LP3952 Datasheet, PDF (1/44 Pages) National Semiconductor (TI) – 6-Channel Color LED Driver with Audio Synchronization

July 2007
LP3952
6-Channel Color LED Driver with Audio Synchronization
General Description
LP3952 is a color LED driver for battery powered handheld
devices. It drives any color LEDs including RGB LEDs, indi-
cator LEDs and keypad backlight LEDs. The boost DC-DC
converter drives high current loads with high efficiency. The
stand-alone command based RGB controller is feature rich
and easy to configure. Different lighting patterns and blinking
sequences can be programmed to driver registers. Built-in
audio synchronization feature allows user to synchronize the
color LEDs to audio signal. LED lighting can be controlled ei-
ther by audio signal amplitude or frequency. There are many
controls available for audio synchronization to get desired
lighting effect, including gain, speed, and different filter set-
tings. The flexible I²C interface allows easy control of LP3952.
LED outputs can be also controlled with external PWM signal.
Small micro SMDxt package together with minimum number
of external components is a best fit for handheld devices.
Features
■ ^{Constant current and PWM controlled color LED drivers}
■ ^{Maximum current 40mA / output in constant current mode,}
supports also switch mode control with 50 mA maximum
current / output
■ ^{Complete audio synchronization for color/RGB LEDs with}
amplitude, frequency and speed optimization
■ ^{Command based lighting pattern generator for RGB LEDs}
■ ^{Programmable ON/OFF blinking sequences for RGB1}
outputs
■ ^{High efficiency Boost DC-DC converter with}
programmable V_OUTand f_SW
■ ^{I2C compatible interface}
■ ^{Possibility for external PWM dimming control}
■ ^{Small package – 36-bump micro SMDxt, 3.0 x 3.0 x 0.65}
mm
Applications
■ ^{Cellular Phones}
■ ^{PDAs, MP3 players}
Typical Applications
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