Monolithic Power Systems Inc. MPQ2128DG-AEC1-LF-P

Overview

MPQ2128DG-AEC1-LF-P from Monolithic Power Systems is an AEC-Q100 qualified 3MHz synchronous step-down DC/DC converter delivering up to 1A output current from a 2.5V–6V input, with 0.6V minimum output voltage, integrated high- and low-side MOSFETs, and <1μA shutdown current-used in automotive infotainment power rails and ADAS camera modules.

For engineers reviewing the MPQ2128DG-AEC1-LF-P datasheet, MPQ2128DG-AEC1-LF-P pinout, MPQ2128DG-AEC1-LF-P application, or MPQ2128DG-AEC1-LF-P equivalent, key selection criteria include its 3MHz switching frequency for compact filter design, AEC-Q100 Grade 1 qualification (–40°C to +125°C), current-mode control for fast transient response, and QFN8 (2mm×2mm) thermally enhanced package with exposed pad.

Technical Context

The MPQ2128DG-AEC1-LF-P implements slope-compensated peak-current-mode PWM control with fixed 3MHz oscillator frequency, enabling stable operation at duty cycles up to 100% and supporting dropout operation down to VIN ≈ VOUT. Its internal PFET (200mΩ) and NFET (150mΩ) switches eliminate external diode requirements and enable >95% peak efficiency at 1.8V/1A output.

It integrates cycle-by-cycle over-current protection, thermal shutdown (150°C threshold with 20°C hysteresis), and soft-start (100µs), with FB regulation accuracy of ±2% over –40°C to +125°C and EN logic thresholds of 1.6V (high) / 0.4V (low) for robust enable control in noisy automotive environments.

Key Specifications

Pinout & Package

MPQ2128DG-AEC1-LF-P is housed in a thermally optimized 2mm × 2mm, 8-pin QFN package with exposed thermal pad (pin 7), rated for 2.5W continuous power dissipation at T_A = 25°C (θ_JA = 50°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS62130A-Q1 and RTQ2132B-QT, MPQ2128DG-AEC1-LF-P offers the widest input range (2.5V min), smallest footprint (QFN8), and highest switching frequency-making it optimal for space-constrained, low-VIN automotive modules where 1A is sufficient.

Availability

MPQ2128DG-AEC1-LF-P is available at Aetrix Electronics and suitable for automotive camera modules, infotainment SoC core rails, and ADAS sensor bias supplies requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.

Supply support for MPQ2128DG-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 design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MPQ2128 belongs to MPS's automotive-qualified DC/DC converter product line, engineered specifically for demanding vehicular environments requiring high efficiency, small size, and guaranteed reliability across extended temperature ranges.

FAQ

What is the minimum input voltage supported by MPQ2128DG-AEC1-LF-P?

The device operates down to 2.5V input, enabling direct use with single-cell Li-ion batteries across their full discharge curve (4.2V to ~2.7V), including deep discharge conditions. Below 2.5V, UVLO disables operation to protect internal circuitry.

Does MPQ2128DG-AEC1-LF-P require an external compensation network?

No. The MPQ2128DG-AEC1-LF-P uses internal compensation optimized for standard 1.2µH inductors and 10–22µF ceramic output capacitors. No external Type-II or Type-III compensation components are needed for stable operation.

How is thermal performance ensured in the QFN8 package?

Thermal performance relies on soldering the exposed thermal pad to ≥100mm² of inner-layer or bottom-side copper pour with ≥4 thermal vias (0.3mm diameter). This achieves θ_JA ≈ 50°C/W, allowing 1A continuous output at +85°C ambient with proper layout.

Can MPQ2128DG-AEC1-LF-P operate in 100% duty cycle mode?

Yes. When input voltage drops near the output voltage, the controller extends the high-side FET on-time beyond one switching cycle, achieving 100% duty cycle to maintain regulation-critical for maintaining camera module operation during cold-crank automotive transients.

What is the feedback voltage accuracy over temperature?

The FB reference voltage is 0.594V (typ.) at 25°C, with guaranteed range of 0.574V to 0.614V over –40°C to +125°C junction temperature-corresponding to ±3.4% total error, sufficient for most automotive core and I/O rail applications.

Is the EN pin compatible with 1.8V logic microcontrollers?

Yes. With EN high threshold of 1.6V (min) and low threshold of 0.4V (max), the pin accepts standard 1.8V GPIO outputs directly-no level-shifting required-enabling seamless integration with automotive microcontrollers like Infineon AURIX or ST SPC5.