Skyworks Solutions Inc. SI3406FBC2-KIT

Overview

SI3406FBC2-KIT from Skyworks Solutions is an evaluation kit for the Si34062-A-GM IEEE 802.3at-compliant PoE+ powered device (PD) controller, integrating hot-swap control, current-mode DC-DC regulation, synchronous rectification drive, sleep/wake logic, and LED driver functionality in a 24-pin 5×5 mm QFN package. It supports isolated/non-isolated flyback topologies, tunable 100–500 kHz switching frequency, auxiliary transformer bias winding, and maintains power signature (MPS) generation for PoE+ compatibility up to Class 4.

For engineers reviewing the SI3406FBC2-KIT datasheet, SI3406FBC2-KIT pinout, SI3406FBC2-KIT application, or SI3406FBC2-KIT equivalent, this kit enables rapid validation of PoE+ PD designs for IP phones, surveillance cameras, and wireless access points - with focus on low-standby-current operation, LED status indication, and seamless transition between active/sleep states under IEEE 802.3at detection/classification sequences.

Technical Context

The SI3406FBC2-KIT implements the Si34062-A-GM IC, which integrates a 120 V absolute max-rated PoE line interface with internal diode bridges and surge protection, a current-mode PWM controller supporting buck/flyback topologies, and dedicated circuitry for IEEE 802.3at two-event classification. Its architecture includes automatic MPS generation, nSLEEP-triggered latched sleep mode, WAKE pin edge-sensitive wake-up, and MODE pin-controlled MPS enablement during sleep.

It features dual-regulator support (11 V open-loop for gate drivers, 5 V closed-loop for LEDs/optocouplers), VT15-biased auxiliary winding input for efficiency optimization, and configurable RFREQ-based oscillator tuning. The kit provides full reference design implementation including external FETs, transformers, feedback networks, and wall adapter (12–57 V) support via ASUP pin.

Key Specifications

Availability

SI3406FBC2-KIT is available at Aetrix Electronics and suitable for PoE+ system validation, IEEE 802.3at compliance testing, and low-power sleep-mode development requiring stable component supply and documented reference design implementation.

Supply support for SI3406FBC2-KIT 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

Skyworks Solutions is a global semiconductor company specializing in analog and mixed-signal connectivity solutions for wireless, broadband, automotive, and industrial markets.

The Si3406x family - including the Si34062-A-GM used in SI3406FBC2-KIT - was designed specifically for high-efficiency, feature-rich PoE+ powered devices requiring integrated power management, robust surge protection, and intelligent power-state control in space-constrained applications.

FAQ

What is the primary function of the SI3406FBC2-KIT?

The SI3406FBC2-KIT is an evaluation kit for the Si34062-A-GM PoE+ PD controller IC. It enables hardware validation of IEEE 802.3at-compliant powered device designs, including detection/classification, hot-swap control, DC-DC conversion, sleep/wake sequencing, and LED status indication. The SI3406FBC2-KIT includes all necessary components - transformer, FETs, feedback network, and layout - to replicate a production-ready PoE+ PD implementation.

Does the SI3406FBC2-KIT support both isolated and non-isolated DC-DC topologies?

Yes, the SI3406FBC2-KIT supports both isolated flyback and non-isolated buck converter topologies using the Si34062-A-GM's flexible feedback architecture. It provides dedicated FBH (high-side), FBL (low-side), and EROUT (isolated current-output) pins to configure the control loop appropriately. Reference schematics in the kit documentation demonstrate both configurations with verified performance metrics.

How does the SI3406FBC2-KIT implement IEEE 802.3at two-event classification?

The SI3406FBC2-KIT leverages the Si34062-A-GM's built-in state machine to execute IEEE 802.3at two-event classification: after initial detection, it responds to the PSE's Mark1/Mark2 voltage transitions by asserting nT2P to signal Class 4 readiness. This allows the host system to enable high-power mode only when confirmed by the PSE - a behavior fully demonstrated and testable on the SI3406FBC2-KIT board.

Can the SI3406FBC2-KIT be used with external wall adapters?

Yes, the SI3406FBC2-KIT supports auxiliary wall adapter input from 12 V to 57 V via the ASUP pin, enabling dual-input (PoE + adapter) redundancy or fallback operation. The kit includes RASUP and associated circuitry per Figure 2.9 of the Si3406x datasheet, allowing seamless switchover and stable output regulation regardless of input source.

What sleep-related features are validated by the SI3406FBC2-KIT?

The SI3406FBC2-KIT validates the Si34062-A-GM's full sleep architecture: nSLEEP-triggered latched sleep entry, WAKE pin edge-sensitive wake-up, MODE pin-controlled MPS enablement during sleep, and integrated LED driver for status indication. All signals - nSLEEP, WAKE, MODE, LED - are accessible on the kit's test points and headers for real-time monitoring and control.