Monolithic Power Systems Inc. MPQ2143DJ-AEC1-LF-P

Overview

MPQ2143DJ-AEC1-LF-P from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified synchronous step-down DC/DC converter delivering up to 3A continuous output current from a 2.5V–5.5V input, with 0.6V minimum output voltage, 1.2MHz switching frequency, and 40μA quiescent current. It integrates 80mΩ high-side and 40mΩ low-side MOSFETs and employs constant-on-time (COT) control for fast transient response in automotive infotainment power rails.

For engineers reviewing the MPQ2143DJ-AEC1-LF-P datasheet, MPQ2143DJ-AEC1-LF-P pinout, MPQ2143DJ-AEC1-LF-P application, or MPQ2143DJ-AEC1-LF-P equivalent, key selection criteria include automotive-grade thermal shutdown (150°C), ±10% power-good window, cycle-by-cycle over-current protection, and TSOT23-8 package compatibility with space-constrained PCB layouts.

Technical Context

The MPQ2143DJ-AEC1-LF-P uses constant-on-time (COT) control with input-voltage feed-forward to maintain stable 1.2MHz switching across its 2.5V–5.5V input range and supports 100% duty cycle in dropout. Its internal 0.6V reference and ±2% feedback voltage tolerance enable precise output regulation down to 0.6V.

It integrates dual MOSFETs (80mΩ PCH / 40mΩ NCH), features EN-controlled soft-start (1.3ms) and soft-stop (1ms), and implements hiccup-mode short-circuit protection triggered at 4.8A high-side current limit. The open-drain PG pin uses a 500kΩ internal pull-up to VIN and asserts when FB is within ±10% of 0.6V.

Key Specifications

Pinout & Package

MPQ2143DJ-AEC1-LF-P is housed in a thermally enhanced TSOT23-8 package (2.9mm × 1.6mm × 0.85mm), optimized for high-power density in automotive PCBs with limited board area and strict thermal constraints.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ2179 and TPS62864AQRGZTQ1, MPQ2143DJ-AEC1-LF-P offers the smallest footprint and lowest component count for 3A/5.5V automotive POL needs but lacks digital interface and extended input range - making it optimal for space-constrained, analog-focused legacy platforms.

Availability

MPQ2143DJ-AEC1-LF-P is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and telematics control units requiring stable component supply with full AEC-Q100 Grade 1 traceability and long-term lifecycle support.

Supply support for MPQ2143DJ-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 MPQ2143 belongs to MPS's automotive-qualified DC/DC converter product line, engineered specifically for demanding automotive subsystems where small size, low IQ, and AEC-Q100 reliability are mandatory - not general-purpose industrial or consumer power conversion.

FAQ

Is MPQ2143DJ-AEC1-LF-P recommended for new designs?

No - Monolithic Power Systems explicitly states "NOT RECOMMENDED FOR NEW DESIGNS, REFER TO MPQ2179" in the datasheet. MPQ2143DJ-AEC1-LF-P remains fully supported for existing automotive platforms with AEC-Q100 Grade 1 requirements, but MPQ2179 offers higher current, wider input range, and lower IQ for future designs.

What is the function of the OUT pin on MPQ2143DJ-AEC1-LF-P?

The OUT pin is the output voltage sense terminal, providing Kelvin connection to the output capacitor's positive node. It enables accurate regulation by compensating for IR drop across PCB traces between the IC and load, improving load regulation to ±0.5% across 0–3A output current.

How does the PG pin behave during undervoltage conditions?

When the FB voltage falls outside the ±10% window around 0.6V - such as during startup, output short, or input brownout - the PG pin is actively pulled low by an internal MOSFET (R_DS(on) < 100Ω). It returns high only after FB stabilizes within regulation, providing a clean, glitch-free power-good signal for system reset controllers.

Can MPQ2143DJ-AEC1-LF-P operate with 100% duty cycle?

Yes - the device supports 100% duty cycle in dropout mode, allowing V_OUT to track V_IN when input voltage drops near or below the regulated output level. This feature maintains uninterrupted power to critical loads during automotive cold-crank events where VIN may fall to 2.5V.

What is the maximum allowable output capacitance for safe soft-stop operation?

To prevent VIN from exceeding its 6V absolute maximum rating during soft-stop discharge, output capacitance C2 must satisfy C2 < (C1 × (VIN − VOUT)²) / 36, where C1 is the input capacitance. For example, with C1 = 20μF, VIN = 5V, and VOUT = 3.3V, C2 must be less than 20μF.

Does MPQ2143DJ-AEC1-LF-P require external compensation components?

No - the constant-on-time (COT) control architecture eliminates the need for external compensation networks. Stability is inherently achieved with low-ESR ceramic output capacitors (e.g., 22μF X5R), simplifying layout and reducing BOM count compared to voltage-mode or current-mode controllers.

What is the thermal resistance (θ_JA) of the TSOT23-8 package?

The junction-to-ambient thermal resistance θ_JA for MPQ2143DJ-AEC1-LF-P in TSOT23-8 is 100°C/W when mounted on a standard 4-layer JEDEC PCB per JESD51-7. With 3A load at 5V input/1.2V output, power dissipation is ~0.3W, resulting in ~30°C junction rise above ambient - well within the 125°C max operating junction temperature.