The EVQ3359A-LE-00A is an evaluation board designed to demonstrate the capabilities of the MPQ3359A-AEC1 and MP3359A, which are four-channel, step-up converters that drive white LED (WLED) arrays as backlighting for small- or medium-sized LCD panels. The MPQ3359A-AEC1 will be used throughout to refer to both devices, unless otherwise specified.

Peak current control is used as the pulse-width modulation (PWM) control architecture to regulate the boost converter. Four channel current sources are applied to the LED cathode to adjust LED brightness. This regulates the current in each LED string to the value set by an external current-setting resistor, with a 2.5% current regulation accuracy between strings.

The MPQ3359A-AEC1’s low on resistance (R_DS(ON)) MOSFET and headroom voltage improves efficiency. The switching frequency (f_SW) is configurable via a resistor or an external clock.

The MPQ3359A-AEC1 provides analog and PWM dimming via the EN/ADIM and PDIM pins, respectively. The device also has a fixed delay time between LED current (I_LED) channels to eliminate noise during PWM dimming.

Protection features include input over-current protection (OCP), inductor current OCP, over-voltage protection (OVP), over-temperature protection (OTP), LED string short protection, LED string open protection, output voltage (V_OUT) short-to-GND protection, and LEDx pin short-to-GND protection.

The EVQ3359A-LE-00A is a fully assembled evaluation board. The MPQ3359A-AEC1 and MP3359A are available in a QFN-20 (3mmx4mm) package, and the MPQ3359A-AEC1 is AEC-Q100 Grade 1 qualified.