MP3359C

The MP3359C is a step-up controller with four channel current sources. The device is designed to drive white LED (WLED) arrays as backlighting for small or medium-sized LCD panels. The MP3359C is a boost controller that uses peak current control mode as its pulse-width modulation (PWM) control architecture to regulate a boost converter, which is composed of input capacitors, inductors, MOSFETs, diodes, output capacitors, etc. It drives an external MOSFET to boost the output voltage (VOUT) from a 3.5V to 40V input voltage (VIN) supply. The switching frequency (fSW) can be configured via a resistor or external clock. Four channel current sources are applied to the LED cathode to adjust LED brightness. The MP3359C 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. A low headroom voltage is provided to improve efficiency and IC thermal performance. The MP3359C provides analog and PWM dimming with two separate input pins (EN/ADIM and PDIM, respectively). The device also has a fixed delay time between LED current (ILED) channels to eliminate noise during PWM dimming. Robust protections are included to guarantee safe device operation. Protection features include input current (IIN) over-current protection (OCP), cycle-by-cycle current limiting, over-voltage protection (OVP), over-temperature protection (OTP), LED short/open protection, LEDx short-to-GND protection, and VOUT short to-GND protection. The MP3359C is available in a QFN-20 (3mmx4mm) package.