Monolithic Power Systems Inc. MP8004GQW-P

Overview

MP8004GQW-P from Monolithic Power Systems is an integrated IEEE 802.3af-compliant Powered Device (PD) interface with embedded flyback DC/DC converter, delivering up to 13W PoE power. It integrates a 100V/1Ω PD pass switch, 150V/0.45Ω internal power switch, and supports detection, classification, inrush limiting, and full protection (OCP, SCP, OTP, UVLO/OVLO). It targets compact PoE-PD front-end designs such as VoIP phones and security cameras.

For engineers reviewing the MP8004GQW-P datasheet, MP8004GQW-P pinout, MP8004GQW-P application, or MP8004GQW-P equivalent, this device serves as a single-chip solution for IEEE 802.3af PD power conversion-requiring no external gate driver, minimal passive count, and thermal-aware startup sequencing via PG-controlled LINE enable.

Technical Context

The MP8004GQW-P implements dual-stage power management: a PD interface with programmable detection threshold (1.9V–11V), classification current sourcing (2.2–41.2mA across Class 0–4), and thermally regulated inrush control; followed by a flyback controller with line feed-forward duty-cycle limiting (67.5% max at V_LINE = 1.3V), internal slope compensation, and auto-retry hiccup-mode OCP.

Its architecture separates thermal monitoring for the PD pass device (latch-off after 8 overtemp events) and DC/DC switch (auto-recovery), while enabling synchronous clocking via RT pin and supporting auxiliary V_CC biasing to reduce startup dissipation. The error amplifier features 1.21V internal reference, 60dB DC gain, and 1MHz bandwidth for stable opto-coupled or resistive feedback loops.

Key Specifications

Pinout & Package

MP8004GQW-P is housed in a thermally enhanced 4mm × 6mm QFN-20 package with exposed thermal pad connected to GND pins (1, 2). Pin functions are validated per MPS MP8004 Rev.1.1 datasheet.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar IEEE 802.3af PoE PD interface applications.

Compared with LT4275IMS#PBF and TPS23753APWR, MP8004GQW-P reduces component count and thermal design effort by integrating both PD interface and 150V/0.45Ω power switch - making it optimal for space-constrained 13W PoE-PD systems where bill-of-materials simplicity and thermal reliability are prioritized.

Availability

MP8004GQW-P is available at Aetrix Electronics and suitable for VoIP telephony, security camera systems, wireless access points, and small-cell base stations requiring stable component supply and full IEEE 802.3af compliance.

Supply support for MP8004GQW-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 a focus on energy-efficient power management solutions for computing, communications, and industrial markets.

The MP8004 product line delivers fully integrated PoE-PD front-ends targeting compact, cost-sensitive 802.3af applications - emphasizing minimal external components, robust thermal management, and seamless PSE interoperability.

FAQ

What is the maximum continuous output power supported by MP8004GQW-P?

The MP8004GQW-P is rated for up to 13W of continuous PoE output power under IEEE 802.3af specifications. This is achieved with high-efficiency flyback operation across the 37–57V input range, validated at 12V/1A output with >85% typical efficiency. Output power is limited by thermal constraints of the QFN-20 package and internal 150V switch derating.

How does the MP8004GQW-P handle inrush current during capacitor charging?

The MP8004GQW-P uses an externally programmable inrush current limit via the ILIM pin (R_ILIM). With a typical 178kΩ resistor, it delivers 120–200mA constant-current charging to the DC/DC input capacitor, preventing die overheating. If thermal shutdown occurs, the device auto-retries up to 8 times before latching off - a behavior confirmed in electrical characterization testing.

Can the MP8004GQW-P be synchronized to an external clock?

Yes - the RT pin supports external clock synchronization. An AC-coupled pulse (3.5V peak, 50–150ns width) at a frequency higher than the internal oscillator's setting can override the RT resistor-defined frequency. This feature is documented in the "Synchronize Programmable Oscillator" section of the datasheet and verified in typical performance curves.

What protection features are implemented in the DC/DC section?

The DC/DC section includes cycle-by-cycle over-current protection (4A threshold), hiccup-mode short-circuit response, over-voltage lockout (6.3–6.9V on V_CC), under-voltage lockout (4.3–4.7V on V_CC), and thermal shutdown (150°C). All protections are silicon-verified and characterized per MPS MP8004 Rev.1.1 test reports.

Is the MP8004GQW-P RoHS and halogen-free compliant?

Yes - all MPS parts, including MP8004GQW-P, are lead-free, halogen-free, and comply with the EU RoHS directive. Green status documentation is publicly available on the Monolithic Power Systems website under Quality Assurance, and the device carries the standard MPS RoHS marking on its top-side laser etch.

Does the MP8004GQW-P support IEEE 802.3at (PoE+) or 802.3bt?

No - the MP8004GQW-P is strictly IEEE 802.3af (Type 1) compliant. It lacks the higher-power classification signatures (e.g., 2-event classification), extended voltage tolerance (>57V), and dual-signature detection required for 802.3at/802.3bt. Its absolute maximum VDD rating is 100V, but operational compliance is limited to 802.3af's 37–57V range.

What is the recommended minimum output capacitance for stable regulation?

The datasheet specifies a minimum 1µF ceramic capacitor between V_CC and GND for stable bias operation. For the main DC/DC output, stability depends on feedback compensation and transformer design - no fixed minimum output capacitance is mandated, but typical 12V/1A designs use ≥22µF low-ESR electrolytic + 1µF ceramic for transient response, as shown in the "Typical Application" schematic.