The LM3530 current mode boost converter supplies the power and controls the current in up
to 11 series white LEDs. The 839-mA current limit and 2.7-V to 5.5-V input voltage range make the
device a versatile backlight power source ideal for operation in portable applications.
The LED current is adjustable from 0 mA to 29.5 mA via an
I2C-compatible interface. The 127 different current steps and 8
different maximum LED current levels give over 1000 programmable LED current levels. Additionally,
PWM brightness control is possible through an external logic level input.
The device also features two Ambient Light Sensor inputs. These are designed to monitor
analog output ambient light sensors and provide programmable adjustment of the LED current with
changes in ambient light. Each ambient light sensor input has independently programmable internal
voltage setting resistors which can be made high impedance to reduce power during shutdown. The
500-kHz switching frequency allows for high converter efficiency over a wide output voltage range
accommodating from 2 to 11 series LEDs. Finally, the support of Content Adjusted Backlighting
maximizes battery life while maintaining display image quality.
The LM3530 operates over the −40°C to 85°C temperature range.
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