The EVQ3364-R-00A is an evaluation board designed to demonstrate the capabilities of the MPQ3364, a four-channel step-up converter designed to drive white LED (WLED) arrays as backlighting for small- or medium-sized liquid crystal display (LCD) panels.

Peak current control is used as the pulse-width modulation (PWM) control architecture for regulating the boost converter. Four channel-current sources are applied to the LED cathode to adjust the LED brightness. This regulates the current in each LED string to the value set by an external current-setting resistor, with 2.5% current regulation accuracy between strings. The maximum current per channel is 150mA. The MPQ3364’s low on resistance MOSFET and low headroom voltage design improves efficiency. The device also has a standard, digital I²C interface for flexibility. The switching frequency (f_SW) can be configured via a resistor, I²C interface, or external clock. The MPQ3364 features three dimming modes: analog dimming, PWM dimming, and mixed dimming via the PWM input. The dimming mode can be selected via the I²C interface or MIX/AD pin. The IC also has a phase-shift function that eliminates noise during PWM dimming.

Protection features include over-current protection (OCP), over-voltage protection (OVP), over-temperature protection (OTP), LED short protection, and LED open protection. The LED current automatically decreases at high temperatures. The MPQ3364 is available in a QFN-24 (4mmx4mm) package.