To reduce EMI, the TPS2584x-Q1 introduce frequency spread spectrum. The spread spectrum is used to eliminate peak emissions at specific frequencies by spreading emissions across a wider range of frequencies than a part with fixed frequency operation. In most systems, low frequency conducted emissions from the first few harmonics of the switching frequency can be easily filtered. A more difficult design criterion is reduction of emissions at higher harmonics which fall in the FM band. These harmonics often couple to the environment through electric fields around the switch node. The TPS2584x-Q1 devices use ±6% spread of switching frequencies with 1/256 swing frequency.

The spread spectrum function is only available when using the TPS2584x-Q1 internal oscillator. If the RT/SYNC pin is synchronized to an external clock, the spread spectrum function turns off.