Texas Instruments TPS2383BPM

Overview

TPS2383BPM from Texas Instruments is an IEEE 802.3af-compliant Power Sourcing Equipment (PSE) power manager IC for Ethernet-based PoE mid-span injectors and switches. It supports up to eight independent PoE ports, performs two-point 25-kΩ discovery and capacitive legacy load detection, delivers controlled di/dt ramp-up/down, and integrates 12-bit per-port current/voltage acquisition with I²C slave interface. It enables safe, standards-compliant power delivery to powered devices over category-5 cabling.

For engineers reviewing the TPS2383BPM datasheet, TPS2383BPM pinout, TPS2383BPM application, or TPS2383BPM equivalent, this device is selected for high-density, programmable PoE infrastructure where precise port-level monitoring, fault protection (UVLO, OV/UV, overcurrent), and opto-isolated I²C control are required in industrial and enterprise switching systems.

Technical Context

The TPS2383BPM 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 loops - while maintaining independent per-port state machines for discovery, classification, power ramping, and fault response. Each port uses external N-channel MOSFETs switched via dedicated gate drivers (1G–8G) with HV gate drive up to 10 V.

It features dual SDA lines (SDA_I/SDA_O) supporting opto-coupled I²C isolation, five address pins (A1–A5) enabling up to 32 devices on one bus, and hardware FAULT interrupt (INTB) for real-time fault reporting. All operations - including bypass modes for discovery/classification - are controlled via register read/write over standard slave I²C at up to 400 kHz.

Key Specifications

Pinout & Package

TPS2383BPM is housed in a 64-pin LQFP (PM) package with exposed thermal pad, rated for −40°C to +85°C ambient operation. Pin functions are validated per TI SLUS565F datasheet, with dedicated analog/digital grounds (AG1, AG2, DG, RG), dual I²C data paths (SDA_I/SDA_O), eight port gate drivers (1G–8G), and per-port sense/return terminals (1P/1N, 1RS, etc.).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS2383BPM, TPS23861RGET trades multi-port scalability and rich telemetry for integration and footprint reduction, while MAX5982AETM+ offers higher voltage robustness at the cost of TI ecosystem compatibility and register-level firmware reuse.

Availability

TPS2383BPM is available at Aetrix Electronics and suitable for enterprise PoE switches, industrial mid-span injectors, and smart building controllers requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.

Supply support for TPS2383BPM 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 headquartered in Dallas, Texas, designing and manufacturing analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.

The TPS2383BPM belongs to TI's Power over Ethernet (PoE) PSE portfolio, engineered specifically for high-density, programmable Ethernet infrastructure where standards compliance, per-port diagnostics, and flexible control architecture are critical.

FAQ

What is the primary function of the TPS2383BPM in a PoE system?

The TPS2383BPM serves as a programmable Power Sourcing Equipment (PSE) power manager IC that discovers, classifies, and safely delivers power to IEEE 802.3af-compliant Powered Devices (PDs) over Ethernet cabling. It manages up to eight ports with integrated fault protection, per-port current/voltage monitoring, and I²C-controlled sequencing - making it central to mid-span injectors and enterprise switches. The TPS2383BPM enables full compliance while supporting legacy load detection and customizable power policies.

Does the TPS2383BPM require external MOSFETs, and why?

Yes, the TPS2383BPM requires external low-side N-channel MOSFETs connected to its gate driver pins (1G–8G). This architecture allows system designers to select MOSFETs optimized for R_DS(on), voltage rating, and thermal performance - critical for high-efficiency, high-port-count PoE systems. The TPS2383BPM generates its own HV gate drive (up to 10 V) from the 48-V supply, ensuring full enhancement of cost-effective, discrete FETs. The TPS2383BPM does not integrate power switches, preserving flexibility and thermal manageability.

How does the TPS2383BPM support system-level isolation in PoE designs?

The TPS2383BPM supports system-level isolation via dual I²C data lines: SDA_I (input) and SDA_O (open-drain output). SDA_O can directly drive opto-coupler LEDs from the 48-V bus using an external current-limiting resistor, enabling galvanic isolation between the ground-referenced microcontroller and PoE ports. This eliminates noise coupling and meets safety standards like IEC 60950 SELV without additional level-shifters. The TPS2383BPM maintains full functionality - including register access and interrupt signaling - across isolated domains.

Can the TPS2383BPM operate without a 5-V supply, and what are the implications?

The TPS2383BPM requires three supplies: V48 (44–57 V), VL (3.3 V), and V5 (5 V). While V48 and VL are mandatory, V5 may be omitted only if LED drivers (L1–L8) are unused - since V5 powers both the LED outputs and internal analog circuits like the A/D reference. Omitting V5 disables per-port LED status indication and degrades A/D accuracy due to missing analog rail. For full functionality including telemetry and visual status, V5 must be supplied. The TPS2383BPM cannot operate correctly without V5 in production PoE systems.

What fault conditions does the TPS2383BPM detect and report per port?

The TPS2383BPM detects and reports per-port faults including input undervoltage lockout (UVLO below 30–38 V), port overvoltage (OV > 56–63 V), port undervoltage (UV < 40–44 V), average overcurrent (exceeding 20–160 mA thresholds), average undercurrent (<10 mA), and electronic circuit breaker activation. Faults trigger the open-drain INTB pin and set corresponding bits in per-port read registers. The TPS2383BPM automatically disconnects the port via gate driver shutdown and holds fault status until cleared by host MCU - ensuring safe, observable failure handling in mission-critical PoE infrastructure.