SNVSB03D December 2018 – January 2020 TPS3840
A typical application for the TPS3840 is voltage rail monitoring and power-up sequencing as shown in Figure 48. The TPS3840 can be used to monitor any rail above 1.6 V. In this design application, two TPS3840 devices monitor two separate voltage rails and sequences the rails upon power-up. The TPS3840PL30 is used to monitor the 3.3-V main power rail and the TPS3840DL16 is used to monitor the 1.8-V rail provided by the LDO for other system peripherals. The RESET output of the TPS3840PL30 is connected to the ENABLE input of the LDO. A reset event is initiated on either voltage supervisor when the VDD voltage is less than VIT- or when MR is driven low by an external source.