UC3909NG4

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The UC3909NG4 is an integrated power management IC that offers a comprehensive solution for battery charging applications. It is a single-package device, containing an adjustable Li-ion or Li-polymer chargers, power-MOSFETs, current and voltage sensors, and a low-dropout linear regulator. The device is suitable for a wide range of applications such as smartphones, tablets, wearables, and other battery-powered devices.

Application Field

The UC3909NG4 is designed for battery charging applications that require high current and accuracy, efficient power conversion, and enhanced safety. It is suitable for applications that require a system load current of up to 3A and a charging current of up to 2A. The device is a complete power management solution and is suitable for single-cell Li-ion or Li-polymer batteries.

The UC3909NG4 incorporates efficient power conversion techniques, including a low-dropout linear regulator for regulating the system loads and a high-efficiency dual-mode buck switch for power-efficient operation. The device includes a programmable safety timer and a temperature monitor. Additionally, the UC3909NG4 supports a wide input voltage range from 6.5 to 16V and works with a wide range of applications.

Working Principle

The UC3909NG4 uses advanced power conversion techniques for efficient battery charging and power regulation. A low-dropout linear regulator is used to regulate the system load. The device supports a wide input voltage range from 6.5 to 16V. In high-efficiency dual-mode buck switch mode, the battery is charged with a current determined by the sense resistor. The battery charging current is limited by the current sense resistor and is adjustable by the power MOSFET on-resistance. The device also features a programmable safety timer and a temperature monitor for enhanced safety and reliability.

When the battery is fully charged, the UC3909NG4 enters a low-IQ standby mode and the power MOSFET is shut off. The device also implements a voltage regulation loop to maintain the output voltage of the battery. In addition, the UC3909NG4 features a low quiescent current (IQ) mode for low power consumption during standby mode.

The UC3909NG4 is an ideal power management solution for Li-ion or Li-polymer battery charging applications. It is designed to offer efficient power conversion, high accuracy, and enhanced safety features. The device is suitable for a wide range of applications such as smartphones, tablets, wearables, and other battery-powered devices.

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