Features and Benefits

  • Low Noise Constant Frequency Charging of Two Series Supercapacitors
  • Automatic Cell Balancing Prevents Capacitor Overvoltage During Charging
  • Programmable Charge Current (Up to 150mA)
  • Selectable 2.4V or 2.65V Regulation per Cell (LTC3225)
  • Selectable 2V or 2.25V Regulation per Cell (LTC3225-1)
  • Automatic Recharge
  • IVIN = 20μA in Standby Mode
  • ICOUT < 1μA When Input Supply is Removed
  • No Inductors
  • Tiny Application Circuit (2mm × 3mm DFN Package, All Components <1mm High)

Product Details

The LTC3225/LTC3225-1 are programmable supercapacitor chargers designed to charge two supercapacitors in series to a selectable fixed output voltage (4.8V/5.3V for the LTC3225 and 4V/4.5V for the LTC3225-1) from input supplies as low as 2.8V to 5.5V. 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 flying capacitor, one bypass capacitor at VIN and one programming resistor) make the LTC3225/LTC3225-1 ideally suited for small battery-powered applications.

Charge current level is programmed with an external resistor. When the input supply is removed, the LTC3225/LTC3225-1 automatically enter a low current state, drawing less than 1μA from the supercapacitors.

The LTC3225/LTC3225-1 are available in a 10-lead 2mm × 3mm DFN package.


  • Current Limited Applications with High Peak Power Loads (LED Flash, PCMCIA Tx Bursts, HDD Bursts, GPRS/GSM Transmitter)
  • Backup Supplies

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

Tools & Simulations


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Product Recommendations

LTC3225 Companion Parts

Recommended Related Parts

Design Resources

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Evaluation Boards

Pricing displayed is based on 1-piece.

Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.