LP3302S Datasheet, PDF (1/11 Pages) Lowpower Semiconductor inc – 1.1MHz Fixed-Frequency PWM Operation

Preliminary Datasheet
LP3302S
High Performance, Constant Current Switching
Regulator For White LED
General Description
The LP3302S is a 1.1MHz PWM boost switching
regulator designed for constant- current white LED
driver applications. The LP3302S can drive a string
of up to 8 white LEDs from a 3.3V supply or 3S9P
white LEDs from a 5V supply in series, ensuring
uniform brightness and eliminating several ballast
resistors. The LP3302S implements a constant
frequency 1.1MHz 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 250mV,
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
LP3302S
Features
High Efficiency: 88% 　
1.1MHz Fixed-Frequency PWM Operation
Maximum Output Voltage up to 27.5V
Operating Range : 2.7V to 6V
Shutdown Supply Current:<1uA 　
Available in T/SOT23-6 Package 　
Built-in Over Voltage Protection 　
Minimize the External Component
RoHS Compliant and 100% Lead Pb-Free
Applications
WLED Backlight driver
OLED Backlight driver
PDA
DSC
Camera Flash WLED driver
Typical Application Circuit
Vin
+ 1uF
4.7uH
1uF +
F:Pb-free
J6:TSOT23-6
B6: SOT23-6
Pin Configurations
6 _{Vin OUT} 5
4 _EN
FB ³
LP3302S
Marking information
Please view website.
SOT23-6/TSOT23-6
LP3302S –02 Version 1.2 Datasheet Feb.-2012 www.lowpowersemi.com
Page 1 of 11