UTC L1937
WHITE LED STEP-UP CONVERTER
LINEAR INTEGRATED CIRCUIT
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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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