Linear Technology Corporationintroduces the LTC4040, a complete lithium battery backup power management system for 3.5V to 5V supply rails that must be kept active during a main power failure. Batteries provide considerably more energy than supercapacitors, making them superior for applications which require backup for extended periods of time. The LTC4040 uses an on-chip bidirectional synchronous converter to provide high efficiency battery charging as well as high current, high efficiency backup power. When external power is available, the device operates as a step-down battery charger for single-cell Li-Ion or LiFePO4 batteries while giving preference to the system load.
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When the input supply drops below the adjustable Power-Fail Input (PFI) threshold the LTC4040 operates as a step-up regulator capable of delivering up to 2.5A to the system output from the backup battery. During a power fail event, the device’s PowerPath™ control provides reverse blocking and a seamless switchover between input power and backup power. Typical applications for the LTC4040 include fleet and asset tracking, automotive GPS data loggers, automotive telematics systems, toll collection systems, security systems, communications systems, industrial backup and USB-powered devices.
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The LTC4040 is housed in a low profile (0.75mm) 24-pin 4mm x 5mm QFN package with backside metal pad for excellent thermal performance. The device operates from -40 to 125 degrees C, in both E and I grades. The LTC4040 is in stock, and 1,000-piece pricing starts at $2.90 each for the E grade.
source: http://www.powerpulse.net/story.php?storyID=32365
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