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This literature is subject to all applicable copyright laws and is not for resale in any manner.FAN5333A/FAN5333B High Efciency, High Current Serial LED Driver with 30V Integrated Switch August 2005 FAN5333A/FAN5333B High Efciency, High Current Serial LED Driver with 30V Integrated Switch Features Description 1.5MHz Switching Frequency The FAN5333A/FAN5333B is a general purpose LED driver that features xed frequency mode operation and an integrated FET Low Noise switch. The devices high output power makes it suitable to drive Adjustable Output Voltage ash LEDs in serial connections. This device is designed to Up to 1.5A Peak Switch Current operate at high switching frequencies in order to minimize 1.5W Output Power Capability switching noise measured at the battery terminal of hand-held Low Shutdown Current: <1A communications equipment. Quiescent current in both normal and shutdown mode is designed to be minimal in order to Cycle-by-Cycle Current Limit extend battery life. Normal or shutdown mode can be selected Low Feedback Voltage by a logic level shutdown circuitry. Over-Voltage Protection The low ON-resistance of the internal N-channel switch ensures Fixed-Frequency PWM Operation high efciency and low power dissipation. A cycle-by-cycle cur- Internal Compensation rent limit circuit keeps the peak current of the switch below a FAN5333A has 110mV Feedback Voltage typical value of 1.5A. The FAN5333A/FAN5333B is available in FAN5333B has 315mV Feedback Voltage a 5-lead SOT23 package. Thermal Shutdown 5-Lead SOT23 Package Applications Cell Phones PDAs Handheld Equipment Display Bias LED Bias Flash LED Typical Application BAT54 V L OUT V IN C 6.8H to 10H IN C OUT 4.7F to 0.1F 10F to 2.2F I I I LED LED1 LED2 5 1 SW V IN 3 FB R R2 R1 ON 4 2 SHDN GND OFF Figure 1. Typical Application Diagram 2005 Fairchild Semiconductor Corporation 1 www.fairchildsemi.com FAN5333A/FAN5333B Rev. 1.0.1 FAN5333