The MAX16809/MAX16810 are integrated, high-efficiency white or RGB LED drivers. They are designed for LCD backlighting and other LED lighting applications with multiple strings of LEDs. The MAX16809/ MAX16810's current-mode PWM controller regulates the necessary voltage to the LED array. Depending on the input voltage and LED voltage range, it can be used with boost or buck-boost (SEPIC) topologies. The MAX16809/MAX16810 LED drivers include 16 open-drain, constant-current-sinking LED driver outputs rated for 36V continuous operation. The LED currentcontrol circuitry achieves 3% current matching among strings and enables paralleling of outputs for LED string currents higher than 55mA. The output-enable pin is used for simultaneous PWM dimming of all output channels. Dimming frequency range is 50Hz to 30kHz and dimming ratio is up to 5000:1. The constant-current outputs are single resistor programmable and the LED current can be adjusted up to 55mA per output channel. The MAX16809/MAX16810 operate either in stand-alone mode or with a microcontroller (C) using an industrystandard, 4-wire serial interface. The MAX16810 includes a watchdog and circuitry that automatically detects open-circuit LEDs.