LP3950 Texas instruments

LP3950

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LP3950

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Описание

The LP3950 is a color LED driver with a built-in audio synchronization feature for any analog audio input such as polyphonic ring tones and MP3 music. LEDs can be synchronized to an audio signal with two methods - amplitude and frequency. Also several fine tuning options are available for differentiation purposes. The chip also has an unique AGC (Automatic Gain Control) feature which tracks the input signal level and automatically adjusts the gain to an optimal value. The LP3950 has a high efficiency magnetic DC/DC converter with programmable output voltage and switching frequency. The converter has high output current capability so it is also able to drive flash LEDs in camera phone applications. The LP3950 is similar to LP3933 and LP3936 in that the color LEDs (or RGB LEDs) can also be programmed to generate light patterns (programmable color, intensity, on/off timing, slope and blinking cycle). All functions are software controllable through a SPI or I2C compatible interface but the device also supports one pin control for enabling predefined (default) audio synchronization mode.

Audio Synchronization for Color LEDs with Two Modes: Amplitude and Frequency
Programmable Frequency and Amplitude Response with Tracking Speed Control
Automatic Gain Control or Selectable Gain for Input Signal Optimization
RGB Pattern Generator Similar to LP3933/LP3936
Magnetic DC-DC Boost Converter with Programmable Boost Output Voltage
Selectable SPI or I²C Compatible Interface
One Pin Default Enable for Non-Serial Interface Users. One Pin Selector for Synchronization Mode
Space Efficient 32-Pin TLGA Package

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Number of channels	6
LED current per channel (mA)	25
LED configuration	Parallel
Program memory	Yes
Topology	Boost
Programmable ramp control	Yes
Vin (min) (V)	3
Vin (max) (V)	7.2
Iout (max) (A)	0.15
Features	I2C control
Iq (typ) (mA)	0.85
Shutdown current (ISD) (typ) (µA)	1
Operating temperature range (°C)	-40 to 85
Rating	Catalog