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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
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.
Key Features of the LTC3310
The company's Web site address is www.linear.com.
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