FAN5331

FAN5331 High Efficiency Serial LED Driver and OLED Supply with 20V Integrated Switch

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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): 0.5 Adjustable Output Voltage 1A Peak Switch Current 1W Output Power Capability Low Shutdown Current: 1 A Cycle-by-Cycle Current Limit Over-Voltage Protection Fixed-Frequency PWM Operation Internal Compensation 5-lead SOT-23 Package

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.

Applications
Cell Phones PDAs Handheld Equipment Display Bias LED Bias

Typical Application
VIN CIN 4.7 F 5 VIN 1 R1 CF 120pF 2.7V to 5.5V L 10 H BAT54 COUT 4.7 F VOUT

FAN5331

R2 ON OFF 4 SHDN GND 2

Figure 1. Typical Application Diagram
2004 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FAN5331 Rev. 1.0.1