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Multifunction IC packs battery charger, buck converter

Posted: 19 Jun 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Linear? LTC4080? battery charger? buck converter? power management IC?

Linear Technology Corp. has introduced the LTC4080, a multifunction IC featuring a standalone linear battery charger and a highly-efficient synchronous buck converter.

According to the company, the USB-compatible battery charger can charge a single-cell Li-Ion battery up to 500mA without overheating the device or surrounding components. The 300mA buck converter features selectable mode operation and synchronous rectification to achieve efficiencies up to 96 percent. The device is designed to work with supplies up to 5.5V, including those within USB specifications and from 5V wall adapters. Its 3-by-3mm DFN package ensures a tiny solution footprint for space-constrained, smaller battery capacity powered handheld applications such as wireless headsets, Bluetooth devices, portable MP3 players, and multi-function wristwatches, the company said.

The device's battery charger 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. Linear said this charger offers timer termination, recharge, and C/10 detection. Other features of the device include a charge status indicator, a 4.2V 0.5 percent accurate float voltage, 5 percent charge accuracy, and an open drain AC Present status pin to indicate the presence of an input supply such as a wall adapter. Charge current is adjustable with a standard off-the-shelf resistor. During shutdown, the supply current is only 5A and battery drain current is less than 1A.

Linear said the efficient synchronous step-down converter features a 2.7-5.5V input operating voltage range (powered from the BAT pin) with corresponding output voltage range from 0.8V to VBAT. Burst Mode operation reduces supply current to 23A to maximize light load efficiency, but can be disabled via an external pin in favor of fixed constant frequency (2.25MHz) operation if very low switching noise is required.

The LTC4080 is housed in a 10-lead 3-by-3mm DFN package and is rated for operation from -40C to 85C. Pricing starts at $1.90 each in 1,000-piece quantities.

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Related Datasheets
Part Number Description Category
? LTC4080 500mA Standalone Li-Ion Charger with Integrated 300mA Synchronous Buck ICs, Interface



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