Texas Instruments TPS2373 High-Power PD Interface contains all of the features needed to implement an IEEE802.3at or IEEE802.3bt (draft) (Type 1-4) powered device (PD). The low internal switch resistance allows the TPS2373-4 and TPS2373-3 to support high-power applications up to 90W and 60W, respectively. Assuming a 100-meter CAT5 cable, this translates into 71.3W and 51W at PD input. The TPS2373 operates with enhanced features. The Advanced Startup function for DC-DC results in a simple, flexible, and minimal system cost solution while ensuring that IEEE802.3bt (draft) startup requirements are met. It helps to reduce the size of the low-voltage bias capacitor considerably. It also allows a long DC-DC converter soft-start period and enables the use of a low-voltage PWM controller.
