Texas Instruments TPS23880RTQT

Overview

TPS23880RTQT from Texas Instruments is an IEEE 802.3bt-compliant Type-4 4-pair 8-channel Power Sourcing Equipment (PSE) controller with programmable SRAM, ±3% programmable port power limiting, 2% per-port current sensing accuracy, and support for 90 W per port. It enables high-power PoE delivery in video surveillance NVRs and enterprise campus switches.

For engineers reviewing the TPS23880RTQT datasheet, TPS23880RTQT pinout, TPS23880RTQT application, or TPS23880RTQT equivalent, key selection criteria include 8-channel independent control, 4-point detection reliability, 14-bit per-port integrating ADC, -40°C to +125°C operation, and I²C-programmable SRAM for field firmware updates.

Technical Context

The TPS23880RTQT implements a dedicated 14-bit integrating ADC per channel for noise-immune current measurement and DC disconnect, with 100-ms rolling averaging and inherent filtering. Its 4-point detection logic prevents false powering by validating PD signature across four voltage-current points before enabling power.

It supports flexible port configuration-each of eight channels can be assigned as either 2-pair (1-channel) or 4-pair (2-channels) PoE ports-and features fast shutdown via 1-bit or 3-bit OSS input with up to eight priority levels. The external FET architecture uses a 0.255 Ω sense resistor and Kelvin-sense inputs (KSENSA–D) for precision current monitoring.

Key Specifications

Pinout & Package

VQFN-56 (RTQT) package, 8.00 mm × 8.00 mm body size with exposed thermal pad; requires low-resistance connection of AGND and DGND to PCB ground plane via thermal pad.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PoE PSE controller applications.

Compared with TPS23881RTQT and TPS23882RTQT, the TPS23880RTQT uniquely delivers full IEEE 802.3bt Type 4 4-pair support with ±3% 90 W power limiting and no UL packaging requirement-making it the optimal choice for high-power, non-UL-certified infrastructure where flexibility and cost efficiency are prioritized.

Availability

TPS23880RTQT is available at Aetrix Electronics and suitable for video surveillance NVRs, enterprise campus switches, and small business PoE switches requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for TPS23880RTQT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and connectivity technologies with leadership in power management and industrial communications ICs.

The TPS23880RTQT belongs to TI's PoE PSE controller product line, designed specifically for high-density, high-power IEEE 802.3bt-compliant network infrastructure requiring field-upgradable firmware, precise per-port power control, and robust fault handling.

FAQ

What is the maximum per-port power capability of the TPS23880RTQT?

The TPS23880RTQT supports up to 90 W per port in 4-pair mode per IEEE 802.3bt Type 4 specifications. Its ±3% programmable port power limit enables system-level power management above 90 W while staying within 100 W safety margins. This capability is confirmed in the device description and electrical characteristics section of the official datasheet, where 4-pair PCUT ranges extend to 108 W with ±3.0% accuracy.

Does the TPS23880RTQT support both 2-pair and 4-pair PoE configurations?

Yes, the TPS23880RTQT supports selectable 2-pair or 4-pair port power allocations across its eight independent channels. It enables configurations such as 15.4 W (2-pair), 30 W (2-pair), 45 W (2-pair), 60 W (2-pair), 75 W (4-pair), and 90 W (4-pair). This flexibility is explicitly stated in the Features section and validated in the Device Comparison Table, which confirms PoE 2 802.3bt Type 3 or 4 (2 or 4 Pair) support.

How does the TPS23880RTQT implement reliable PD detection?

The TPS23880RTQT uses "Never Fooled" 4-point detection, sinking two different current levels via DRAINn while measuring VPWR-to-DRAINn voltage across four distinct points to validate PD signature. If port voltage exceeds 2.5 V before detection, a 100-kΩ internal resistor discharges the port capacitor during a 400-ms backoff period. This method is detailed in Section 6.1 and ensures zero false powering events under real-world conditions.

What is the role of the KSENS pins on the TPS23880RTQT?

The KSENSA–D pins provide Kelvin-sense connections for differential voltage measurement across the external 0.255 Ω current sense resistors. KSENSA pairs with SEN1/2, KSENSB with SEN3/4, and so on-enabling accurate current sensing by eliminating PCB trace resistance errors. This architecture achieves 2% current sensing accuracy and is specified in the Pin Functions table and Section 6.1 Detailed Pin Description.

Can the TPS23880RTQT firmware be updated in the field?

Yes, the TPS23880RTQT includes 16 kB of I²C-programmable SRAM that enables in-field firmware upgrades to ensure ongoing IEEE compliance and interoperability with newly released powered devices. This capability is highlighted in the Features list and Description section, and is functionally identical to the SRAM implementation in the pin-compatible TPS23881RTQT and TPS23882RTQT variants.