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Power manager services LiFePO4 batteries

Posted: 04 Aug 2010 ?? ?Print Version ?Bookmark and Share

Keywords:power manager? diode controller? battery charger? LiFePO4 batteries?

Linear Technology Corp. announces an autonomous power manager, diode controller and battery charger for 1-cell Lithium Iron Phosphate (LiFePO4) batteries that are used in portable devices such as industrial meters, media players, digital cameras, PDAs, personal navigators, and high peak-power and safety critical equipment.

The LTC4098-3.6's switching topology features PowerPath control, which manages power distribution from multiple sources, including 5V wall adapter, USB and a LiFePO4 battery, while preferentially providing power to the system load. For automotive and other high voltage applications, the LTC4098-3.6 can interface with a Linear Technology external switching regulator to provide a high efficiency high voltage power path. The onboard switching regulator can automatically limit its input current for USB compatibility. Both the low voltage input and the high voltage interface feature Bat-Track optimized charging to provide maximum power to the application and reduced heat in high power density applications with input supplies from 5V to as high as 38V (60V absolute maximum).

The device provides an overvoltage protection circuit up to 66V on the low voltage input, requiring only an external NFET/resistor combination thereby preventing damage caused by accidental application of high voltage. It's "instant-on" operation ensures system load power at plug-in, even with a fully discharged battery. Its onboard ideal diode guarantees that ample power is always available to VOUT even if there is insufficient power at the input. The LTC4098-3.6's ideal diode controller can be used to drive the gate of an optional PFET, reducing impedance to the battery to 30m or less.

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