POWER POWERMANAGEMENT MANAGEMENT Description
SC4509 Highly Integrated Step-Up Converter for White LED Applications in M...
POWER POWERMANAGEMENT MANAGEMENT Description
SC4509 Highly Integrated Step-Up Converter for White LED Applications in MLPD-W8-2x2
Features
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 converter 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 frequency. 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 RSET), making it ideal for www.DataSheet4U.com applications that require low cost and minimal PCB area. The SC4509 offers current limit and over-voltage protection (OVP) to safeguard the device under extreme operating 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 ...
