LT3799EMSE#TRPBF

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LED Drivers are found in modern day products in many different forms, from lighting applications and displays to interactive features. The LT3799EMSE#TRPBF is a monolithic buck-boost DC/DC LED Driver designed to be used in battery operated systems, such as portable applications. This LED Driver provides constant-current outputs up to a maximum of 100mA, while operating from a wide input voltage range of 0.9V - 5.5V.

The LT3799EMSE#TRPBF is available in a compact 8-lead 3mm x 3mm TDFN package and is capable of driving up to 8 different LEDs independently. It also offers an adjustable frequency up to 500kHz, allowing the user to select an optimized switching frequency for their application. The hysteretic control architecture eliminates the feed-forward components such as resistors, capacitors, or inductors, which are commonly required for other types of switching regulators.

The LT3799EMSE#TRPBF application field is mainly centered on battery-operated applications such as automotive lighting, gaming systems, portable devices, and charging indicators. It is important to note that the LT3799EMSE#TRPBF is a highly efficient circuit, with a typical efficiency of up to 95%. This helps ensure the battery life of the device is not negatively impacted by the LED Driver.

The LT3799EMSE#TRPBF features a programmable, open-drain output pin that is capable of controlling up to 8 LEDs in a serial configuration. This open-drain output pin is connected to the VIN pin and acts as a low-side switch that turns on the LEDs when VIN reaches the threshold voltage (2.5V typical).

The working principle of the LT3799EMSE#TRPBF relies on the hysteretic control architecture, which provides constant-current regulation without the need for external components. In this topology, the output voltage is compared to a voltage reference and the resulting error voltage is fed back to the control circuit. A comparator then compares the error voltage to a hysteretic threshold, which determines whether the output switch should be on or off. As the output voltage drops below the threshold, the switch is turned off, and the LED current is regulated by the output voltage being held to a fixed level by a low-pass filter.

The LT3799EMSE#TRPBF also features over-voltage, under-voltage, overload, and short-circuit protection to ensure safe and reliable operation in mobile applications. Additionally, it offers thermal shutdown protection to protect against excessive junction temperatures. The LED Driver also features a small shutdown current of 1μA.

Overall, the LT3799EMSE#TRPBF is a highly efficient LED Driver that is designed to enhance the battery life of mobile systems. Its hysteretic control architecture ensures high accuracy and fast response, allowing it to provide constant-current regulation without the need for external components. It also features protection against over voltage, under voltage, overload and short-circuit, as well as thermal shutdown protection, thus making it a great choice for battery-operated applications.

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