FAN5333A

FAN5333A/FAN5333B High Efficiency, High Current Serial LED Driver with 30V Integrated Switch

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FAN5333A/FAN5333B High Efficiency, High Current Serial LED Driver with 30V Integrated Switch

August 2005

FAN5333A/FAN5333B High Efficiency, High Current Serial LED Driver 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: 1 A Cycle-by-Cycle Current Limit Low Feedback Voltage Over-Voltage Protection Fixed-Frequency PWM Operation Internal Compensation FAN5333A has 110mV Feedback Voltage FAN5333B has 315mV Feedback Voltage Thermal Shutdown 5-Lead SOT23 Package

Description
The FAN5333A/FAN5333B is a general purpose 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 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 FAN5333A/FAN5333B is available in a 5-lead SOT23 package.

Applications
Cell Phones PDAs Handheld Equipment Display Bias LED Bias Flash LED

Typical Application
VIN 4.7 F to 10 F CIN L 6.8 H to 10 H 0.1 F to 2.2 F 5 VIN SW 1 BAT54 COUT VOUT

ILED

ILED1

ILED2

FAN5333

ON OFF

SHDN

GND

Figure 1. Typical Application Diagram

2005 Fairchild Semiconductor Corporation

www.fairchildsemi.com