8.1 Overview

The TPS23521 is a high performance hot swap controller that enables high power telecom systems to comply with stringent transient requirements. The soft start cap disconnect allows soft start at start-up and disconnects the soft start cap during normal operation. This allows for the use of smaller hot swap FETs without hurting the transient response. GATE2 is a second hot swap FET driver, which only turns ON when the main hot swap FET is fully on. Thus the FETs driven by GATE2 don't need to have strong SOA. This saves space and BOM cost in high power applications that require multiple hot swap FETs.The 400 µA sourcing current allows fast recovery, which helps to avoid system resets during lightning surge tests. The dual current limit makes it easier to pass brown outs and input steps such as required by the ATIS 0600315.2013. Finally, the TPS23521 offers accurate under voltage and over voltage protection with programmable thresholds and hysteresis.