PBL38630/2QNT

Telecom Overview

The Infineon PBL38630/2QNT is a Subscriber Line Interface Circuit (SLIC) designed for telecommunications equipment. It supports -48 V battery feed with an open-loop voltage of 43 V and includes automatic switching between high and low battery supplies to optimize power dissipation. The device provides loop current limiting up to 45 mA, longitudinal balance exceeding 60 dB, and integrated ring relay drivers. It operates within an ambient temperature range of -40 °C to +85 °C and features programmable transmit gain, overhead voltage, and line current settings.

Telecom Feature Summary

• Integrated dual battery feed system with automatic switching between high and low voltage rails
• Built-in analog overtemperature protection that permits continued transmission during fault conditions
• Programmable DC feed characteristics allowing adjustable loop resistance and current limits
• On-chip ring relay driver output capable of driving external relay coils

Telecom Applications

• Basic functionality Central Office Line cards
• Digital Loop Carrier (DLC) systems
• PBX and terminal adapter line interface modules

Telecom Procurement Notes

Verify the specific package suffix against the datasheet table: 'QN' corresponds to the 28-pin PLCC (P-/PG-LCC-28-3). Confirm that the component revision matches Rev. 2.0 specifications. Ensure the ordering part number aligns with the required pin configuration and thermal performance requirements for the target application environment.

Telecom Selection Notes

Select this SLIC when designing interfaces requiring robust longitudinal signal suppression and flexible loop feeding configurations. Consider the 28-pin PLCC package if higher thermal dissipation capabilities are needed compared to the 24-pin SSOP or PDSO options. Verify compatibility with the intended CODEC filter network, such as the SiCoFi series, for proper two-wire to four-wire conversion.

Telecom Part Context

The PBL 38630/2 belongs to the FlexiSLIC family of subscriber line interface circuits from Infineon Technologies. This product line is engineered to provide cost-effective and flexible solutions for connecting analog telephone lines to digital processing systems. The QNT designation specifically identifies the plastic leaded chip carrier package variant within this series.

Telecom Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation.