Texas Instruments LM3532
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.| Part No. | LM3532 |
|---|---|
| Datasheet | LM3532 Download |
| Manufacturer |  Texas Instruments |
| Description | High-Efficiency White LED Driver |
| Buy | Stock & Price |
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 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 2
APPLICATIONS
● Power Source for White LED Backlit LCD Displays● Programmable Keypad Backlight 3
DESCRIPTION
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.
