The TPS62850x has two operating modes: forced PWM mode is discussed in this section and PWM/PFM as discussed in Section 9.4.2.
With the MODE/SYNC pin set to high, the TPS62850x operates with pulse width modulation in continuous conduction mode (CCM). The switching frequency is either defined by a resistor from the COMP pin to GND or by an external clock signal applied to the MODE/SYNC pin. With an external clock applied to MODE/SYNC, the TPS62850x follows the frequency applied to the pin. In general, the frequency range in forced PWM mode is 1.8 MHz to 4 MHz. However, the frequency needs to be in a range the TPS62850x can operate at, taking the minimum on-time into account.