Monolithic Power Systems Inc. MPQ8633A-HGLE-P

Overview

MPQ8633A-HGLE-P from Monolithic Power Systems is a fully integrated, high-frequency synchronous step-down converter delivering up to 12A output current with input range 4V–16V, selectable 600/800/1000kHz switching frequency, adjustable current limit (1.15–1.25V threshold), and differential remote-sense feedback. It serves as the primary power stage in high-density telecom and server point-of-load (POL) applications requiring tight regulation and fast transient response.

For engineers reviewing the MPQ8633A-HGLE-P datasheet, MPQ8633A-HGLE-P pinout, MPQ8633A-HGLE-P application, or MPQ8633A-HGLE-P equivalent, key selection criteria include its adaptive COT control architecture, non-latch OCP with hiccup recovery, VOUT tracking capability via TRK/REF, pre-biased start-up support, and QFN-21 (3mm×4mm) thermal performance with θJB = 9°C/W.

Technical Context

The MPQ8633A-HGLE-P implements adaptive constant-on-time (COT) control with internal ramp compensation, enabling stable operation with zero-ESR MLCC output capacitors across full VIN (4–16V) and VOUT (0.6–5.5V) ranges. Its valley-current sensing uses an on-die current mirror (GCS = 20μA/A) referenced to the CS pin for cycle-by-cycle over-current protection.

Switching behavior is determined by MODE pin configuration: resistor values set both operating mode (FCCM or PSM) and fSW (600/800/1000kHz); TRK/REF enables voltage tracking or external reference input (0.3–1.4V), while dedicated RGND/FB pins support differential remote sensing for ±0.5% VREF accuracy over 0°C–70°C.

Key Specifications

Pinout & Package

MPQ8633A-HGLE-P is housed in a thermally enhanced QFN-21 package (3mm × 4mm, 0.5mm pitch) with exposed thermal pad (PGND-connected) and wettable flanks for automated optical inspection. The package supports θJB = 9°C/W and θJC_TOP = 21°C/W, enabling high-power density designs without heatsinks in moderate airflow.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck converter applications.

Compared with MPQ8633A-HGLE-P, the MPQ8633D-AEC1 adds automotive qualification without altering performance, while the RTQ2132B-QT trades feature richness for reduced BOM count and simplified stability tuning-making it viable only where MPQ8633A-HGLE-P's advanced control and sensing capabilities are unused.

Availability

MPQ8633A-HGLE-P is available at Aetrix Electronics and suitable for telecom POL supplies, server DDR memory rails, networking ASIC core supplies, and industrial edge AI accelerators requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for MPQ8633A-HGLE-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 innovation in DC-DC conversion, motor drivers, and LED lighting controllers.

The MPQ8633A product line targets high-density, high-efficiency point-of-load regulation in datacenter, telecom, and networking equipment-designed to replace multi-chip discrete solutions with single-package integration and superior thermal performance.

FAQ

What is the minimum recommended output capacitance for stable operation?

The MPQ8633A-HGLE-P is stable with zero-ESR ceramic capacitors; minimum recommended total COUT is 220μF using X7R/X5R dielectric MLCCs. Layout best practices require placing capacitors close to the SW and PGND pins, with parallel small-value (1–10μF) caps to suppress high-frequency ringing. Bulk capacitance may be supplemented with polymer tantalum if ripple current exceeds MLCC ratings.

How does the MODE pin resistor value affect both switching frequency and light-load mode?

The MODE pin resistor selects both fSW and light-load operation: 30.1kΩ to AGND configures FCCM at 800kHz, while 60.4kΩ selects FCCM at 1000kHz; pulling MODE to VCC selects PSM at 600kHz. Table 1 in the datasheet defines all nine valid combinations. Incorrect resistor values cause undefined behavior-including unstable regulation or failure to start.

Can the MPQ8633A-HGLE-P safely start into a pre-biased output voltage?

Yes-the device supports monotonic pre-biased start-up. When EN is asserted and VOUT is already present, the IC holds both MOSFETs off until TRK/REF exceeds the sensed FB voltage. If BST voltage drops below 2.3V during this phase, the LS-FET pulses briefly to recharge BST via VCC, minimizing discharge of the pre-biased rail.

What is the purpose of the RGND pin, and how should it be connected?

R-GND is the dedicated return path for the FB resistor divider's low-side node and enables true differential remote sensing. It must be connected directly to the load-side ground point-not to the main PGND plane-to cancel voltage drop across PCB traces. Shorting RGND to PGND disables remote sensing and reverts to single-point feedback.

Does the MPQ8633A-HGLE-P support output voltage tracking during power-up only, or continuously?

TRK/REF supports continuous analog tracking: when an external voltage (0.3–1.4V) is applied, VOUT dynamically follows it in real time-not just during start-up. This enables coordinated sequencing with other rails (e.g., VDDQ tracking VDD) and dynamic voltage scaling during operation, provided the TRK/REF source has sufficient drive strength (>42μA sink capability).

What happens during over-current fault recovery, and is it latch-off or auto-retry?

Upon detecting 31 consecutive OCP cycles or UVP, the MPQ8633A-HGLE-P enters hiccup mode: HS/LS-FETs latch off, TRK/REF discharges, and after ~11ms, it initiates soft-start again. If the fault persists, it repeats the cycle. Recovery is fully automatic-no external reset or EN toggle required-and resumes normal regulation once the fault clears.

Is the VCC pin internally powered, or does it require an external bias supply?

VCC is an internal 3.0V LDO output that powers gate drivers and control logic. It requires a ≥1μF X7R/X5R ceramic capacitor to AGND, placed adjacent to the pin. No external bias is needed unless VIN < 4V-in which case an external 3.3V supply can be applied to VCC to enable operation down to 2.7V VIN with external bias.