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Switch-mode battery chargers with programmable JEITA support offer safety benefits

May 04, 2010 | Paul Buckley | 222900887
Switch-mode battery chargers with programmable JEITA support offer safety benefits Summit Microelectronics has expanded its third-generation programmable battery charger integrated circuit family for single-cell Li-Ion, Li-Polymer, and Li-FePO4 powered systems.
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The SMB328A and SMB328B integrate the largest feature set in the industry, including compatibility with all relevant industry standards: USB 2.0 Specification, USB On-The-Go Supplement, JEITA Safety Guidelines, IEEE1725 Standard, Chinese USB Charging Specification, and others. Both products incorporate innovative functionality that allows automatic matching between the AC/DC adaptor's current capability and the portable device's charging requirements.

High-efficiency operation allows for higher, continuous charging current levels, thereby ensuring battery charging even during high system load conditions. Like all Summit's solutions, digital, non-volatile programmability provides design and system flexibility at no additional cost.

The SMB328A and SMB328B enable companies to create slim industrial designs with faster charging times; two valuable differentiating factors for smart phones and other portable consumer products.

The devices are based on a 3MHz, switch-mode architecture, with minimal external components, which results in efficient power delivery and compact solution size. The SMB328A allows for I2C control of parametric and functional performance, while the SMB328B operates in a GPIO-controlled configuration. Summit's proprietary TurboChargeT patent-pending technology is incorporated in both devices, enabling highest charging current levels (up to 750 mA from 500 mA USB source) from current-limited input power sources.

Like all products in Summit's 3rd generation family, the products provide the means to accomplish true, universal USB charging and to meet the various USB industry standards, without the need for additional hardware and software support. Automatic Input Current Limit (patent pending) detects the maximum current capability of the AC/DC adapter (can be as low as 300 mA for Chinese chargers to more than 1.5A per USB charging specification) and automatically programs the device's input current limit accordingly.
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