LTC3490EDD#PBF

LTC3490 provides a constant current drive for 1W LED applications. It is a high efficiency boost converter that operates from 1 or 2 NiMH or alkaline cells and generates 350mA of constant current with up to 4V of compliance. It contains a 100mohm NFET switch and a 130mohm PFET synchronous rectifier. The fixed switching frequency is internally set to 1.3MHz. The LTC3490 limits the output voltage to 4.7V if the output load is disconnected. It also features an analogue dimming capability that reduces the drive current proportional to the CTRL/SHDN pin voltage. A low-battery logic output signals when the battery has dropped below 1V/cell. An undervoltage lockout circuit shuts down the LTC3490 when the battery voltage drops below 0.85V/cell. The feedback loop is internally compensated to minimize component count. Applications includes portable lighting and rechargeable flashlights.

• 1- or 2-cell NiMH or alkaline input
• Synchronous rectification up to 90% efficiency
• 1.3MHz fixed frequency operation, low quiescent current of <lt/>1mA
• Very low shutdown current of <lt/>50µA
• Open LED output limited to 4.7V
• VIN range from 1V to 3.2V, dimming control
• Undervoltage lockout to protect batteries
• Input supply range from 1V to 3.2V
• Typical switching frequency of 1.3 MHz
• 8 lead plastic DFN package, operating temperature range from -40°C to 85°C

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