Do all LDOs have a minimum output load requirement? Not the LT17xx, LT19xx, LT300x, LT302x nor VLDO families. What will the PSRR of my LDO look like at high frequency (1MHz and up)? This is a function of the output capacitor network.These frequencies are beyond the loop bandwidth of the LDO. The loop is no longer in control of the PSRR. Instead, the LDO forms an impedance divider with the pass element and the output capacitor network and load. Because of this, the major component that controls PSRR that can be adjusted is the output capacitor network.