Monolithic Power Systems Inc. MPQ8632GLE-8-P

Overview

MPQ8632GLE-8-P from Monolithic Power Systems is an 8A synchronous step-down DC/DC converter with 2.5V–18V input range, non-latch over-voltage protection, and Constant-On-Time (COT) control for fast transient response. It integrates high- and low-side MOSFETs (28 mΩ / 15.3 mΩ typical R_DS(ON)), supports programmable 200kHz–1MHz switching frequency via external resistor, and delivers regulated output from 0.611V to 13V in telecom power rails and server VRMs.

For engineers reviewing the MPQ8632GLE-8-P datasheet, MPQ8632GLE-8-P pinout, MPQ8632GLE-8-P application, or MPQ8632GLE-8-P equivalent, key selection criteria include its QFN-3×4mm footprint compatibility with 4A–12A variants, 0.5% reference voltage accuracy over –40°C to +125°C, soft-start programmability, and open-drain power-good signaling for system sequencing.

Technical Context

The MPQ8632GLE-8-P implements adaptive COT control without an external compensation network, using feed-forward line regulation via the FREQ pin to maintain stable switching frequency across input voltage variation. Its internal 4.8V VCC LDO powers gate drivers and control logic, while bootstrap circuitry enables high-side N-channel MOSFET operation.

It operates in continuous-conduction mode (CCM) up to full 8A load and transitions to discontinuous-conduction mode (DCM) at light loads, where valley-current limiting and tri-state low-side driver reduce switching losses. Protection includes non-latch over-current (10A–12A peak), thermal shutdown at 150°C, and under-voltage lockout with 4.1V default threshold.

Key Specifications

Pinout & Package

MPQ8632GLE-8-P is housed in a thermally enhanced 16-pin QFN package (3mm × 4mm, 0.5mm pitch) with exposed thermal pad. Pin 1 is EN (Enable), and pins 9/14 are IN (input power); PGND occupies pins 10–13 for low-impedance ground return; SW (switch node) connects to pins 15/16 for high-current inductor routing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ8632GLE-6 and MPQ8632GLE-10, the MPQ8632GLE-8-P offers optimal balance of current rating, thermal performance, and footprint compatibility-enabling drop-in replacement within the 4A–12A scalable family while avoiding overdesign or insufficient headroom.

Availability

MPQ8632GLE-8-P is available at Aetrix Electronics and suitable for telecom base station power, server point-of-load conversion, and industrial edge AI accelerators requiring stable component supply with guaranteed long-term availability.

Supply support for MPQ8632GLE-8-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 infrastructure equipment, emphasizing scalability, thermal robustness, and simplified system integration through integrated power stages and adaptive control.

FAQ

What is the recommended input capacitor for MPQ8632GLE-8-P?

A minimum 47µF X7R ceramic capacitor placed within 3mm of the IN and PGND pins is required, supplemented by a 10µF bulk capacitor. Layout must use wide copper pours and ≥4 vias to PGND thermal pad to handle 8A ripple current and minimize impedance.

Does MPQ8632GLE-8-P support forced PWM mode?

No-it operates exclusively in adaptive COT mode with automatic transition between CCM and DCM. There is no pin or register to force continuous switching; light-load efficiency is optimized via skip-mode and tri-state low-side driver activation.

How is the over-voltage protection threshold configured?

OVP is fixed at 130% of the nominal output voltage (i.e., 1.3 × V_REF × [1 + R_top/R_bottom]) and cannot be adjusted externally. The non-latch behavior means the device resumes normal operation after V_OUT falls below the OVP release threshold.

Can MPQ8632GLE-8-P be used with an external 5V bias instead of internal VCC?

Yes-tying 5V to the VCC pin disables the internal 4.8V LDO and allows operation down to 2.5V input. This configuration reduces quiescent current and improves efficiency at low VIN, but requires clean, well-decoupled 5V bias.

What is the maximum allowable PCB temperature rise for thermal pad soldering?

The QFN-3×4mm package supports standard lead-free reflow profiles with peak temperature ≤260°C for ≤30 seconds. Thermal pad must be soldered with ≥80% coverage and ≥6 thermal vias (0.3mm diameter) to inner ground planes to achieve θ_JA ≤46°C/W.

Is the soft-start time adjustable independently of output voltage?

Yes-soft-start time is set solely by the capacitor value on the SS pin (T_SS ≈ 20µA × C_SS / 0.611V) and is independent of output voltage setting. A 47nF capacitor yields ~1.5ms ramp time for a 1.2V output.

Does MPQ8632GLE-8-P require a minimum load for regulation stability?

No-adaptive COT control maintains regulation from zero load to full 8A. The current modulator in DCM mode actively controls valley current, eliminating need for minimum load resistors or dummy loads.