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Power Management
Supercapacitor Chargers
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Energy Storage
Backup & Holdup Supply
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Energy Storage
Peak Power Buffer
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For the LTC4425 - Linear SuperCap Charger with Current-Limited Ideal Diode and V/I Monitor
12V Input to 5V Outputs High Peak-Power & Backup Supply using Two Supercapacitors with Input Voltage Monitoring 12V to 5V/3.3V High Peak Power Supply using Two Supercapacitors 3 x AA Alkaline to High Peak Power 3.3V at 2A Using Two Supercapacitors 3.3V at 1.5A from 5V Peak-Power & Back-up Supply using Two Supercapacitors Complete Energy Utilization Maximizes Run Time of Supercap Ride-Through Application Embedded Automotive (6V to 36V Input) to 5V/3.3V/1.8V/1.2V Output Peak-Power Controller using Two Supercapacitors High Current USB Battery and Supercapacitors Charger with Power Path Control Li-Ion High Peak Power Battery Buffer Using Two Supercapacitors Redundant USB & 3xAA High Peak Power Battery Supplies using Two Supercapacitors Supercap-Based Power Ride-Through Circuit Maximizes Run Time Using an Energy Scavenging Scheme USB to High Peak Power 3.3V Supply Using Two Supercapacitors
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.
