LP3311 Datasheet, PDF (1/8 Pages) Lowpower Semiconductor inc – 1.3MHzFixed-Frequency PWM Operation

Preliminary Datasheet
LP3311
High Performance, Constant Current Switching
Regulator For 10PCS White LED In Series
General Description
The LP3311 is a 1.3MHz PWM boost switching
regulator designed for constant- current white LED
driver applications. The LP3311 can drive a string of
up to 10 white LEDs in series, ensuring uniform
brightness and eliminating several ballast resistors.
The LP3311 implements a constant frequency
1.3MHz 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 195 mV and 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
LP3311
-
OVP Voltage
029:29V
042:42V
F: Pb-Free
Package:
B6: SOT23-6
FB Voltage
Default: VFB=200mV
A: VFB=300mV
Pin Configurations
Features
High Efficiency: 90% 　
1.3MHzFixed-Frequency PWM Operation
Maximum Output Voltage up to 40V
Operating Range : 2.7V to 5.5V
Shutdown Supply Current:<1uA 　
Available in SOT23-6 Package 　
Built-in 40V 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
10uF
4.7uH
Cout
1uF
6
5
Vin OVP
PWM
4
EN
3
FB
LP3311
R1
10
Marking information
Please view website.
(SOT23-6)
LP3311 – 00 Version 1.0 Datasheet
Feb.-2011
www.lowpowersemi.com
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