Monolithic Power Systems Inc. MPQ8632GV-20-P

Overview

MPQ8632GV-20-P from Monolithic Power Systems is a high-efficiency, 18V-input synchronous step-down DC/DC converter delivering up to 20A output current with 0.611V–13V adjustable output voltage, Constant-On-Time (COT) control for ultrafast transient response, and integrated 9.9mΩ high-side / 2.4mΩ low-side MOSFETs in a 29-pin QFN 5mm×4mm package. It targets high-density power rails in telecom base stations and server VRMs.

For engineers reviewing the MPQ8632GV-20-P datasheet, MPQ8632GV-20-P pinout, MPQ8632GV-20-P application, or MPQ8632GV-20-P equivalent, key selection factors include its non-latch OVP mode, programmable 200kHz–1MHz switching frequency via external resistor, 0.5% reference voltage accuracy over –40°C to +125°C, thermal shutdown at 150°C, and support for pre-bias startup and soft-start timing control.

Technical Context

The MPQ8632GV-20-P implements adaptive COT control without an external oscillator, using input-voltage feedforward through the FREQ pin to maintain stable switching frequency across 4.5V–18V input range. Its internal architecture integrates dual power MOSFETs, bootstrap gate driver, 4.8V VCC LDO, and open-drain power-good signaling with 2.5ms delay.

It operates in PWM mode under continuous conduction (CCM) above critical load (~10A at 12V_IN/1V_OUT) and transitions to skip-mode DCM at light loads, reducing switching losses while maintaining regulation via current-modulator–controlled valley current limiting down to –4.6A (negative inductor current clamping).

Key Specifications

Pinout & Package

MPQ8632GV-20-P uses a thermally enhanced 29-pin QFN package (5mm × 4mm, 0.5mm pitch), with exposed thermal pad for PCB heat sinking. Pin count and layout differ from the 16-pin 3mm×4mm variant to accommodate higher-current SW and PGND terminals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ8632GVE-15, the MPQ8632GV-20-P delivers 33% higher current in the same footprint with lower R_DS(ON), while the TPS546B24A adds digital control complexity and external component overhead at the expense of integration and transient speed.

Availability

MPQ8632GV-20-P is available at Aetrix Electronics and suitable for telecom base stations, server VRMs, and distributed power systems requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.

Supply support for MPQ8632GV-20-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 over two decades of expertise in DC/DC conversion, motor drivers, and LED lighting controllers.

The MPQ8632 family was designed specifically for high-current, high-density point-of-load applications in networking, computing, and industrial equipment-emphasizing integration, thermal robustness, and ease of use without sacrificing efficiency or transient response.

FAQ

What is the recommended input capacitor configuration for MPQ8632GV-20-P at 20A output?

Use ≥4× 22μF X5R/X7R ceramic capacitors (0805 or larger) placed within 3mm of the IN and PGND pins, plus one 100μF POSCAP or polymer capacitor near the input connector. Total effective capacitance should exceed 100μF with ESR <5mΩ to suppress high-frequency ripple and sustain 20A pulsed current without VIN droop.

Does MPQ8632GV-20-P support forced continuous conduction mode (FCCM)?

No. MPQ8632GV-20-P operates exclusively in adaptive COT mode with automatic transition between PWM (CCM) and skip-mode (DCM). It lacks a MODE pin or external control to force CCM at light loads; efficiency optimization relies on natural frequency reduction below critical current.

How is thermal performance validated for the 29-pin QFN package?

Thermal resistance is characterized per JESD51-7 on a 4-layer PCB: θ_JA = 38°C/W and θ_JC = 6°C/W. Full 20A operation requires the exposed thermal pad to be soldered to ≥4cm² of inner-layer copper pour with ≥6 thermal vias (0.3mm diameter) connecting to solid ground planes.

Can the MPQ8632GV-20-P be synchronized to an external clock?

No. The MPQ8632GV-20-P uses self-timed Constant-On-Time control and has no external clock input or synchronization pin. Frequency is set solely by the resistor on the FREQ pin and input voltage feedforward; it cannot be locked to an external master clock.

What is the minimum output capacitor ESR requirement for stability?

Stability does not depend on output capacitor ESR due to COT architecture. However, for optimal light-load efficiency and jitter suppression, use ceramic capacitors with ESR <5mΩ. If large-ESR POSCAPs are used, select ESR per equation: ESR ≤ 0.7 × T_ON / (2 × C_OUT) to avoid VFB slope degradation.

Is the MPQ8632GV-20-P RoHS-compliant and halogen-free?

Yes. MPQ8632GV-20-P is lead-free and fully compliant with EU RoHS Directive 2011/65/EU and JEDEC JS709B. It contains no brominated flame retardants (BFRs), antimony trioxide, or other halogenated compounds per MPS green policy documentation.

How does the non-latch OVP behave during a sustained overvoltage event?

When FB exceeds 120% V_REF, the high-side MOSFET shuts off and the low-side remains on to discharge the output. After the fault clears and V_FB drops below 117% V_REF, the device automatically resumes normal operation without requiring EN toggle or power cycle.