BQ24109RHLT

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BQ24109RHLT is a highly-integrated lithium-ion (Li+) interface battery charger IC, which employs synchronous switching buck boost technology to detect battery voltage, charge and signal the battery level. It is especially suitable for high-end cell-phone, notebook computer, tablet, portable medical device and their power system design. It is a battery charger controller with a built-in power FET and synchronous switching boost converter for a wide range of applications.

Application Field:

It has a wide range of applications in the fields of cellular phones, notebook computers, and tablet PCs.. As a key component in portable systems, BQ24109RHLT can rapidly provide related power systems with the required charging current and voltage. With the capability of controlling and connecting several different power sources, BQ24109RHLT is highly energy efficient. It has several features that provide flexibility and wide compatibility, such as input current limitation, variable charge current, output voltage regulation, and system status monitoring.

BQ24109RHLT can accurately read the battery voltage while keeping the output current under precise control. It also has safety features, such as overload protection, thermal compensation, and reverse current protection, which ensure battery safety and reliable operation. With its robust design, BQ24109RHLT can be used in all portable electronic systems ranging from high-end mobile phones to entry-level devices.

Working Principle:

BQ24109RHLT utilizes synchronous boost converter technology to regulate the charging current. The controller monitors the battery voltage during charging and outputs a reference voltage to its external power switch. The switch regulates the current according to the voltage reference. This charge current is weakly coupled with the output current of the boost converter. As the input charging current increases its output current follows and the output voltage will stay constant until the charge current reaches the over-charging limit. The controller has multiple charging protocols, the most commonly used one being the linear charge mode.

In linear charge mode, the controller controls the input current through an internal pulse width modulation (PWM) signal. This signal is generated by comparing the battery voltage with pre-programmed voltage levels. The PWM signal will increase or decrease its width proportional to the difference between the battery voltage and the desired charge voltage. When the battery voltage reaches its programmed voltage set-points, the controller will automatically switch the operation mode for the charging application.

The controller contains circuitry to detect conditionals, show errors and protect the battery from over-charging. When an error is detected the power switch is shut off and the controller signals the system to stop charging. The controller also provides a feature of sensing an external temperature sensor. This feature can be used to control the charge current and charge voltage levels depending on the environmental temperature.

BQ24109RHLT also controls a system power FET. This can be used to ensure the charger does not draw power from the external power source until the battery voltage is above a certain level. This feature prevents unintentional power consumption from the power source when the battery is empty or discharged. This feature can be enabled or disabled through the power switch control pin.

Overall, BQ24109RHLT is a highly efficient and purpose-built battery charger controller. By utilizing synchronous boost converter technology, it can combine a high performance charger with a highly efficient system. Its numerous features and protections make it ideal for high-end cellular phones, tablets and other battery intensive applications.

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