Features and Benefits

  • High Efficiency Step-Up/Step-Down Charging of Two Series Supercapacitors
  • Automatic Cell Balancing Prevents Capacitor Overvoltage During Charging
  • Programmable Charging Current Up to 500mA (Single Inductor), 1A (Dual Inductor)
  • VIN = 2.7V to 5.5V
  • Selectable 2.4V/2.65V Regulation per Cell (LTC3625)
  • Selectable 2V/2.25V Regulation per Cell (LTC3625-1)
  • Low No-Load Quiescent Current: 23μA
  • IVOUT, IVIN < 1μA in Shutdown
  • Low Profile 12-lead 3mm × 4mm DFN Package

Product Details

The LTC3625/LTC3625-1 are programmable supercapacitor chargers designed to charge two supercapacitors in series to a fixed output voltage (4.8V/5.3V or 4V/4.5V selectable) from a 2.7V to 5.5V input supply. Automatic cell balancing prevents overvoltage damage to either supercapacitor while maximizing charge rate. No balancing resistors are required.

High efficiency, high charging current, low quiescent current and low minimum external parts count (one inductor, one bypass capacitor at VIN and one programming resistor) make the LTC3625/LTC3625-1 ideally suited for small form factor backup or high peak power systems.

Charging current/maximum input current level is programmed with an external resistor. When the input supply is removed and/or the EN pin is low, the LTC3625/LTC3625-1 automatically enter a low current state, drawing less than 1μA from the supercapacitors.

The LTC3625/LTC3625-1 are available in a compact 12‑lead 3mm × 4mm × 0.75mm DFN package.


  • Servers, RAID Systems, Mass Storage, High Current Backup Supplies
  • Solid State Hard Drives
  • Wireless Power Meters
  • High Peak Power Boosted Supplies

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits (2)

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Product Recommendations

LTC3625 Companion Parts

Recommended Related Parts

Design Resources

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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.