The LTC4013, which uses N-channel MOSFETs for high efficiency charging, features a battery charge voltage range of 0 to 60V. The main charging features of the product can be adjusted using pin-strap configurations and programming resistors, enabling the user to select between several predefined charging algorithms depending on battery chemistry.
For lead-acid battery types, the LTC4013 supports multiple charging stages, including float, programmable-timed absorption and equalisation. Each charge voltage includes adjustable temperature compensation. For Li-ion/polymer cells, the device offers a constant-current/constant-voltage charging algorithm.
The SYNC input provides the ability to synchronise the switching frequency to an external clock to avoid noise in a particular frequency range or to target noise filters to a specific frequency. Other features include an external input MOSFET driver to avoid battery discharge during an input supply short, two open-drain status pins and an ISMON pin that provides analogue information about charge current.
The LTC4013 is housed in a 28 lead QFN package measuring 4 x 5mm, with an exposed metal pad for thermal management. According to Linear, E and I grade versions of the part are suited to temperatures ranging fron -40 to 125°C.
