Renesas has introduced the ISL85403 buck-boost regulator, a power supply system that uses a supercapacitor as a backup power supply. This design eliminates the use of traditional batteries, which can have defects such as electrolyte leakage. The ISL85403 supports a wide input voltage range from 3 V to 40 V with a 2.5 A output.
The buck-boost regulator is designed to maximize the use of capacitive energy by discharging the capacitor energy as much as the present electronic components in boost mode, which helps save cost. The discharge efficiency can be as high as 82% at 100 mA when the load is small. Even at high current (1 A output), this design can still achieve over 50% discharge efficiency.
The ISL85403 also features a high-performance LDO (low-dropout regulator), a high-efficiency MOSFET, and a precise voltage supervisor, providing an integrated power system solution. The supercapacitor-based power supply system offers advantages such as longer lifetime, higher reliability, and faster charging/discharging compared to traditional battery-based systems.
In summary, Renesas' ISL85403 buck-boost regulator uses a supercapacitor as backup power supply, supporting a wide input voltage range and high discharge efficiency. This design eliminates the use of traditional batteries, offering advantages such as longer lifetime and higher reliability. The integrated power system solution features a high-performance LDO, high-efficiency MOSFET, and precise voltage supervisor.
The ISL85403 can fully extract the power of a supercapacitor (can be as low as 0.3 V)
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