The MAX8903 is a dual-input charger which supports separate DC and USB inputs. This switch mode charger uses high-speed switching to eliminate heat and decrease external components.
The LTC2942 is a high-precision power and energy monitor manufactured by Analog Devices. It is capable to monitor the voltage, charge, and temperature.
The LM338 is an adjustable 3-terminal positive voltage regulator which is capable of delivering 5A over a 1.2-V to 32-V output range. The LM388 needs only two resistors to set the output voltage, this increased the popularity of LM338.