Monolithic Power Systems Inc. MPQ8632GL-4-P

Overview

MPQ8632GL-4-P from Monolithic Power Systems is a fully integrated 4A synchronous step-down DC/DC converter with Constant-On-Time (COT) control, operating from 2.5V–18V input and delivering adjustable output from 0.611V to 13V. It features non-latch over-voltage protection, 16-pin 3mm×4mm QFN package, and integrated high- and low-side MOSFETs with 28mΩ/16.4mΩ R_DS(ON) at 25°C - deployed in telecom power rails and server point-of-load regulation.

For engineers reviewing the MPQ8632GL-4-P datasheet, MPQ8632GL-4-P pinout, MPQ8632GL-4-P application, or MPQ8632GL-4-P equivalent, key selection criteria include its programmable 200kHz–1MHz switching frequency, 0.5% reference voltage accuracy over 0°C–70°C, soft-start timing via external capacitor, and thermal shutdown at 150°C - all critical for stable POL design under dynamic load transients.

Technical Context

The MPQ8632GL-4-P implements adaptive COT control with feed-forward compensation via the FREQ pin, enabling near-constant switching frequency across input voltage variation. Its internal 4.8V VCC LDO powers gate drivers, while bootstrap circuitry supports high-side N-channel MOSFET operation.

It operates in PWM mode under continuous conduction (CCM) and transitions to skip-mode DCM at light loads, using current modulation to clamp negative inductor current below –1mA. Protection includes non-latch OCP (11A valley limit), OVP (120% V_FB threshold), and thermal shutdown with 25°C hysteresis.

Key Specifications

Pinout & Package

MPQ8632GL-4-P uses a thermally enhanced 16-pin QFN (3mm × 4mm, 0.5mm pitch) with exposed thermal pad. Pin numbering follows standard top-view orientation per MPS datasheet Rev.1.24.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ8632GL-4-P, MPQ8632GLE-4 offers identical performance in volume production, while TPS54340DDAR trades COT speed and integration for wider VIN range - making the MPQ8632GL-4-P optimal for space-constrained 12V/5V POL where transient response and layout simplicity are critical.

Availability

MPQ8632GL-4-P is available at Aetrix Electronics and suitable for telecom infrastructure, server power delivery, flat-panel display logic rails, and distributed industrial control requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for MPQ8632GL-4-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 MPQ8632 family targets high-density, high-efficiency DC/DC conversion in space-constrained applications such as networking equipment, servers, and consumer displays - emphasizing integration, thermal robustness, and ease of use.

FAQ

What is the minimum input voltage supported by MPQ8632GL-4-P?

The MPQ8632GL-4-P supports 2.5V minimum input when an external 5V bias is applied to the VCC pin, bypassing the internal LDO. With internal bias only, the minimum input is 4.5V due to VCC UVLO requirements. This dual-input capability enables flexibility across battery-powered and fixed-rail systems.

How does the non-latch OVP function differ from latch-off variants like MPQ8632GLE-10?

MPQ8632GL-4-P uses non-latch OVP: when output exceeds 120% V_REF, it disables switching temporarily but resumes automatically once the fault clears. In contrast, MPQ8632GLE-10 (latch-off version) holds shutdown until EN is cycled. Non-latch behavior avoids system resets in transient-overvoltage scenarios like hot-swap events.

Can MPQ8632GL-4-P operate with pre-biased output capacitors?

Yes - MPQ8632GL-4-P supports pre-bias start-up. Its control architecture prevents reverse current flow into the output during startup, allowing safe activation into an already charged rail (e.g., during hot-plug or rail sequencing). No external diode or circuitry is required.

What is the recommended layout practice for the BST and SW pins?

Place a 0.1μF X7R ceramic capacitor directly between BST and SW pins with minimal trace length (<2mm) and no vias. Use multiple thermal vias under the exposed pad connected to a solid PGND plane. Keep SW traces wide (>0.5mm) and avoid routing near sensitive analog nodes (FB, SS, AGND) to suppress EMI coupling.

Is the 0.611V reference voltage affected by temperature or load?

The reference voltage is specified as 0.611V ±0.003V over 0°C–70°C junction temperature and remains stable across load (0–4A); full datasheet characterization shows ±0.015V deviation over –40°C to +125°C. Load regulation contributes <±0.1% error, making it suitable for precision POL applications.

Does MPQ8632GL-4-P require external compensation components?

No - MPQ8632GL-4-P uses Constant-On-Time (COT) control with built-in feed-forward and adaptive dead-time, eliminating the need for external Type-II or Type-III compensation networks. Only the feedback resistor divider, soft-start capacitor, and frequency-setting resistor are required for basic operation.

What thermal derating applies above 25°C ambient?

With θ_JA = 46°C/W on a standard 4-layer board, maximum continuous output current drops linearly: at 60°C ambient, derated current is ~3.1A; at 85°C, ~2.2A. Derating assumes 1-inch² 2oz copper thermal pad under the QFN; doubling copper area improves current capacity by ~15%.