The TPS4022 device is a flexible synchronous buck controller. It can be used as a dual-output controller, or as a two-phase single-output controller. It operates with a wide input range from 4.5 V to 20 V and generates accurate regulated output as low as 600 mV.

In dual output mode, voltage mode control with input feed-forward architecture is implemented. With this architecture, the benefits are less noise sensitivity, no control instability issues for small DCR applications, and a smaller minimum controllable on-time, often desired for high conversion ratio applications.

In two-phase single-output mode, a current-sharing loop is implemented to ensure a balance of current between phases. Because the induced error current signal to the loop is much smaller when compared to the PWM ramp amplitude, the control loop is modeled as voltage mode with input feed-forward.