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Power/Alternative Energy??

DC/DC converters boast 200kHz-2.5MHz switching frequency

Posted: 30 Jan 2012 ?? ?Print Version ?Bookmark and Share

Keywords:DC/DC converter? integrated fault protection? switching frequency?

Linear Technology Corp. has introduced a dual independent channel, step-up DC/DC converter with integrated fault protection for output shorts, input/output overvoltages and overtemperature conditions. According to the company, each channel of the LT8582 uses two integrated 42V switches1.7A master switch and 1.3A slave switchthat can be tied together for a total current limit of 3A.

The LT8582 operates from an input voltage range of 2.5-22V with transient protection to 40V, making it suitable for applications with input sources ranging from a single-cell Li-ion to automotive inputs, noted Linear Tech. It is engineered for many local power supply designs as each channel can be independently configured as either a boost, SEPIC, inverting or flyback converter. The combination of a 4 x 7mm DFN package and tiny externals ensures a very compact footprint while minimizing solution cost, added the company.

LT8582

The LT8582 operates from 2.5-22V.

The device's low VCESAT switches, 0.27V (tied together at 2.75A) can deliver efficiencies up to 90 percent, claimed Linear Tech. A power good pin is offered for ease of use when event-based sequencing is required. For high voltage outputs, the LT8582's slave switch enables high power charge pump topologies that are very efficient and require few external components, said the company. The LT8582's switching frequency can be programmed via a single resistor or synchronized to an external clock between 200kHz and 2.5MHz, minimizing external component sizes and avoiding 'noise critical' frequency bands. Undervoltage lockout (UVLO) is user adjustable for optimal system performance. Each channel requires a single feedback resistor to set the output voltage, minimizing external components. Other features include external synchronization capability, output short circuit protection and frequency foldback.

The LT8582EDKD is available at $3.75 each for 1,000 piece quantities. An industrial temperature (-40C to 125C) version, the LT8582IDKD, is priced at $4.13 each for 1,000 piece quantities.





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