The ISL9237 has an input voltage range of 3.2 V to 23.4 V with an output of 2.4 V to 13.824 V for 1 to 3-cell batteries. Automatic sensing allows the device to enter trickle charging mode when the battery is depleted; it has an available setting for 2-level adapter current limit; and battery learn mode calibrates the battery fuel gauge. Programmable features using the SMBus or I²C interface provide the user with flexibility in the design.