LP3950

100 nF

100 nF

100 nF

2.8V

10 PF

4.7 PH

10 PF

82k

100 nF

SW

FB

R1

G1

B1

R2

G2

B2

RT

VREF

GNDs

AUDIO SIGNAL

10 nF

AUDIO SIGNAL

SINGLE-ENDED

DIFFERENTIAL

10 nF

10 nF

MICROCONTROLLER

4

SERIAL

INTERFACE

NRST

PWM_LED

100 nF

IF_SEL

DME

AMODE

ASE

AD1

AD2

LP3950

www.ti.com

SNVS331C – NOVEMBER 2004 – REVISED APRIL 2013

LP3950 Color LED Driver with Audio Synchronizer

Check for Samples: LP3950

1

FEATURES

DESCRIPTION

The LP3950 is a color LED driver with a built-in audio

2

•

Audio Synchronization for Color LEDs with

synchronization feature for any analog audio input

Two Modes: Amplitude and Frequency

such as polyphonic ring tones and MP3 music. LEDs

•

Programmable Frequency and Amplitude

can be synchronized to an audio signal with two

Response with Tracking Speed Control

methods - amplitude and frequency. Also several fine

tuning

options

are

available

for

differentiation

•

Automatic Gain Control or Selectable Gain for

purposes. The chip also has an unique AGC

Input Signal Optimization

(Automatic Gain Control) feature which tracks the

•

RGB Pattern Generator Similar to

input signal level and automatically adjusts the gain

LP3933/LP3936

to an optimal value.

•

Magnetic DC-DC Boost Converter with

The LP3950 has a high efficiency magnetic DC/DC

Programmable Boost Output Voltage

converter with programmable output voltage and

•

switching frequency. The converter has high output

current capability so it is also able to drive flash LEDs

•

One Pin Default Enable for Non-Serial Interface

in camera phone applications.

Users. One Pin Selector for Synchronization

Mode

The LP3950 is similar to LP3933 and LP3936 in that

•

Space Efficient 32-Pin TLGA Package

the color LEDs (or RGB LEDs) can also be

programmed

to

generate

light

patterns

(programmable color, intensity, on/off timing, slope

APPLICATIONS

and blinking cycle).

•

Cellular Phones

All functions are software controllable through a SPI

•

MP3/CD/Minidisc Players

•

Toys

supports one pin control for enabling predefined

(default) audio synchronization mode.

Typical Application

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2004–2013, 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.