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SC4509 Datasheet(PDF) 1 Page - Semtech Corporation |
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SC4509 Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 15 page  POWER MANAGEMENT www.semtech.com Highly Integrated Step-Up Converter for White LED Applications in MLPD-W8-2x2 SC4509 POWER MANAGEMENT 1 Description Features Applications Typical Application Circuit March 26, 2007 L1 22μH R1 LED3 U2 SC4509 VIN 5 EN/SS 4 FB 3 Vin LED4 LED2 Vo C2 0.22μF C1 1μF EN/SS LED1 Digital Video Cameras White LED Backlight Driver OLED Display Driver Portable Media Players GPS Receivers Cellular Phones PDAs and Handheld Computers VIN range: 2.7V — 10V Integrated Schottky diode 81% efficiency Requires only 4 external components Up to 20V of output voltage 30mA maximum LED current Open LED protection (OVP) 1.2MHz PWM switching frequency Low feedback voltage (20OmV typical) Wide range of PWM dimming Drives up to 5 LEDs 500mA switch current limit 220nF output capacitor Available in 2mm x 2mm x 0.75mm MLPD-W8 and SOT23-6 packages Packages are fully WEEE and RoHS compliant The SC4509 is a highly integrated step-up DC/DC convert- er targeted for white LED backlighting applications. It is designed to drive up to five LEDs with a wide input voltage range of 2.7 to 10 volts. Designed for 20V output voltage, the SC4509 operates with a constant 1.2MHz PWM fre- quency. To optimize efficiency, the feedback voltage is set to only 199mV, minimizing the power loss in the current setting resistor. The product requires only four external components (CIN, COUT, L and R SET), making it ideal for applications that require low cost and minimal PCB area. The SC4509 offers current limit and over-voltage protec- tion (OVP) to safeguard the device under extreme operat- ing conditions. If the LEDs become disconnected or fail in an open state condition, OVP circuitry will be activated to shut down the device. The EN/SS pin allows the device to be placed in power-down mode, disabling the control circuitry to reduce input current. |
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