The LTC3110 is a bidirectional, programmable-input current buck-boost supercapacitor charger with active charge balancing for 1- or 2-series supercapacitors. Proprietary low noise buck-boost topology does the work of two separate switching regulators. The device operates in two modes: backup and charge. 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. Available in 24-lead and TSSOP 4 mm x 4 mm QFN packages, both featuring E- and I-grade operation from -40°C to +125°C, and up to +150°C for the H grade, pricing for the E-grade device starts at $4.45 each/1,000. For more info, visit http://www.linear.com/product/LTC3110
Linear Technology Corp.