LD7291 Datasheet | Leadtrend

WLED Driver with 1~2 Cells Input 5/31/2007 REV: 00a General Description The LD7291 is a high efficiency WLED driver to drive maximum 3 WLEDs from single or 2 battery cells. By using the proprietary topology, the LD7291 can operate under as low as 0.85V to fully utilize the energy of battery. The LD7291 only needs 4 external passive ponents to provide the solution for driving maximum 3 WLEDs in a very small PCB size. Furthermore, the 3 WLEDs can achieve very good current matching without any extra current /brightness control circuit. All the above functions are integrated in a tiny SOT-26 package. The LD7291 is the ideal solution for battery-powered LED driving applications. Features z Very few external ponents z Low ripple and low noise z Low start-up voltage, 0.85V at 1m A z Direct drive maximum 3 WLEDs z High efficiency Applications z WLED Flashlight z WLED Torch z Backlight Module of Hand-held Device z Constant Current Source g Patent pending Typical Application 1~2 cell LX Vout LED1 LED2 LED3 Leadtrend Technology Corporation LD7291-DS-00a May 2007 Pin Configuration SOT-26 (TOP VIEW) LED3 LED2 LED1 Y WP 91 12 4 3 Y : Year code W : Week code P : LD72.. (Product family code) LX VOUT GND Y The PB free package is identified in embossed font Ordering Information Part number LD7291 PL Package SOT-26 The LD7291PL is ROHS pliant. Pin Descriptions PIN NAME 1 LX 2 VOUT 3 GND 4 LED1 5 LED2 6 LED3 Switching Pin Output voltage Ground LED connection pin LED connection pin LED connection pin Top Mark YWP/91 FUNCTION Shipping 3000 /tape & reel Leadtrend Technology Corporation LD7291-DS-00a May...