LM3532TMX-40A/NOPB Datasheet PDF - TI

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