SCEA144 December   2024 LSF0101 , LSF0102 , LSF0108 , LSF0204

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1How Does the LSF000x Differentiate From the LSF010x During Setup?
  5. 2How is the Internal Body Diode of the LSF NMOS Configured?
  6. 3Are Pullup Resistors Required for Push-Pull Applications with the LSF?
  7. 4How is Power Consumption Calculated for LSF Devices?
  8. 5Can I use LDO as a Power Supply?
  9. 6What if my I/Os Operate Lower Than VREFA?
  10. 7Summary
  11. 8References

1 How Does the LSF000x Differentiate From the LSF010x During Setup?

Both variants of the LSF devices share similar architecture, but the LSF000x design requirements are less stringent than the LSF010x. The LSF000x only uses one power supply to directly bias the gates of the channel FETs to perform translation, removing the requirement to operate with two power supplies. Since LSF000x can operate with a single power supply, the device eliminates the need for VREFB to be shorted to EN, as well as the external 200kΩ bias resistor. The key consideration with the LSF000x is that VBIAS must be referenced to the lower voltage of VEXT,A and VEXT,B. Figure 1-1 depicts setup differences:

LSF000x Setup Figure 1-1 LSF000x Setup
LSF010x Setup Figure 1-2 LSF010x Setup