EUP2983 Datasheet | Eutech Microelectronics

White LED Driver For Buck-Boost Application DESCRIPTION The EUP2983 is a constant current boost converter specially designed for driving white LEDs with wide input range. The unique converter topology provide a load voltage which can be greater or less than the input voltage. With the tightly regulated load current, the EUP2983 allows series connection with multiple strings of the white LEDs. The brightness of the LEDs can be adjusted through a voltage level on the CTRL pin or by applying a PWM signal to CTRL pin. 1MHz current-mode, pulse-width modulated (PWM) operation allows for small input and output capacitors and a small inductor while minimizing ripple on the input supply/battery. Programmable soft-start eliminates inrush current during startup. The EUP2983 is available in a space-saving, 8-pin 3mm x 3mm TDFN package. Features z 6V to 25V Input Range z 32V (typ.) Output with Overvoltage Protection z Up to 90% Efficiency z Flexible Analog or PWM Dimming Control z Internal High Power MOSFET Switch z 1MHz PWM Operation z Small, Low-Profile Inductors and Capacitors z 3mm× 3mm TDFN-8 Package z Ro HS pliant and 100% Lead (Pb)-Free APPLICATIONS z 7~10 inch White LED Display Backlighting z 12V Automotive Display System z PDVD and Subnotebooks z LED Lighting Typical Application Circuit DS2983 Ver1.2 Nov. 2008 Figure 1. High Brightness LEDs Application Typical Application Circuit Pin Configurations Package Type Figure 2. WLED Backlight Application Pin Configurations TDFN-8 Pin Description PIN TDFN-8 DESCRIPTION PGND Power Ground IN Input Supply Voltage Brightness Control Input. LED brightness is controlled by the voltage applied to CTRL. CTRL Varying the voltage from 0.24V to 1.68V adjusts the brightness from dim to bright, respectively. Any voltage above 1.68V does not increase brightness. Current-Sense Feedback Input. Connect a resistor from FB to IN to set the LEDs bias current, The voltage (VFB-VIN) regulates...