LTC3128 – 3A Monolithic Buck-Boost Supercapacitor Charger and Balancerv


  • ±2% Accurate Average Input Current Limit Programmable Up to 3A
  • Programmable Maximum Capacitor Voltage Limit
  • Active Charge Balancing for Fast Charging of Unmatched Capacitors
  • Charges Single or Stacked Capacitors
  • VIN Range: 1.73V to 5.5V
  • VOUT Range: 1.8V to 5.5V
  • <2μA Quiescent Current from VOUT When Charged
  • Output Disconnect in Shutdown: <1μA IQ Shutdown
  • Power-Good Comparator
  • Power Failure Indicator
  • Thermally Enhanced 20-Lead (4mm × 5mm × 0.75mm) QFN and 24-Lead TSSOP Packages

Typical Application



The LTC®3128 is a highly efficient, buck-boost DC/DC supercapacitor charger. It operates efficiently from input voltages above, below or equal to the output voltage. The LTC3128 incorporates accurate programmable average input current limit, active charge balancing and programmable maximum capacitor voltage. This combination of features makes the LTC3128 ideal for safely charging and protecting large capacitors in backup power systems. The input current limit and maximum capacitor voltage are each programmed using a single resistor. Average input current is accurately controlled over a 0.5A to 3A programmable range while the individual maximum capacitor voltage can be set from 1.8V to 3.0V.


For more detail: LTC3128 – 3A Monolithic Buck-Boost Supercapacitor Charger and Balancer with Accurate Input Current Limit

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