LM3530UMX-40

• Drives up to 11 LEDs in series
• 1000:1 dimming ratio
• 90% efficiency
• Programmable dual-illumination internal ALS voltage setting resistance sensor input
• I 2 C Programmable logarithmic or linear brightness control
• External PWM input for simple brightness adjustment
• True shutdown isolation and ambient light sensors for LEDs
• Internal soft start limits inrush current
• Wide input voltage range of 2.7V to 5.5V
• 40V and 25V overvoltage protection options
• Operates at a fixed frequency of 500kHz
• 839 mAh peak current limit
• Low-profile 12-bump micro SMD package

illustrate

The LM3530 current-mode boost converter provides power and controls the current of up to 11 series of white LEDs. The 839 mA current limit and input voltage range of 2.7V to 5.5V make the device ideal for portable applications with a versatile backlit power supply.

LED current can pass through I from 0 to 29.5 mA 2 C compatible interface. The current 127 different steps and 8 different maximum LED current levels give 1000 programmable LEDs the current level. In addition, PWM brightness control can be entered via external logic levels.

The device also has two ambient light sensor inputs. These are designed to monitor the analog output ambient light sensor and provide programmable adjustment of the LED current to the change in ambient light. Each ambient light sensor input has an independently programmable internal voltage setting that can be made with high impedance to reduce downtime power resistance. The LM3530's 500kHz switching frequency allows for high conversion efficiency over a wide range of output voltages from 2 to 11 series of LEDs. Finally, adjusting the backlight content supports maximizing battery life while maintaining the quality of the displayed image.

The LM3530 is a tiny 12-bump available (1.6 mm×1.2 mm×0.425 mm) micro SMD package that operates over a temperature range of -40°C to +85°C.

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• Smartphone LCD backlight
• Personal navigation LCD backlight
• 2 to 11 series white LED backlit display power supply