Monolithic Power Systems Inc. MP8772GQ-Z

Overview

MP8772GQ-Z from Monolithic Power Systems is a fully integrated 12A, 17V synchronous step-down DC/DC converter with constant-on-time (COT) control, internal 16mΩ/5.5mΩ MOSFETs, 700kHz fixed switching frequency, and integrated power-good (PG) and external soft-start functionality in a 3×3mm QFN-16 package. It delivers tight regulation for FPGA core rails and SoC power domains in security cameras and portable devices.

For engineers reviewing the MP8772GQ-Z datasheet, MP8772GQ-Z pinout, MP8772GQ-Z application, or MP8772GQ-Z equivalent, key selection criteria include its 3V–17V input range, 0.6V adjustable output, pre-biased start-up capability, hiccup-mode over-current protection, and thermal shutdown at 150°C - all critical for high-density embedded power designs requiring robust sequencing and transient response.

Technical Context

The MP8772GQ-Z employs constant-on-time (COT) control architecture to achieve fast load-transient response without external compensation, maintaining stable operation with ceramic output capacitors. Its valley-current-limit OCP and hiccup recovery mechanism provide fault resilience during sustained overload conditions.

Internal bootstrap charging supports high-side N-channel MOSFET drive, with BST UVLO (1.7V rising threshold) and integrated 3.4V VCC LDO powered from VIN across the full 3–17V range. PG output provides open-drain status signaling with 50µs delay and dual-threshold (90%/80% VFB) detection for undervoltage and overvoltage events.

Key Specifications

Pinout & Package

MP8772GQ-Z is housed in a thermally enhanced QFN-16 package (3mm × 3mm, 0.5mm pitch) with exposed thermal pad (Pin 9–13 PGND). The package supports >3W continuous dissipation on 4-layer PCBs per θJA = 38°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with RTQ2132BGQW and TPS546B24RVFR, the MP8772GQ-Z uniquely combines PG signaling, external soft-start adjustability, and COT control in a 3×3mm footprint - making it optimal for cost-sensitive, space-constrained embedded systems where analog reliability trumps digital configurability.

Availability

MP8772GQ-Z is available at Aetrix Electronics and suitable for security cameras, portable XDSL modems, digital set-top boxes, and flat-panel display logic rails requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for MP8772GQ-Z 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 MP8772 belongs to MPS's high-current monolithic buck converter product line, engineered specifically for compact, high-efficiency point-of-load regulation in imaging, networking, and consumer electronics where thermal density and transient response are critical.

FAQ

What is the minimum recommended soft-start capacitor value for MP8772GQ-Z?

The datasheet specifies avoiding SS capacitors below 4.7nF to ensure stable ramp behavior and prevent premature current-limit triggering. A 10nF capacitor yields ~1.4ms soft-start time using the 6µA internal current source and 0.6V reference, which is appropriate for most 12A applications with ≤1000µF output capacitance.

Can MP8772GQ-Z operate with an input voltage below 3V?

No. The absolute minimum operating input voltage is 3V per the Recommended Operating Conditions table. Below this, the internal VCC regulator cannot sustain bias, and the UVLO circuit disables the device. Input voltages down to 2.95V may cause intermittent startup but are not guaranteed or characterized.

How does the MP8772GQ-Z handle pre-biased outputs during start-up?

It supports monotonic pre-biased start-up by refreshing the BST capacitor and charging the SS node only after detecting valid output voltage at FB. This prevents reverse current flow through the low-side MOSFET, protecting downstream circuitry in hot-plug or redundant power scenarios.

What is the maximum allowable thermal pad solder coverage for QFN-16 package reliability?

MPS recommends ≥90% solder paste coverage on the exposed thermal pad (Pins 9–13) with ≥6 vias (0.3mm diameter) connecting to inner ground planes. Inadequate coverage increases θJA beyond 38°C/W, risking thermal shutdown under 12A continuous load at 70°C ambient.

Does MP8772GQ-Z support forced PWM mode to eliminate light-load frequency variation?

No. The device automatically transitions between CCM (PWM) and PFM (skip-mode) based on load current. There is no pin or register to force continuous switching; light-load efficiency is prioritized over spectral purity, making it unsuitable for noise-sensitive RF sections without additional filtering.

What failure modes trigger immediate PG deassertion without delay?

PG is pulled low immediately - bypassing the standard 50µs delay - during input under-voltage lockout (UVLO) or thermal shutdown (OTP). This enables instantaneous system-level fault response, such as initiating graceful shutdown in battery-powered edge devices before brownout corruption occurs.