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2-cell chargers target small, high-peak power systems

Posted: 13 Aug 2010 ?? ?Print Version ?Bookmark and Share

Keywords:supercapacitor? charger?

 LTC3625/ LTC3625-1 supercapacitor charger

Linear Technology Corp. has unveiled its compact LTC3625 and LTC3625-1 supercapacitor chargers highlight automatic cell balancing and a 12mm2 footprint designed for small form factor backup or high peak power systems, USB-powered equipment, industrial PDAs, portable instruments and monitoring equipment, power meters, supercap backup circuits and PC card/USB modems.

The thermally enhanced , 12-lead, low-profile (0.75mm) chargers feature an internal buck converter between VIN and the series capacitor mid-point VMID to regulate the voltage on the bottom capacitor and an internal boost converter between VMID and VOUT to regulate the voltage across the top capacitor. The buck converter's output current is user-programmable and the boost converter's input current is set at 2A. With a 2-inductor configuration, maximum charge current is 1A continuous. The capacitors have overvoltage protection via internal voltage clamps.

The LTC3625 and LTC3625-1 are specified over a -40C to 125C operating junction temperature range. They can charge two supercapacitors in series from a 2.7V to 5.5V current-limited supply to a pin-selectable output voltage (4.8V/5.3V for LTC3625 or 4V/4.5V for LTC3625-1). The combination of high efficiency, high charge current, low quiescent current and low minimum external parts count make the LTC3625/-1 idea

Pricing starts at $3 each for E grade and $3.45 each for I grade. Minimum order quantity is 1,000 units.





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