Overview
The TPS23861PW, produced by Texas Instruments, is an IEEE 802.3at compliant Power Sourcing Equipment (PSE) controller designed for Power over Ethernet (PoE) applications. This component is an easy-to-use, flexible solution that automatically manages four 802.3at ports without the need for any external control. It detects Powered Devices (PDs) with a valid signature, determines their power requirements according to classification, and applies power accordingly. The TPS23861PW supports two-event classification for type-2 PDs and features DC disconnection and an external FET architecture, allowing designers to balance size, efficiency, and solution cost requirements.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Package Type | TSSOP (28-pin) | 9.80 mm x 6.60 mm |
| Operating Temperature | -40°C to 125°C | |
| VDD Voltage | 3.3 V | |
| VDD Current | Typical: 5 mA, Maximum: 6 mA | |
| VPWR Voltage | Typical: 57 V | |
| VPWR UVLO Falling Threshold | 14.5 V to 17.5 V | |
| VPWR UVLO Rising Threshold | 15.5 V to 18.5 V | |
| Sense Resistor | 255-mΩ | |
| Detection Method | 4-Point detection |
Key Features
- Automatic detection, classification, and power application for Powered Devices (PDs) according to IEEE 802.3at standard.
- Supports two-event classification for type-2 PDs.
- Auto Turn-On and disconnect capabilities.
- Efficient 255-mΩ sense resistor and Kelvin Current Sensing.
- Pin-Out design enables two-layer PCBs with logical grouping and clear differentiation of I²C and power pins.
- Semi-Auto Mode via I²C control for precision monitoring and intelligent power management.
- Compliance with the 400-ms T PON specification in both automatic and semi-automatic modes.
- Fast-Port shutdown input and optional I²C control and monitoring.
Applications
- Ethernet switches.
- Surveillance Network Video Recorders (NVRs).
- Small home/office routers.
- Other PoE-enabled devices requiring up to 30W of power per port.
Q & A
- What is the TPS23861PW used for?
The TPS23861PW is used as a Power Sourcing Equipment (PSE) controller for Power over Ethernet (PoE) applications, managing up to four 802.3at ports.
- What is the operating temperature range of the TPS23861PW?
The operating temperature range is -40°C to 125°C.
- What is the typical VDD voltage and current for the TPS23861PW?
The typical VDD voltage is 3.3 V, and the typical VDD current is 5 mA.
- Does the TPS23861PW support semi-automatic mode?
- What is the sense resistor value in the TPS23861PW?
The sense resistor value is 255 mΩ.
- How does the TPS23861PW detect Powered Devices (PDs)?
The TPS23861PW uses a 4-point detection method to detect PDs with a valid signature.
- Is the TPS23861PW compliant with any specific standards?
- What is the package type and size of the TPS23861PW?
The package type is TSSOP (28-pin), and the size is 9.80 mm x 6.60 mm.
- Can the TPS23861PW be used in two-layer PCB designs?
- What are some common applications of the TPS23861PW?
