描述 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 com-ponent 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 same footprint and lead spacing as the SOT-23A. A complete inverter function utilizes less than 0.32 inches of PCB space.Key FeaturesFixed Frequency 1.0MHz Operation?Very Low Noise: 1mVP-P Output Ripple Possible With Cuk Topology?Stable Operation With Ceramic or Tantalum Capacitors?-5V at 250mA from 5V InputUses Small Surface Mount L/C Components?Wide Input Range: 4.2V to 8V?Low VCESAT Switch: 600mV at 600mA?6-Lead 3x3mm JEDEC MO-229 Package?Functionally Compatible with LT1611 or LT1931???ROHS, PB Free-->??ROHS