Preliminary Datasheet

LP3303

LP3303 –03 Ver. 1.3 Datasheet

Feb.-2009

Page 1 of 7

No Schttoy,

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.

Ordering Information

LP3303

F:

Pb-Free

B6:SOT23-6

Pin Configurations

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

Typical Application Circuit

22uH

LP3303

4

3

6

5

CTRL

FB

VIN

OUT

Rset

1uF

VIN

1uF

10R

Marking information