FAN5330 Datasheet, PDF (1/10 Pages) Fairchild Semiconductor – 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: <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
V_IN
C_IN
2.2µF
L
6.8µH to 10µH
5
V
IN
SW ¹
BAT54
0.47µF
C_OUT
I_LED
3
FB
V_OUT
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