Class 3 15W Power over Ethernet (PoE) Powered Devices

Si3402 and Si3404 PoE Powered Devices are the most highly-integrated, IEEE 802.3at Type 1-compliant, PoE PD interface and pulse-width-modulated (PWM) switching regulator devices in the industry. Si3402 and Si3404 products set a new bar for device integration, lowest overall BOM cost, efficiency and reliability and enable quick addition of PoE functionality to Ethernet applications. When included in the design of a PoE-enabled system, such as a wireless access point or VoIP phone, Si3402 and Si3404 devices convert the high voltage (typically ±48 V) supplied over Ethernet copper UTP cabling into a regulated, low-voltage dc supply. Si3402 and Si3404 devices combine all the required IEEE 802.3 at Type 1 detection, classification and hot swap interfaces with a complete, high efficiency, PWM switching regulator.

Si3402-B is a pin-compatible replacement for the end-of-life Si3402-A. Existing customer products based on Si3402-A EVB reference designs can be readily re-used with minimal change to a few on-board components. Si3402 is a strong legacy device with long-term support, is available in a 5mm x 5mm QFN package and includes input diode bridges on chip. The newer Si3404 offers additional features in a compact 4mm x 4mm QFN package and does not include input diode bridges on-chip.

4 x 4 mm
Integrated dc dc converter

Class 3 15W Powered Devices Common Specs

  • 非絶縁型および絶縁型スイッチング・トポロジをサポート
  • 完全に統合された高電圧デバイス
  • 2つの完全なダイオード・ブリッジ(Si3402)
  • 過渡電圧サプレッサ
  • スイッチング・レギュレータ・ドライバ FET
  • デュアル電流制限ホット・スワップ・スイッチ
  • チューニング可能なスイッチング周波数(Si3404)
  • 包括的な保護回路
  • 過渡過電圧保護
  • 低電圧ロックアウト
  • サーマル・シャットダウン保護
  • フォールド・バック電流制限
  • 低 EMI スルー・レート制御
  • 変圧器バイアス巻線サポート(Si3404)
Find the Right Class 3 15W Device Select Columns
部品番号 説明 IEEE 仕様 最大出力(W) パッケージ・タイプ パッケージ・サイズ(mm) 自動 MPS サポート 補助アダプタ・サポート 変圧器バイアス巻線入力 DC DC 効率(%) スリープ・モード 周波数範囲のスイッチング(kHz) 同期 FET ドライバ 温度範囲(ºC)
IEEE 802.3af Type 1 PD interface with dc-dc converter 802.3at タイプ 1 15 QFN20 5 x 5 78 350 350 -40 85
IEEE 802.3af Type 1 PD interface with high efficiency dc-dc converter and compact footprint 802.3at タイプ 1 15 QFN20 4 x 4 80 100 500 -40 85

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