Generally, described herein are embodiments of control schemes for sensor-less operation and detection of CCM and DCM in a switching power converter. In one aspect, embodiments of a controller are described that utilize dual control loops and do not require sensing the inductor current or any current in the converter which eliminates or reduces the challenges and problems associated with current sensing. Advantages of embodiments of methods described herein become more significant when used in ultra high switching frequency converters since embodiments of the controller result in eliminating the need for high-speed low-noise current sensing circuitries, when used in on-chip integrated power converters where sensing accuracy may be a more significant issue compared to on-board power converters, and in power converters with paralleled modules since embodiments of the controller eliminate sensing circuitries in each of the modules.