AOZ1935

AOZ1934/1935 High Efficiency Boost 20-, 30- LED Driver General Description The AOZ1934/5 is an ideal power solution for white LED backlighting for medium to small size LCD panels. It is a highly integrated step up DC-DC converter with input voltage range from 2.7V to 25V, accommodating 1-, 2-, 3-, or 4-cell lithium ion batteries or 3.3V, 5V, 12V or 20V regulated supplies. The AOZ1934/5 integrates a 40V power MOSFET as well as compensation and soft start circuitry, which results in a simpler and smaller solution with much fewer external components. A high switching frequency (800kHz) allows the use of a smaller inductor and capacitor to further reduce the solution size. Each of the regulated current sinks in the AOZ1934/5 provides 20mA factory programmed current. With a maximum of 40V at the output of the step-up converter, each string can connect up to ten LEDs in series, for a total of 20 LEDs for AOZ1934 and 30 LEDs for AOZ1935. The AOZ1934/5 is equipped with fast PWM dimming control for wide dimming range and has an enable pin for IC ON/OFF control. Various protection features are built into the AOZ1934/5, including cycle-by-cycle input current limit protection, output over-voltage protection, LED fault (open or short) protection and thermal shutdown protection. The leakage current in shutdown mode is 0.1µA. The AOZ1934/5 is available in a 16-lead 3 x 3 x 0.75mm thin QFN package. Features z Wide input range: 2.7V to 25V z Drive up to 30 LEDs – AOZ1934 up to 20 LEDs (10s2...