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MCP73826 bảng dữ liệu(PDF) 9 Page - Microchip Technology |
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MCP73826 bảng dữ liệu(HTML) 9 Page - Microchip Technology |
9 / 24 page 2002-2013 Microchip Technology Inc. DS21705B-page 9 MCP73826 4.0 DEVICE OVERVIEW The MCP73826 is a linear charge management con- troller. Refer to the functional block diagram on page 2 and the typical application circuit, Figure 6-1. 4.1 Charge Qualification and Preconditioning Upon insertion of a battery or application of an external supply, the MCP73826 verifies the state of the SHDN pin. The SHDN pin must be above the logic high level. If the SHDN pin is above the logic high level, the MCP73826 initiates a charge cycle. If the cell is below the preconditioning threshold, 2.4V typically, the MCP73826 preconditions the cell with a scaled back current. The preconditioning current is set to approxi- mately 43% of the fast charge peak current. The pre- conditioning safely replenishes deeply depleted cells and minimizes heat dissipation in the external pass transistor during the initial charge cycle. 4.2 Controlled Current Regulation - Fast Charge Preconditioning ends and fast charging begins when the cell voltage exceeds the preconditioning threshold. Fast charge utilizes a foldback current scheme based on the voltage at the VSNS input developed by the drop across an external sense resistor, RSENSE, and the out- put voltage, VBAT. Fast charge continues until the cell voltage reaches the regulation voltage, VREG. 4.3 Constant Voltage Regulation When the cell voltage reaches the regulation voltage, VREG, constant voltage regulation begins. The MCP73826 monitors the cell voltage at the VBAT pin. This input is tied directly to the positive terminal of the battery. The MCP73826 is offered in two fixed-voltage versions for battery packs with either coke or graphite anodes: 4.1V (MCP73826-4.1) and 4.2V (MCP73826-4.2). 4.4 Charge Cycle Completion The charge cycle can be terminated by a host micro- controller after an elapsed time from the start of the charge cycle. The charge is terminated by pulling the shutdown pin, SHDN, to a logic Low level. |
Số phần tương tự - MCP73826_13 |
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Mô tả tương tự - MCP73826_13 |
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