In summary, the LTC4040 is a complete lithium battery backup power management system for 3.5V to 5V supply rails that must be kept active during a main power failure. The LTC4040 has a high level of integration and an extensive feature set. It replaces a combination 3-chip solution: a battery charger, a boost regulator and a PowerPath controller, with higher performance, all included in 1 IC. Typical applications include: Systems with lower power, long backup times required, fleet and asset tracking, automotive GPS data loggers, automotive telematics systems, toll collection systems, security systems, and USB powered devices.