LTC3128EUFD#PBF

LTC3128 is a highly efficient, buck-boost DC/DC supercapacitor charger. It operates efficiently from input voltages above, below or equal to the output voltage. It incorporates accurate programmable average input current limit, active charge balancing and programmable maximum capacitor voltage. This combination of features makes the device ideal for safely charging and protecting large capacitors in backup power systems. The input current limit and maximum capacitor voltage are each programmed using a single resistor. Average input current is accurately controlled over a 0.5A to 3A programmable range while the individual maximum capacitor voltage can be set from 1.8V to 3V. It is widely used in application such as supercapacitor based backup power, memory backup, servers, RAID, RF systems, industrial, communications, computing etc.

• 2% accurate average input current limit programmable upto 3A
• Programmable maximum capacitor voltage limit
• Active charge balancing for fast charging of unmatched capacitors
• Charges single or stacked capacitors, power-good comparator
• Input voltage range is 1.73V to 5.5V, power failure indicator
• Output voltage range is 1.8V to 5.5V
• VOUT quiescent current (UVLO) is 2µA maximum
• Output disconnect in shutdown: <lt/>1µA IQ shutdown
• Operating temperature is -40°C to 125°C
• Package style is 20-lead plastic QFN

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