User Guide 053
UG053.1
October 26, 2015
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3
In
Table 2
, the minimum output capacitor value is given for
different output voltages with internal compensation. Notice that
the voltage rating has large effect on the actual capacitance
value for ceramic technology. The effective capacitance varies
with different V
OUT
, therefore, it is better to use a high voltage
rating capacitor or a set of parallel lower voltage rating
capacitors.
Additional output capacitance may be added to improve
transient response and start-up performance.
With additional capacitance, please use external compensation
for better loop response design. See the datasheet
compensation section for more detail. Refer to
Figures 11
through
16
for examples of 1.2V
OUT
and 3.3V
OUT
soft-start
waveforms, load transient and relevant bode plot with external
compensation configuration”.
TABLE 2. COMPONENT VALUE SELECTION (REFER
TO
“ISL8018EVAL3Z Schematic” on page 4
)
V
OUT
1.2V
1.5V
1.8V
2.5V
3.3V
C
1
, C
2
22µF
22µF
22µF
22µF
22µF
C
7
, C
8
66µF
66µF
47µF
47µF
47µF
C
4
33pF
33pF
10pF
10pF
10pF
L1
0.47µH
0.47~1µH
0.68~1.5µH
1~1.5µH
1~2.2µH
R1
100k
150k
200k
316k
450k
R2
100k
100k
100k
100k
100k
ISL8018EVAL3Z Evaluation Board
FIGURE 2. FRONT VIEW
FIGURE 3. BACK VIEW
1
