SLUSBX9I March 2014 – July 2019 TPS23861
The recommended VDD supply voltage requirement is 3.3 V, ±0.3 V. Each TPS23861 requires approximately 5 mA typical and 6 mA maximum from the VDD supply. The VDD supply can be generated from VPWR with a linear regulator (TPS7A4001) for single TPS23861/Auto Mode based PSE or a buck-type regulator (LM5007 or LM5019 based) for a higher port count PSE using multiple TPS23861 devices operating in Auto or Semi-Auto Modes.
The power supply design must ensure the VDD rail rises monotonically through VUVDDR without any droop below VUVDDF as the loads are turned on. This is accomplished with proper bulk capacitance across the VDD rail for the expected load current steps over worst case design corners. Furthermore, the combination of decoupling capacitance and bulk storage capacitance must hold the VDD rail above the UVLO_fall threshold during any expected transient outages once power is applied.