Highly integrated 2.5A backup power manager boosts efficiency

ANALOG DEVICES Power by Linear LTC4041 complete supercapacitor backup power management system for 2.9V to 5.5V supply rails that must be kept active during a main power failure. Supercapacitors have higher power density than batteries, making them suitable for systems requiring high peak power backup for short periods of time. Devices uses an on-chip bidirectional synchronous converter to provide high efficiency step-down supercapacitor charging, as well as high current, high efficiency boost backup power. When external power is available, the device operates as a step-down battery charger for one or two supercapacitor cells while giving preference to the system load. When the input supply drops below the adjustable power-fail input (PFI) threshold, device switches to step-up regulator operation, capable of delivering up to 2.5A to the system load from the supercapacitor.