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GENERAL DESCRIPTION The ZCC3302 is a 7.5V step-up DC/DC converter designed for driving up to single 10-series or 9x3-series WLEDs from a single cell Lithium Ion- battery. The ZCC3302 uses current mode, fixed frequency architecture to regulate the LED current, which is measured through an external current sense resistor. Its low 300mV feedback voltage reduces power loss and improves efficiency. The ZCC3302 supports hig- h frequency PWM Dimming through EN pin. The ZCC3302 is turned off if an open-circuit condition is presented. Please be noted that open-circuit condition is not the same as over-voltage condition.. Please refer to the OPERATION DESCRIPTION and APPLICATION INFORMATION sections for more detail. The ZCC3302 includes soft-start, under-voltage locko- ut, current limiting and thermal overload protections. The ZCC3302 is available in SOT23-6 package. FEATURES Operating Voltage: 2.5-7.5V Maximum Output Voltage: 35V, capable of driving 10-series White LED strings Maximum drive Capability: 9x3-series or 6x6-series. Up to 90% Efficiency 1.25MHz Fixed Switching Frequency Low 300mV Feedback Voltage Support PWM Dimming Open-circuit Protection UVLO, Soft-Start and Thermal Shutdown Internal 1.5A Current Limit SOT23-6 Package APPLICATIONS 5~7” LCD Panels Handheld Computers and PDAs Digital Cameras Small LCD Displays |
