Texas Instruments TPS2383PMRG4

Overview

TPS2383PMRG4 from Texas Instruments is an IEEE 802.3af-compliant Power Sourcing Equipment (PSE) power manager for Ethernet-based PoE mid-span injectors and switches. It manages up to eight PoE ports with controlled di/dt ramp-up/down, 12-bit per-port current/voltage acquisition, dual-color LED status indication, and hardware FAULT interrupt. It operates from a single +48-V supply and supports opto-coupled I²C isolation.

For engineers reviewing the TPS2383PMRG4 datasheet, TPS2383PMRG4 pinout, TPS2383PMRG4 application, or TPS2383PMRG4 equivalent, key selection considerations include IEEE 802.3af discovery/classification compliance, external N-channel MOSFET gate drive capability, 8-port programmable sequencing, 12-bit analog monitoring resolution, and dual SDA lines for ground-isolated I²C control in multi-port PSE systems.

Technical Context

The TPS2383PMRG4 implements a master sequencer with eight independent port state machines, enabling time-multiplexed resource sharing across all ports-including A/D conversion, ramp control, and UV/OV/OC fault detection. Its architecture separates discovery (25-kΩ resistor + capacitive legacy load detection), classification (17.5-V terminal voltage, 12-bit current measurement), and powered-mode operation (controlled 425-mA peak current ramp, real-time 12-bit current/voltage readback).

It uses shared analog resources: one 12-bit A/D converter with 7-µs digital filtering, a common CR ramp capacitor interface, and multiplexed sense paths for RD (discovery), RS (current sense), and port voltage monitoring. Gate drive is delivered via eight open-drain outputs (1G–8G) capable of 10-V swing to fully enhance external N-channel MOSFETs, with fast fault turn-off (<7.5 µs) and configurable timers (1024–32768 CLK periods) for UV/OV/overload responses.

Key Specifications

Pinout & Package

The TPS2383PMRG4 is housed in a 64-pin LQFP (PM) package with exposed thermal pad. Pin functions are validated per TI SLUS559B datasheet, including dedicated analog/digital grounds (AG1, AG2, DG, RG), eight port pairs (1P/1N through 8P/8N), eight gate drivers (1G–8G), eight LED drivers (L1–L8), and dual I²C data paths (SDA_I/SDA_O).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Power Sourcing Equipment applications.

Compared with TPS2383PMRG4, TPS2384PWR offers identical core PSE functionality at lower cost but sacrifices opto-isolation capability, while MAX5974AETJ+ trades port count and telemetry depth for integration and footprint reduction-making TPS2383PMRG4 the optimal choice for scalable, isolated, high-visibility PoE infrastructure.

Availability

TPS2383PMRG4 is available at Aetrix Electronics and suitable for enterprise PoE switches, mid-span injectors, and industrial IoT gateways requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for TPS2383PMRG4 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 power management technologies, with decades of leadership in Ethernet and PoE solutions.

The TPS2383PMRG4 belongs to TI's Power over Ethernet PSE power manager product line, designed specifically for scalable, standards-compliant, multi-port Ethernet infrastructure equipment requiring precise power control, real-time diagnostics, and system-level isolation.

FAQ

What is the primary function of the TPS2383PMRG4 in a PoE system?

The TPS2383PMRG4 serves as a programmable Power Sourcing Equipment (PSE) power manager that discovers, classifies, and safely delivers power to IEEE 802.3af-compliant Powered Devices over Ethernet cabling. It controls up to eight ports using external N-channel MOSFETs, provides 12-bit current/voltage telemetry, and supports opto-isolated I²C communication. The TPS2383PMRG4 ensures compliance with safety and timing requirements while enabling intelligent power budgeting and fault response in switches and injectors.

Does the TPS2383PMRG4 integrate power MOSFETs or require external ones?

The TPS2383PMRG4 does not integrate power MOSFETs; it requires external low-R_DS(on) N-channel MOSFETs for each port's return path switching. Its eight gate drivers (1G–8G) provide up to 10-V output with fast turn-off (<7.5 µs) to fully enhance these FETs. This architecture allows system designers to select MOSFETs optimized for thermal performance, cost, and voltage rating-critical for high-density, high-efficiency PoE systems. The TPS2383PMRG4 itself generates its HV gate supply from the +48-V bus.

How does the TPS2383PMRG4 support system-level ground isolation?

The TPS2383PMRG4 supports system-level ground isolation via dual I²C data lines: SDA_I (input-only) and SDA_O (open-drain output capable of +48-V bus drive). When paired with an opto-coupler, SDA_O can directly illuminate the LED side using the +48-V supply, eliminating the need for isolated DC/DC converters or level shifters. This design maintains signal integrity and safety separation between the controller domain and PoE port domain-essential for multi-chassis or safety-critical installations. The TPS2383PMRG4 datasheet confirms this capability in SLUS559B Section 7.

What are the key timing parameters governed by the CR, CT, and CINT capacitors in the TPS2383PMRG4?

In the TPS2383PMRG4, CR sets the di/dt ramp rate during power-up/down (1.5-V triangular waveform); CT and RT set the internal clock frequency (100–500 kHz) governing state machine timing, A/D integration, and fault timers; CINT integrates the A/D converter signal with a recommended 0.033-µF poly/Teflon capacitor to minimize dielectric absorption error. These three capacitors collectively define critical PoE timing: discovery duration, classification window, ramp slope, and fault timeout intervals-all required for IEEE 802.3af conformance. The TPS2383PMRG4 datasheet specifies exact values and tolerances in Sections 7 and 9.

Can the TPS2383PMRG4 monitor port current and voltage in real time-and how is that data accessed?

Yes, the TPS2383PMRG4 performs real-time 12-bit analog-to-digital conversion of port current and voltage during powered operation. Measurements are stored in per-port read registers accessible via the standard slave I²C interface. Each port's current value (in counts, scalable to ±1 mA resolution) and voltage value (scalable to ±0.1 V resolution) can be polled individually or sequentially. This telemetry supports dynamic power budgeting, fault diagnostics, and remote system health monitoring-without requiring external ADCs or sensors. The TPS2383PMRG4's A/D architecture is detailed in SLUS559B Electrical Characteristics Table and Functional Description Section.