Monolithic Power Systems Inc. MPQ8632GL-6-Z

Overview

MPQ8632GL-6-Z from Monolithic Power Systems is a fully integrated 6A synchronous step-down DC/DC converter with 2.5V–18V input range, Constant-On-Time (COT) control, non-latch over-voltage protection, and 0.611V–13V adjustable output voltage. It delivers high efficiency in telecom power supplies, server VRMs, and flat-panel display bias rails using internal MOSFETs with 19.6 mΩ high-side and 5.7 mΩ low-side R_DS(ON) at 25°C.

For engineers reviewing the MPQ8632GL-6-Z datasheet, MPQ8632GL-6-Z pinout, MPQ8632GL-6-Z application, or MPQ8632GL-6-Z equivalent, key selection criteria include its QFN-16 (3mm×4mm) footprint compatibility with 4A–12A variants, programmable 200kHz–1MHz switching frequency via external resistor, soft-start timing control, and open-drain power-good signal for system sequencing.

Technical Context

The MPQ8632GL-6-Z implements adaptive COT control with feed-forward compensation, enabling ultrafast transient response without external loop compensation components. Its one-shot on-time timer sets switching frequency based on input voltage and FREQ-pin resistor value, maintaining near-constant frequency across input variation.

It integrates dual N-channel MOSFETs, a 4.8V internal LDO for gate drive, bootstrap circuitry, and protection logic including non-latch OCP (11 A valley limit), OVP (120% V_FB threshold), and thermal shutdown at 150°C. The device operates in PWM mode under heavy load and transitions to skip-mode DCM at light load for improved efficiency.

Key Specifications

Pinout & Package

MPQ8632GL-6-Z uses a thermally enhanced 16-pin QFN package (3mm × 4mm, 0.5mm pitch) with exposed thermal pad. Pin layout matches MPQ8632GLE-4/6/8/10/12 variants, enabling footprint reuse across 4A–12A current ratings.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ8632GLE-4-Z, the MPQ8632GL-6-Z provides 50% higher current capacity in identical layout space; versus MPQ8632GLE-8-Z, it offers optimized R_DS(ON) and thermal performance for stable 6A operation without overdesign.

Availability

MPQ8632GL-6-Z is available at Aetrix Electronics and suitable for telecom power supplies, server point-of-load regulation, and flat-panel display bias rails requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for MPQ8632GL-6-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 emphasis on energy-efficient DC/DC conversion and motor control solutions.

The MPQ8632 family targets high-density, high-efficiency point-of-load applications in datacenter, telecom, and consumer electronics, where small footprint, fast transient response, and thermal resilience are critical.

FAQ

What is the minimum recommended input voltage for MPQ8632GL-6-Z when using internal bias?

The MPQ8632GL-6-Z requires a minimum 4.5V input when powered from its internal 4.8V VCC LDO. With external 5V bias applied to VCC, the input voltage can be reduced to 2.5V. This dual-bias capability supports flexible system-level power architecture design across varying intermediate bus voltages.

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

MPQ8632GL-6-Z uses non-latch OVP with a 120% V_FB threshold and automatic recovery after fault clearance. In contrast, MPQ8632GLE-10 (latch-off version) shuts down permanently until EN is cycled. Non-latch behavior avoids system resets during transient overvoltage events like hot-swap surges.

Can MPQ8632GL-6-Z operate in discontinuous conduction mode (DCM)?

Yes - the MPQ8632GL-6-Z automatically transitions from CCM to DCM at light load, entering skip-mode operation. This reduces switching losses and improves light-load efficiency by decreasing effective switching frequency while maintaining regulation via adaptive COT control.

What is the purpose of the AGND and PGND separation in the pinout?

AGND serves as the quiet reference for feedback, soft-start, and control circuitry, while PGND carries high di/dt return currents from the SW node and output inductor. Separating them minimizes noise coupling into the feedback path, preserving regulation accuracy and stability-especially critical at high switching frequencies.

Is the MPQ8632GL-6-Z RoHS-compliant and lead-free?

Yes - MPQ8632GL-6-Z is lead-free and fully compliant with the EU RoHS directive. All MPS products adhere to green manufacturing standards, and full compliance documentation is available on the Monolithic Power Systems website under Quality Assurance resources.

What thermal resistance values apply to the MPQ8632GL-6-Z QFN-16 package?

The MPQ8632GL-6-Z in its 3mm×4mm QFN package has θ_JA = 46°C/W and θ_JC = 9°C/W when mounted on a standard 4-layer JEDEC PCB per JESD51-7. These values assume proper thermal pad soldering and copper pour; actual board-level performance depends on layout and airflow.

Does MPQ8632GL-6-Z support pre-bias start-up?

Yes - MPQ8632GL-6-Z safely starts into a pre-charged output capacitor without forcing reverse current through the low-side MOSFET. This prevents output voltage collapse and potential damage to downstream circuitry during hot-plug or multi-rail sequencing scenarios.