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©2004 Fairchild Semiconductor Corporation 1 www.fairchildsemi.com August 2005 FAN5332A Rev. 1.0.1 FAN5332A High Efficiency, High Current Serial LED Driver and OLED Supply with 30V Integrated Switch Features ■ 1.5MHz Switching Frequency ■ Low Noise ■ Adjustable Output Voltage ■ Up to 1.5A Peak Switch Current ■ 1.5W Output Power Capability ■ Low Shutdown Current: <1µA ■ Cycle-by-Cycle Current Limit ■ Over-Voltage Protection ■ Fixed -Frequency PWM Operation ■ Soft Start ■ Internal Compensation ■ Thermal Shutdown ■ 5-lead SOT-23 Package Applications ■ Cell Phones ■ PDAs ■ Handheld Equipment ■ Display Bias ■ LED Bias ■ Flash LED Description The FAN5332A is an LED driver that features fixed frequency mode operation and an integrated FET switch. The device’s high output power makes it suitable to drive flash LEDs in serial connections. This device is designed to operate at high switch- ing frequencies in order to minimize switching noise measured at the battery terminal of hand-held communications equipment. Quiescent current in both normal and shutdown mode is designed to be minimal in order to extend battery life. Normal or shutdown mode can be selected by a logic level shutdown cir- cuitry. The low ON-resistance of the internal N-channel switch ensures high efficiency and low power dissipation. A cycle-by-cycle cur- rent limit circuit keeps the peak current of the switch below a typical value of 1.5A. The FAN5332A is available in a 5-lead SOT23 package. Typical Application Figure 1. Typical Application Diagram SHDN VIN VOUT R1 R2 GND VIN FB SW CF CIN 6.8µH 1 3 2 4 5 10 µF 82pF COUT L BAT54 2.2 µF 2.7V to 5.5V ON OFF |
