LX1734

www.DataSheet4U.com TM ® LX1734 1.0MHz Inverting DC/DC Converter KEY FEATURES ƒ Fixed Frequency 1.0MHz Operation ƒ Very Low Noise: 1mVP-P Output Ripple Possible With Cuk Topology ƒ Stable Operation With Ceramic or Tantalum Capacitors ƒ -5V at 250mA from 5V Input ƒ Uses Small Surface Mount L/C Components ƒ Wide Input Range: 4.2V to 8V ƒ Low VCESAT Switch: 600mV at 600mA ƒ 6-Lead 3x3mm JEDEC MLPM Package ƒ Functionally Compatible with LT1611 or LT1931 APPLICATIONS/BENEFITS ƒ ƒ ƒ ƒ ƒ Disk Drive MR Head Bias Digital Camera CCD Bias LCD Bias GaAs FET Bias Local -5V or -12V Supplies DESCRIPTION The LX1734 is an inverting DC/DC current-mode controller. With a 750mA integrated switch, the LX1734 can generate large output currents in a small footprint. The LX1734 minimizes external component size and cost by implementing a high switching frequency of 1.0MHz, while generating -5V at 250mA. When configured in the dual inductor inverting topology very low output voltage ripple approaching 1mVP-P can be achieved when used in conjunction with ceramic output capacitors. The dual inductor can be implemented as a coupled or separate cores. Fixed frequency operation ensures a clean output free from low frequency noise typically present with charge pump solutions. The low impedance output remains within 1% of nominal during large load steps. The 18V switch allows high voltage outputs to be generated. The LX1734 is available in the space saving 6-lead 3x3 Jedec MO-229 package, which has the...