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12V Input to 5V Outputs High Peak-Power & Backup Supply using Two Supercapacitors with Input Voltage Monitoring 12V Power Ride Through Using Six 10F, 2.7V Supercapacitors in Series with Front End Flyback 3.3V at 1.5A from 5V Peak-Power & Back-up Supply using Two Supercapacitors 5V at 6mA for 9.6s Supercapacitor Backup Supply 5V Backup Supply from Supercap Runs Down to VIN = 2V with 250mA Load Buck-Boost Converter In SuperCap Backup Power Supply Dual Battery Load Sharing with Automatic Switchover to a Wall Adapter Li-Ion Backup Supply Power Backup System Using Supercapacitors Power Backup Using Supercapacitors and Optional Keep-Alive Cell Redundant USB & 3xAA High Peak Power Battery Supplies using Two Supercapacitors SuperCap Backup Power Supercap Powered Backup Supply
The LTC4425 is a constant-current/constant-voltage linear charger designed to charge a 2-cell supercap stack from either a Li-Ion/Polymer battery, a USB port, or a 2.7V to 5.5V current-limited supply. The part operates as an ideal diode with an extremely low 50mΩ on-resistance making it suitable for high peak-power/low average power applications. The LTC4425 charges the output capacitors to an externally programmed output voltage in LDO mode at a constant charge current, or to VIN in normal mode with a smart charge current profile to limit the inrush current until the VIN to VOUT differential is less than 250mV. In addition the LTC4425 can be set to clamp the output voltage to 4.9V or 5.4V.
