NJU6048

NJU6048 www.DataSheet4U.com PRELIMINARY High Efficiency White LED Driver ! GENERAL DESCRIPTION The NJU6048 is a high-efficiency white LED driver. It contains a high-efficiency step-up DC/DC converter and an output driver. The IC can output max.18V and drive as many as 4 white LEDs in series with a constant current, which guarantees the LEDs with uniform brightness. The high frequency of the step-up converter permits the use of small, low-profile inductors and capacitors to minimize the footprint in space-conscious applications. The NJU6048 also features low operating voltage of 1.7V and the small package SOT-23 (MTP-5). All of these benefits make the NJU6048 suitable for the battery-powered portable applications such as cellular phones, camcorders, PDAs, etc. ! PACKAGE OUTLINE NJU6048F ! FEATURES # Drives Up to 4White LEDs in Series IOUT = 20mA(typical) # Uses Small Inductor and Capacitors # 1.7V to 6.5V Operating Voltage for Step-up Circuits (VDD) # Low Switch RDS (ON) VSW = 18V, RDS=0.8Ω (ISW=150mA) # OVP Function # CMOS Technology # Package : SOT-23 5 pin (MTP-5) ! PIN CONFIGURATION (TOP VIEW) SW VSS FB 1 2 3 5 VDD 4 OVP Ver.2005-06-09 -1- NJU6048 www.DataSheet4U.com ! PIN DESCRIPTIONS No. 1 2 3 4 5 SYMBOL SW VSS FB OVP VDD TYPE Input Power Input Input Power Switch Terminal Ground Terminal Feedback Terminal Over Voltage protection Terminal Power Supply terminal DESCRIPTION ! BLOCK DIAGRAM L1 VIN C1 OVP Bias DC/DC Control + VREF = 0.25V VSS FB VDD SW D1 O...