產品應用：

LD7291 - WLED Driver with 1~2 Cells Input

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 components to provide the solution for driving maximum 3 WLEDs in a very small PCB size. Furthermore, the 3 WLEDs can achievevery 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

• Very few external components

• Low ripple and low noise

• Low start-up voltage, 0.85V at 1mA

• Direct drive maximum 3 WLEDs

• High efficiency

Applications

• WLED Flashlight

• WLED Torch

• Backlight Module of Hand-held Device

• Constant Current Source

Typical Application