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LX1734CLM Datasheet(PDF) 1 Page - Microsemi Corporation |
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LX1734CLM Datasheet(HTML) 1 Page - Microsemi Corporation |
1 / 8 page Microsemi Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 1 Copyright © 2002 Rev. 3.0a, 2005-03-14 LX1734 1.0MHz Inverting DC/DC Converter TM ® DESCRI PTI O N 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. IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com KEY FEATUR ES 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 PRODUCT H I GHLIGHT C1 10 µF V IN = 5V LX1734 V IN SW L1A 22 µH GND NFB C2 1 µF R2 10k R1 29.4k L1B 22 µH C3 22 µF V OUT = -5V @ 150mA C4 1000pF Note: L1A and L1B are shown as coupled. Individual inductors can also be used. C1, C2, C3 are ceramic capacitors SD Figure 1 PACKAGE ORDER INFO LM Plastic MLPL 6-Pin TA ( °C) RoHS Compliant / Pb-free Transition DC: 0452 0 to 85 LX1734CLM Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1734CLM-TR) |
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