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
