LTC3643EUDD#PBF
数据手册.pdfLINEAR 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