Monolithic Power Systems Inc. MP8008LGV-P

Overview

MP8008LGV-P from Monolithic Power Systems is a fully integrated IEEE 802.3af/at-compliant powered device (PD) interface with peak-current-mode flyback controller, delivering up to 25.5W input power handling, featuring a 100V/0.48Ω integrated hot-swap MOSFET, 85mA inrush current limit, and 840mA operational current limit for PoE-powered security cameras and WLAN access points.

For engineers reviewing the MP8008LGV-P datasheet, MP8008LGV-P pinout, MP8008LGV-P application, or MP8008LGV-P equivalent, this IC enables robust front-end PoE PD design with minimal external components, programmable 30–400kHz switching frequency, pulse-skip light-load operation, and dual-input support (PSE or wall adapter).

Technical Context

The MP8008LGV-P implements a two-stage PoE interface: first, an IEEE 802.3af/at-compliant detection/classification engine with 1-event (Class 0–3) and 2-event (Class 4) classification logic, plus mark-event signaling; second, a peak-current-mode flyback PWM controller with cycle-by-cycle current limiting, programmable soft-start, and isolated/non-isolated feedback configuration via ISENSE and FB pins.

Its dual-input architecture uses AUX voltage comparison (−2.3V threshold vs. VDD) to auto-select between PSE and auxiliary wall adapter power sources, while T2P provides open-drain Type-2 PSE presence indication and PG delivers power-good status with internal 30μA pull-up-both usable for automatic flyback enable sequencing when tied to EN/SYNC.

Key Specifications

Pinout & Package

MP8008LGV-P is housed in a thermally enhanced QFN-28 (4mm × 5mm) package with exposed thermal pad, optimized for PoE PD board space constraints and thermal dissipation in enclosed enclosures.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PoE PD interface with flyback controller applications.

Compared with LT4275AIMSE#PBF and TPS23754PWPR, MP8008LGV-P uniquely combines full 802.3at Class 4 support, integrated flyback control, and dual-input auto-selection-reducing component count by ≥40% versus discrete solutions while enabling higher-power, field-upgradeable PoE endpoints.

Availability

MP8008LGV-P is available at Aetrix Electronics and suitable for security camera systems, WLAN access points, video telephony terminals, and industrial IoT gateways requiring stable component supply across production lifecycles.

Supply support for MP8008LGV-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 core expertise in DC-DC conversion, LED drivers, and PoE solutions.

The MP8008L product line delivers highly integrated PoE PD front-ends targeting high-reliability, space-constrained endpoints such as surveillance cameras and wireless infrastructure-designed to reduce bill-of-materials and accelerate time-to-market.

FAQ

What is the maximum input voltage the MP8008LGV-P can withstand during PoE surge events?

The MP8008LGV-P supports absolute maximum VDD–VSS of +100V, with its integrated 100V hot-swap MOSFET rated for transient overvoltage conditions common in PoE installations. This rating exceeds IEEE 802.3at's 60V maximum operating voltage, providing margin against lightning-induced surges and cable discharge events without external TVS diodes.

How does the MP8008LGV-P handle dual power sources (PSE and wall adapter)?

The MP8008LGV-P uses the AUX pin to detect wall adapter presence: when VDD − AUX exceeds −2.3V, it disables the PoE hot-swap FET and CLASS circuitry, activates T2P low, and routes power through the auxiliary path. No external OR-ing controller is required-the IC automatically selects the higher-priority source based on voltage thresholds and hysteresis.

Can the MP8008LGV-P be used in non-isolated flyback (buck-derived) topologies?

Yes-the MP8008LGV-P supports both isolated and non-isolated configurations. When ISENSE is used for current sensing and FB is shorted to GND, the controller operates in non-isolated mode with COMP as error amplifier output. The datasheet provides explicit reference designs for buck-derived topologies delivering up to 12V/2.1A with <1% load regulation.

What is the purpose of the T2P pin, and how is it used in system design?

T2P is an open-drain output that pulls low to VSS when a Type-2 PSE or wall adapter is detected. System designers use T2P to inform the host microcontroller of power source type, enabling dynamic power budgeting-for example, increasing Wi-Fi transmit power only when 25.5W PoE++ is confirmed, or disabling high-power peripherals during 802.3af-only operation.

Does the MP8008LGV-P require an external optocoupler for feedback in isolated flyback designs?

No-the MP8008LGV-P integrates a primary-side sensing architecture that eliminates the need for an optocoupler in isolated flyback designs. It uses the ISENSE pin for primary-side current sensing and the FB pin for voltage feedback via a resistive divider across the secondary output, achieving ±3% output regulation without secondary-side compensation components.

What thermal performance can be expected in a standard 2-layer PCB layout?

On a JEDEC-standard 2-layer PCB (JESD51-7), the MP8008LGV-P exhibits θ_JA = 40°C/W. At 25°C ambient and 2.1A output load (12V), junction temperature rise is approximately 84°C-well below the 125°C max operating limit. Adding a 25mm² copper pour under the exposed thermal pad reduces θ_JA to ~32°C/W, enabling full-power operation in sealed enclosures.

How is the 2-event classification sequence implemented for Class 4 detection?

The MP8008LGV-P performs 2-event classification by presenting 40.4mA (Class 4) during the first 14.5–20.5V classification window, then switching to 0.5–2mA during the subsequent 6.9–10.1V mark event. The PSE repeats this sequence once more before applying full power-ensuring unambiguous Type-2 identification without false triggers from legacy PSEs or noise.