MCP73871T-2CCI/ML

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A battery charger represents a power management integrated circuit (PMIC) specially designed to tend battery cells. Battery chargers have the capacity to charge rechargeable batteries with a current compatible with their type and size. This is the case of the MCP73871T-2CCI/ML, a PMIC focused in battery management.

The 3.0-pin SC70 packages provide flexible power path management for single cell Li-Ion/Li-Polymer batteries. This device employs an automatic recharge system along with a programmable linear charger. It features end-of-charge status output, recharge status, and automatic power-switch control.

The operating voltage of the MCP73871T-2CCI/ML ranges from 2.5 V to 6.0 V, has an adjustable preconditioning charge current, a constant-current charge mode, an adjustable float voltage (4.1 V to 4.4 V), an end-of-charge input, reset input, and six built-in status flags.

The circuit can be configured to work in three different modes to suit a wide range of applications: 1) direct-charge mode, where the battery is charged with a pre-programmed current and voltage, 2) recharge mode, to charge the battery again after a deep-discharge event is detected, and 3) hibernate mode, to keep the battery in a maintenance charging state for long-term shelf-life.

The precision current-sensing and voltage-regulation circuits are implemented, respectively, with a 0.1% and 0.5% accuracy of the level set by the active programming pins. A programmable current protection and input protection circuit ensures safety to the device.

Several automotive and industrial applications, such as power tools, health care, and portable instruments, require focus on battery management, as such exemplary devices have a long operational life, enabling recharge/discharge cycles with time intervals. This requirement is seen in portable medical devices, such as heart monitors, blood pressure monitors and blood glucose readers, as well as emergency power supply systems.

Cell phone battery chargers also require an efficient control circuit, so the device can meet the requirement of a long-term power supply and static power control. The charging circuit must also be able to protect and supply an appropriate voltage and current to the battery during a low-load power-supply condition.

The MCP73871T-2CCI/ML is suited for this task due to its ability to provide optimum power supply regardless of the power input source, allowing battery charge when no AC power is available, from multiple cell-phone batteries to two single-cell Li-Ion or Li-Polymer battery packs.

The working principle of the MCP73871T-2CCI/ML is quite simple: it monitors the cell voltage and attempts to charge the cell when the voltage drops below its preset level. The device then switches the power off when the cell is fully charged, thereby avoiding overcharging, and discharging the cell when the voltage drops further. The device requires only simple power switch and over-voltage protection.

In conclusion, the MCP73871T-2CCI/ML is an adaptive system designed to provide an optimized charge and discharge to the battery. It is suitable for a wide range of applications, from small portable devices to mobile phones, due to its versatility and programmable charge current. Additionally, its precision current-sensing and voltage-regulation circuits can guarantee the user with the highest possible efficiency. A reliable battery management system is therefore essential for this type of applications, where the MCP73871T-2CCI/ML is a very useful solution.

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