Monolithic Power Systems Inc. MPQ8632GV-15-P

Overview

MPQ8632GV-15-P from Monolithic Power Systems is a high-efficiency, 18V-input synchronous step-down DC/DC converter delivering up to 15A output current with 0.611V–13V adjustable output voltage, Constant-On-Time (COT) control, and non-latch over-voltage protection. It integrates high- and low-side MOSFETs in a thermally enhanced 5mm×4mm QFN package and targets point-of-load regulation in telecom base stations and server power rails.

For engineers reviewing the MPQ8632GV-15-P datasheet, MPQ8632GV-15-P pinout, MPQ8632GV-15-P application, or MPQ8632GV-15-P equivalent, key selection criteria include its 9.9mΩ high-side R_DS(ON), programmable 200kHz–1MHz switching frequency, 0.5% reference voltage accuracy over –40°C to +125°C, and integrated thermal shutdown with 150°C trip point.

Technical Context

The MPQ8632GV-15-P implements adaptive COT control with feed-forward compensation via the FREQ pin, enabling ultrafast transient response without external loop compensation. Its internal 4.8V VCC LDO powers gate drivers, while bootstrap circuitry supports high-side MOSFET operation across the full 4.5V–18V input range (or 2.5V–18V with external 5V bias).

It features dual-stage current limiting: valley-current OCP for stable light-load operation and peak-current limit for overload protection. The open-drain PG signal asserts after 2.5ms delay when FB reaches ≥91% of nominal, and the device enters thermal shutdown at 150°C with 25°C hysteresis.

Key Specifications

Pinout & Package

MPQ8632GV-15-P uses a 29-pin QFN package (5mm × 4mm, 0.4mm pitch) with exposed thermal pad. Pin count and layout differ from the 16-pin 3mm×4mm variants to accommodate higher-current power stages and improved thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ8632GVE-20, the MPQ8632GV-15-P trades 5A current headroom for optimized cost and thermal performance at typical 12–15A loads; versus RTQ2132BGQW, it delivers superior light-load efficiency via skip-mode operation and eliminates compensation design effort through COT architecture.

Availability

MPQ8632GV-15-P is available at Aetrix Electronics and suitable for telecom base stations, server power supplies, flat panel displays, and distributed power systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MPQ8632GV-15-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 is part of MPS's high-current DC/DC converter product line, engineered specifically for high-efficiency, low-profile point-of-load regulation in space-constrained infrastructure equipment where thermal performance and transient response are critical.

FAQ

What is the maximum recommended PCB copper weight and thermal pad layout for MPQ8632GV-15-P?

The device requires a minimum 2oz copper thermal pad connected to all 10 PGND pins and the exposed die paddle. Use ≥8 thermal vias (0.3mm diameter, 0.6mm pitch) filled with solder to inner ground plane. Avoid splitting the pad - maintain solid copper under the entire 5mm×4mm footprint per MPS AN-107 layout guidelines.

Can MPQ8632GV-15-P operate with an input voltage below 4.5V?

Yes - when a clean 5V external bias is applied to the VCC pin, the input voltage range extends down to 2.5V. This configuration disables the internal 4.8V LDO and allows operation from low-voltage intermediate buses such as 3.3V or battery-backed rails, provided the 5V bias remains stable.

How does the non-latch OVP behavior affect system-level fault handling?

When output voltage exceeds 120% of V_REF, the device halts switching and holds the output in regulation until the fault clears; then it automatically resumes normal operation without requiring an EN toggle or power cycle. This enables graceful recovery from transient overvoltage events like load dump or feedback resistor drift.

Is the MPQ8632GV-15-P pin-compatible with earlier MPQ8632GLE-x variants?

No - MPQ8632GV-15-P uses a 29-pin 5mm×4mm QFN package with different pin count, spacing, and power pin allocation versus the 16-pin 3mm×4mm MPQ8632GLE-x series. Layout, thermal pad, and SW/PGND routing must be redesigned; only the functional interface (EN, FB, SS, PG, etc.) remains consistent.

What is the minimum output capacitance required for stable operation at 15A?

MPS specifies ≥470μF total output capacitance with ≤5mΩ ESR for 15A operation. Use ≥3× 220μF POSCAPs or polymer tantalum in parallel to meet ripple and transient response requirements; ceramic-only solutions require ≥10× 47μF X7R/X5R in low-ESL layout to avoid instability under heavy load steps.

Does the MPQ8632GV-15-P support synchronization to an external clock?

No - the device lacks an external clock sync input. Frequency is set solely by the resistor on the FREQ pin and stabilized via VIN feed-forward. For synchronized multi-phase designs, use discrete timing controllers or select MPS's MP2960 family, which supports external clock injection.

How is the soft-start time calculated for a given SS capacitor value?

Soft-start time (t_SS) ≈ C_SS × 611mV / 20μA, where C_SS is in farads and t_SS in seconds. For example, a 100nF capacitor yields ~3ms ramp time. The internal 20μA charging current is trimmed to ±25%, so final ramp time should be verified with oscilloscope measurement on the VOUT rail.