24-channel I2C constant-current RGB LED driver

In smart homes and other applications that use

human-machine-interaction, high-performance RGB LED drivers are required. LED

animation effects such as flashing, breathing, and chasing greatly improve user

experience, and minimal system noise is essential.

The LP50xx device is an 18- or 24-channel constant

current sink LED driver. The LP50xx device

includes integrated color mixing and brightness

control, and pre-configuration simplifies the

software coding process. Integrated 12-bit, 29kHz

PWM generators for each channel enable smooth,

vivid color for LEDs, and eliminate audible

noise.

The LP50xx device controls each LED

output with a 12-bit PWM resolution at 29kHz switching frequency, which helps

achieve a smooth dimming effect and eliminates audible noise. The independent color

mixing and intensity control registers make the software coding straightforward.

When targeting a fade-in, fade-out type breathing effect, the global R, G, B bank

control reduces the microcontroller loading significantly. The LP50xx device also

implements a PWM phase-shifting function to help reduce the input power budget when

LEDs turn on simultaneously.

The LP50xx device implements an

automatic power-saving mode to achieve ultralow quiescent current. When channels are

all off for 30ms, the device total power consumption is down to 10µA, which makes

the LP50xx device a potential choice for battery-powered end equipment.