onsemi / Fairchild FAN5400 Li-Ion Battery Switching Chargers

onsemi / Fairchild FAN5400 USB-compliant Li-Ion Battery Switching Chargers address the need for faster charge times for Li-Ion batteries in portable devices and overcome the thermal issues associated with linear chargers. The charging parameters and operating modes of ON Semiconductor FAB540x battery switching chargers are programmable through an I²C interface that operates at up to 3.4Mbps. A maximum charge current of 1.25A ensures fast charging times, and a high charge voltage accuracy (±0.5 percent @25°C) allows for more "topping out" of the battery, resulting in longer battery life. In addition to the standard thermal and short circuit protection, the FAN5400 family can sustain up to 20V_DC on the input, to protect against unregulated over-voltage conditions on the USB port. These devices provide highly efficient re-charging either through a USB port or a 5V_AC/DC adapter and remain cool while recharging. These Li-Ion battery switching chargers are an ideal solution for recharging single-cell and parallel-cell Li-Ion batteries, outperforming the traditional linear charger while providing a convenient USB On-The-Go (USB-OTG) capability.