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MCP73811

Microchip Technology
Part Number MCP73811
Manufacturer Microchip Technology
Description (MCP73811 / MCP73812) Fully Integrated Li-Ion / Li-Polymer Charge Management Controllers
Published Oct 2, 2009
Detailed Description MCP73811/2 Simple, Miniature Single-Cell, Fully Integrated Li-Ion / Li-Polymer Charge Management Controllers Features • ...
Datasheet PDF File MCP73811 PDF File

MCP73811
MCP73811

Overview
MCP73811/2 Simple, Miniature Single-Cell, Fully Integrated Li-Ion / Li-Polymer Charge Management Controllers Features • Complete Linear Charge Management Controller - Integrated Pass Transistor - Integrated Current Sense - Integrated Reverse Discharge Protection • Constant Current / Constant Voltage Operation with Thermal Regulation • High Accuracy Preset Voltage Regulation: + 1% • Voltage Regulation: 4.
20V • Selectable Charge Current: - MCP73811: 85 mA / 450 mA • Programmable Charge Current: - MCP73812: 50 mA - 500 mA • Minimum External Components Required: - MCP73811: 2 Ceramic Capacitors - MCP73812: 2 Ceramic Capacitors and 1 Resistor • No Preconditioning • No End-of-Charge Control • No Undervoltage Lockout (UVLO) • Automatic Power-Down when Input Power Removed • Active High Charge Enable • Temperature Range: - -40°C to +85°C • Packaging: - 5-Lead SOT-23 Description 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 o...


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