SNVAA98 January   2024 LM25148 , LM74910-Q1 , TPS38700 , TPS389006 , TPS389006-Q1 , TPS628301 , TPS628302 , TPS628303 , TPS6287B10 , TPS6287B15 , TPS6287B20 , TPS6287B25 , TPS746

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. Introduction
  5. Design Parameters
  6. Schematics
  7. Design Considerations
  8. Front-End Protection
  9. 3.3V Always-ON Bias Supply
  10. 5V Pre-Regulator Buck Converter
  11. Low-Voltage High-Current Core Rail Buck Converter
  12. On-Board Core Rail Output Load Transient Stepper
  13. 10Multiple Peripheral Rail Buck Converters Sub-Circuits Schematic
  14. 11Voltage Supervisor and Sequencer
  15. 1212-Channel Sequencer Alternative
  16. 13Summary
  17. 14References

12-Channel Sequencer Alternative

GUID-20231120-SS0I-GTFM-MGMP-8VJ5S8LSF2XW-low.svg Figure 12-1 12-Channel Sequencer Sub-Circuit Schematic

An alternative, expanded option to the 6-channel TPS38700S sequencer is the 12-channel TPS38700C. Though this device has double the enable channels, the device3 does not have the communication capability with the TPS389006 supervisor through a SYNC pin. The TPS38700C that is currently available has push-pull outputs, however there can be open-drain output variants made available sometime in the future. The sub-circuit depicted in Figure 12-1 schematic shows the capability of using both output variants: use the pull-up resistors with the open-drain output variant and omit these when using the push-pull output variant. If the open-drain output variant of the device is used, each of the ENx outputs can be pulled up to their corresponding HIGH-level voltage. All ENx pins are pulled up to the same 3.3V supply for simpler demonstration purposes.

The TPS38700CxxxRGER sequencer IC is a generic placeholder. The part can be factory trimmed to accommodate custom specifications. Contact a Texas Instruments representative to discuss customization offerings.