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Charger IC tailored for Lithium battery-powered portable devices

Posted: 25 Nov 2005 ?? ?Print Version ?Bookmark and Share

Keywords:battery charger? Linear Technology? LTC4065L?

The new fully integrated standalone linear battery charger from Linear Technology Corp. charges single coin cell Li-ion batteries up to 250mA without overheating the device or surrounding components. This full-featured LTC4065L IC offers a 4.2V 0.5 percent accurate float voltage, 5 percent charge current accuracy, timer termination and C/10 detection, and is housed in a 2-by-2mm DFN package.

According to the company, a complete solution requires only two discrete components (input capacitor and a charge current program resistor) and fits into a 2.5-by-2.7-by-0.75mm form factor. Its small size and ability to regulate low charge currents make it a suitable solution for applications in small capacity rechargeable Lithium battery-powered portable devices such as MP3 players, wireless headsets and Bluetooth-enabled devices.

The LTC4065L requires no external MOSFET, sense resistor or blocking diode. A patented thermal regulation scheme prevents the junction temperature of the IC from exceeding 115C by reducing charge current during high power or high ambient temperature operation. Other features of the LTC4065L include a charge current monitor output for charge termination, recharge, trickle charging and charge status indication. Charge current is adjustable with a standard off-the-shelf resistor.

The device is designed to work with supplies up to 5.5V, including those within USB specifications and from 5V wall adapters. During shutdown, the supply current is 20?A and battery drain current is less than 1?A, extending battery run time.

The LTC4065L is rated for operation from -40C to 85C. Pricing starts at $1.10 each in 1,000-piece quantities.




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