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Linear Technology Release New 2A Buck-Boost Supercapacitor Charger


New Charger Features Bidirectional Operation with Active Charge Balancing and Programmable Input Current


Click for Larger Image - Linear Technology Release New 2A Buck-Boost Supercapacitor Charger

Linear Technology Corporation has released the new LTC3110, a bidirectional, programmable input current buck-boost supercapacitor charger with active charge balancing for 1- or 2- series supercapacitors. The proprietary low noise buck-boost topology does the work of two separate switching regulators, saving size, cost and complexity. The LTC3110 operates in two modes, backup and charge mode. In backup mode, the device maintains a system voltage, Vsys, of 1.71V to 5.25V, powered from the supercapacitor stored energy. Further, the supercapacitor storage input, Vcap, features a wide practical operating range from 5.5V down to 0.1V. This ensures that all practical stored supercapacitor energy is utilized, thereby extending backup times or shrinking the storage capacitors. Alternatively, in charge mode when the main power system is active, the LTC3110 can autonomously or through user command reverse the direction of power flow using the regulated system voltage to charge and balance the supercapacitors. Vcap is efficiently charged to above or below Vsys by the buckboost PWM (pulse width modulator). The device also features a chargemode average input current limit that can be programmed up to 2A with ±2% accuracy, preventing system power source overload while minimizing capacitor recharge time.

The LTC3110's active charge balancing eliminates the constant drain of dissipative external ballast resistors, ensuring charging even with mismatched capacitors and less frequent recharge cycles. Programmable maximum capacitor voltage regulation actively balances and limits the voltage across each capacitor in the series stack to one-half of the programmed value, ensuring reliable operation as capacitors age and develop mismatched capacities. The low Rds(ON), low gate charge synchronous switches provide high efficiency conversion to minimize the charging time of storage elements. The LTC3110 is ideal for safely charging and protecting large capacitors in backup power applications such as servers and RAID systems, and RF systems with battery/capacitor backup.

The LTC3110's input current limit and maximum capacitor voltage is resistor programmable. Average input current is accurately controlled over a 0.125A to 2A programming range. Pinselectable Burst Mode operation improves lightload efficiency and reduces standby current to only 40µA, and shutdown current to less than 1µA. Other features of the LTC3110 include high 1.2MHz switching frequency to minimize external component size, thermal overload protection, two voltage supervisors for direction control and end of charge, and one general purpose comparator with an opencollector output for interfacing with a microcontroller or microprocessor.


Key Features of the LTC3310

  • Vcap Operating Range: 0.1V to 5.5V
  • Vsys Operating Range: 1.71V to 5.25V
  • Automatic Switchover from Charge to Backup Mode
  • Programmable ±2% Accurate Charge Input Current Limit from 125mA to 2A
  • ±1% Backup Voltage Accuracy
  • Automatic Backup Capacitor Balancing
  • Fixed 1.2MHz Frequency Switching
  • Burst Mode® Operation: 40µA Iq
  • Extra Programmable Multipurpose Comparator with Open-Collector Output
  • Open Collector Outputs to Indicate Direction of Operation and End of Charge

The company's Web site address is www.linear.com.
[Reprinted with kind permission from Linear Technology - Release Date: 16th June, 2015]


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