The chart on this page compares the LT3652 to the LT3650 and LTC4009 devices. With respect to the LT3650, the LT3652 has an additional solar input voltage regulation loop and no input current limiting (LT3650 has PowerPath control with input current limiting). Also, the LT3652 offers multi-chemistry operation. Additionally, the LT3650 requires two external high-precision resistors to set the battery float voltage which comes at an additional cost. Also shown on this chart is a comparison of the LT3652 to the LTC4009 battery charger controller. As can be seen here, the LT3652 has a wider input voltage range and is monolithic (switch is on-chip) with a 2A charge current capability vs. the LTC4009’s external FET-dependent 4A operation. The LT3652 has a smaller package (3mm x 3mm vs. 4mm x 4mm), a higher switching frequency, smaller externals, and different multi-chemistry capability (number of cells and/or battery output voltage range). In some chemistry cases these are advantages, while in others these are disadvantages. Other features the LT3652 has that the LTC4009 does not are onboard charge termination, non-synchronous operation, trickle charge but not via the PROG pin (as with LTC4009), pre-qualification and recharge capability, and a thermistor input.