A new bypass capacitance, from V_IN to -V_OUT is used to help with load transients. The values for the bypass capacitance, C_IO and C_{IO_HF}, can be chosen using input capacitance recommendations from the buck data sheet, but it is important to note that the voltage across the capacitors will be V_IN + |-V_OUT|. The capacitors used must be appropriately sized for the voltage difference between V_IN and -V_OUT. When the input supply is turned on, the bypass capacitance can cause the output to shortly swing positive before becoming negative. If the desired load is sensitive to a positive swing, then an optional Schottky diode can be placed across the output to clamp the voltage.