Monolithic Power Systems Inc. MPM3864GPQ-P

Overview

MPM3864GPQ-P from Monolithic Power Systems is a fully integrated, synchronous step-down power module with internal inductor, delivering 6A continuous output current across 2.75V–7V input range. It employs constant-on-time (COT) control for fast transient response, features integrated high- and low-side MOSFETs, fixed 1.2MHz switching frequency, and supports adjustable output voltage down to 0.6V - used in FPGA core rail and optical transceiver power supplies.

For engineers reviewing the MPM3864GPQ-P datasheet, MPM3864GPQ-P pinout, MPM3864GPQ-P application, or MPM3864GPQ-P equivalent, key selection criteria include its ECLGA-19 package thermal performance (θJA = 27.5°C/W), pre-biased start-up capability, FCCM operation for low ripple, and integrated PG/EN sequencing support in space-constrained telecom and networking systems.

Technical Context

The MPM3864GPQ-P implements a constant-on-time (COT) control architecture with internal ramp compensation and valley-current limiting, enabling stable regulation without external loop compensation. Its synchronous rectification uses integrated N-channel MOSFETs with dead-time control to prevent shoot-through, and the bootstrap circuit (BST pin) sustains high-side gate drive during continuous conduction.

It integrates a 3.5V LDO-based VCC regulator powered from VIN, supporting full-input-range operation; EN pin logic thresholds (1.23V rise / 1.0V fall) enable direct connection to 3.3V/5V logic rails, while PG provides open-drain fault signaling with 50µs delay and UV/OV/OTP/SCP event detection.

Key Specifications

Pinout & Package

ECLGA-19 (3mm × 3mm × 1.85mm) package with exposed thermal pad on bottom; requires solder paste stencil optimization and ≥6 thermal vias to inner ground plane for θJA ≤27.5°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down power module applications.

Compared with TSM12060 and RTM2020B, the MPM3864GPQ-P uniquely combines integrated inductor, PG/EN sequencing, pre-biased start-up, and ECLGA-19 compactness - making it optimal for FPGA, optical, and space-constrained telecom applications where reliability and layout simplicity are prioritized over marginal thermal or frequency trade-offs.

Availability

MPM3864GPQ-P is available at Aetrix Electronics and suitable for FPGA power systems, optical transceiver modules, telecom infrastructure, and industrial embedded controllers requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for MPM3864GPQ-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 power management ICs and modules, headquartered in Kirkland, WA, with global design and support centers.

The MPM3864 belongs to MPS's integrated power module product line, engineered for high-density, low-noise DC/DC conversion in telecom, networking, and FPGA/ASIC applications where minimal external components and rapid time-to-market are critical.

FAQ

What is the minimum recommended output capacitance for stable operation at 6A load?

The MPM3864GPQ-P requires ≥88µF total output capacitance (e.g., four 22µF X5R ceramics) to maintain stability and meet ripple specifications under full load. Lower values risk instability or excessive voltage deviation during load transients; ceramic types are mandatory due to low ESR and high-frequency response.

Can the MPM3864GPQ-P operate with an input voltage below 2.75V?

No - the absolute minimum input voltage is 2.75V per datasheet specifications. Operation below this threshold disables regulation and may trigger UVLO; the internal VCC regulator requires ≥2.55V to enable core circuitry, and VIN < 2.75V violates recommended operating conditions.

How does the BST pin function, and is external circuitry required?

The BST pin connects to an internal bootstrap capacitor between SW and BST nodes to generate gate drive voltage for the high-side MOSFET. No external components are needed; the pin may be left floating in layouts with low SW node dv/dt, but routing a small ceramic cap (e.g., 0.1µF) improves noise immunity in high-dI/dt environments.

What is the maximum allowable output capacitance before soft-start failure occurs?

Maximum output capacitance is limited by soft-start time and average start-up current. For tSS = 10ms and ILIM_AVG ≈ 6A, CO_MAX ≈ 1000µF. Exceeding this risks VOUT failing to reach regulation before SS completes, causing hiccup-mode restart; use Equation (10) from datasheet Rev. 1.0 to calculate exact limit for your VOUT and tSS.

Does the MPM3864GPQ-P support parallel operation for higher current?

No - the MPM3864GPQ-P is not designed for current sharing or paralleling. Its COT control lacks master/slave synchronization capability, and phase interleaving is unsupported. For >6A requirements, select a higher-current module (e.g., MPM3833C) or implement discrete controller + DrMOS solutions.

Is the ECLGA-19 package lead-free and RoHS compliant?

Yes - the MPM3864GPQ-P is fully lead-free, halogen-free, and compliant with EU RoHS Directive 2011/65/EU. MPS confirms green status on its official website under Quality Assurance, and the device meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL 3) per ordering information.

What thermal derating applies above 25°C ambient temperature?

At 6A load, output current must be reduced linearly above 25°C ambient: 6A at 25°C, ~4.5A at 60°C, and 0A at ~95°C (no airflow). Derating follows the curve in Figure 9 of Rev. 1.0 datasheet and assumes standard 4-layer PCB with 2oz copper and thermal vias to inner ground plane.