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LM3520SD Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM3520SD Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 14 page  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 to 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 Flip-phones/Clam-shell Cellular Phones n Handheld Devices n High-fashion cellular phones n White LED Backlighting n Digital Cameras Typical Applications 20128803 Main Display with OLED Sub Display September 2005 © 2005 National Semiconductor Corporation DS201288 www.national.com |
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