DESCRIPTION

The MP1528 is a step-up converter designed for driving up to nine (9) series White LEDs (LED) from a single cell Lithium-Ion battery. It regulates the LED current and includes an analog input for varying the LED brightness.

The MP1528 uses current limited, variable frequency architecture to regulate the LED current while maintaining high efficiency. The BIAS pin measures the output voltage and turns off the converter if an over voltage condition is present to prevent damage due to an open circuit condition. The LED current is measured with an external current sense resistor. The low 0.4V full-scale regulation threshold and 0.63Ω power switch minimize power loss.

The MP1528 is available in an 8 pin MSOP and a tiny 6 pin 3mm x 3mm QFN packages.

FEATURES

• Drives up to 9 Series White LEDs

• Integrated 0.63Ω Power MOSFET

• Low 0.4V Full-Scale Current Sense Threshold

• Over 20mA Output Current Capacity

• Analog and Digital PWM Brightness Control

• Open Load Shutdown

• Soft-Start

• Internal Current Limit

• Under Voltage Lockout

• Thermal Shutdown

• Available in 8-Pin MSOP and Tiny 3mm x 3mm 6-Pin QFN Packages

APPLICATIONS

• Handheld Computers

• PDAs

• PDA Phones

• Digital and Video Cameras

• Small LCD Displays