MPQ3369-AEC1 Synchronous Step-UpConverter

The MPQ3369-AEC1 from Monolithic Power Systems is a step-up converter with six channel current sources designed to drive white LED arrays as backlighting in small-to-midsize LCD panels. The MPQ3369-AEC1 uses peak current mode as its PWM control architecture to regulate the boost converter. Six channel current sources are applied to the LED cathode to adjust the LED brightness. The device regulates each LED string's current to the value set via an external current-setting resistor with 2.5% current regulation accuracy between strings. The MPQ3369-AEC1 employs a low on-resistor MOSFET and a low headroom voltage, designed for higher efficiency. It has a standard I²C digital interface for ease of use, and the switching frequency can be programmed by a resistor, I²C interface, or external clock. The device provides analog, PWM, and mix dimming mode with a PWM input. The dimming mode can be selected with the I²C interface or the MIX/AD pin. It also has a phase shift function to eliminate noise during PWM dimming. Robust protections are included to guarantee the safe operation of the device. Protection modes include overcurrent protection (OCP), overvoltage protection (OVP), overtemperature protection (OTP), LED short, and open protection. There is also an option that automatically decreases the LED current at higher temperatures, and the device is available in QFN-24 (4 mm x 4 mm) and TSSOP28-EP packages..