voltage power regulation in digital TVs, monitors and other high-density,

fast changing point-of-load system architectures. Employing adaptive constant on-time (AdCOT) control, the AP65450, AP65452 and AP65552 ensure high DC output accuracy, high efficiency and fast transient response.

For the 4A-rated AP65450 converter, the AdCOT control supports seamless

transition between a continuous conduction mode (CCM) at high loads to a

discontinuous conduction mode (DCM) at light loads. The 4A AP65452 and 5A AP65552 variants are designed to remain in CCM in order to help achieve better system noise reduction and filtering.

By providing up to 92% efficiency, the converters help simplify compliance with regional low-power consumption regulations, with the added option of automatic light loading to further improve performance. Additionally, their wide 4.5V to 18V operating voltage range is well-suited for 5V, 9V and 12V bus systems.

The devices feature a high switching frequency of 650kHz: fixed for the AP65452 and AP65552 and variable for the AP65450 under low-load conditions. This feature, combined with AdCOT control, allows for the use of fewer and smaller external inductive and capacitive components, thus enabling designers to achieve good output stability while shrinking PCB size. To further save space, the three devices are provided in the compact SO-8EP package.