Monolithic Power Systems Inc. MPQ8632GVE-20-P

Overview

MPQ8632GVE-20-P from Monolithic Power Systems is a fully integrated 20A synchronous step-down DC/DC converter with 2.5V–18V input range, Constant-On-Time (COT) control, 0.611V–13V adjustable output, non-latch over-voltage protection, and 9.9mΩ high-side R_DS(ON). It delivers high efficiency in telecom base stations and server power rails where compact 5mm×4mm QFN packaging and fast transient response are critical.

For engineers reviewing the MPQ8632GVE-20-P datasheet, MPQ8632GVE-20-P pinout, MPQ8632GVE-20-P application, or MPQ8632GVE-20-P equivalent, key selection criteria include verified 20A continuous output capability, thermal shutdown at 150°C, programmable 200kHz–1MHz switching frequency via FREQ pin resistor, and compatibility with pre-bias startup and soft-start timing control.

Technical Context

The MPQ8632GVE-20-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 power stage integrates matched high- and low-side MOSFETs optimized for 20A operation with 9.9mΩ/2.4mΩ R_DS(ON) at 25°C.

It operates in PWM mode under heavy load (CCM) and transitions to skip-mode DCM at light load, achieving high efficiency across 0.01A–20A output current. Protection includes non-latch OCP with 20A/25A/30A valley current limit thresholds, OVP at 130% V_FB, and thermal shutdown with 25°C hysteresis.

Key Specifications

Pinout & Package

MPQ8632GVE-20-P uses a thermally enhanced 29-pin QFN package (5mm × 4mm, 0.5mm pitch) with multiple parallel SW and PGND pins to minimize parasitic inductance and thermal resistance. The layout separates analog (AGND, FB, SS) and power (SW, IN, PGND) domains to suppress noise coupling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ8632GVE-15, the GVE-20-P provides 33% higher current capacity and lower conduction loss at full load, justifying its use in thermally demanding 20A rails; versus MPQ8632HGLE-10, it trades smaller footprint for significantly higher current, non-latch protection, and superior thermal performance in shared 5×4mm layouts.

Availability

MPQ8632GVE-20-P is available at Aetrix Electronics and suitable for telecom infrastructure, server power delivery, and distributed power systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MPQ8632GVE-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 and power management.

The MPQ8632 family targets high-density, high-efficiency point-of-load applications in networking, computing, and industrial systems-designed to replace multi-chip discrete solutions with fully integrated, thermally optimized buck regulators.

FAQ

What is the minimum recommended input voltage for MPQ8632GVE-20-P with internal bias?

The MPQ8632GVE-20-P requires a minimum 4.5V input when using internal VCC bias. If an external 5V bias is supplied to the VCC pin, the input voltage can be reduced to 2.5V. This dual-bias capability allows flexibility in system-level power sequencing and low-voltage operation scenarios.

How does the FREQ pin set switching frequency, and what resistor value yields 500kHz?

The FREQ pin uses a resistor (R_FREQ) between FREQ and IN to program ON-time per T_ON = 0.4 × V_IN / R_FREQ (kΩ) × 1000 ns. For 500kHz at V_IN = 12V, R_FREQ ≈ 243kΩ. The actual frequency remains stable across VIN variation due to feed-forward compensation built into the COT architecture.

Can MPQ8632GVE-20-P operate with a pre-biased output voltage?

Yes. The MPQ8632GVE-20-P supports pre-bias startup: it disables the low-side MOSFET during initial turn-on to prevent reverse current flow into a pre-charged output capacitor. This avoids output voltage overshoot and protects downstream components during hot-swap or multi-rail sequencing.

What is the thermal resistance (θ_JA) of the 29-pin QFN package, and how is it measured?

The MPQ8632GVE-20-P has θ_JA = 38°C/W, measured per JEDEC standard JESD51-7 on a 4-layer PCB with 2oz copper, 1in² exposed pad soldered to internal ground planes. This value assumes optimal thermal vias (≥9) under the exposed pad and proper copper pour on all layers.

Does MPQ8632GVE-20-P support output voltage tracking during power-up?

No. The MPQ8632GVE-20-P does not include dedicated voltage tracking functionality. Output voltage follows the soft-start ramp defined by the SS capacitor. For coordinated multi-rail tracking, external circuitry (e.g., resistive dividers tied to a master SS node) is required.

What is the maximum allowable output voltage, and how is it set?

The maximum output voltage is 13V, set by the feedback resistor divider: V_OUT = 0.611V × (1 + R1/R2). To achieve 13V, R1/R2 ≈ 20.25. The FB pin's 100nA input bias current introduces negligible error (<0.1%) when R1+R2 ≤ 200kΩ.

Is the PG (Power Good) signal active-high or open-drain, and what pull-up is recommended?

The PG pin is open-drain. A 100kΩ pull-up resistor to a stable voltage (e.g., 3.3V or 5V) is recommended. When V_OUT reaches ≥90% of nominal, PG pulls low after a 2.5ms delay; otherwise, it remains high-impedance. A 10nF capacitor from PG to GND is advised if pull-up <100kΩ to reduce noise sensitivity.