They are linear-taper digital potentiometers perform the same function as a mechanical potentiometer or a variable resistor.
AD5241 and AD5242 provide a single-/dual-channel, 256-position, digitally controlled variable resistor (VR) device. They have 2-Wire I2C Compatible Digital Interface.
A Circuit for charging NiCd, NiMH and Lithium-Ion Batteries.PWM 500kHz with Soft Start and Shutdown Control. The LT1510 can charge batteries ranging from 2V to 20V. Ground sensing of current is not required and the battery’s negative terminal can be tied directly to ground. A saturating switch running at 200kHz (500kHz for LT1510-5) giveshigh charging efficiency and small inductor size.
Uses MAX712/MAX713 fast charge controllers. PCB Design too. The only difference between them is the battery-fully-charged sensing method. The MAX713 is designed for NiCd batteries, while the 712 is for NiMh batteries.
One chip that takes care of all Power requirements in a Portable Electronic Gadget. Power Management Multi-Channel IC (PMIC) Solutions - PMIC Solutions with and without Battery Charger.