FAN5330

FAN5330 High Efficiency Serial LED Driver with 30V Integrated Switch

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FAN5330 High Efficiency Serial LED Driver with 30V Integrated Switch

August 2005

FAN5330 High Efficiency Serial LED Driver with 30V Integrated Switch
Features
1.5MHz Switching Frequency Low Noise Adjustable Output Voltage 0.7W Output Power Capability Low Shutdown Current: 1 A Cycle-by-Cycle Current Limit Low Feedback Voltage (110mV) Over-Voltage Protection Fixed-Frequency PWM Operation Internal Compensation Thermal Shutdown 5-Lead SOT23 Package

Description
The FAN5330 is an LED driver that features fixed frequency mode operation and an integrated FET switch. This device is 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 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 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 1.5A. The FAN5330 is available in a 5-lead SOT23 package.

Applications
Cell Phones PDAs Handheld Equipment Display Bias LED Bias

Typical Application
BAT54 COUT 0.47 F ILED 5 V
IN

VIN CIN 2.2 F

L 6.8 H to 10 H

VOUT

FAN5330

ON OFF

SHDN

GND

Figure 1. Typical Application Diagram

2005 Fairchild Semiconductor Corporation

www.fairchildsemi.com