LY3109A

This IC is a dual-output multifunctional LED driver control chip integrating lithium battery charge management, LED function control, and protection modules, with a shutdown standby current of only 3uA. It features dual-output control with a maximum output current of 1A per channel, offering two lighting function cycle modes configurable via the FUN pin (floating or grounded). When FUN is floating, the cycle mode is: 100% - 25% - Strobe - CH2 - Off; when FUN is grounded, the cycle mode is: 100% - Strobe - CH2 - Off.

Applications

• Dual-output flashlight
• Emergency light

Key features

• Dual output, max 1A drive current per channel
• FUN=H: 100% - 25% - Strobe - CH2 - Off; FUN=L: 100% - Strobe - CH2 - Off
• 0.5A charging current
• Single-LED and dual-LED status indication
• Red during charging, switches to green when fully charged
• Green during discharge, green flashing at low battery
• Preset 4.2V full-charge voltage
• 2.6V over-discharge protection
• Over-current protection, short-circuit protection, thermal protection
• SOP8 package