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| LP3311S Datasheet, PDF (1/7 Pages) Lowpower Semiconductor inc – 1MHz Fixed-Frequency PWM Operation | |||
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Preliminary Datasheet
LP3311S
High Performance, Constant Current Switching
Regulator For 8PCS White LED In Series
General Description
The LP3311S is a 1MHz PWM boost switching regulator
designed for constant current white LED driver applications.
The LP3311S can drive a string of up to 8 white LED in
series, ensuring uniform brightness and eliminating several
ballast resistors. The LP3311S implements a constant
frequency 1MHz PWM control scheme. The high frequency
PWM operation also saves board space by reducing
external component size. To improve efficiency, the
feedback voltage is set to 200 mV, 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
LP3311S
Features
ï² High Efficiency: 90% ï
ï² 1MHz Fixed-Frequency PWM Operation
ï² Maximum Output Voltage up to 29V
ï² Operating Range : 2.7V to 5.5V
ï² Shutdown Supply Current:<1uA ï
ï² Available in SOT23-6 Package ï
ï² Built-in 29V Over Voltage Protection ï
ï² Minimize the External Component
ï² RoHS Compliant and 100% Lead (Pb)-Free
Applications
ï² ï WLED Backlight driver
ï² ï OLED Backlight driver
ï² ï PDA
ï² ï MID/PTV
F: Pb-Free
Package:
B6: SOT23-6
Pin Configurations
IN
OVP
EN
Typical Application Circuit
Vin
4. 7uH
10uF
1uF
Vin
SW
EN
OVP
6
5
4
GND
FB
LP3311S
R1
1
2
3
SW
GND
FB
SOT- 23- 6
LP3311s â 02 Version 2.0 Datasheet May.-2013
www.lowpowersemi.com
Page 1 of 7
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