The AME5142/5142A is a Boost DC/DC converter specificallydesigned to drive white LEDs with a constantcurrent. The device can drive 1 to 6 LEDs in series ormultiple strings from a Li-lon cell. Series connection ofthe LEDs provides identical LED currents resulting in uniformbrightness and eliminating the need for ballast resistors.The AME5142/5142A switches at 1.2MHz, allowingthe use of tiny external components. The inputand output capacitor can be as small as 1mF(or 4.7mF),saving space and cost versus alternative solutions. A lowfeedback voltage minimizes power loss in the currentsetting resistor for better efficiency. The AME5142/5142Ais available in SOT-26/TSOT-26 & SOT-25/TSOT-25 packages. The only difference between AME5142 and AME5142Ais feedback trip point. The AME5142 is 0.15V andAME5142A is 0.104V.
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