The MP3384L is a step-up converter to control up to 4 white LED strings for LCD backlighting. The MP3384L employs a fixed-switching frequency that can be selected from either 625kHz or 1.25MHz. It takes a 3V-to-25V input supply: The low-end input voltage allows the MP3384L to power a tablet display from a single battery. The MP3384L has 4 internal current sources to independently regulate the current in each LED string to a value set by an external, current-setting resistor. It achieves current balance within 2.5% regulation accuracy between strings. Its low 600mV regulation voltage for the LED current sources reduces power loss and improves efficiency. The MP3384L features multiple protections, including under-voltage lockout, MOSFET current limiting, over-voltage protection, open/short LED protection, and thermal shut-down. The MP3384L is available in a 3mm×3mm QFN16 package.
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The EV3384EQ-00A is an evaluation board for the MP3384, a step-up converter designed for liquid-crystal displays that employ an array of LEDs as the light source. It can drive 4 strings in parallel and 10 LEDs per string.
The MP3384 uses internal switch current mode, fixed frequency architecture and includes current ballast in each string terminal, which achieves 2.5% current regulation accuracy between strings. Low feedback voltage at each LED string help reduce power loss and improve efficiency.
The MP3384 has multiple features to protect the converter from fault conditions, including 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.