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500mA converter targets small-sized apps

Posted: 12 Jan 2007     Print Version  Bookmark and Share

Keywords:Maxim Integrated Products  MAX8640Y  MAX8640Z  DC-DC converters  SC70 package 

Maxim Integrated Products has introduced the MAX8640Y/MAX8640Z, the industry's smallest 500mA, high-efficiency step-down DC/DC converters in a tiny SC70 package. These devices are suitable for applications where small size, high efficiency and low output ripple are priorities. They utilise a proprietary switching scheme to reduce external component size and draw only 24µA of quiescent current, thus providing light-load efficiency. This combination of small size and high efficiency makes them the industry's optimal solution for generating low-voltage microprocessor core supplies for cell phones, smartphones, digital cameras, and similar portable applications powered by a single-cell Li+ or 3-cell NiMH/NiCd batteries.

Factory-preset output voltages from 0.8V to 2.5V eliminate external feedback-network components.

The high integration of the MAX8640Y/MAX8640Z enables the smallest total solution size-13.4mm2 vs. the conventional 35mm2 of SOT23 solutions. These devices integrate a synchronous rectifier, which eliminates the need for an external diode and improves efficiency, especially at low output voltages. The devices also feature low output ripple at all loads, ultra-fast line- and load-transient response and fast internal soft-start, which eliminates in rush current.

The MAX8640Y/MAX8640Z are available in 2-by-2.1mm SC70 and 1-by-1.5mm microDFN packages. They are specified for the extended temperature range (-40oC to 85oC).

Prices start at Rs.71.61 ($1.58) (1000-up, FOB USA). An evaluation kit is available to speed designs.

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