Preliminary Datasheet

LP3133

LP3133 – Ver. 1.0 Datasheet

Feb.-2008

Page 1 of 5

4-Channel Current Source White LED Driver

General Description

The LP3133 is a low-dropout bias supply for white LEDs is

a high-performance alternative to the simple ballast

resistors used in conventional white LED designs. It

supports 4 white LEDs with regulated constant current for

uniform intensity. The LP3133 maintains low dropout

current regulators. The LP3133 requires a 50mV dropout

at a 20mA load on each output to match the LED brightness.

The brightness of LEDs can be tuned through a pulse width

modulated signal at the PWM pin.

The LP3133 is available in a QFN-16 package.

Order Information

LP3133 -

□ □ □

F: Pb-Free

Package Type

QV: QFN-16

Applications

LCD Panel

Cellular and Smart mobile phone

PDA/DSC

PMP

Features

2.7V to 6V Input Voltage

20mA maxim sink current

PWM tuned LED brightness through PWM

pin(200Hz-10KHz)

Soft Start Function

Built-in Thermal Protection

QFN-16 Package

RoHS Compliant and 100% Lead (Pb)-Free

Typical Application Circuit

VBATT

1uF

PWM

LP3133

7

15

13

1

8

16

14

2

6

5

4

3

9

11

10

12

PGND

EN

VIN

NC

VOUT

EN

GND

NC

LED1

LED2

LED3

LED4

NC

NC

NC

NC

Marking Information

Please see website.