Monolithic Power Systems Inc. MP8774HGQ-P

Overview

MP8774HGQ-P from Monolithic Power Systems is a synchronous step-down DC/DC converter IC delivering 12A continuous output current, operating from 3V to 18V input, with fixed 1.4MHz switching frequency, integrated 16mΩ/5.5mΩ MOSFETs, and power-good (PG) + external soft-start functionality - deployed in security cameras and AP routers for high-density point-of-load regulation.

For engineers reviewing the MP8774HGQ-P datasheet, MP8774HGQ-P pinout, MP8774HGQ-P application, or MP8774HGQ-P equivalent, key selection criteria include its COT control architecture for fast transient response, thermal shutdown at 150°C, PG open-drain timing behavior, and QFN-16 (3mm×3mm) package layout compatibility with high-current PCB routing.

Technical Context

The MP8774HGQ-P uses constant-on-time (COT) control to achieve sub-100ns load transient recovery without external compensation, maintaining stable regulation across 0.6V–12V output range via FB resistor divider. Its valley-current limiting and hiccup-mode OCP respond to sustained overloads by cycling soft-start rather than latching off.

Internal bootstrap charging supports high-side gate drive up to 18V input, with BST UVLO (1.7V rising, 150mV hysteresis) and dedicated VCC LDO (3.4V, ±3% load regulation). PG asserts after 50μs delay when VFB reaches 90% of 600mV reference, and deasserts on UV (80% VREF), OV (120% VREF), OTP, or SCP events.

Key Specifications

Pinout & Package

MP8774HGQ-P is housed in a thermally enhanced QFN-16 package (3mm × 3mm, 0.5mm pitch) with exposed thermal pad (PGND-connected) for efficient heat dissipation in high-current applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP8774HGQ-P, MP8772HGQ-Z trades current capacity for lower cost in lighter loads, while TPS546D24RQFT adds digital configurability at the expense of design simplicity, higher component count, and longer power-up sequencing latency.

Availability

MP8774HGQ-P is available at Aetrix Electronics and suitable for security cameras, AP routers, and digital set-top boxes requiring stable component supply with full production lifecycle support through 2030.

Supply support for MP8774HGQ-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 20 years of expertise in DC/DC conversion, motor drivers, and LED lighting solutions.

The MP8774H product line targets high-current, space-constrained point-of-load applications in networking, surveillance, and consumer electronics - emphasizing integration, thermal robustness, and ease of layout with minimal external components.

FAQ

What is the minimum output voltage supported by MP8774HGQ-P?

The MP8774HGQ-P supports output voltages down to 0.6V, set by the internal 600mV feedback reference and external resistor divider. This enables direct regulation for modern low-voltage processors and FPGAs without additional scaling circuitry.

Does MP8774HGQ-P support forced PWM mode?

No - MP8774HGQ-P operates in automatic PFM/PWM transition mode only. It enters skip-mode (PFM) under light loads to improve efficiency but does not offer a pin or register to force continuous PWM operation across all load conditions.

How is thermal performance affected by PCB layout?

Thermal resistance drops from θJA = 38°C/W (4-layer EVB) to >50°C/W on 2-layer boards without thermal vias. The exposed PGND pad must be soldered to ≥4 internal ground planes using ≥9 thermal vias (0.3mm diameter) to maintain TJ < 125°C at 12A/12V input.

Can MP8774HGQ-P be used with ceramic output capacitors only?

Yes - the internal COT compensation is optimized for ceramic output capacitors. No additional ESR network or external compensation is required, simplifying design and reducing bill-of-materials cost compared to voltage-mode controllers.

What happens during a short-circuit event?

Upon short-circuit detection, MP8774HGQ-P enters hiccup mode: it disables switching, discharges the SS capacitor, waits ~10ms, then attempts soft-start again. This cycle repeats until fault clears, preventing thermal runaway while allowing autonomous recovery.

Is the EN pin 18V-tolerant?

Yes - EN accepts up to 18V directly, matching the VIN range. With internal 3.3MΩ pull-down, it supports direct connection to VIN for simple enable control without level-shifting circuitry.

What is the maximum recommended BST capacitor value?

MPS recommends 0.1µF ceramic (X7R, 16V rating) between BST and SW. Larger values increase charge time and may delay startup; smaller values risk insufficient gate drive under heavy load or high VIN conditions.