The TPS23882B is an 8-channel power sourcing equipment (PSE) controller engineered to insert power onto Ethernet cables in accordance with the IEEE 802.3bt standard. The PSE controller can detect powered devices (PDs) that have a valid signature, complete mutual identification, and apply power.
The TPS23882B improves on the TPS2388 with reduced current sense resistors, SRAM programmability, programmable power limiting, capacitance measurement, and compatibility with TI's FirmPSE system firmware (see Device Comparison Table).
Programmable SRAM enables in-field firmware upgradability over I2C to ensure IEEE compliance and interoperability with the latest PoE enabled devices. Dedicated per port ADCs provide continuous port current monitoring and the ability to perform parallel classification measurements for faster port turn on times. A 1.25-A port current limit and adjustable power limiting allows for the support of non-standard applications above 60-W sourced. The 200-mΩ current sense resistor and external FET architecture allow designs to balance size, efficiency, thermal and solution cost requirements.
Port remapping and pin-to-pin compatibility with the TPS2388, TPS23880, and TPS23881 devices eases migration from previous generation PSE designs and enables interchangeable 2-layer PCB designs to accommodate different system PoE power configurations.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
TPS23882B | VQFN (56) | 8.00 mm × 8.00 mm |
Changes from Revision * (April 2021) to Revision A (February 2022)
Table 5-1 summarizes the primary differences between the available 2-pair PSE devices.
KEY FEATURES | TPS23880 | TPS23881 | TPS23882B |
---|---|---|---|
Compatible with TI's FirmPSE system firmware | N/A | Yes | Yes |
Pin-to-pin compatible | Yes | Yes | Yes |
Number of PSE channels | 8 | 8 | 8 |
Supported IEEE 802.3 PSE Types | PoE 2 802.3bt Type 3 or 4 (2 or 4 pair) | PoE 2 802.3bt Type 3 or 4 (2 or 4 pair) | PoE 2 802.3bt Type 3 (2 pair) |
RSENSE | 0.255 Ω | 0.200 Ω | 0.200 Ω |
2-pair PCUT programmable ranges | 0.5 W to 54 W | 2 W to 65 W | 2 W to 65 W |
4-pair PCUT programmable ranges | 0.5 W to 108 W | 4 W to 127 W | N/A |
90+ W 4-pair PCUT accuracy | ±3.0 % | ±2.5 % | N/A |
Channel capacitance measurement range | N/A | 1 µF to 12 µF | 1 µF to 12 µF |
ULA packaging | No | Yes (TPS23881A) | N/A |
I2C programmable SRAM memory | 16 kB | 16 kB | 16 kB |
KEY FEATURES | TPS23861 | TPS2388 | TPS23881 | TPS23882B |
---|---|---|---|---|
Compatible with TI's FirmPSE system firmware | N/A | N/A | Yes | Yes |
Pin-to-pin compatible | N/A | Yes | Yes | Yes |
Number of PSE channels | 4 | 8 | 8 | 8 |
Supported IEEE 802.3 PSE Types | PoE 1 802.3 at Type 1 or 2 | PoE 1 802.3 at Type 1 or 2 | PoE 2 802.3bt Type 3 or 4 (2 or 4 pair) | PoE 2 802.3bt Type 3 (2 pair) |
RSENSE | 0.255 Ω | 0.255 Ω | 0.200 Ω | 0.200 Ω |
2-pair PCUT programmable ranges | N/A ICUT adjustable up to 920 mA | N/A ICUT adjustable up to 920 mA | 2 W to 65 W | 2 W to 65 W |
TMPS | 15 ms | 15 ms | 3 ms | 3 ms |
Port current limit (1x / 2x) | 425 mA / 1060 mA | 425 mA / 1060 mA | 425 mA / 1250 mA | 425 mA / 1250 mA |
Channel capacitance measurement range | N/A | N/A | 1 µF to 12 µF | 1 µF to 12 µF |
PD auto-class discovery and power measurement | N/A | N/A | Yes | Yes |
I2C programmable SRAM memory | N/A | N/A | 16 kB | 16 kB |