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
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