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
• 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 (Typ) (uA)
• 1
• Operating temperature range (C)
• -40 to 85
• Rating
• Catalog

LP3950的完整型号有：LP3950SL/NOPB，以下是这些产品的关键参数及官网采购报价：

LP3950SL/NOPB，工作温度：-40 to 85，封装：TLGA (NPC)-32，包装数量MPQ：1000个，MSL 等级/回流焊峰值温度：Level-3-260C-168 HR，引脚镀层/焊球材料：NIAU，TI官网LP3950SL/NOPB的批量USD价格：1.785（1000+）

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