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DESCRIPTION

The MP1523 is a 5-pin SOT23 step-up converter designed for driving up to six (6) series white LEDs from a single-cell Lithium Ion battery. The MP1523 uses a current limited, variable frequency architecture to regulate the LED current, which is measured through an external current sense resistor. Its low 0.4V feedback threshold reduces power loss and improves efficiency. To prevent damage due to an open circuit condition, the BIAS pin can measure the output voltage and turn off the converter if an over-voltage condition is present.

The MP1523 includes under-voltage lockout, current limiting, and thermal overload protection to prevent damage in the event of an output overload. The MP1523 is available in a small 5-pin SOT23 package.

FEATURES

• On Board Power MOSFET

• Drives up to 6 White LEDs

• Up to 90 Efficiency

• Over 80mA Output Current Capacity

• Open Load Shutdown

• Low 0.4V Feedback Threshold

• UVLO, Thermal Shutdown

• Soft-Start

• Internal Current Limiter

• Available in SOT23-5 Package

• Evaluation Board Available

APPLICATIONS

• Cell Phones

• Handheld Computers and PDAs

• Digital Still and Video Cameras

• Small LCD Displays