LT3466

peculiarity

• Up to 20 white LEDs can be driven from a single 3.6V supply (10 LEDs in series per converter)
• Two independent boost converters capable of driving asymmetrical LED strings
• Separate dimming and shutdown controls are available for the two LED strings
• Internal Schottky diode
• Internal soft-start circuitry eliminates inrush current
• LED open circuit protection (V_OUTThe maximum value is 42V)
• Fixed frequency operation up to 2MHz is possible
• 81% efficiency when driving 16 white LEDs from a 3.6V supply and 15mA (8 LEDs per driver)
• Wide input voltage range: 2.7V to 24V
• Slim (3mm x 3mm) 10-pin DFN package

• description

  LT^®The 3466 is a dual-output, full-featured step-up DC/DC converter designed to drive up to 20 white LEDs (10 series LEDs per converter) with a constant current. Using LEDs in series provides equal LED current, resulting in uniform display brightness and eliminating the need for ballast resistors and costly factory calibration.

  Two independent converters are capable of driving asymmetrical LED strings. The dimming operation of the two LED strings can also be controlled independently. The LT3466 is ideal for backlighting used in primary and secondary displays in cellular phones and other handheld devices.

  An external resistor can be used to set the LT3466 operating frequency from 200kHz to 2MHz. The low feedback voltage of 200mV minimizes the power dissipation of the current setting resistor, improving efficiency. Other features include output voltage limiting when the LED is disconnected and internal soft-start.

  The LT3466 is available in a low profile DFN package with a small footprint (3mm x 3mm x 0.75mm).

• apply

  • Primary/secondary display
  • Digital cameras, auxiliary notebook PCs
  • PDA, handheld computer
  • Car