LM4970

www.ti.com

SNVS312D – JANUARY 2005 – REVISED MAY 2013

LM4970

Audio Synchronized Color LED Driver

Check for Samples: LM4970

1

FEATURES

DESCRIPTION

The

LM4970

is

a

LED

driver

with

an

audio

2

•

Audio Synchronized Color LED Driver

synchronization mode that virtually eliminates the

•

User Defined LED Pattern, Color, and Intensity

need for real time software processing for LED

Capability

lighting effects. The LM4970 includes three individual

•

Programmable:

PWM color LED drivers that provide up to 42mA of

current drive for each PWM LED output.

–

LED Drive Current

The LM4970 features an audio synchronization mode

–

PWM Frequency

where the audio input signal that is mixed in from

–

High Pass Filter Frequency Select

three audio inputs is filtered into three frequency

–

Audio Input Signal Gain

bands, with each frequency band assigned to a

•

Eliminates External LED Current Limiting

specific PWM LED driver.

Resistors

The

PWM

LED

drivers

can

also

be

directly

•

applications where user defined LED pattern, color,

•

Ultra Low Shutdown Current

and intensity programmability is a priority.

APPLICATIONS

The LM4970 also features an audio input gain control

which allows the user to increase the gain if the audio

•

Cell Phones

input signal does not create a bright enough effect on

•

Portable MP3, CD, DVD, AAC players

the LEDs. The LM4970 is a feature rich LED driver

•

PDA's

that is available in a space saving 14 pin non-

pullback WSON package.

KEY SPECIFICATIONS

•

LED Drive Current per Channel

42mA (2X Setting)

•

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2

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PRODUCTION DATA information is current as of publication date.

Copyright © 2005–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.