Integrated White LED Driver With Organic LED Display Power Supply

The LM3520 is a dual Step-up DC/DC converter, designed to drive up to 5 white LEDs with a constant current and to power an organic LED Display with a constant voltage.
A single external resistor is used to set the maximum LED current. The LED current CAN be adjusted by applying a PWM signal to the EN pin. For higher efficiency the LM3520 operates with pulse frequency modulation (PFM) control scheme when the sub-display is enabled. When Main Display is enabled, the device is operating in PWM mode.
Overvoltage protection circuitry and a 1MHz switching frequency allow for the use of small, low cost external components.
Additional features include a low-side NFET Switch that CAN turn off the LED string with no DC current path to ground.
The LM3520 is available in a small 14-pin thermally-enchanced LLP package.
By National Semiconductor Corporation
LM3520 's PackagesLM3520 's pdf datasheet

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LM3520 Application circuits
LM3520 circuits
This is one application circuit of LM3520,If you need more circuits,please download LM3520's pdf datasheet.

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