LM3503ITL-16 National Semiconductor, LM3503ITL-16 Datasheet

LM3503ITL-16

Manufacturer Part Number

LM3503ITL-16

Description

Dual-Display Constant Current LED Driver with Analog Brightness Control

Manufacturer

National Semiconductor

Datasheet

1.LM3503ITL-16.pdf (20 pages)

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LM3503

Dual-Display Constant Current LED Driver with Analog

Brightness Control

General Description

The LM3503 is a white LED driver for lighting applications.

For dual display backlighting applications, the LM3503 pro-

vides a complete solution. The LM3503 contains two internal

white LED current bypass FET (Field Effect Transistor)

switches. The white LED current can be adjusted with a DC

voltage from a digital to analog converter or RC filtered PWM

(pulse-width-modulated) signal at the Cntrl pin.

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

output over-voltage protection, input under-voltage protec-

tion, and dynamic white LED current control capability, the

LM3503 offers superior performance over other step-up

white LED drivers.

Typical Application

DS201286

Features

n Drives up to 4, 6, 8 or 10 White LEDs for Dual Display

n Output Voltage Protection Options: 16V, 25V, 35V & 44V

n Input Under-Voltage Protection

n Internal Soft Start Eliminates Inrush Current

n 1 MHz Constant Switching Frequency

n Analog Brightness Control

n Wide Input Voltage Range: 2.5V to 5.5V

n Low Profile Packages:

Applications

n Dual Display Backlighting in Portable devices

n Cellular Phones and PDAs

Backlighting

— 10 Bump MicroSMD

— 16 Pin LLP

80% Peak Efficiency

1 mm Height

20128662

www.national.com

August 2006

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