L9679B

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The L9679B is a specialized interface that is frequently used in many different applications. This device is a four-channel integrated constant current high-side switch with over-temperature protection, which makes it suitable for automotive applications. This device is also capable of having its open-drain NMOS outputs used as open-drain PMOS devices with the use of control logic.

The L9679B is well suited for application in controlling low voltage systems ranging from low voltage LEDs to more demanding motors. It can also be used in sound systems and other application systems with high efficiency and good power source management.

In automotive applications, the L9679B is used to enhance the control ability of an Engine Control Module (ECU) by providing an additional input sign. This device can also be used to control the illumination in a vehicle and has been approved in many automotive designs to switch low voltage LEDs.

The L9679B features 4 channels each with an integrated high-side switch. These switches are controlled by a single Enable/Disable port and by each channel\'s respective status pin. The efficiency of the L9679B switch is improved thanks to integrated logic which ensures that no current is conducted in the switches during standby mode.

The integrated thermal protection feature of the L9679B ensures the device does not overheat and thereby, maintains system reliability. This feature becomes active once the die temperature reaches a threshold of 140°C . Once the temperature reaches this point, the device automatically reduces the current, keeping the system from overloading or getting disconnected from the power source.

The scalability of the L9679B makes it an excellent choice for applications that require a high current level and wide range of controlling. It is also great for use in harsh automotive environments due to its ability to accept input voltages of 6V to 36V, which tracks the battery level in any weather condition. The L9679B has a load current of 5.5A, making it ideal for applications where quick current control is required, such as lighting and motors.

The working principle of the L9679B is fairly simple. When the power source is connected to the device, the Enable/Disable port will turn on the 4 switches allowing them to conduct the current between the high side and the low side of each switch. By controlling the logic value at the Enable/Disable Port, the user can quickly activate and deactivate the device. The current at the channels is determined by the respective Status pins. A logic value of ‘1’ will divide the current between all the channels, while a logic value of ‘0’ will force the switch to be off.

The L9679B has become a popular solution in many automotive and industrial applications due to its high current capabilities, overload protection, scalability and the capability to accept input from a wide range of power sources. This device makes it very easy for users to control the current levels at a system, making it ideal for use in applications ranging from low voltage LED lighting to power management of motors.

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