Power Supply with Supercapacitor

Renesas' ISL85403 buck-boost regulator is a power supply system with a supercapacitor and a wide input voltage range which supports from 3 V to 40 V with a 2.5 A output. A supercapacitor can be used to replace the traditional battery (with defects such as electrolyte leakage) as a backup power supply.

In boost mode, this regulator can discharge the capacitor energy as much as the present electronic components, which maximizes the use of capacitive energy and helps save cost. When the load is small, the discharge efficiency can be as high as 82% at 100 mA. At high current (1 A output), this design can still achieve over 50% discharge efficiency. The high-performance LDO, high-efficiency MOSFET, and precise voltage supervisor provide the integrated power system solution.