AN9993
96%
94%
V DDQ
50mV/DIV
V TT
50mV/DIV
92%
90%
88%
86%
84%
0A
V TT Load Current
5A/DIV
82%
80%
0
1
2
3
4
5
6
7
8
9
10
200 μ s/DIV
FIGURE 10. SINKING TRANSIENT ON V TT
V DDQ
100mV/DIV
V TT
100mV/DIV
V TT Load Current
Load Current
FIGURE 13. V DDQ EFFICIENCY
Conclusion
0A
0A
5A/DIV
V DDQ Load Current
5A/DIV
The ISL6530/31EVAL1 board is a dual DC-DC converter
reference design for DDR Memory Power applications that
require up to 10A on V DDQ and up to 5A on V TT . In addition,
the design may be modified for applications with different
200 μ s/DIV
FIGURE 11. TRANSIENTS ON V DDQ AND V TT
Efficiency
Each channel of the ISL6530 is highly efficient which leads
to a high overall system efficiency. The efficiency of the V TT
regulator in current sourcing and current sinking modes is
shown in Figures 12. Figure 13 illustrates the efficiency of
the VDDQ regulator.
96%
95%
94%
93%
requirements.
References
For Intersil documents available on the web, see
http://www.intersil.com/
[1] ISL6530 Data Sheet, Intersil Corporation, FN9052
[2] ISL6531 Data Sheet, Intersil Corporation, FN9053
92%
91%
90%
89%
88%
87%
86%
V TT Sourcing
V TT Sinking
0
1
2
3
4
5
Load Current
FIGURE 12. V TT EFFICIENCY (SOURCING CURRENT)
4
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