This reference design selected the TLV62568 with a 1-A output current and the TLV62569P with a 2-A output current.
The TLV62568/9 is a high-efficiency synchronous step-down converter. The device operates with an adaptive off time with a peak current control scheme. The device typically operates at a 1.5-MHz frequency pulse width modulation (PWM), at moderate to heavy load currents. Based on the VIN/VOUT ratio, a simple circuit sets the required off time for the low-side MOSFET, making the switching frequency relatively constant regardless of the variation of input voltage, output voltage, and load current.
Figure 2-4 shows the functional block diagram of the TLV62568, and as a reference diagram for the TLV62569.