LP8543SQ/NOPB Integrated Circuits (ICs)

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The LP8543SQ/NOPB is an integrated circuit for LED display and backlighting.  It is a power management and LED driver IC (PMIC - LED Drivers) that integrates a microcomputer, driver circuits for LEDs, and a backlight dimming circuit.  Its main function is to supply standard current to each LED bit, lighting the LED with uniform brightness, and thereby forming a uniform backlight.  It can be applied to input/output level, backlight power supply management, port protection, and other system designs.

The LP8543SQ/NOPB combines single-channel feedback control with a linear current regulator to ensure a uniform current to the LEDs with high accuracy.

The LP8543SQ/NOPB works in two stages, pre-driver and main control.  In the pre-driver stage, the LP8543SQ/NOPB uses an external analog dimming interface, such as pulse width modulation (PWM) or an analog voltage, or other interface, to receive an analog signal and then convert it into a digital signal for PWM dimming control.  In the main control stage, the LP8543SQ/NOPB takes the PWM signals from the pre-driver stage and adjusts the current of each LED bit using current feedback control.

The application field of the LP8543SQ/NOPB includes slim LED displays, LED backlighting control, mobile devices, and other LED display control applications.  It can be used to control LED brightness for backlighting of mobile device displays, LED displays and advertising panels, as well as for LED lighting applications.

The LP8543SQ/NOPB is designed to meet IEC-specifications, meaning it is safe and reliable for a wide range of applications.  It offers built-in protection features, such as short circuit protection and over-current protection, over-temperature protection (minimum Celsius), temperature compensation, open circuit detection, and power-on reset.  The LP8543SQ/NOPB operates with either VDD or VCC supply, with a wide input voltage range of 2.3 to 5.5 volts (VDD) or 3.3 to 6.5 volts (VCC).  It is also power-down compatible and automatically reduces LED current to zero when power is off.

The LP8543SQ/NOPB is an efficient and reliable LED driver for LED display and backlighting applications.  It is ideal for battery-powered applications because of its low power consumption, accurate current regulation, and wide operating temperature range.  By utilizing the LP8543SQ/NOPB, designers can simplify and reduce the size of their design while maintaining uniform brightness and high efficiency.

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