LM3532 Series
High efficiency white LED driver with programmable Ambient Light Sensing Capability and I2C Compati
Manufacturer: Texas Instruments
Catalog
High efficiency white LED driver with programmable Ambient Light Sensing Capability and I2C Compati
Key Features
• Drives up to 3 Parallel High-Voltage LED Stringsat 40 V Each With up to 90% Efficiency0.4% Typical Current Matching Between Strings256 Level Logarithmic and Linear BrightnessControl With 14-Bit Equivalent DimmingI2C-Compatible InterfaceDirect Read Back of Ambient Light Sensor Via8-bit ADCProgrammable Dual Ambient Light Sensor InputsWith Internal Sensor Gain SelectionDual External PWM Inputs for LED BrightnessAdjustmentIndependent Current String Brightness ControlProgrammable LED Current Ramp Rates40-V Overvoltage Protection1-A Typical Current LimitDrives up to 3 Parallel High-Voltage LED Stringsat 40 V Each With up to 90% Efficiency0.4% Typical Current Matching Between Strings256 Level Logarithmic and Linear BrightnessControl With 14-Bit Equivalent DimmingI2C-Compatible InterfaceDirect Read Back of Ambient Light Sensor Via8-bit ADCProgrammable Dual Ambient Light Sensor InputsWith Internal Sensor Gain SelectionDual External PWM Inputs for LED BrightnessAdjustmentIndependent Current String Brightness ControlProgrammable LED Current Ramp Rates40-V Overvoltage Protection1-A Typical Current Limit
Description
AI
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.
The main features of the LM3532 include dual ambient light sensor inputs each with 32 internal voltage setting resistors, 8-bit logarithmic and linear brightness control, dual external PWM brightness control inputs, and up to 1000:1 dimming ratio with programmable fade in and fade out settings.
The LM3532 is available in a 16-pin, 0.4-mm pitch thin DSBGA package. The device operates over a 2.7-V to 5.5-V input voltage range and the −40°C to +85°C temperature range.
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.
The main features of the LM3532 include dual ambient light sensor inputs each with 32 internal voltage setting resistors, 8-bit logarithmic and linear brightness control, dual external PWM brightness control inputs, and up to 1000:1 dimming ratio with programmable fade in and fade out settings.
The LM3532 is available in a 16-pin, 0.4-mm pitch thin DSBGA package. The device operates over a 2.7-V to 5.5-V input voltage range and the −40°C to +85°C temperature range.
