1FEATURES

2• Audio Synchronized Color LED Driver

• User Defined LED Pattern, Color, and Intensity

Capability

• Programmable:

– LED Drive Current

– PWM Frequency

– High Pass Filter Frequency Select

– Audio Input Signal Gain

• Eliminates External LED Current Limiting

Resistors

• I2C Compatible Interface

• Ultra Low Shutdown Current

APPLICATIONS

• Cell Phones

• Portable MP3, CD, DVD, AAC players

• PDA's

KEY SPECIFICATIONS

• LED Drive Current per Channel (VDD = 5V):

42mA (2X Setting)

• Shutdown Current, VDD = 5V: 1.5μA (Typ)

DESCRIPTION

The LM4970 is a LED driver with an audio

synchronization mode that virtually eliminates the

need for real time software processing for LED

lighting effects. The LM4970 includes three individual

PWM color LED drivers that provide up to 42mA of

current drive for each PWM LED output.

The LM4970 features an audio synchronization mode

where the audio input signal that is mixed in from

three audio inputs is filtered into three frequency

bands, with each frequency band assigned to a

specific PWM LED driver.

The PWM LED drivers can also be directly

programmed through an I2C compatible interface for

applications where user defined LED pattern, color,

and intensity programmability is a priority.

The LM4970 also features an audio input gain control

which allows the user to increase the gain if the audio

input signal does not create a bright enough effect on

the LEDs. The LM4970 is a feature rich LED driver

that is available in a space saving 14 pin nonpullback

WSON package.