LP3303 Datasheet, PDF (1/7 Pages) Lowpower Semiconductor inc – High Performance, Constant Current Switching Regulator For 9PCS White LED

Preliminary Datasheet
LP3303
No Schttoy,
High Performance, Constant Current Switching Regulator
For 9PCS White LED
General Description
The LP3303 is a 1.0MHz PWM boost switching
regulator designed for constant- current white LED
driver applications. The LP3303 can drive a string of
up to 8 white LEDs from a 3.6V in series, ensuring
uniform brightness and eliminating several ballast
resistors. The LP3303 implements a constant
frequency 1.0MHz 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 200mV,
which reduces the power dissipation in the current
setting resistor.
Highly integration and internal compensation
network minimizes as 3 external component counts.
Optimized operation frequency can meet the
requirement of small LC filters value and low
operation current with high efficiency.
Ordering Information
LP3303
Pin Configurations
F: Pb-Free
B6:SOT23-6
Features
High Efficiency: 86% 
1.2MHzFixed-Frequency PWM Operation
Maximum Output Voltage up to 28V
Operating Range : 2.7V to 16V
Shutdown Supply Current:<1uA 
Available in SOT23-6 Package 
Built-in Over Voltage Protection 
Minimize the External Component
RoHS Compliant and 100% Lead (Pb)-Free
Applications
WLED Blacklight driver
OLED Blacklight driver
PDA
DSC
Camera Flash WLED driver
Typical Application Circuit
VIN
22uH
1uF
1uF
6 _VIN
OUT ⁵
LP3303
4
CTRL
3
FB
Rset
10R
Marking information
Please view website.
LP3303 –03 Ver. 1.3 Datasheet Feb.-2009
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