DESCRIPTION

The EV0022 evaluation board uses the MP1522 to drive up to six (6) series white LEDs from a single cell Lithium Ion battery. The MP1522 uses a current limited, variable frequency architecture to regulate the LED current, which is measured through an external current sense resistor. Its 1.23V, 3 feedback threshold improves the LED current regulation. The BIAS pin can measure the output voltage and turn off the converter to prevent damage in an open circuit condition.

FEATURES

• Internal 0.5Ω Power Switch

• Output Voltage up to 25V

• Up to 90 Efficiency

• Low 1µA Shutdown Current

• Input Under-Voltage Protection

• Thermal Shutdown

• Internal Current Limit

APPLICATIONS

• Handheld Computers, PDAs

• Cell Phones

• Digital Still and Video Cameras

• Small LCD Displays