DESCRIPTION

The LX1745 is a compact high efficiency step-up boost regulator for driving white or color LEDs in LCD lighting applications while supplying the necessary LCD bias voltages with an additional two integrated boost converters.

Designed for maximum efficiency and featuring a psuedo-hysteretic PFM topology (that decreases output voltage ripple), the LX1745 minimizes system cost and condenses layout area making it ideal for PDA, smart-phone, and digital camera applications.

KEY FEATURES

◾ > 90 Maximum Efficiency

◾ Low Quiescent Supply Current

◾ Externally Programmable Peak Inductor Current Limit For Maximum Efficiency

◾ Logic Controlled Shutdown

◾ < 1µA Shutdown Current

◾ Dynamic Output LED Current and Two LCD Bias Voltage Adjustments Via Analog Reference Or Direct PWM Input

◾ 20-Pin TSSOP Package

APPLICATIONS

◾ Pagers

◾ Smart Phones

◾ PDAs

◾ Handheld Computers

◾ General LCD Bias Applications

◾ LED Driver