The MCP73837 and MCP73838 devices are fully?integrated linear Li-Ion / Li-Polymer battery chargers?with autonomous power source selection. Along with its?small physical size, the low number of external
components required makes the MCP73837/8 ideally?suitable for portable applications.
The MCP73837/8 automatically selects the USB-Port
or AC-Adapter as the power source for the system. For
the USB-Port powered systems, the MCP73837/8
specifically adheres to the current limits governed by
the USB specification. The host microcontroller can
select from two preset maximum charge current rates
of 100 mA (low power USB-port) or 500 mA (high
power USB-port). With an AC-Adapter providing power
to the system, an external resistor sets the magnitude
of the system or charge current up to a maximum of 1A.
The MCP73837/8 employs a constant current /
constant voltage charge algorithm with selectable
preconditioning and charge termination. The constant
voltage regulation is fixed with four available options:
4.20V, 4.35V, 4.40V, or 4.50V, to accommodated the
new emerging battery charging requirements. The
MCP73837/8 limits the charge current based on die
temperature during high power or high ambient
conditions. This thermal regulation optimizes the
charge cycle time while maintaining the device?reliability.
The MCP73837/8 are fully specified over the ambient?temperature range of -40°C to +85°C.
The MCP73837/8 devices are available in a 10-Lead,3 mm x 3 mm, DFN package or in a 10-Lead MSOP?package.