# Regular Meeting (2023.1.8) ## New 48 fanout board ![](https://i.imgur.com/1twwcwG.png) * Design: Finished * Remaining Power(Capacitor) should be verify * Power IC has Min and Max capacitor (even resistor is necessary) for stability * [LP5907](https://www.ti.com/lit/ds/symlink/lp5907.pdf) * 250 mA output current * Input Capacitor: No limited * Output Capacitor: 1 ~ 200uF * **Added Resistor for stability: 500m OHM** * [ESR](https://en.wikipedia.org/wiki/Equivalent_series_resistance) * [Some old-fashion regulator needs ESR for stabality](https://electronics.stackexchange.com/questions/557056/why-recommend-tantalum-over-ceramic-capacitor-for-voltage-regulator) * No Soft-Start * [TPS7A20](https://www.ti.com/lit/ds/symlink/tps7a20.pdf) * 300 mA output current * Input Capacitor: No limited * Output Capacitor: 1 ~ 200uF (limited by soft-start capacitor) * Soft-Start * DT is too long from Mouser/Digikey (Ask other shopes) * [ADP125](https://www.analog.com/media/en/technical-documentation/data-sheets/adp124_125.pdf) * 500 mA output current * Input Capacitor: 1 uF * Output Capacitor: 1 uF (limited by soft-start capacitor) * **Added Resistor for stability: 1m ~ 1 OHM** * Soft-Start * Stating layout * Ensure OPAs power input [MAX/MIN]capacitor ###### tags: `Regular Meeting` `DeWei`