MCP73834T-FCI/UN

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PMIC - Battery Chargers are integral components of many products and in fact are a must-have in any product that requires a battery to be connected to the system. The MCP73834T-FCI/UN, is a Linear Li-Ion Charger IC from the Microchip Technology PIC family, is an advanced highly integrated power-management and battery-charging controller for single-cell Li-Ion and Li-Polymer application. This device operates with minimum charge currents and low quiescent current, making it an ideal choice for portable devices requiring extended battery life.

The MCP73834T-FCI/UN offers excellent charging performance while providing features needed to maximize the performance of battery-powered systems. This low dropout linear charger charges Li-Ion or Li-Polymer battery packs with battery voltages up to 4.2V. During the charge cycle, the battery charge current is autonomously regulated through a high-accuracy current-limit control loop. This linear charger also offers a wide range of charge-current options (50mA to 1.5A).

The integrated internal safety foldback-mode will halt the charge cycle whenever the maximum charge current is exceeded, further protecting the battery pack from excessive current conditions. In addition, the MCP73834T-FCI/UN also features an integrated charge status LED, allowing at-a-glance monitoring of the charging operation. An internal thermal-regulation foldback circuit reduces charge current when the chip reaches a preset internal temperature, so that thermal runaway conditions are avoided.

The MCP73834T-FCI/UN also features complete battery-charge management, including preconditioning, top-off, and complete-charge indication. The device\'s preconditioning mode activates immediately when the input voltage exceeds the battery voltage. After the preconditioning has completed, the complete-charge indication mode is activated, indicating a full charge by asserting the CHRGn pin. The device also features an integrated Cell Temperature Monitoring circuit, providing an accurate measure of the battery\'s temperature during charge. This feature helps identify potential problems in the battery, eliminating costly oversights while ensuring that the charging process is running correctly.

The MCP73834T-FCI/UN incorporates power-management functions such as Battery Voltage Measurement (BVM), Battery Current Measurement (BCM), Battery Over-Voltage Protection (BOP) and Battery Over-Current Protection (BOC). The BVM measurements provide an accurate measure of battery voltage, allowing the device to accurately regulate both charge current and charge voltage. BCM measurements provide a reliable estimate of battery current, allowing the device to quickly adjust the charging process when battery current changes. The BOP and BOC circuits help protect the battery from excessive over-voltage and over-current conditions, further preserving battery life.

The MCP73834T-FCI/UN also includes an integrated power-management feature known as Priority Mode. This feature allows the system to maintain critical functions even when the battery level is low. In Priority Mode, the device reduces the charging current while the system continues to operate, ensuring the system can still perform essential tasks until the battery is fully charged. This feature is particularly beneficial when the battery is powering a system with low battery levels, such as a device that must remain connected in order to perform its primary functions.

Most critically, the MCP73834T-FCI/UN boasts an extremely high integration level, allowing for maximum efficiency and minimal design complexity. This high integration level makes the MCP73834T-FCI/UN an ideal choice for use in applications such as mobile phones, tablets, and portable gaming devices. It is also an excellent choice for battery-powered instruments, GPS tracking systems, automated metering systems, and many other applications that rely on a reliable, efficient power source.

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