SC440

SC440 High Efficiency Integrated Driver for 6-Strings of 30mA LEDs POWER MANAGEMENT Features Wide input range 4.5V to 21V 36V maximum output voltage with adjustable OVP for smaller output capacitor „ Drives up to 60 WLEDs in 6 strings „ Programmable WLED current for up to 30mA per string „ 1% string-to-string current matching www.DataSheet4U.com „ 2.5A integrated power switch „ Up to 91% efficiency „ 0.2% to 100% PWM dimming „ Analog dimming „ 800KHz switching frequency for small external component „ Open/short LED protection „ Short LED protection disable „ <1uA shut-down current „ Thermal protection „ 4mm x 4mm x1mm MLPQ-24 package (WEEE & RoHS compliant) „ „ Description The SC440 is a high-efficiency multiple string WLED driver with an integrated boost converter. It operates over a wide input range from 4.5V to 21V with a maximum output voltage of 36V and a 2.5A internal power switch. It can drive up to 36V output voltage in 6 strings with current up to 30mA per string. The string-to-string current matching is 1% typical, 3% maximum and the overall efficiency is greater than 90% due to the low current sense voltage and a low-impedance internal power switch. The wide PWM dimming range boasts a ratio of 500: 1. The 800kHz switching frequency enables the user to optimize the external component sizes for high efficiency. When there are fewer LEDs in each string, users can use a lower output voltage protection level which yields an allowable reduction in associated costs, size...