LM3532 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-patible 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.
LM3532 Key Features
- 1 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
- I2C-patible Interface
- Direct Read Back of Ambient Light Sensor Via
- Programmable Dual Ambient Light Sensor Inputs
- Dual External PWM Inputs for LED Brightness
- Independent Current String Brightness Control
- Programmable LED Current Ramp Rates
- 40-V Overvoltage Protection
LM3532 Applications
- Power Source for White LED Backlit LCD Displays