MIC22600_11 Datasheet, PDF (17/32 Pages) Micrel Semiconductor – 1MHz, 6A Integrated Switch Synchronous Buck Regulator

Micrel, Inc.
Ratio Metric Tracking:
MIC22600
DDR Memory VDD and VTT Tracking
Figure 9. Ratio Metric Tracking Circuit
Figure 11. DDR Memory Tracking Circuit
Figure 10. Ratio Metric Tracking Example
An alternative method here shows an example of a V_DDQ
& V_TT solution for a DDR memory power supply. Note
that POR is taken from Vo1 as POR₂ will not go high.
This is because POR is set high when FB > 0.9⋅V_REF. In
this example, FB₂ is regulated to ½⋅V_REF.
Figure 12. DDR Memory Tracking Example
June 2011
17
M9999-062411-D