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MCP73826 Datasheet(PDF) 1 Page - Microchip Technology |
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MCP73826 Datasheet(HTML) 1 Page - Microchip Technology |
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1 / 24 page  2002 Microchip Technology Inc. DS21705A-page 1 M MCP73826 Features • Linear Charge Management Controller for Single Lithium-Ion Cells • High Accuracy Preset Voltage Regulation: +1% (max) • Two Preset Voltage Regulation Options: - 4.1V - MCP73826-4.1 - 4.2V - MCP73826-4.2 • Programmable Charge Current • Automatic Cell Preconditioning of Deeply Depleted Cells, Minimizing Heat Dissipation Dur- ing Initial Charge Cycle • Automatic Power-Down when Input Power Removed • Temperature Range: -20°C to +85°C • Packaging: 6-Pin SOT-23A Applications • Single Cell Lithium-Ion Battery Chargers • Personal Data Assistants • Cellular Telephones • Hand Held Instruments • Cradle Chargers • Digital Cameras Typical Application Circuit Description The MCP73826 is a linear charge management con- troller for use in space-limited, cost sensitive applica- tions. The MCP73826 combines high accuracy constant voltage, controlled current regulation, and cell preconditioning in a space saving 6-pin SOT-23A pack- age. The MCP73826 provides a stand-alone charge management solution. The MCP73826 charges the battery in three phases: preconditioning, controlled current, and constant volt- age. If the battery voltage is below the internal low-volt- age threshold, the battery is preconditioned with a foldback current. The preconditioning phase protects the lithium-ion cell and minimizes heat dissipation. Following the preconditioning phase, the MCP73826 enters the controlled current phase. The MCP73826 allows for design flexibility with a programmable charge current set by an external sense resistor. The charge current is ramped up, based on the cell voltage, from the foldback current to the peak charge current estab- lished by the sense resistor. This phase is maintained until the battery reaches the charge-regulation voltage. Then, the MCP73826 enters the final phase, constant voltage. The accuracy of the voltage regulation is better than ±1% over the entire operating temperature range and supply voltage range. The MCP73826-4.1 is preset to a regulation voltage of 4.1V, while the MCP73826- 4.2 is preset to 4.2V. The MCP73826 operates with an input voltage range from 4.5V to 5.5V. The MCP73826 is fully specified over the ambient temperature range of -20°C to +85°C. Package Type + - GND V DRV V SNS V IN V BAT SHDN 12 3 6 5 4 10 µF 100 k Ω 100 m Ω V IN Single Lithium-Ion Cell NDS8434 MA2Q705 500 mA Lithium-Ion Battery Charger 5V 10 µF MCP73826 6-Pin SOT-23A GND VDRV VSNS VIN VBAT SHDN 1 2 3 6 5 MCP73826 4 Single Cell Lithium-Ion Charge Management Controller |
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