Preliminary Datasheet
No Schttoy,
LP3303
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.
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
Ordering Information
LP3303
F:
Pb-Free
Typical Application Circuit
VIN
22uH
1
1uF
6
1uF
5
VIN
LP3303
CTRL
GND
4
FB
3
B6:SOT23-6
Pin Configurations
2
SW
OUT
Rset
10R
Marking information
Please view website
.
LP3303 –03 Ver. 1.3 Datasheet
Feb.-2009
Page 1 of 7
POWER [ LOWPOWER SEMICONDUCTOR INC ]
