LP3383 Datasheet, PDF (1/9 Pages) Lowpower Semiconductor inc – 1.2MHzFixed-Frequency PWM Operation

Preliminary Datasheet
LP3383
High Performance, Constant Current Switching
Regulator For 51PCS White LED
General Description
The LP3383 is a 1.2MHz PWM boost switching
regulator designed for constant- current white LED
driver applications. The LP3383 can drive a string of
up to 8 white LEDs in series, ensuring uniform
brightness and eliminating several ballast resistors.
The LP3383 implements a constant frequency
1.2MHz PWM control scheme. The high frequency
PWM operation also saves board space by reducing
external component sizes. To improve efficiency, the
feedback voltage is set to 300mV, which reduces
the power dissipation in the current setting resistor.
Highly integration and internal compensation
network minimizes as 5 external component counts.
Optimized operation frequency can meet the
requirement of small LC filters value and low
operation current with high efficiency.
Ordering Information
LP3383
F: Pb-Free
Package:
B6: SOT23-6
Pin Configurations
Features
High Efficiency: 92% 　
1.2MHzFixed-Frequency PWM Operation
Maximum Output Voltage up to 29V
Operating Range : 2.7V to 5.5V
Shutdown Supply Current:<1uA 　
Available in SOT23-6 Package 　
Built-in 29V Over Voltage Protection 　
Minimize the External Component
RoHS Compliant and 100% Lead (Pb)-Free
Applications
WLED Backlight driver
OLED Backlight driver
PDA
MID/PTV
Typical Application Circuit
Vin
Cin
22uF
4.7uH
Cout
10uF
6 _{Vin OVP} 5
4 _EN
FB ³
LP3383
Panel
Rset
2
Marking information
Part Number
Top Marking Package
LP3383B6F
F7
SOT23-6
Other Information please view website:
www.lowpowersemi.com.
(SOT23-6)
LP3383 – 00 Version 1.0 Datasheet OCT.-2012
www.lowpowersemi.com
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