Battery optimises charging without external mcu or system software

The MAX8895, a linear battery charger for Bluetooth headsets and portable devices, is compatible with the USB Battery Charging Specification, Revision 1.1. The device is equipped with automatic adapter detection for distinguishing between USB devices, USB chargers, and dedicated chargers. It integrates a USB enumeration function that automatically negotiates with the USB host to optimise charging current without processor intervention. According to Maxim, this eliminates the need for a separate microcontroller and system software, providing what it calls 'the industry's only stand alone charging solution'. Smart power selector functionality provides distribution of power from the USB power input (Vbus) to the battery and system load. This is said to enable simultaneous charging of the battery while powering the system, as well as operation of the portable device with a discharged battery or no battery. The battery also supplements Vbus when the system load exceeds the Vbus input current limit. The MAX8895 integrates a battery disconnect switch, current sense circuit, thermal regulation circuitry, mosfet pass elements, and overvoltage protection up to 16V. Programming options include fast charge current, termination current, and charge timer duration. It also supports adaptive battery charging, which reduces charge current when necessary to prevent the charge source from collapsing. The device is available with two USB options, the MAX8895X (low speed) and the MAX8895Y (full speed), both of which operate from a 4 to 6.6V supply.