TPS23841PJD

Overview

The TPS23841PJD is a quad-channel Power Sourcing Equipment (PSE) controller from Texas Instruments, compliant with the IEEE 802.3af standard. It operates on a single 48V supply and features integrated high-side switches with a maximum on-resistance of 1.8 ohms and a current limit of 650 mA per channel. The device utilizes four independent 15-bit analog-to-digital converters for precise monitoring of port resistance, voltage, current, and internal temperature. It supports automatic, semi-automatic, and power management modes, ensuring robust performance across an operating temperature range of -40°C to +125°C.

Feature Summary

• Integrates four independent power switches with built-in current sensing resistors, eliminating external components for each port.
• Provides comprehensive digital monitoring via four dedicated 15-bit ADCs for real-time measurement of voltage, current, resistance, and thermal conditions.
• Supports multiple operational modes including automatic detection, semi-automatic control, and full power management for flexible system integration.

Applications

• IEEE 802.3af compliant PoE midspan injectors
• PoE-powered end devices requiring strict power management
• Industrial Ethernet infrastructure equipment

Procurement Notes

Verify the specific suffix PJD confirms the HTQFP-64 package variant with exposed pad configuration. Ensure compatibility with the required I2C interface speed and confirm that the 650mA current limit meets the load requirements. Cross-reference the datasheet revision to validate the supported operational modes and protection features against the target application specifications.

Selection Notes

Select this component when designing systems requiring integrated switch management for four PoE ports under the 802.3af standard. It is suitable for applications needing precise digital feedback through high-resolution ADCs. Consider the thermal performance of the HTQFP-64 package and the need for external I2C pull-up resistors if utilizing the communication interface for system control.

Part Context

This part belongs to the TPS2384 family of PoE controllers, which are designed to simplify the implementation of powered device power sourcing equipment. The family shares core functionalities such as IEEE 802.3af compliance and multi-mode operation, differing primarily in package options and specific electrical characteristics like current limits and switching thresholds.

Replacement Considerations

The TPS23841PAPR serves as a pin-compatible alternative within the same series, offering identical functionality but in a different package configuration. Verify that the thermal dissipation requirements of the design can be met by the alternative package type before substitution.