Texas Instruments TPS2383BPMR

Overview

TPS2383BPMR from Texas Instruments is a Power Sourcing Equipment Power Manager (PSEPM) compliant with IEEE 802.3af PoE standard, designed for mid-span injectors and Ethernet switches. It supports eight independent PoE ports, delivers up to 425 mA per port with controlled di/dt ramp, integrates 12-bit A/D acquisition for port current/voltage, and features dual-color LED drivers and hardware FAULT interrupt.

For engineers reviewing the TPS2383BPMR datasheet, TPS2383BPMR pinout, TPS2383BPMR application, or TPS2383BPMR equivalent, key selection considerations include IEEE 802.3af discovery/classification compliance, external N-channel MOSFET gate drive capability, I²C slave interface with 5-bit address selectability, opto-coupler-compatible SDA/SCL lines, and per-port fault detection with UV/OV/overcurrent monitoring.

Technical Context

The TPS2383BPMR implements a master sequencer architecture that cycles through eight ports using shared analog resources including a single 12-bit A/D converter, ramp control circuitry (CR/CT/CINT), and discovery/classification voltage comparators. Each port has dedicated state machines for discovery, classification, power-up, and fault response.

It uses external N-channel MOSFETs switched via high-voltage gate drivers (up to 10 V) referenced to the 48-V bus, with current sensing via 0.5-Ω resistors and precision 25-kΩ resistor discovery. Classification occurs at 17.5 V with 12-bit resolution, and real-time port monitoring includes voltage (40–63 V range), current (0–425 mA), and resistance/capacitance measurements.

Key Specifications

Pinout & Package

The TPS2383BPMR is housed in a 64-pin LQFP (PM) package with exposed thermal pad. Pin functions are defined per TI SLUS565F datasheet, supporting eight PoE ports, analog sensing, I²C communication, LED driving, and system timing/control.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS2383BPMR, TPS23861RGET reduces external component count but lacks multi-port scalability, while MAX5984AEUI+ adds PoE+ capability at the cost of higher complexity and price-making TPS2383BPMR optimal for cost-sensitive, eight-port IEEE 802.3af systems requiring external FET flexibility and precise telemetry.

Availability

TPS2383BPMR is available at Aetrix Electronics and suitable for mid-span injectors, managed Ethernet switches, industrial network hubs, and smart building controllers requiring stable component supply and long-term lifecycle support.

Supply support for TPS2383BPMR 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 TPS2383BPMR belongs to TI's Power over Ethernet PSEPM product line, engineered specifically for scalable, standards-compliant Ethernet infrastructure that demands precise per-port power control, real-time telemetry, and robust fault handling in multi-port systems.

FAQ

What is the primary function of the TPS2383BPMR in a PoE system?

The TPS2383BPMR serves as a Power Sourcing Equipment Power Manager (PSEPM) compliant with IEEE 802.3af. Its core function is to safely discover, classify, and deliver 48-V power to up to eight Powered Devices (PDs) over Ethernet cabling. It performs real-time per-port current and voltage monitoring via integrated 12-bit A/D conversion, manages external N-channel MOSFETs for power switching, and provides hardware fault signaling through the INTB pin. The TPS2383BPMR enables full PoE infrastructure control without requiring an integrated power switch.

Does the TPS2383BPMR support both IEEE 802.3af and IEEE 802.3at (PoE+) standards?

No, the TPS2383BPMR is certified only for IEEE 802.3af (Type 1) PoE compliance, supporting up to 15.4 W per port. It does not meet IEEE 802.3at (PoE+) requirements, which mandate higher power delivery (up to 30 W), extended classification, and additional safety mechanisms. For PoE+ applications, TI recommends alternatives such as the TPS23881 or third-party equivalents like the MAX5984AEUI+, both of which explicitly support 802.3at. The TPS2383BPMR remains ideal for cost-optimized 802.3af deployments where external FET selection and fine-grained telemetry are priorities.

How does the TPS2383BPMR handle legacy (non-802.3af) devices?

The TPS2383BPMR supports legacy device detection via capacitive load identification. Instead of relying solely on the 25-kΩ resistance signature required by IEEE 802.3af, it uses its integrated 12-bit A/D converter to measure the load's capacitance during discovery mode. This allows safe probing of older or proprietary devices that lack the standardized resistor network. When enabled via register configuration, this mode prevents misclassification or rejection of valid equipment while maintaining compatibility with compliant PDs. The TPS2383BPMR also permits bypassing classification entirely for faster power-up in fixed-load scenarios.

What external components are required for basic TPS2383BPMR operation?

Essential external components for the TPS2383BPMR include: eight N-channel MOSFETs (one per port) with appropriate R_DS(on) and voltage rating; eight 0.5-Ω Kelvin-connected current-sense resistors; one 665-Ω discovery resistor (RD); one 120-kΩ bias resistor (RT); 0.1-µF CR and CT capacitors; 0.033-µF CINT capacitor; decoupling capacitors on V48, V5, VL, and V10; and dual-color LEDs for L1–L8. Optional components include self-resetting PTC fuses on the 48-V line and opto-couplers for isolated I²C communication using the SDA_O pin.

Can multiple TPS2383BPMR ICs be controlled from a single microcontroller?

Yes, up to 32 TPS2383BPMR devices can share a single I²C bus using their five address-select pins (A1–A5), enabling control of up to 256 PoE ports from one master controller. Each TPS2383BPMR responds only to its unique 5-bit I²C address, and all register reads/writes are performed per-port via dedicated command and status registers. TI's reference design demonstrates this scalability using an MSP430 microcontroller, and the TPS2383BPMR evaluation board (TPS2383A/BEVM-001) validates operation in multi-IC configurations with synchronized sequencing and fault reporting.