Light-load algorithm improves DC/DC converter efficiency

10th September 2015

Nat Bowers

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Suited for consumer electronics, such as displays, STBs and home audio, the 1.5A AP65101 and 2A AP65201 synchronous DC/DC buck converters have been introduced by Diodes Incorporated. Supplied in a standard pinout, space saving TSOT26 package, the devices achieve maximum continuous current efficiencies up to 97% with improved efficiency at lower loads ensured by an automatic light-load algorithm.

The AP65101 and AP65201 buck converters are designed for low-voltage regulation, especially in distributed power architectures, and operate from 4.5 to 16V inputs while delivering adjustable output voltage from 0.8V up to 80% of V_IN. A low quiescent supply current and integrated high- and low-side switches with low Rds(on) both help to reduce power loss.

The high level of integration and minimal need for external components combined with the small-footprint TSOT26 package provide valuable cost and circuit board space savings. Current-mode operation enables fast transient response and easy loop stabilisation, while programmable soft-start and a 500kHz switching frequency contribute to ease of use.

Protection features, including under-voltage lockout, over-current, over-voltage and over-temperature, help prevent damage to downstream components and stress-induced premature component failure. The device enable pin also has a high voltage tolerance of up to 6V.

The AP65101 is priced at $0.21 each and the AP65201 is priced at $0.25 each, in 1,000 unit quantities.