LTC3350EUHF#PBF

特殊功能芯片, 4.5V至35V输入, QFN-38

The is a high current supercapacitor Backup Controller and System Monitor can charge and monitor a series stack of one to four supercapacitors. The LTC3350"s synchronous step-down controller drives N-channel MOSFETs for constant current/constant voltage charging with programmable input current limit. In addition, the step-down converter can run in reverse as a step-up converter to deliver power from the supercapacitor stack to the backup supply rail. Internal balancers eliminate the need for external balance resistors and each capacitor has a shunt regulator for overvoltage protection. The LTC3350 monitors system voltages, currents, stack capacitance and stack ESR which can all be read over the I²C/SMBus. The dual ideal diode controller uses N-channel MOSFETs for low loss power paths from the input and supercapacitors to the backup system supply.

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High efficiency synchronous step-down CC/CV charging of one to four series supercapacitors

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Step-up mode in backup provides greater utilization of stored energy in supercapacitors

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14-bit ADC for monitoring system voltages/currents, capacitance and ESR

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Active overvoltage protection shunts

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Internal active balancers, no balance resistors

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Programmable input current limit prioritizes system load over capacitor charge current

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Dual ideal diode PowerPath™ controller

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All N-FET charger controller and PowerPath™ controller