Microchip Technology has launched the MCP73833 and MCP73834 single-cell, high current, Li-Ion/Li-Polymer linear charge-management controllers.
These fully integrated devices combine several key charge-management and safety features in a single chip.
By including a pass transistor, current-sense and reverse-discharge protection on a single chip, the MCP73833/4 charge-management controllers eliminate the need for external components. Multiple combinations of key charging parameters, including pre-conditioning current threshold and ratio, charge-termination threshold and recharge threshold ratio are available, meaning the devices provide standard product support for a variety of high-current Li-Ion/Li-Polymer charging applications. In addition, with a high charging current of up to 1 A and support for multiple regulated output voltages (4,2 V, 4,35 V, 4,4 V and 4,5 V), the devices can be used with various generations of Lithium battery technology.
Safety features on the new devices to prevent overcharging and overheating include charge timers, battery-temperature feedback and thermal-current regulation. The charge timer shuts the charger off if a charge is not terminated before timeout is reached. The battery-temperature feedback reduces the charge current if the battery's temperature reaches the limit of safety and the thermal-current regulation feature decreases the charge current if the charge-controller itself reaches its thermal limits.
Device-specific features include a power-good output on the MCP73833 and a timer-enable input on the MCP73834. Available in 10-pin MSOP and 3 x 3 mm DFN packages, both devices also offer a low dropout regulator test mode that enables application system test even in the absence of a battery; and both feature two status outputs to provide the user with additional information about the state of the charge-controller.
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