THL3503-B

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The THL3503-B is an ultra-low quiescent current integrated power system (PMIC) specifically designed for LED drivers and miniature applications. The device integrates a 300mV linear regulator and a very low noise output buck regulator with over-current, short-circuit and over-temperature protections. The device is extremely compact, with all the necessary protection features necessary for cost-effective LED systems. The THL3503-B features a dual-output buck regulator architecture capable of operating from an input voltage of 2.2V up to 5.5V. The device can deliver up to 1.5A of output current when powered from a 5V input with a low power dissipation for a given output current. In addition, the device has an integrated low dropout linear regulator with an input voltage range from 2V to 80V. The linear regulator can deliver up to 200mA of current output, making it ideal for powering small microcontrollers and other low-power applications.The power management of the THL3503-B is handled by the on-board buck and linear regulators. The buck regulator can be configured to support both a constant current and constant voltage output, allowing it to be optimized for powering a wide-range of LED configurations. Connected to the buck regulator is an over-current and short-circuit protection circuit. This protection circuit will assist in protecting both the LED and the THL3503-B from damage due to power overloads or short-circuit conditions. The THL3503-B also features an integrated over-temperature protection circuit which monitors the power output and will shut down the device safely if the temperature rises above its safe operating threshold. The integrated protection circuit also offers a soft-start feature which ramp the power output up more gradually than traditional start-up techniques, helping with reducing inrush current during start up. In summary, the THL3503-B is an ideal PMIC for powering LED systems, providing all the necessary components and protection features within a small form factor. The dual-output buck regulator architecture enables the device to support a wide range of LED configurations, and the integrated low dropout linear regulator can be used to power other low-power applications. Finally, the integrated over-current, short-circuit, and over-temperature protection help protect the output from damaging events which may occur during operation.

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