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FAN5330

High Efficiency Serial LED Driver with 30V Integrated Switch

Fairchild Semiconductor 

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: <1µA

■ Cycle-by-Cycle Current Limit

■ Low Feedback Voltage (110mV)

■ Over-Voltage Protection

■ Fixed-Frequency PWM Operation

■ Internal Compensation

■ Thermal Shutdown

■ 5-Lead SOT23 Package

Applications

■ Cell Phones

■ PDAs

■ Handheld Equipment

■ Display Bias

■ LED Bias

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 cur-

rent 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.

Typical Application

VIN

CIN

2.2µF

L

6.8µH to 10µH

5

V

IN

SW 1

BAT54

0.47µF

COUT

ILED

3

FB

VOUT

ON

4 SHDN

2

GND

R

OFF

Figure 1. Typical Application Diagram

©2005 Fairchild Semiconductor Corporation

1

FAN5330 Rev. 1.0.1

www.fairchildsemi.com

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