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DC/DCs supply clean output voltage to portables

Posted: 02 Feb 2007 ?? ?Print Version ?Bookmark and Share

Keywords:DC/DC? PWM? converters? ON Semi? power management?

NCP1523 and NCP1523B DC/DC converters from ON Semi

ON Semiconductor has introduced two new high-performing pulse width modulation (PWM), pulse frequency modulation (PFM) and PWM-only DC/DC converters optimized for portable applications. Supplying clean output voltage with very low ripple and fast transient response, the NCP1523 and NCP1523B are suitable for use in power-sensitive applications such as micro HDDs found in multimedia portable devices.

High power efficiency
The NCP1523 and NCP1523B feature a high switching frequency of 3MHz, which enables the use of a smaller inductor down to 1?H. The devices deliver power efficiencies of up to 93 percent due to synchronous rectification that extends battery life and reduce external part count. To supply power to even the most demanding microprocessor in portable electronics, these new DC/DC converters provide very fast response times. The NCP1523 features automatic switching PWM/PFM modes, which improve system efficiency at a light load. The PWM-only mode, featured in the NCP1523B, offers an efficient load transient solution and low output voltage ripple. Additionally, these new devices offer integrated soft-start, cycle-by-cycle current limiting and thermal shutdown protection.

Performance, size demands
"These new converters address critical performance and size demands for our portable electronics customers," said Hyung-Sup Kim, marketing director of ON Semiconductor's digital consumer products group. "Not only do these NCP1523 devices meet the most stringent power requirements for portable electronics, they provide superior efficiency performance in one of the smallest packages currently offered in the market."

Available in an adjustable output voltage from 0.9V to 3.3V, the NCP1523 and NCP1523B are packaged in the tiny 2.1-by-1.1mm 8-pin Flip-Chip. They are priced at 75 cents per unit in 1,000-unit quantities.

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