FAN5331

FAN5331 High Efficiency Serial LED Driver and OLED Supply with 20V Integrated Switch August 2005 FAN5331 High Efficiency Serial LED Driver and OLED Supply with 20V Integrated Switch Features ■ 1.6MHz Switching Frequency ■ Low Noise ■ Low RDS(ON): 0.5Ω ■ Adjustable Output Voltage ■ 1A Peak Switch Current ■ 1W Output Power Capability ■ Low Shutdown Current: <1µA ■ Cycle-by-Cycle Current Limit ■ Over-Voltage Protection ■ Fixed-Frequency PWM Operation ■ Internal Compensation ■ 5-lead SOT-23 Package Applications ■ Cell Phones ■ PDAs ■ Handheld Equipment ■ Display Bias ■ LED Bias Typical Application VIN 2.7V to 5.5V CIN 4.7µF 5 VIN Description The FAN5331 is a general purpose, fixed-frequency boost converter designed to operate at high switching frequencies in order to minimize switching noise measured at the battery terminal of hand-held communications equipment. Quiescent current in normal mode of operation as well as in shutdown mode is designed to be minimal in order to extend battery life. Normal mode of operation or shutdown mode can be selected by a logic level shutdown circuitry. The low ON-resistance of the internal N-channel switch ensures high efficiency and low power dissipation. A cycle-by-cycle current limit circuit keeps the peak current of the switch below a typical value of 1A. The FAN5331 is available in a 5-lead SOT23 package. L 10µH BAT54 SW 1 R1 VOUT COUT 4.7µF CF 120pF 3 FB FAN5331 ON OFF 4 SHDN 2 GND R2 ©2004 Fairchild Semiconductor Corporation FA...