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LM3532TME-40A Datasheet

Part NameDescriptionManufacturer
LM3532TME-40A High-Efficiency White LED Driver With Programmable Ambient Light Sensing Capability and I2C-Compatible Interface Texas-Instruments
Texas Instruments Texas-Instruments
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Description
The LM3532 is a 500-kHz fixed frequency asynchronous boost converter which provides the power for 3 high-voltage, low-side current sinks. The device is programmable over an I2C-compatible interface and has independent current control for all three channels. The adaptive current regulation method allows for different LED currents in each current sink thus allowing for a wide variety of backlight and keypad applications.

Features
• Drives up to 3 Parallel High-Voltage LED Strings at 40 V Each With up to 90% Efficiency
• 0.4% Typical Current Matching Between Strings
• 256 Level Logarithmic and Linear Brightness Control With 14-Bit Equivalent Dimming
• I2C-Compatible Interface
• Direct Read Back of Ambient Light Sensor Via 8-bit ADC
• Programmable Dual Ambient Light Sensor Inputs With Internal Sensor Gain Selection
• Dual External PWM Inputs for LED Brightness Adjustment
• Independent Current String Brightness Control
• Programmable LED Current Ramp Rates
• 40-V Overvoltage Protection
• 1-A Typical Current Limit

Applications
• Power Source for White LED Backlit LCD Displays
• Programmable Keypad Backlight

 

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