DESCRIPTION

The LX1742 is a compact high efficiency step-up boost controller. Featuring a pseudo-hysteretic pulse frequency modulation topology, the LX1742 was designed for maximum efficiency, reduced board size, and minimal cost.

Utilizing an internal N-Channel MOSFET, the LX1742 offers designers maximum flexibility with respect to efficiency and cost. The LX1742 provides several design enhancements that improve overall performance under very light load currents by implementing control circuitry that is optimized for portable systems - thus providing a quiescent supply current of only 80µA (typ) and a shutdown current of less than 1µA.

KEY FEATURES

◾ 80 Typical Efficiency

◾ 80µA Typical Quiescent Supply Current

◾ Externally Programmable Peak Inductor Current Limit For Maximum Efficiency

◾ Logic Controlled Shutdown

◾ < 1.0 µA Shutdown Current (typ)

◾ Dynamic Output Voltage Adjustment Via Analog Reference Or Direct PWM Input

◾ 8-Pin MSOP Package

APPLICATIONS/BENEFITS

◾ Pagers

◾ Wireless Phones

◾ PDAs

◾ Handheld Computers

◾ General LCD Bias Applications

◾ LED Driver