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L1937 - WHITE LED STEP-UP CONVERTER

Description

The UTC L1937 is a step-up DC/DC converter specifically designed to drive white LEDs with a constant current.

The device can drive two, three or four LEDs in series from a Li-Ion cell.

Features

  • Inherently Matched LED Current.
  • High Efficiency: 84% Typical.
  • Drives Up to Four LEDs from a 3.2V Supply.
  • Drives Up to Six LEDs from a 5V Supply.
  • 36V Rugged Bipolar Switch.
  • Fast 1.2MHz Switching Frequency.
  • Uses Tiny 1mm Tall Inductors.
  • Requires Only 0.22 F Output Capacitor www. DataSheet4U. com SOT-363.
  • Pb-free plating product number: L1937L.

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UTC L1937 WHITE LED STEP-UP CONVERTER LINEAR INTEGRATED CIRCUIT 2 1 DESCRIPTION The UTC L1937 is a step-up DC/DC converter specifically designed to drive white LEDs with a constant current. The device can drive two, three or four LEDs in series from a Li-Ion cell. Series connection of the LEDs provides identical LED currents resulting in uniform brightness and eliminating the need for ballast resistors. The UTC LT1937 switches at 1.2MHz, allowing the use of tiny external components. The output capacitor can be as small as 0.22 F, saving space and cost versus alternative solutions. A low 95mV feedback voltage minimizes power loss in the current setting resistor for better efficiency.
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