The HT1635B with LED Drivers LQFP-64 RoHS is a 64-pin low-power CMOS IC manufactured by Holtek for use in driving LED displays. It features high-efficiency current-mode pulse width modulation (PWM) control, offering up to 16 channels of 8-bit gray-scale control. The chip is RoHS compliant offering improved operating efficiency while reducing electromagnetic interference in applications such as LED signage, LED lighting, and LED screens. It integrates low dropout regulators, programmable pulse generation, and protection circuitries, providing enhanced design flexibility. The device runs at 3V-5.5V operating voltage, with low power operation up to 0.3µA in shutdown mode and typical current draw of 1mA. Additionally, it has a working temperature range of -20°C to +85°C.