|Package | PIN:||YFQ | 16|
|Temp:||Q (-40 to 125)|
- 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
- Programmable Dual Ambient Light Sensor Inputs
With Internal Sensor Gain Selection
- Dual External PWM Inputs for LED Brightness
- Independent Current String Brightness Control
- Programmable LED Current Ramp Rates
- 40-V Overvoltage Protection
- 1-A Typical Current Limit
Texas Instruments LM3532TME-40A/NOPB
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.