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LP3950SL
2.7 V to 2.9 V, color LED driver with audio synchronizer
LP3950
Color LED Driver with Audio Synchronizer
General DescriptionThe LP3950isa color LED driver with builtin audio synchro-
nization featurefor any analog audio input suchas poly-
phonic ring tones and MP3 music. The LEDs canbe syn-
chronizedtoan audio signal with two methods: Amplitude
and Frequency. Also several fine tuning options are available
for usersfor differentiation purposes. The chip also hasan
unique AGC (Automatic Gain Control) feature which tracks
the input signal level and automatically adjusts the gainto
optimal value.
The LP3950 hasa high efficiency magnetic DC/DC con-
verter with programmable output voltage and switching fre-
quency.The converter has high output current capabilitysoit also ableto drive flash LEDsin camera phone applica-
tions.
The LP3950is similarto LP3933 and LP3936in that the
color LEDs (or RGB LEDs) can alsobe programmedto
generate light patterns (programmable color, intensity, on/off
timing, slope and blinking cycle).
All functions are software controllable througha SPIorI2C
compatible interface but the device also supports one pin
controlfor enabling predefined (default) audio synchroniza-
tion mode.
Features Audio synchronizationfor color LEDs with two modes:
Amplitude and Frequency. Programmable frequency and amplitude response with
tracking speed control. Automatic gain controlor selectable gainfor input signal
optimization. Pattern generator similarto LP3933/LP3936 Low noise magnetic DC-DC boost converter with
programmable VOUT. Selectable SPIorI2C compatible interface Onepin default enablefor non-serial interface users.
Onepin selectorfor synchronization mode. Space efficient 32-pin thin CSP laminate package
Applications Cellular phones, MP3/CD/minidisc players, toys.
Typical ApplicationPRELIMINARY
November 2004
LP3950
Color
LED
Driver
with
Audio
Synchronizer
