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Compact supercap chargers offer auto cell balancing

Posted: 19 Aug 2010     Print Version  Bookmark and Share

Keywords:supercapacitor  charger  2-cell balancing 

 LTC3625/ LTC3625-1 supercapacitor charger

Linear Technology Corp. reveals the LTC3625 and LTC3625-1 2-cell supercapacitor chargers with automatic cell balancing and compact 12mm2 package for addressing high peak power, data backup and �dying gasp� needs in portable and data storage applications.

The 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 over-voltage protection via internal voltage clamps.

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). These ICs are optimised to offer fast capacitor charge times with high efficiency. The combination of high efficiency, high charge current, low quiescent current and low minimum external parts count make the LTC3625/-1 ideal 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 LTC3625 and LTC3625-1 are specified over a -40°C to 125°C operating junction temperature range. They are available in a compact, thermally enhanced, 12-lead, low-profile (0.75mm) 3mm x 4mm DFN package.

Pricing starts at Rs.140.91 ($3) each for E grade and Rs.162.04 ($3.45) each for I grade. Minimum order quantity is 1,000 units.

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