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LM3500 Key Features

  • 2 Synchronous Rectification, High Efficiency and no External Schottky Diode Required
  • Uses Small Surface Mount ponents
  • Can Drive 2-5 White LEDs in Series
  • (May Function With More Low-VF LEDs)
  • 2.7V to 7V Input Range
  • Internal Output Over-Voltage Protection (OVP)
  • LM3500-16: 15.5V OVP; LM3500-21: 20.5V
  • True Shutdown Isolation
  • Input Undervoltage Lockout
  • Requires Only Small Ceramic Capacitors at the

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LM3500 Description

The LM3500 is a fixed-frequency step-up DC/DC converter that is ideal for driving white LEDs for display backlighting and other lighting functions. With fully intergrated synchronous switching (no external schottky diode required) and a low feedback voltage (500mV), power efficiency of the LM3500 circuit has been optimized for lighting applications in wireless phones and other portable products (single cell Li-Ion...