ADI offers Power by Linear LTC4041, a complete supercapacitor backup power management system for 2.9V to 5.5V power rails that must remain active throughout the main power failure. Supercapacitors have a higher power density than batteries, which makes them ideal for systems that require high peak power backup for short periods of time.
This device uses an on-chip bidirectional synchronous converter to provide efficient step-down supercapacitor charging, as well as high-current, high-efficiency boost backup power supplies. When external power is available, the device can act as a step-down battery charger for one or two supercapacitor batteries, while prioritizing system load. When the input power drops below an adjustable PFI threshold, the device switches to boost regulator operation, which can generate up to 2.5A from the supercapacitor for the system load. During a power failure event, the device's PowerPath control provides reverse blocking and seamlessly switches from input power to backup power. Typical applications for this device include through-type "dying breathing" power supplies, high-current through-type 3V-5V UPS, power meters, industrial alarms,
