LM3502SQX-44

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The LM3502SQX-44 is a type of power management IC (PMIC) designed specifically as a LED driver. It is an integrated circuit created to regulate, control and monitor the supply voltage used in an LED module or luminaire. Capable of featuring low EMI and wide-dimming range for LED lighting applications, it serves to monitor the LED control signals and the LED current to ensure that the LED light is constantly running at optimal levels. The operating voltage of LM3502SQX-44 ranges from 4.5V to 35V, and maximum output power is 9.6W. It is ideal for powering systems with high efficiency and low power loss.

Features

The LM3502SQX-44 provides several features useful for LED applications:

• High Efficiency of up to 95%.
• Wide 4.5V to 35V Input Voltage Range.
• Built-in Soft-Start, Slew-Rate Control, leading to low EMI.
• Advanced Dimming Functionality.
• Low Ripple and Noise.
• Programmable Pre-BIAS Function.
• Programmable Output Current.
• Open/Short/Overvoltage Protection.
• Thermal Protection.

Application Field and Working Principle

The LM3502SQX-44 is suitable for several applications, most notably constant current drive for power LEDs, such as those used for lighting and automotive lighting. It is also appropriate for applications such as backlight for mobile phones, monitors, street lights, and commercial lighting. The LM3502SQX-44 uses a proprietary adaptive on-time technique to regulate its output current, which allows for improved efficiency and reduced EMI. It is designed to optimize the inductor and capacitor size while minimizing the switching losses.

The LM3502SQX-44 has an internally-programmable frequency scaling feature, where the switching frequency can be programmed to minimize the ripple current of the inductor. Additionally, its wide-dimming and low-ripple features allow for smooth, low-ripple dimming performance and a high degree of accuracy in dimming range. It also features programmable pre-biased feed-forward control and selectable pulse-skip frequencies, as well as advanced protection features such as overtemperature protection and open-loop protection.

The device is able to sense LED control signals and LED current to ensure that LED light is always running at optimal levels with the lowest possible power consumption. This PMIC also has a unique feature that allows for setting the minimum and maximum LED current, which is beneficial for users who want to customize the LED current based on their individual requirements. In sum, the LM3502SQX-44 offers many useful and efficient features to enable reliable operation for LED lighting.

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