LC3300

LC3300 - Max. 3MHz, Variable Frequency Step-up DC/DC Converter DESCRIPTION The LC3300 variable frequency step-up Converter drives white LEDs with a constant current to provide backlight in cell phones, PDAs, and other hand-held devices. It features allowing series connection of the white LEDs so that the LED currents are identical for uniform brightness. An enable input can be pulsed repeatedly to adjust LEDs brightness. The fast 3MHz operation frequency allows for smaller capacitor and inductor. Fault condition protection uses cycle-by cycle current limiting to sense maximum inductor current and over-voltage protection. The 0.2V low reference voltage minimized the power loss across the current sense resistor. The converter can operate from 2V to 6V, and capable of delivering maximum 200mA output current at 4-LEDs application with 3V input voltage. Quiescent current drawn from power source is as low as 120uA. All of these features make LC3300 be suitable for the portable devices, which are supplied by a single battery. LC3300 is available in SOT23-6 package that is PB free. FEATURES Up to 24V Output Voltage Wide Operation Range: 2V to 6V Maximum 3MHz Operating Frequency PWM Dimming Control Shutdown Current <1uA Current Limit Cycle-by-Cycle Low Current Sense Threshold: 200mV 24V Over Output Voltage Protection Compact SOT23-6 Package APPLICATIONS Compact Back Light Module Power Source for LED Constant Current Source TYPICAL APPLICATION L1 VIN 10u...