This is a very good solution for charging your Li-Ion batteries for your projects. This is actually what Panagiotis Kalogieris did for a project of his which he was going to use a typical Li-Ion cellphone battery. The MCP73831/2
Tiny 500mA linear charge management controller. Includes integrated pass transistor, integrated current sensing, and reverse discharge protection in 5-pin SOT-23 and thermally-efficient 8-pin 2mm x 3mm DFN packages
The MCP73831/2 devices are cost-effective linear charge management controllers with very small footprint (2MMx3mm DFN or 5-lead SOT23 package). They require a minimum amount of external components to operate making them suitable for portable devices or USB-powered applications.
The MCP73831/2 employ 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 accommodate new,emerging battery charging requirements. The constant current value is set with one external resistor. The MCP73831/2 devices 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 |
This is the Charger that Panagiotis made for his application:
You can find details here:
PresentationWorklog, schematics and PCB
More details on the chip:
Microchip pageMCP73831/2 Data SheetApplication Note 1088 - Selecting the Right Battery System For Cost-Sensitive Portable Applications While Maintaining Excellent QualityApplication Note 947 - Power Management in Portable Applications: Charging Lithium-Ion/Lithium-Polymer Batteries |
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