Issue link: https://iconnect007.uberflip.com/i/1441485
JANUARY 2022 I DESIGN007 MAGAZINE 59 removes the majority of the uncompensated voltage drop. Some chips have sense-point connection pins, which route out sensitive silicon areas so that we can connect to them the voltage regula- tor's sense line, thus removing the uncompen- sated voltage drop all the way to the targeted silicon cells. is case is shown in Figure 5. ere is one more case worth mentioning. Sometimes the switching regulator's output ripple is too big for a sensitive load and low- ering the switching ripple magnitude just by adding more capacitance on the regulator's output is not a good option. In such cases, a downstream linear regulator or a series LC filter may be the best solution. Figure 6 shows this case. e LC filter usually adds to the DC voltage drop, so we may need to connect the regulator's sense point further downstream aer the LC filter. In all these cases, the lowering of the uncom- pensated DC drop comes with a potential Figure 4: Voltage regulator with sense connection at the board-package interface. Figure 5: Voltage regulator's sense point connected to the load's sense line allows the removal of the entire uncompensated voltage drop. Figure 6: Power distribution network with a single-stage LC filter to reduce the switching ripple of the regulator.