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Hysteretic PFET Buck Controller



  • Easy to use control methodology
  • 0.8V to VIN adjustable output range
  • High Efficiency (90% typical)
  • 0.9% (1/5% over temp) feedback voltage
  • 100% duty cycle capable
  • Maximum operating frequency up to 2MHz
  • Internal Soft-Start
  • Enable pin
  • SOT23-5 package


  • TFT Monitor
  • Auto PC
  • Vehicle Security
  • Navigation Systems
  • Notebook Standy Supply
  • Battery Powered Portable Applications
  • Distributed Power Systems


Texas Instruments  LM3475EVAL

The LM3475 evaluation board is provided as a tool for developing DC/DC converters based on the LM3475 IC. As shown in Figure 1, the evaluation board is configured to provide an output of 2.5V at up to 2A from an input up to 10V. The corresponding bill of material is given in Table 1. Typical efficiencies are shown in Figure 2 and Figure 3. Figure 4 and Figure 5 show the board layout.