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Universal charger chips tip 4A charging/system current

Posted: 29 May 2012 ?? ?Print Version ?Bookmark and Share

Keywords:Li-ion battery? charger ICs? I<sup>2</sup>C digital interface?

Summit Microelectronics has released two monolithic 4A Li-ion battery charger ICs, the SMB349 and SMB359. The chips are fully-configurable and can deliver up to 4A charging/system current while accepting a wide +3.6 to +16V input voltage range.

The SMB349 incorporates CurrentPath technology with dual system/battery outputs (for instant-on with discharged or missing battery); and the SMB359 provides a single output. Both products feature the company's FlexCharge automatic power source detection and patented FlexCharge+ automatic input voltage detection technologies to support universal USB/AC battery charging and comply with industry standards such as USB2.0/3.0/BC1.2. They also feature Summit's TurboCharge high-efficiency switch-mode charger, TurboCharge+ automatic float voltage compenzation and OptiCharge automatic input current limit technologies, combined with SafeCharge JEITA/IEEE1725 battery safety support, optimize the solution and provide the industry's fastest, safest battery charging.

Other beneftis of the ICs are an I2C digital interface and non-volatile configuration for host-based control while maintaining the simplicity of standalone operation; CSP packaging; and minimum external components for tiny solution size.

The SMB349/359 are suited for portable applications that use high-capacity batteries, require reliable and fast charging and feature very compact industrial designs. These include smartphones, tablets, ultrabooks, digital camcorders, portable media players, and portable game consoles/controllers.

The SMB349/359 operate with an input range from +3.6V to +16V input and safely withstand continuous input overvoltage up to +20V (non-operating), while protecting downstream circuitry.

They are offered in 2.96mm x 3.16mm, 49-ball, Pb-free CSP and in 5mm x 5mm 40-pin QFN packages. Both products have an operating temperature range of C30C to +85C. Available now in production quantities, the SMB349 and SMB359 are priced at $1.62 and $1.82 for CSP and QFN respectively, each in quantities of 10,000 units.

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