Monolithic Power Systems Inc. MPQ8633AGL-P

Overview

MPQ8633AGL-P from Monolithic Power Systems is a fully integrated 16V, 12A synchronous step-down converter with adjustable current limit (16A max), programmable switching frequency (600/800/1000 kHz), and voltage tracking capability. It employs internal constant-on-time (COT) control for ultrafast transient response and supports differential remote sensing for precise load regulation in high-current PoL applications such as server VRMs and GPU power rails.

For engineers reviewing the MPQ8633AGL-P datasheet, MPQ8633AGL-P pinout, MPQ8633AGL-P application, or MPQ8633AGL-P equivalent, key selection criteria include its QFN-21 (3mm × 4mm) package, 0.6V–5.5V adjustable output, 0.6V reference accuracy (±0.5% over 0°C–70°C), and integrated protection features including non-latch OCP, OVP, UVP, and thermal shutdown.

Technical Context

The MPQ8633AGL-P implements an adaptive internal ramp COT control architecture that maintains stability across input (4V–16V) and output (0.6V–5.5V) ranges without requiring external compensation. Its valley-current sensing via CS pin enables cycle-by-cycle positive overcurrent protection with programmable trip point set by an external resistor.

It integrates dual MOSFETs with R_DS(ON) of 13.3 mΩ (HS) and 3.8 mΩ (LS) at 25°C, enabling high-efficiency operation up to 12A continuous output. The TRK/REF pin provides analog voltage tracking with 0.3V–1.4V input range and supports pre-bias start-up and controlled output discharge via internal 80Ω discharge FET.

Key Specifications

Pinout & Package

MPQ8633AGL-P is housed in a thermally enhanced QFN-21 package (3mm × 4mm, 0.5mm pitch) with exposed thermal pad (PGND-connected) and 21 copper terminals. Pin 1 is marked with dot; top-side marking includes "MPQ8633AGL" followed by date and lot code.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ8633DGL-Z, MPQ8633AGL-P delivers superior thermal performance and design flexibility via the dedicated BST pin and QFN-21 layout; versus TPS546B24RVFT, it offers analog voltage tracking and smaller form factor at the expense of digital configurability.

Availability

MPQ8633AGL-P is available at Aetrix Electronics and suitable for telecom base stations, server VRMs, and industrial FPGA power systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MPQ8633AGL-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 MPQ8633A product line targets high-current, high-efficiency point-of-load conversion in datacenter, networking, and computing applications where thermal density, transient response, and analog simplicity are critical.

FAQ

What is the minimum output voltage achievable with MPQ8633AGL-P?

The MPQ8633AGL-P supports output voltages down to 0.6V, set by its internal 600mV reference voltage and external resistor divider on the FB pin. This minimum is guaranteed across -40°C to +125°C junction temperature with ±1% accuracy, making it suitable for modern low-voltage ASIC and FPGA core rails.

How does the TRK/REF pin enable voltage tracking functionality?

The TRK/REF pin accepts an external analog voltage (0.3V–1.4V) that directly replaces the internal 600mV reference. When active, the FB node follows this input precisely, enabling synchronized ramp-up with another supply-critical for multi-rail systems like DDR memory interfaces or FPGA core/I/O sequencing.

Can MPQ8633AGL-P operate with ceramic output capacitors only?

Yes. Its adaptive COT control architecture is explicitly designed for stability with zero-ESR ceramic capacitors. The internal ramp compensation eliminates the need for electrolytic or tantalum output caps, reducing board area and improving reliability in high-reliability applications.

What is the purpose of the CS pin and how is current limit configured?

The CS pin senses mirrored inductor current during the low-side FET conduction phase. A resistor (R_CS) from CS to AGND sets the OCP threshold: V_CS = I_OUT × 20 µA/A. At 1.2V threshold, a 75kΩ resistor configures 16A current limit, enabling precise, adjustable protection without external current-sense resistors.

Does MPQ8633AGL-P support forced continuous conduction mode (CCM)?

Yes. By configuring the MODE pin with specific resistor values (e.g., 30.1kΩ to AGND), the device operates in forced CCM across all load conditions-including light loads-eliminating audible noise and ensuring constant switching frequency for EMI filtering predictability.

How does the PGOOD signal behave during input supply failure?

When VIN drops below UVLO threshold (~2.4V), the internal regulator fails and PGOOD is actively clamped to ~0.7V regardless of external pull-up voltage. This unambiguous low-level assertion enables immediate system shutdown or fail-safe state transition without relying on external supervision circuits.

What thermal metrics define the QFN-21 package's cooling capability?

The MPQ8633AGL-P QFN-21 package has θ_JB = 9°C/W (junction-to-board) and θ_{JC_TOP} = 21°C/W (junction-to-case top). These values assume proper PCB layout: 4-layer board with 2oz copper, thermal vias under the exposed PGND pad, and adequate copper pour-enabling full 12A operation at +85°C ambient.