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AN9993
V V2_SD
1V/DIV
V DDQ
1V/DIV
V DDQ
10mV/DIV
V TT
1V/DIV
1s/DIV
FIGURE 5. V TT SLEEP MODE
V V2_SD
1V/DIV
V DDQ
1V/DIV
V TT
1V/DIV
50 μ s/DIV
FIGURE 6. V TT RETURN FROM SLEEP MODE
other than the internally generated 50%. Please refer to the
datasheet for proper component selection.
In order to increase performance during a load transient on
either output, two 0603 capacitor pads have been provided
at each output. These pads allow the designer to add
ceramic capacitors on the output. Ceramic capacitors help to
decrease the overall output capacitance ESR while they
have much lower lead inductance. The pad reference
designators are C20 and C21 for the V TT output and
reference designators C13 and C14 for the V DDQ output.
The VDDQ output also has two extra bulk capacitor pads,
designated C11 and C12. The designer may wish to utilize
these to decrease the ripple voltage, improve transient
performance or both.
Ripple Voltage
V TT
10mV/DIV
5 μ s/DIV
FIGURE 7. V DDQ AND V TT RIPPLE VOLTAGES
shows V DDQ under transient loading. Figure 9 shows V TT
under a transient loading that causes V TT to source current.
Figure 10 shows V TT under a transient that causes V TT to
sink current. Figure 11 shows both V DDQ and V TT under
simultaneous transient loading.
V DDQ
100mV/DIV
V TT
100mV/DIV
V DDQ Load Current
5A/DIV
200 μ s/DIV
FIGURE 8. TRANSIENT ON V DDQ
V DDQ
50mV/DIV
V TT
50mV/DIV
Figure 7 shows the ripple voltage on both the V DDQ output
and the V TT output.
Transient Performance
Figures 8, 9, 10 and 11 show the response of the outputs
when subjected to a variety of transient loads. Figure 8
3
0A
V TT Load Current
5A/DIV
200 μ s/DIV
FIGURE 9. SOURCING TRANSIENT ON V TT
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