Monolithic Power Systems Inc. MPQ8632GL-6-P

Overview

MPQ8632GL-6-P 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-P datasheet, MPQ8632GL-6-P pinout, MPQ8632GL-6-P application, or MPQ8632GL-6-P equivalent, key selection criteria include its 16-pin QFN 3mm×4mm package, 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-P implements adaptive COT control with feed-forward compensation, enabling ultrafast transient response without external loop compensation. Its one-shot on-time timer sets minimum on-time at 20–40 ns and supports stable operation across input voltage variation via FREQ pin connection to VIN.

It integrates dual N-channel MOSFETs, a 4.8V internal LDO for gate drive, bootstrap circuitry, and protection features including non-latch OCP (11 A typical valley limit), OVP (120% V_FB threshold), and thermal shutdown at 150°C with 25°C hysteresis.

Key Specifications

Pinout & Package

MPQ8632GL-6-P uses a thermally enhanced 16-pin QFN package (3 mm × 4 mm, 0.5 mm pitch) with exposed thermal pad. Pin 1 is EN; pins 9 and 14 are VIN; pins 10–13 are PGND; pins 15–16 are SW; and the exposed pad is connected to PGND for optimal thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ8632GL-6-P, MPQ8632GLE-6 offers identical performance in reel format, while RTQ2132BGQW trades transient response and startup flexibility for lower BOM count and reduced external component count-making it viable only in non-critical, fixed-frequency applications.

Availability

MPQ8632GL-6-P is available at Aetrix Electronics and suitable for telecom infrastructure, server power delivery, and flat-panel display bias applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MPQ8632GL-6-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 leadership in DC/DC conversion technology.

The MPQ8632 family targets high-density, high-efficiency point-of-load regulation in telecom, computing, and consumer electronics, emphasizing integration, thermal robustness, and ease of design-in through COT architecture and minimal external components.

FAQ

What is the maximum allowable input voltage for MPQ8632GL-6-P?

The absolute maximum input voltage is 21 V, but the recommended operating range is 2.5 V to 18 V with external 5 V bias or 4.5 V to 18 V with internal bias. Exceeding 18 V continuously risks violating SOA limits and triggering thermal shutdown, even if below the 21 V absolute rating.

Does MPQ8632GL-6-P support output voltages below 1 V?

Yes-it supports output voltages from 0.611 V to 13 V using an external resistor divider on the FB pin. At 0.611 V, the reference voltage tolerance (±3 mV) yields ±0.5% accuracy, making it suitable for sub-1 V FPGA core rails when paired with precision resistors.

How is switching frequency set, and does it vary with input voltage?

Frequency is set by connecting a resistor between FREQ and VIN; typical values range from 453 kΩ (250 ns on-time, ~500 kHz) to 1.1 MΩ (~200 kHz). Due to feed-forward compensation, frequency remains nearly constant across input voltage changes-deviation is <±3% from 4.5 V to 18 V.

Can MPQ8632GL-6-P start up into a pre-biased output?

Yes-its pre-bias start-up feature allows safe operation when the output capacitor is already charged. The IC disables the low-side MOSFET until the feedback voltage falls below the reference, preventing reverse current and output voltage collapse during hot-insertion scenarios.

What thermal derating applies above 25°C ambient?

With θ_JA = 46°C/W on a 4-layer PCB, maximum continuous power dissipation drops linearly: at 70°C ambient, PD_MAX = (150°C − 70°C)/46°C/W ≈ 1.74 W. For 6 A output at 1 V, this corresponds to ~70% load at full ambient-PCB copper area and airflow must be validated per application.

Is the power-good signal actively driven or open-drain?

The PG pin is open-drain and requires an external pull-up resistor (typically 10 kΩ to 3.3 V or 5 V). It asserts high when V_FB ≥ 91% of nominal and de-asserts low when V_FB ≤ 80%, with a fixed 2.5 ms delay from threshold crossing to state change-critical for reliable system reset sequencing.

What is the minimum off-time specification, and why does it matter?

Minimum off-time is 200–420 ns depending on variant; for MPQ8632GL-6-P it is 360 ns typical. This limits the maximum duty cycle at high input-to-output ratios (e.g., 12 V → 1 V), constraining achievable frequency and requiring careful inductor selection to avoid subharmonic oscillation in CCM.