Texas Instruments TPS2378DDA PoE PD Controller SOIC-8

The Texas Instruments TPS2378DDA is a high-performance IEEE 802.3at (PoE+) Power over Ethernet Powered Device (PD) interface controller. Designed for demanding applications, it integrates a robust 100V, 0.5Ω hot-swap MOSFET, enabling efficient power management directly from an Ethernet cable. With a typical operating current limit of 1A and the ability to continuously handle up to 0.85A, this controller is built for reliability and sustained operation.

A key feature is the auxiliary power detect (APD) input, which provides intelligent priority switching between PoE and an external auxiliary power adapter, offering design flexibility for systems with multiple power sources. The controller includes comprehensive protection mechanisms such as 140mA inrush current limiting, current limit foldback, thermal shutdown, and auto-retry fault protection to ensure system safety and longevity. It also provides a convenient open-drain power-good output for system status monitoring.

Engineered for resilience, the TPS2378DDA boasts 15kV and 8kV system-level ESD capability, making it suitable for use in electrically challenging environments. Its low internal switch resistance and enhanced thermal dissipation design contribute to high efficiency and minimal power loss. Housed in a compact SOIC-8 surface-mount package, it is ideal for space-constrained designs requiring high-power PoE connectivity.

Key Features & Specifications

• PoE Standard: Compliant with IEEE 802.3at (PoE+).
• Controller Type: Powered Device (PD) Interface.
• Maximum Input Voltage: 57V.
• Internal MOSFET: Robust 100V, 0.5Ω hot-swap.
• Current Handling: Supports continuous current up to 0.85A.
• Power Good Output: Open-drain output for status indication.
• Protection Features: Includes inrush current limiting, thermal shutdown, current limit foldback, and auto-retry.
• **ESD Protection: