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LM3502 Step-Up Converter for White LED Applications

September 2005

LM3502

Step-Up Converter for White LED Applications

General Description

The LM3502 is a white LED driver for lighting applications.

For dual display or large single white LED string backlighting

applications, the LM3502 provides a complete solution. The

LM3502 contains two internal whitle LED current bypass

FET(Field Effect Transitor) switches that are ideal for con-

troling dual display applications. The while LED current can

be adjusted with a PWM signal directly from a microcontrol-

ler without the need of an RC filter network.

With no external compensation, cycle-by-cycle current limit,

over-voltage protection, and under-voltage protection, the

LM3502 offers superior performance over other application

specific standard product step-up white LED drivers.

Features

n

Drive up to 4, 6, 8 or 10 white LEDs for Dual Display

Backlighting

n

>

80% efficiency

n

Output Voltage Options: 16V , 25V , 35V, and 44V

n

Input Under-Voltage Protection

n

Internal Soft Start Eliminating Inrush Current

n

1 MHz Constant-Switching Frequency

n

Wide Input Voltage: 2.5V to 5.5V

n

Small External Components

n

Low Profile Packages:

<

1 mm Height

-10 Bump MicroSMD

-16 Pin LLP

Applications

n

Dual Display BackLighting in Portable Devices

n

Cellular Phones and PDAs

Typical Application

20131701

FIGURE 1. Blacklight Configuration with 10 White LEDs

漏 2005 National Semiconductor Corporation

DS201317

www.national.com

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