The LP3305A is a white LED driver for LED backlighting applications. A Boost converter is built in to Boost output voltage up to 30V with 32V over voltage protection. The high-efficiency Boost converter runs at 1MHz allowing low-profile inductor and ceramic capacitors.
The white LED current is programmed with a resistor connected at FB pin. The voltage at FB pin is regulated at 200mV at full scale. A PWM signal can be applied to CTRL pin to adjust DC voltage at FB pin and thus program LED current without generating audible noise. LP3305A supports 0.3%-100% PWM dimming at wide frequency range between 10kHz and 100kHz with high accuracy of regulation.
LP3305A offers low noise, small size, high efficiency and robust protections. The protection features include under-voltage lockout (UVLO), internal soft-start, Boost cycle-by-cycle current limit, output over-voltage protection for LED open fault as well as thermal shutdown. The LP3305A is available in SOT23-6 package.
