The MFR_SPECIFIC_21 command allows provides two anti-cross conduction delay (dead-time) options for each channel. Bit 0 of this command selects between two dead-time settings for channel 1, and bit 1 of this command selects between two dead-time settings for channel 2. In each case, writing this bit to a 1 selects the longer dead-time option. The particular option required for a given application depends upon several things such as FET total gate charge, FET gate resistance, PCB layout quality, and temperature. The proper setting for a given design is highly application-dependent, however, for FETs above 25-nC gate charge, the longer dead-time setting is generally considered. The shorter dead-time setting allows for higher efficiency in applications where FETs are generally small and switch very quickly. In applications with larger and slower switching FETs, a shorter dead-time leads to small amounts of cross conduction. Conversely, using the longer dead-time settings with smaller, faster switching FETs leads to excessive body diode conduction in the low-side FET, leading to a drop in overall converter efficiency.