Maxim Ic introduces new charger chip  , MAX8903A  designed  for Li+ battery cells chargers applications  .  MAX8903A charger chip have a Smart Power Selector™ technology with AC adapter and USB power inputs.

The MAX8903A features optimized smart power control to make the best use of limited USB or adapter power .  All power switches for charging and between the load battery and the external power are included in th MAX8903 chip .

To build a charger circuit using the MAX8903A charger chip is required  few external components and no external MOSFETs, blocking diodes, or current-sense resistors are required.

The output current limit can be set up to 2A while USB input current can be set to 100mA or 500mA.

When the device is connected to the external power the system will be switched automatic from battery  to the external power .

 The DC input for MAX8903A operates from 4.15V to 16V with up to 20V protection, while the USB input has a range  of 4.1V to 6.3V with up to 8V protection.

Main features of the MAX8903A charger chip are : Efficient DC-DC Converter Eliminates Heat ,  4MHz Switching for Tiny External Components  ,  Instant On—Works with No Battery or Low Battery , Dual Current-Limiting Input Circuits—AC Adapter or USB , Thermistor Monitor  , Integrated Current-Sense Resistor , No External MOSFETS or Diodes , 4.1V to 16V Input Operating Voltage Range .