The MP3384 is a step-up converter with 4-channel current sources designed for driving the white LED arrays for large size LCD panel backlighting applications. The MP3384 uses current mode, fixed frequency architecture. The switching frequency can be selected at 1.25MHz or 625kHz. It generates an output voltage up to 50V from a 4.5V to 25V input supply. The MP3384 independently regulates the current in each LED string to the user programmed value set by an external current setting resistor. The MP3384 applies 4 internal current sources to achieve a current balance of 2.5% regulation accuracy between strings. Its low 600mV regulation voltage on LED current sources reduces power loss and improves efficiency. The MP3384 includes under voltage lockout, current limiting, over voltage, short LED, open LED and thermal shut-down protection. The MP3384 is available in small QFN16 (3mmx 3mm) package.High Efficiency and Small Size 4.5V to 25V Input Voltage Range 50V Maximum Step-up Voltage Balanced Driver for 4 Strings of WLED 2.5% Current Matching Accuracy Between Strings Selectable Switching Frequency: 1.25MHz or 625kHz PWM Dimming Programmable Over-voltage Protection Under Voltage Lockout Open and Short LED Protection Thermal Shutdown Small 16-pin QFN (3mm x 3mm)