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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.

KEY FEATURES

◾ Fixed 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 Input

◾ Uses Small Surface Mount L/C Components

◾ Wide Input Range: 4.2V to 8V

◾ Low VCESAT Switch: 600mV at 600mA

◾ 6-Lead 3x3mm JEDEC MLPM Package

◾ Functionally Compatible with LT1611 or LT1931

APPLICATIONS/BENEFITS

◾ Disk Drive MR Head Bias

◾ Digital Camera CCD Bias

◾ LCD Bias

◾ GaAs FET Bias

◾ Local -5V or -12V Supplies