Preliminary Datasheet

LP3311S

LP3311s – 02 Version 2.0 Datasheet

May.-2013

www.lowpowersemi.com

Page 1 of 7

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

F: Pb-Free

Package:

B6: SOT23-6

Pin Configurations

IN

EN

SW

OVP

FB

1

2

3

4

6

SOT-23-6

GND

5

Features



High Efficiency: 90% 



1MHz Fixed-Frequency PWM Operation



Maximum Output Voltage up to 29V



Operating Range : 2.7V to 5.5V



Shutdown Supply Current:<1uA 



Available in SOT23-6 Package 



Built-in 29V Over Voltage Protection 



Minimize the External Component



RoHS Compliant and 100% Lead

(Pb)-Free

Applications





OLED Backlight driver



PDA



MID/PTV

Typical Application Circuit

1uF

4.7uH

10uF

Vin

GND

EN

FB

Vin

SW

OVP

LP3311S

R1