LTC3643EUDD#PBF

LINEAR TECHNOLOGY  LTC3643EUDD#PBF  芯片, 超级电容充电器, 双向, QFN-24

The is a 2A bidirectional power backup supply in 24 pin QFN package. The LTC3643 is a bidirectional synchronous step-up charger and step-down converter which efficiently charge a capacitor array up to 40V from an input supply between 3V to 17V. When the input supply falls below the programmable power-fail threshold, the step-up charger operates in reverse as a synchronous step-down regulator to power the system rail from the backup capacitor during this power interuption/failure condition. When charging the backup capacitor, an external low-value sense resistor may be used to maintain an accurate current limit from the input supply or implement PowerPath functionality. The step-down converter operates at a 1MHz switching frequency allowingsmall external components to be used. Low quiescent current during regulation maximizes the energy usage from the backup capacitor.

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Wide input voltage range 3V to 17V

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Up to 40V capacitor voltage storage for high energy backup

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2A maximum CAP charge current

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Integrated power N-channel MOSFETs 150mohm top and 75mohm bottom

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Integrated power N-channel MOSFET for output/CAP disconnect 50mohm

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Input current limit during charging

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Fast 1MHz switching frequency

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±1% reference accuracy for system voltage regulation

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Indicator outputs for charge status and input power fail

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Operating temperature range from -40°C to 125°C