Monolithic Power Systems Inc. MP8771GQ-P

Overview

MP8771GQ-P from Monolithic Power Systems is a fully integrated, synchronous step-down DC/DC converter delivering 10A continuous output current with 3V–18V input range, fixed 700kHz switching frequency, and COT control for fast transient response in compact QFN-16 (3mm×3mm) package. It integrates 17mΩ/8mΩ HS/LS MOSFETs, supports pre-biased start-up, and features EN, PG, SS, and comprehensive protection including OCP, SCP, UVP, and thermal shutdown - deployed in security cameras and flat-panel displays.

For engineers reviewing the MP8771GQ-P datasheet, MP8771GQ-P pinout, MP8771GQ-P application, or MP8771GQ-P equivalent, key selection criteria include its 10A output capability at 18V max input, 0.6V adjustable VOUT, 100μA quiescent current, and QFN-16 thermal performance with θJA = 38°C/W on 4-layer PCB - critical for high-density power delivery in portable and industrial systems.

Technical Context

The MP8771GQ-P employs constant-on-time (COT) control architecture to achieve rapid load transient response without external compensation, maintaining stable regulation across wide VIN and VOUT ranges. Its valley-current limiting scheme enables precise over-current detection via low-side FET sensing, triggering hiccup-mode recovery upon fault.

Internal 3.4V VCC regulator powers all circuitry across full 3V–18V input, with UVLO thresholds at 2.8V (rising) and 2.45V (falling). Bootstrap charging uses an internal diode and external BST capacitor, with recommended R_BST < 4.7Ω to sustain gate drive under heavy load and ensure robust high-side MOSFET turn-on.

Key Specifications

Pinout & Package

MP8771GQ-P is housed in a thermally enhanced QFN-16 (3mm × 3mm, 0.5mm pitch) package with exposed thermal pad (PGND-connected) for efficient heat dissipation. Pin 1 and 15 are NC; pins 9–13 form a unified PGND plane requiring low-impedance PCB copper pour and multiple vias to internal ground layers.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP8771GQ-P, MPQ8771-AEC1 adds automotive reliability at higher cost and same footprint, while RTQ2132B-QT trades current capability, protection features, and control architecture for reduced price and simpler design - making MP8771GQ-P optimal for 10A commercial/industrial POL where sequencing, efficiency, and robustness are prioritized.

Availability

MP8771GQ-P is available at Aetrix Electronics and suitable for security cameras, flat-panel displays, and digital set-top boxes requiring stable component supply, long-term production continuity, and RoHS-compliant packaging.

Supply support for MP8771GQ-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 MP8771 belongs to MPS's high-current monolithic buck converter product line, engineered for compact, high-efficiency point-of-load regulation in space-constrained consumer, industrial, and networking equipment - emphasizing integration, thermal performance, and ease of use.

FAQ

What is the maximum supported output voltage for MP8771GQ-P?

The MP8771GQ-P supports output voltages from 0.6V up to 12V, limited by the maximum duty cycle (D_MAX) and input voltage per the relationship V_OUT ≤ V_IN × D_MAX. At 18V input, the practical upper limit remains 12V due to internal timing constraints and recommended operating conditions - exceeding this risks instability or failure to regulate.

Can MP8771GQ-P operate with a 2.5V input supply?

No. The absolute minimum input voltage is 3V per Absolute Maximum Ratings and Recommended Operating Conditions. At 2.5V, the internal VCC regulator cannot sustain 3.4V bias, causing UVLO activation and disabling switching. Operation below 3V is not functional or characterized.

How is thermal performance affected by PCB layout?

Thermal resistance θ_JA drops from 50°C/W (JESD51-7 standard board) to 38°C/W on the EV8771-Q-00A 4-layer evaluation board - achieved via 1-in² exposed PGND copper pour with ≥6 thermal vias to inner ground planes. Insufficient copper or missing vias increase junction temperature by >25°C at 10A, risking thermal shutdown.

Does MP8771GQ-P support forced PWM mode?

No. The MP8771GQ-P automatically transitions between CCM (PWM-like) at heavy loads and PFM (skip-mode) at light loads to maximize efficiency. There is no pin or register to force continuous switching; light-load efficiency gains come from reduced switching losses during idle periods.

What is the recommended BST capacitor value and type?

A 0.1µF X7R ceramic capacitor rated for ≥16V is recommended between BST and SW pins. It must be placed within 2mm of the IC with short, wide traces to minimize inductance. Larger values (>0.22µF) offer no benefit and may slow bootstrap recharge; tantalum or electrolytic types are unsuitable due to ESR and reliability concerns.

Is MP8771GQ-P compatible with ceramic output capacitors only?

Yes - the COT control architecture and internal compensation are optimized for ceramic output capacitors (e.g., 22µF–100µF, X5R/X7R). Aluminum polymer or electrolytic caps introduce ESR that degrades transient response and may cause instability; their use is not supported or characterized.

How does the power-good (PG) pin behave during thermal shutdown?

During thermal shutdown, the PG pin is pulled low immediately - independent of FB voltage - to signal fault condition to system controllers. PG remains low until junction temperature falls below the hysteresis threshold (~130°C) and normal regulation resumes, at which point PG asserts high after its standard 50µs delay once V_FB reaches 90% of 600mV.