Circuit eases power-sequence testing

摘要

Systems on chip (SOCs) normally require one power supply for the core and another for I/O. To properly apply power to the device, you often need one supply to apply power before the other. The circuit in Figure 1 lets you test the power sequencing of the SOC. Two TPS75501 linear regulators, IC_3 and IC_4, generate two power supplies. The TPS75501 adjustable regulator provides output voltages of 1.22 to 5V from a maximum input of 6V. The circuit uses 5V as the input source, and it can supply as much as 5A.