7.3.2 Frequency Select Pin (FREQ)

The switching frequency of the device is set using the frequency select pin (FREQ) to 650 kHz (FREQ = low) or 1.2 MHz (FREQ = high). Higher switching frequency improves load transient response but slightly reduces the efficiency. Another benefit of higher switching frequency is a lower output ripple voltage. Unless light load efficiency is a major concern, TI recommends using a 1.2-MHz switching frequency.