Ruggedized PDAs face a critical shortage of power, particularly at low temperatures. The high pulse power needed for the radio frequency transmissions or new display technologies such as OLED can strain existing batteries. This overload situation quickly lowers voltage and triggers premature shut-down (leaving spare energy in the battery), thus decreasing overall communications time and the useful life of the battery.
A supercapacitor can eliminate this problem. Working in tandem with the battery, the supercapacitor discharges its power during peak loads and recharges between peaks, provides the support power needed to operate the PDA for much longer periods, enables memory back up, battery chatter recovery, and battery hot-swapping capabilities, and reduces excessive power load to extend the battery’s life cycle.
Application Note No. 1001
Current-Limit and Low-Voltage Lockout Circuit for Portable Devices (PDF, 120KB)
Application Note No. 1002
Start-Up Current-Limiters for Supercapacitors in PDAs and Other Portable Devices (Rev 2.1) (PDF, 312KB)
Application Brief No. 1004
Battery Run-Time Extension and Low Temperature Boost (PDF, 161KB)
Application Brief No. 1005
Electrolytic and Tantalum Capacitor Replacement (PDF, 75KB)
Application Brief No. 1006
Pulse Load Applications (PDF, 183KB)
Application Brief No 1013
Effect of Supercapacitor Distance from a Load (PDF, 152KB)
Evaluation Board User Manual No. 1002
(PDF, 302KB) Supercapacitor Evaluation Board User Manual for PDAs (PDF, 302KB)