Overview
The TPS2388RTQR, produced by Texas Instruments, is an 8-channel Power-over-Ethernet (PoE) Power Source Equipment (PSE) controller. It is designed to comply with the IEEE 802.3at-2012 standard, enabling the insertion of power onto Ethernet cables. This controller is engineered to detect powered devices (PDs) with a valid signature, determine their power requirements, and apply power accordingly. The TPS2388RTQR supports both Type 1 and Type 2 PD classification and can also handle non-standard loads such as UPoE.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Operating Temperature | -40 | 125 | °C | |
| VDD (Digital Supply) | 2.6 | 3.3 | 3.6 | V |
| VPWR (Analog 48-V Positive Supply) | 44 | 48 | 57 | V |
| Detection Current (First Detection Point) | 145 | 160 | 190 | µA |
| Accepted Resistance Range | 19 | 22.75 | 26.5 | kΩ |
| Current Sense Resistor | 0.255 | Ω | ||
| Current Reading Accuracy | -3% | 3% | ||
| Package Type | VQFN (56 pins) | |||
| Junction-to-Ambient Thermal Resistance | 25.3 | °C/W |
Key Features
- Fully IEEE 802.3at compliant
- Port re-mapping and 2-layer PCB design support
- 1- and 3-bit fast port shutdown input
- 'Never Fooled' 4-point detection method
- Type 1 and Type 2 PD classification
- Programmable current limit with foldback
- DC disconnect detection
- Flexible processor-controlled operating modes (semiauto, manual)
- 14-bit port current and voltage monitoring with 100-ms rolling port current averaging
- I2C communication with I2C watchdog for failsafe operation
- Support for UPoE and other non-standard loads
Applications
- Enterprise switches and routers
- SoHo switches and routers
- PoE pass-through power modules
- Network video recorders (NVRs)
Q & A
- What is the TPS2388RTQR used for?
The TPS2388RTQR is used as an 8-channel Power-over-Ethernet (PoE) Power Source Equipment (PSE) controller to insert power onto Ethernet cables according to the IEEE 802.3at-2012 standard. - What types of PD classification does the TPS2388RTQR support?
The TPS2388RTQR supports both Type 1 and Type 2 PD classification. - What is the 'Never Fooled' 4-point detection method?
The 'Never Fooled' 4-point detection method is a proprietary technique used by the TPS2388RTQR to determine the signature resistance of the PD, ensuring reliable detection. - What are the operating temperature ranges for the TPS2388RTQR?
The operating temperature range is from -40°C to 125°C. - What is the typical voltage for the VPWR supply?
The typical voltage for the VPWR supply is 48 V. - What is the current sense resistor value used in the TPS2388RTQR?
The current sense resistor value is 0.255 Ω. - Does the TPS2388RTQR support I2C communication?
Yes, the TPS2388RTQR supports I2C communication with I2C watchdog for failsafe operation. - What are some of the key applications of the TPS2388RTQR?
Key applications include enterprise switches and routers, SoHo switches and routers, PoE pass-through power modules, and network video recorders (NVRs). - How does the TPS2388RTQR handle port shutdown?
The TPS2388RTQR has a fast shutdown input (OSS) that allows for immediate disabling of multiple ports with up to eight levels of per-port shutdown priority. - What package type is the TPS2388RTQR available in?
The TPS2388RTQR is available in a 56-pin VQFN package.
