Texas Instruments TPS23882RTQT

Overview

TPS23882RTQT from Texas Instruments is an 8-channel IEEE 802.3bt Type-3 2-pair Power Sourcing Equipment (PSE) controller with SRAM programmability, 200-mΩ current sense resistor, ±3% programmable power limiting accuracy, and dedicated 14-bit per-port integrating ADCs. It enables PoE 2 power delivery up to 30 W per port in video recorders, small business switches, and campus/branch Ethernet infrastructure.

For engineers reviewing the TPS23882RTQT datasheet, TPS23882RTQT pinout, TPS23882RTQT application, or TPS23882RTQT equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts for PoE 2 PSE migration, and supply support for industrial Ethernet hardware development.

Technical Context

The TPS23882RTQT implements a 4-point PD detection architecture with dual-current sinking on DRAINn pins and VPWR-to-DRAINn voltage measurement to prevent false powering. Its per-port 14-bit integrating ADC supports parallel classification measurements and noise-immune MPS-based DC disconnect.

It uses external N-channel MOSFETs controlled via GAT1–GAT8 outputs, with Kelvin-sense current monitoring across eight 0.200-Ω resistors referenced to KSENSA–KSENSD. Programmable SRAM enables field-upgradable FirmPSE firmware over 8-/16-bit I²C, supporting auto, semi-auto, and manual operating modes.

Key Specifications

Pinout & Package

VQFN-56 (RTQT) package, 8.00 mm × 8.00 mm body size with exposed thermal pad. Requires separate AGND and DGND connections to PCB ground plane and thermal pad for proper analog/digital isolation and thermal management.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PoE 2 PSE controller applications.

Compared with TPS23882RTQT, TPS23881RTQT adds 4-pair capability at higher cost and complexity, while TPS23880RTQT removes SRAM and advanced diagnostics to reduce BOM cost-making TPS23882RTQT the optimal balance of field-upgradability, precision, and 2-pair PoE 2 feature completeness.

Availability

TPS23882RTQT is available at Aetrix Electronics and suitable for video recorder (NVR/DVR), small business switch, and campus/branch switch applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for TPS23882RTQT 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 leader specializing in analog, embedded processing, and connectivity technologies with decades of Ethernet power delivery innovation.

The TPS23882RTQT belongs to TI's PoE 2 PSE controller product line, designed specifically for high-density, thermally constrained 2-pair IEEE 802.3bt infrastructure requiring field-upgradable firmware, precise power metering, and robust fault handling.

FAQ

What is the primary IEEE standard compliance of the TPS23882RTQT?

The TPS23882RTQT is fully compliant with IEEE 802.3bt for Type-3 Power Sourcing Equipment in 2-pair configuration. It supports all mandatory detection, classification, and maintenance power signature (MPS) requirements for PoE 2, including Never Fooled 4-point detection and DC disconnect. It does not support 4-pair operation-this is reserved for the TPS23881RTQT variant. The TPS23882RTQT delivers up to 30 W per port using two data pairs.

How does the TPS23882RTQT achieve accurate current sensing across all 8 ports?

The TPS23882RTQT achieves ±2% current sensing accuracy per port using dedicated 14-bit integrating ADCs and Kelvin-sense architecture. Each pair of current sense inputs (SEN1–SEN8) connects differentially to shared Kelvin reference pins (KSENSA–KSENSD), eliminating PCB trace resistance error. Combined with its 0.200-Ω external sense resistor and internal 2-µs analog filtering, the TPS23882RTQT enables precise real-time current monitoring for power policing, foldback, and telemetry-all without software overhead.

Can the TPS23882RTQT be used in place of the TPS2388 or TPS23881 in existing designs?

Yes-the TPS23882RTQT is pin-to-pin compatible with the TPS2388, TPS23880, and TPS23881 in the VQFN-56 (RTQT) package. Migration requires no PCB layout changes. Key improvements include reduced R_SENSE (0.200 Ω vs. 0.255 Ω), SRAM-based FirmPSE firmware upgradability, enhanced capacitance measurement (1–12 µF), and tighter ±3% programmable power limiting. Firmware and register mapping differ, so configuration software must be updated-but hardware integration is seamless.

What thermal management features does the TPS23882RTQT provide for high-power PoE applications?

The TPS23882RTQT integrates an exposed thermal pad and specifies R_θJB = 3.7°C/W (junction-to-board), enabling efficient heat transfer to the PCB ground plane. Its 0.200-Ω current sense resistor reduces I²R losses versus prior generations, lowering self-heating. Combined with per-port analog foldback that responds in <1 µs during shorts, and a wide –40°C to +125°C operating range, the TPS23882RTQT sustains full 30 W/port operation in thermally constrained enclosures without active cooling-verified in TI's reference designs for NVR and switch platforms.

Does the TPS23882RTQT support legacy PoE (802.3af/at) powered devices?

Yes-the TPS23882RTQT fully supports IEEE 802.3af (PoE) and 802.3at (PoE+) powered devices through backward-compatible detection, classification, and MPS protocols. It includes legacy PD capacitance measurement (1–12 µF range) to distinguish valid PDs from phantom loads, and configurable 2-pair power allocations down to 4 W-matching Class 1–4 requirements. Its 4-point detection and auto-class discovery ensure interoperability with certified PDs from all major vendors without modification.