Retired Product

This product has been retired from our catalog and is no longer for sale. This page is made available for those looking for datasheets and the simply curious.

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Description: Replacement: None. We are no longer offering this IC as a standalone product. This page is for reference only.

The LMZ14203 is a new power module from National Semiconductor and part of their Simple Switcher series. This IC is an easy-to-use step-down DC-DC solution capable of driving up to a 3A load with exceptional power conversion efficiency, line and load regulation, and output accuracy. The innovative TO-PMOD-7 package enhances thermal performance and allows for hand or machine soldering; the pins are each spaced by 1.27mm (0.05").

The LMZ14203 can step-down an input voltage of up to 42V to produce a configurable output voltage between 0.8 and 6V, all at up to 90% efficiency. Only three external resistors, and four capacitors are required to produce a step-down output from the IC. In addition the LMZ14203 provides a number of other features, including: thermal shutdown, input under-voltage lockout, output over-voltage protection, short-circuit protection, output current limit, and allows startup into a pre-biased output.


  • 18W maximum total output power
  • Up to 3A output current
  • Input voltage range 6V to 42V
  • Output voltage range 0.8V to 6V
  • Efficiency up to 90%
  • Integrated shielded inductor
  • Simple PCB layout
  • Flexible startup sequencing using external soft-start and precision enable
  • Protection against inrush currents and faults such as input UVLO and output short circuit
  • – 40°C to 125°C junction temperature range
  • Single exposed pad and standard pinout for easy mounting and manufacturing
  • Fast transient response for powering FPGAs and ASICs
  • Low output voltage ripple

Dimensions: 0.4 x 0.542 x 0.18 “ (10.16 x 13.77 x 4.57 mm)


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Customer Comments

  • When will these be back in stock?

    • Right now :-)

      • I see, just ordered through my importer.
        Where do you find those? In case I need a lot.
        Of course you probably can’t tell me, as you also earn some $$ on selling them, but I’m having a lot of trouble finding them.

  • i want to try to use this on my reprap project but its a little pricy still

  • I would not call it a home run for the cost. A Schottky and an inductor for 3A can be found under $3 for single quantity. I consider these two parts being integrated to be the real bonus.

  • When I spoke with a National Semic. sales rep. recently the other models weren’t quite out yet. I look forward to trying one out soon.
    FOOTPRINT: regarding the footprint, yes, like many other footprints on modern components it’s not the easiest for a hobbyist to deal with, but you must get used to making custom foot prints in your favorite CAD program. It’s just a fact of life.
    On the other hand, I can tell you the package is quite small and very efficient in terms of space and cost. I look forward to trying it out.

  • I like the footprint. This seems very similar in function to TI’s PTN78060 which I’ve used before. It only requires 1 resistor and 2 capacitors and also has 1.5 and 6A versions. The problem with it is it’s size and strange footprint.

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