Monolithic Power Systems Inc. MPQ2179BGQHE-AEC1-P

Overview

MPQ2179BGQHE-AEC1-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 across a 2.5V–6V input range, regulating VOUT down to 0.5V with 1% FB accuracy and 710kHz switching frequency. It integrates 65mΩ high-side and 35mΩ low-side MOSFETs, supports forced CCM operation, and includes PG, SS, OVP, SCP, and thermal shutdown-designed for automotive infotainment power rails.

For engineers reviewing the MPQ2179BGQHE-AEC1-P datasheet, MPQ2179BGQHE-AEC1-P pinout, MPQ2179BGQHE-AEC1-P application, or MPQ2179BGQHE-AEC1-P equivalent, key selection criteria include its -40°C to +150°C junction temperature rating, wettable flank QFN-8 (1.5mm×2mm) package, 100% duty cycle capability in dropout, FCCM mode for stable light-load regulation, and integrated soft-start with external capacitor control.

Technical Context

The MPQ2179BGQHE-AEC1-P uses constant-on-time (COT) control with VIN feed-forward to maintain stable 710kHz switching across input and load variations, enabling fast transient response without loop compensation. Its internal power stage comprises complementary P-channel (65mΩ) and N-channel (35mΩ) MOSFETs optimized for low conduction loss and thermal performance in compact automotive layouts.

Fault management includes cycle-by-cycle peak/valley current limiting (5A/3.5A typ), hiccup-mode short-circuit protection, 116% VREF over-voltage detection with 2μs delay, and thermal shutdown at 170°C with 20°C hysteresis-ensuring robust operation in harsh automotive environments.

Key Specifications

Pinout & Package

MPQ2179BGQHE-AEC1-P is housed in a thermally enhanced, lead-free, wettable flank QFN-8 package (1.5mm × 2mm, 0.5mm pitch), featuring exposed thermal pad for PCB heat dissipation and side-wettable leads for solder joint inspection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS62933RTER and LM61480QRNRRQ1, MPQ2179BGQHE-AEC1-P uniquely balances ultra-small footprint, AEC-Q100 Grade 1 compliance, PG/SS functionality, and optimized 2.5V–6V operation for next-gen automotive domain controllers - making it the most suitable choice for compact, safety-aware infotainment and ADAS sub-systems.

Availability

MPQ2179BGQHE-AEC1-P is available at Aetrix Electronics and suitable for automotive infotainment systems, camera modules, and telematics control units requiring stable component supply with full AEC-Q100 traceability and long-term production support.

Supply support for MPQ2179BGQHE-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 over two decades of expertise in DC/DC conversion, motor drivers, and LED lighting solutions.

The MPQ2179B belongs to MPS's automotive-grade synchronous buck converter product line, engineered specifically for demanding automotive subsystems-including infotainment, ADAS, and body electronics-where small size, thermal resilience, and functional safety readiness are mandatory.

FAQ

What is the minimum recommended soft-start capacitor value for MPQ2179BGQHE-AEC1-P?

The datasheet specifies a minimum soft-start capacitor (CSS) of 6.8nF. This value ensures adequate start-up time to limit inrush current while maintaining stability. Using a smaller capacitor may cause overshoot or instability; larger values increase start-up delay but improve surge immunity. CSS is charged at a nominal 15µA current, yielding tSS ≈ (CSS × 0.5V)/15µA in milliseconds.

Does MPQ2179BGQHE-AEC1-P support 100% duty cycle operation, and under what conditions?

Yes, MPQ2179BGQHE-AEC1-P supports true 100% duty cycle operation during dropout conditions-when VIN approaches VOUT. This allows uninterrupted regulation down to VIN = VOUT + ~0.1V, critical for cold-crank scenarios (e.g., VIN = 2.5V powering a 2.4V rail). The feature is enabled inherently by the COT architecture and does not require external configuration.

How is Power Good (PG) functionality implemented, and what external components are required?

PG is an open-drain output requiring an external pull-up resistor (typically 10kΩ to VIN or system rail). It asserts high when FB voltage exceeds 90% of 0.5V reference (i.e., ≥450mV) and pulls low when FB falls below 84% (≤420mV), with 70μs response delay. No additional filtering or conditioning is needed-PG directly interfaces with MCU GPIO or power sequencer inputs.

What thermal performance can be expected on a standard 4-layer PCB?

On an MPS-standard 4-layer evaluation board (6.3cm × 6.3cm, 2oz copper), θJA is 59°C/W and θJC is 14°C/W. At 3A load and VIN = 5V, typical case temperature rise is ≤30°C above ambient. For automotive designs, thermal pad soldering to inner ground planes and use of thermal vias are essential to maintain TJ ≤150°C under worst-case conditions.

Is MPQ2179BGQHE-AEC1-P compatible with standard lead-free reflow profiles?

Yes, MPQ2179BGQHE-AEC1-P is rated for JEDEC J-STD-020 moisture sensitivity level (MSL) 1 and supports peak reflow temperatures up to 260°C. Its wettable flank QFN-8 package is fully compatible with standard SnAgCu (SAC305) reflow profiles, including ramp-soak-reflow cycles used in automotive electronics manufacturing.

Does the device include output discharge functionality, and how is it controlled?

Yes, MPQ2179BGQHE-AEC1-P features automatic output discharge upon disable: when EN is pulled low, an internal 120Ω MOSFET connects OUT to GND to safely bleed stored energy from output capacitors. Discharge is active by default and requires no external components; to disable it, place a series capacitor between OUT and the load (per datasheet Figure 22).