A high efficiency input current-limited buck-boost supercapacitor charger has been released by Linear Technology with active charge balancing for 1 or 2 series supercapacitors. The LTC3128 has an average input current limit that can be programmed up to 3A with +/-2 percent accuracy, preventing power source overload while minimising capacitor recharging.
The device features active charge balancing reducing dissipative external ballast resistors, ensuring balanced operation and charging with mismatched capacitors, and less frequent recharge cycles.
Design features include a programmable maximum capacitor voltage clamp that monitors and enforces the voltage across each capacitor in the series stack, this ensures reliable operation in case of mismatched capacities.
The low noise buck-boost topology allows the output supercapacitor to be charged whether above or below the input.
The low-RDS(on), low gate charge synchronous switches provide high efficiency conversion to minimise the charging time of storage elements.
Linear Technology
www.linear.com
www.linear.com/product/LTC3128
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