The LTC4015 is unique in Linear’s portfolio. The closest ICs are the LTC4020 buck-boost battery charger controller and the LTC4000 paired with an externally compensated buck switching regulator. The LTC4015 cannot boost like the LTC4020 and its input voltage is limited to 35V, unlike the 55V LTC4020 and 60V LTC4000 charger controller. However, the LTC4015’s integrated coulomb counter and digital telemetry system make it Linear’s most full-featured battery charger power management solution. The primary differences between the LTC4015 and the LTC4020 are: the LTC4015 is a buck topology vs. buck-boost for the LTC4020, LTC4015 has a narrower input voltage range, and the LTC4015 has a more sophisticated maximum power point function, tracking vs. control. In addition, the LTC4015 features a battery health monitoring/digital telemetry system, Coulomb counter, I²C serial port control, SMBUS SMBAlert protocol support, and JEITA compatibility.