MAX16839ASA+T

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MAX16839ASA+T is a voltage regulator, commonly referenced to as a PMIC (power management integrated circuit), developed by Maxim Integrated designed to provide a constant current source for high-power LEDs to optimize the current from at least one source output. It is part of the MAX16839 series of LED Drivers, which also includes the MAX16839A, MAX16839C, MAX16839E, MAX16839P, and MAX16839T.

The main application field of the MAX16839ASA+T is that it can be used to power a high-power LED while providing constant current which enables the LED to reach the highest efficiency and extend its service life. These LEDs are mainly employed in automotive lighting systems, such as headlights and taillights, emergency requirements, LCD backlight applications and portable light equipment.

The MAX16839ASA+T operates by accepting an input voltage range of 4.5V up to 1V and delivering an adjustable output voltage up to 10V with a wide output current range of 200mA up to 25mA. To achieve this, the MAX16839ASA+T has an internal error amplifier, current sense amplifier, and a switch to provide the LED with the correct current at all times. In automotive applications, the MAX16839SA+T complies with the AEC-Q100 Qualification Standards and has a high efficiency in the range of 95% over its operating temperature range.

The MAX16839ASA+T’s internal architecture includes two stages: an on-chip MOSFET and a switched-mode regulator. The integrated MOSFET is responsible for regulating the current sourced to the LED and providing protection against short circuits and over-voltages. The switched-mode regulator serves as a voltage control loop in the circuit, by constantly comparing the LED currents with the setpoints stored in the internal current register. This ensures the LED receives the right amount of current at all times, even when the input voltage fluctuates.

The MAX16839ASA+T provides an adjustable, accurate, and efficient current source for LEDs, allowing for better control over brightness. It has low power losses, high-side current sensing transistors, and an integrated bootvoltage ballasting circuit. The board design is also optimized for thermal performance and stability, ensuring robustness and reliability under various operating conditions.

Due to the specialized power control integrated into the MAX16839ASA+T, it is capable of dimming the LED when a load is applied, and can also operate with a power factor of more than 0.9. Furthermore, it offers adjustable time delays and current protection against open-circuit and short-circuit. The MAX16839ASA+T is ideal for application in automotive designs, requiring efficient and reliable power supply.

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