LTC3225 pdf

The LTC®3225 is a programmable supercapacitor charger
designed to charge two supercapacitors in series to a
fi  xed output voltage (4.8V/5.3V selectable) from a 2.8V/3V
to 5.5V input supply. Automatic cell balancing prevents
overvoltage damage to either supercapacitor. No balancing
resistors are required.
Low input noise, low quiescent current and low external
parts count (one fl  ying capacitor, one bypass capacitor
at VIN and one programming resistor) make the LTC3225
ideally suited for small battery-powered applications.
Charging current level is programmed with an external
resistor. When the input supply is removed, the LTC3225
automatically enters a low current state, drawing less than
1μA from the supercapacitors.
The LTC3225 is available in a 10-lead 3mm × 2mm DFN
package.