The MCP73811/2 devices are linear charge management
controllers that are designed for use in space
limited and cost sensitive applications. The
MCP73811/2 provide specific charge algorithms for
single cell Li-Ion or Li-Polymer battery to achieve
optimal capacity in the shortest charging time possible.
Along with its small physical size, the low number of
external components required make the MCP73811/2
ideally suited for portable applications. For applications
charging from a USB port, the MCP73811 adheres to
all the specifications governing the USB power bus.
The MCP73811/2 employ a constant current/constant
voltage charge algorithm. The constant voltage regulation
is fixed at 4.20V, with a tight regulation tolerance of
1%. For the MCP73811, the constant current value is
selected as 85 mA (low power USB port) or 450 mA
(high power USB port) with a digital input signal on the
PROG input. For the MCP73812, the constant current
value is set with one external resistor. The
MCP73811/2 limit the charge current based on die
temperature during high power or high ambient
conditions. This thermal regulation optimizes the
charge cycle time while maintaining device reliability.
The MCP73811/2 are fully specified over the ambient
temperature range of -40°C to +85°C. The
MCP73811/2 are available in a 5-Lead, SOT-23
package.