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Battery charger provides instant-on power

Posted: 20 May 2009     Print Version  Bookmark and Share

Keywords:battery charger  USB charging  instant-on power  USB On-the-Go 


Summit Microelectronics has expanded its third-generation programmable battery charger IC family with the introduction of the SMB329.

The SMB329 integrates additional features, such as "instant-on", even with a dead battery, and real-time charge current monitoring. Like its predecessors, the SMB329's parameters are programmable in non-volatile memory for power-up configuration, and in volatile memory for in-system adjustments via the I2C host interface.

In addition, high-efficiency switch-mode operation and TurboCharge mode allow for thirty to fifty per cent shorter charging times, while reducing thermal dissipation and wasted power by 80%. The SMB329 supports all relevant interface (USB2.0, USB OTG, USB charging, etc.) and safety (IEEE1725, JICS8714, etc.) standards, resulting in reduced development time and cost associated with system compliancy efforts.

The SMB329 supports the industry's environmental and green efforts by enabling universal USB charging, eliminating electronic waste while dramatically reducing energy usage.

The SMB329 is based on a 3MHz, switch-mode architecture, with minimal external components, which allows for very efficient power delivery and extremely compact solution size. High-efficiency operation enables fast charging due to higher output/charge currents, while reduced thermal dissipation improves user comfort and system reliability. Summit's proprietary TurboCharge patent-pending technology enables high charge current, even from relatively low-power sources (example: up to 750mA output from 500mA USB source). As consumer devices continue to employ larger batteries, the SMB329 reduces charge time for consumer convenience.

The SMB329 provides 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.

The SMB329 provides instant-on power from the input source to critical system components, allowing them to wake-up and perform system functions, even with a deeply discharged (dead), or missing battery. The SMB329 provides integrated instant-on operation, improving consumer convenience without the cost and size penalty of alternate implementations. The SMB329 also allows the host to directly measure charge current in real-time, thereby allowing the system to recognise the operating mode it is in, and making necessary adjustments for increasing battery life, monitoring for safety and communicating information to the user. The SMB329's Power Source Detection and Automatic Input Current Limit (patent pending) ensure that the charge current is safely and dynamically optimised regardless of power source capability (USB or AC/DC). The resulting improved user experience translates into fewer service calls, fewer merchandise returns and increased subscriber revenue for wireless carriers.

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