DESCRIPTION

The ZXLD1100 is a PFM inductive boost converter designed for driving 2, 3 or 4 series connected white LEDs from a Li-Ion cell and up to 8 LEDs from a 5V supply. The device operates from an input supply of between 2.5V and 5.5V and provides an adjustable output current of up to 50mA.

The ZXLD1100 includes the output switch and peak current sense resistor, and can operate with a maximum output voltage of 28V.

ADVANCED FEATURES

• Internal 30V NDMOS switch, current sense and open circuit protection

• True Analog Dimming via PWM

FEATURES

• Low profile SC70 6 pin package

• Internal PWM filter for flicker free output

• High efficiency (80 typ)

• Wide input voltage range: 2.5V to 5.5V

• Up to 50mA output current

• Low quiescent current: (60μA typ)

• 500nA maximum shutdown current

• Up to 1MHz switching frequency

• Low external component count

• Inherently matched LED currents

APPLICATIONS

• Mobile phones

• Digital cameras

• PDAs

• LCD modules

• Portable internet appliances

• Palmtop computers