LX1742

www.DataSheet4U.com LX1742 I N T E G R A T E D P R O D U C T S High Efficiency High Voltage Boost Controller P RODUCTION D ATA S HEET DESCRIPTION KEY FEATURES WWW . Microsemi . C OM 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. The input voltage ranges from 1.6V to 6.0V, allowing for a wide selection of system battery voltages. Start-up operation is guaranteed at 1.6V input The LX1742 is capable of achieving output voltages as high as 25V and the output voltage is easily programmed using two external resistors in conjunction with the feedback pin. The LX1742 has an additional feature for simple dynamic adjustment of the output voltage (i.e., up to ±15% of the nominal output voltage). Voltage adjustment is achieved via an analog reference signal or a direct PWM input signal applied to the ADJ pin. Any PWM amplitude is easily accommodated with a single external resistor. ƒ 80% Typical Efficienc...