LM3503SQX-35/NOPB

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Power management integrated circuits (PMICs) provide essential solutions for managing multiple power sources for consumer and computing applications. Among PMICs, LED drivers play an important role in powering LED applications. The LM3503SQX-35/NOPB is an LED driver integrated circuit (IC) from Texas Instruments. It is a constant current LED driver that features wide input and output voltages, adjustable 500mA current, programmable slew rate and soft start, high accuracy current regulation, and a logic-controlled power-down mode.

The LM3503SQX-35/NOPB is designed for driving high brightness LEDs (HB-LEDs) in automotive and commercial applications. It operates from a wide input voltage range of 6-40V and its output voltage can be regulated up to 40V for driving single or multiple LEDs. The LM3503SQX-35/NOPB integrates a low RDS(on) internal power switch with a 500mA maximum current output. The S/N mode allows control of the string current with external logic levels. The high precision current regulation loop features a 3% accuracy over a large temperature range (automotive grade -40°C to +125°C). The output current is programmable via a single resistor. In addition, the LM3503SQX-35/NOPB features adjustable slew rate and soft start to improve EMI, and a logic-controlled power-down mode to reduce standby power consumption.

The LM3503SQX-35/NOPB offers excellent output voltage and current accuracy, enabling designers to create more efficient, reliable, and cost-effective LED applications. Its adjustable slew rate and soft start capabilities help to minimize EMI and reduce power consumption. In addition, its low-RDS(on) power-switch allows for efficient power delivery, resulting in improved system efficiency. Furthermore, its wide input and output voltage range make the LM3503SQX-35/NOPB an ideal choice for driving LED applications in automotive, commercial, and industrial applications.

The LM3503SQX-35/NOPB operates generally in three modes. In the Boost mode, the LM3503SQX-35/NOPB draws power from the input power source and stores the energy into a built-in inductor. This energy is used to power the LED strings when the input voltage falls below the desired LED string voltage. In the Buck and Buck-Boost modes, the LM3503SQX-35/NOPB will regulate the current to the LED strings within the output voltage window, modulating the input and output switches to transfer power from the input to the output. In the shutdown mode, all of the control functions are turned off, placing the IC into a low-power state.

In summary, the LM3503SQX-35/NOPB is an integrated circuit from Texas Instruments designed for driving large numbers of LEDs. It has many features that make it suitable for automotive, commercial, and industrial LED applications. It operates from a wide input and output voltage range, and offers a variety of protection and performance features for increased efficiency, reliable operation, and lower system cost.

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