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Power/Alternative Energy??

New power management system IC tailored for portable apps

Posted: 24 Jan 2005 ?? ?Print Version ?Bookmark and Share

Keywords:linear technology? ltc3456? power management system ic?

Linear Technology Corp. rolled out a complete power management system IC designed for portable applications powered by dual cell alkaline/NiCad/NiMH batteries, USB or wall adapter.

The new LTC3456 delivers up to 150mA to a fixed 3.3V Main output and up to 200mA to an adjustable (VBATT to 0.8V) Core output to power microprocessors, microcontrollers and their peripheral circuitry. In addition, this device provides a 3.3V, 50mA Hot Swap output for flash memory cards and an always-alive VMAX to power a real-time clock.

The LTC3456 also has onboard voltage detectors to monitor the status of the wall adapter and USB voltages, as well as a unique control scheme, ensuring seamless transition between battery, USB and wall adapter input power sources. Integrated power sequencing ensures that the Main and Hot Swap outputs always come up after the Core output. The Main and Core 1MHz switching regulators employ synchronous rectification to deliver efficiencies over 90 percent. The chip also has a low battery indicator and a feature to ensure that all outputs are discharged to ground in shut down mode.

Packaged in a 24-pin, 4-by-4mm QFN-14, the LTC3456 is available from stock, with pricing starting at $3.95 each for 1,000-piece orders.




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