process verifiability, while the LM3409QMYX/NOPB trades integration for flexibility - making the MPQ4425AGQBE-AEC1-P optimal for compact, production-ready AEC-Q100 exterior lighting designs.

Availability

MPQ4425AGQBE-AEC1-P is available at Aetrix Electronics and suitable for automotive front fog lamps, rear combination lamps, daytime running lights, and adaptive front lighting systems requiring stable component supply with full AEC-Q100 traceability and long-term lifecycle support.

Supply support for MPQ4425AGQBE-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, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MPQ4425A product line delivers AEC-Q100-qualified LED drivers optimized for automotive exterior lighting, emphasizing integration, EMI robustness, and fault-aware operation in demanding vehicular environments.

FAQ

What is the purpose of the BST pin and why is a 20Ω resistor recommended?

The BST pin supplies the floating gate drive voltage for the internal high-side MOSFET via an external bootstrap capacitor. A 20Ω resistor between SW and BST dampens ringing and reduces voltage spikes at the switch node-critical for EMI control and preventing gate oxide stress. This resistor value balances spike suppression against efficiency loss from added conduction loss.

Can MPQ4425AGQBE-AEC1-P drive more than 1.5A LED current?

No-the device is rated for 1.5A continuous output current under specified thermal conditions (T_J ≤ 125°C). Attempting higher currents triggers over-current protection with valley-current detection, causing frequency foldback and potential thermal shutdown. For >1.5A, parallel configurations or higher-current alternatives like MPQ4425A's larger siblings must be evaluated.

How does the /FAULT pin indicate different fault types?

The /FAULT pin is an open-drain output pulled low identically for LED open, LED short, or thermal shutdown-no internal differentiation. Fault type must be inferred externally: e.g., by monitoring V_FB (low = open, high = short) or die temperature via thermal pad resistance. The pin asserts within 10μs of fault detection and remains low until reset by cycling EN or clearing the fault condition.

Is the EN/DIM pin compatible with direct microcontroller GPIO control?

Yes-EN/DIM accepts logic-high (≥1.45V) to enable and logic-low (≤1.0V) to disable. However, due to its internal 400kΩ pull-down and 6.5V Zener clamp, direct MCU connection is safe only if the GPIO voltage stays ≤6V. For 3.3V or 5V MCUs, no series resistor is needed; for 12V systems, a ≥55kΩ pull-up is required to limit current below 100μA.

What distinguishes the "E" suffix in MPQ4425AGQBE-AEC1-P?

"E" denotes the wettable flank variant of the QFN-13 package: side-wettable leads allow automated optical inspection (AOI) of solder fillets during reflow, improving defect detection in automotive PCB assembly. It shares identical electrical specs and pinout with the standard MPQ4425AGQB-AEC1 but adds manufacturability assurance for safety-critical exterior lighting modules.

Does MPQ4425AGQBE-AEC1-P support analog dimming?

No-it does not support analog (DC) dimming via FB or other pins. Dimming is exclusively implemented via PWM applied to the EN/DIM pin (100Hz–2kHz). Attempting analog dimming by modulating FB voltage violates the internal error amplifier's operating point and causes unstable regulation or OCP triggering.

How is input voltage ripple estimated for this IC?

Input ripple ΔV_IN is calculated using ΔV_IN = I_LED × (1 − V_OUT/V_IN) / (f_SW × C_IN). For 1.5A output, 12V input, 6.4V LED string, 2.2MHz switching, and 10µF C_IN, ripple is ≈42mV. Designers must ensure C_IN's RMS current rating exceeds I_LED/2 (≥0.75A) to prevent capacitor overheating.