LM3520 Integrated White LED Driver with Organic LED Display Power Supply
PRELIMINARY
February 2005
LM3520 Integrated White LED Driver with Organic LED Display Power Supply
General Description
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.
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