Monolithic Power Systems Inc. MPQ8632GV-15-Z

Overview

MPQ8632GV-15-Z 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 for ultrafast transient response, and non-latch over-voltage protection. It operates from 2.5V–18V input (with external 5V bias) or 4.5V–18V (internal bias), targeting high-density power rails in telecom base stations and server VRMs.

For engineers reviewing the MPQ8632GV-15-Z datasheet, MPQ8632GV-15-Z pinout, MPQ8632GV-15-Z application, or MPQ8632GV-15-Z equivalent, key selection criteria include its 5×4mm QFN package with 29-pin SW/PGND layout, 9.9mΩ high-side R_DS(ON), programmable 200kHz–1MHz switching frequency, and integrated thermal shutdown with 150°C trip point.

Technical Context

The MPQ8632GV-15-Z implements adaptive COT control without an external oscillator, using feed-forward compensation via the FREQ pin to maintain stable switching frequency across input voltage variation. Its internal architecture integrates matched high- and low-side MOSFETs with 9.9mΩ/3.0mΩ R_DS(ON) at 25°C and a dedicated current modulator enabling skip-mode operation below critical load.

It features dual-path ground separation (AGND for analog reference, PGND for power return), bootstrap gate drive for high-side switching, and a precision 0.611V reference (±0.5% over 0°C–70°C). The IC supports pre-bias startup and provides open-drain power-good signaling with 2.5ms delay and 80–94% V_FB thresholds.

Key Specifications

Pinout & Package

MPQ8632GV-15-Z uses a thermally enhanced 29-pin QFN package (5mm × 4mm, 0.5mm pitch) with exposed thermal pad. Pin count and layout differ from the 16-pin 3×4mm variants to accommodate higher-current power delivery: multiple parallel SW and PGND pins reduce trace resistance and improve 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-Z offers optimized thermal resistance (θ_JA = 38°C/W) for 15A continuous operation without derating, while RTQ2132BGQW trades transient response and feature set for miniaturization-making it suitable only where strict size limits override dynamic performance needs.

Availability

MPQ8632GV-15-Z is available at Aetrix Electronics and suitable for telecom infrastructure, server power delivery, and broadcast video equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MPQ8632GV-15-Z 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-current, high-efficiency point-of-load conversion in space-constrained systems, emphasizing thermal robustness, fast transient response, and seamless scalability from 4A to 20A within shared footprint families.

FAQ

What is the minimum recommended input voltage for MPQ8632GV-15-Z when using internal bias?

The minimum input voltage is 4.5V when relying on the internal 4.8V VCC LDO. Below this, the internal bias cannot sustain control circuit operation. With external 5V applied to VCC, the input range extends down to 2.5V, enabling compatibility with single-cell Li-ion or 3.3V intermediate rails.

How does the non-latch OVP function differ from latch-off OVP in other MPQ8632 variants?

MPQ8632GV-15-Z uses non-latch OVP: if output voltage exceeds 120% V_REF, the IC disables switching and auto-restarts after the fault clears. In contrast, latch-off variants (e.g., MPQ8632GLE-10) require EN pin cycling to reset. Non-latch behavior prevents system downtime during transient overvoltage events like load dump.

Can MPQ8632GV-15-Z operate without an external soft-start capacitor?

No. The SS pin requires an external capacitor to control startup dV/dt. Omitting it causes uncontrolled inrush current, potentially damaging input capacitors or triggering upstream current limits. Typical values range from 1nF to 10nF, setting soft-start time between 1ms and 10ms based on ISS = 20μA.

What is the purpose of the multiple SW and PGND pins in the 29-pin QFN package?

The eight SW pins (15–18, 25–29) and ten PGND pins (10–14, 19–23) distribute 15A peak current across multiple bond wires and PCB traces, reducing current density, parasitic inductance, and thermal resistance. This layout lowers voltage spikes during switching and improves thermal dissipation versus single-pin configurations.

Is the MPQ8632GV-15-Z compatible with ceramic output capacitors having zero ESR?

Yes, but stability requires careful attention. The COT control loop relies on output capacitor ESR to shape the feedback ramp. With near-zero-ESR ceramics, adding a small RC network (e.g., 10mΩ + 10nF) in series with the FB divider's bottom resistor restores phase margin and prevents subharmonic oscillation.

What thermal derating applies above 25°C ambient temperature?

Derating follows θ_JA = 38°C/W. At 70°C ambient, maximum continuous power dissipation drops to (150°C − 70°C)/38°C/W = 2.1W. For 15A output, this corresponds to ~140mV total voltage drop (R_DS(ON) + PCB losses), requiring careful layout and airflow to avoid thermal shutdown.

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

No. It lacks an external clock sync input. Frequency is set solely by the resistor on the FREQ pin and varies only with input voltage due to feed-forward compensation. For synchronized multi-phase designs, use discrete timing controllers or select MPS parts with SYNC pins (e.g., MP296x series).