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LM3520 Datasheet

  • LM3520

  • Integrated White LED Driver with Organic LED Display Power S...

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  • 14頁

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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 dis-
play is enabled, the device is operating in PWM mode.
Overvoltage protection circuitry and a 1MHz switching fre-
quency allow for the use of small, low cost external compo-
nents.
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.
Features
n
Integrated OLED and white-LED driver
n
80% efficiency
n
Drives up 5 LEDs at 20mA/3.6V and 4 LEDs at
30mA/3.6V for main-display
n
Up to 20V
@
50mA/3.6V for sub-display
n
True shutdown isolation
n
Small External Components
n
1 MHz Switching Frequency
n
23V OverVoltage Protection
n
Wide Input Voltage Range: 2.7V to 5.5V
n
Cycle-By-Cycle Current Limit
n
PWM Dimming Control
n
Low Profile 14-Pin LLP(3mm x 4mm x 0.8mm)
Applications
n
n
n
n
n
Flip-phones/Clam-shell Cellular Phones
Handheld Devices
High-fashion cellular phones
White LED Backlighting
Digital Cameras
Typical Applications
20128803
Main Display with OLED Sub Display
漏 2005 National Semiconductor Corporation
DS201288
www.national.com

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