ISL9103 Maxim Integrated Products, ISL9103 Datasheet - Page 12

• Manufacturer Part Number: ISL9103
• Description: 500mA 2.4MHz Low IQ High Efficiency Synchronous Buck Converter
• Manufacturer: Maxim Integrated Products

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minimize the accuracy impact on the output voltage, select
the R
For adjustable output versions, C3 (shown in Figure 21) is
highly recommended for improving stability and achieving
better transient response.
Table 2 provides the recommended component values for
some output voltage options.
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VOUT
TABLE 2. RECOMMENDED ISL9103, ISL9103A ADJUSTABLE
0.8
1.0
1.2
1.5
1.8
2.5
2.8
3.3
(V)
2
no larger than 200kΩ.
OUTPUT VERSION CIRCUIT CONFIGURATION vs
V
(µH)
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
OUT
L
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(µF)
C2
10
10
10
10
10
10
10
10
12
(kΩ)
44.2
80.6
84.5
100
100
100
102
R1
0
(pF)
N/A
100
C3
47
47
47
47
47
47
ISL9103, ISL9103A
(kΩ)
97.6
80.6
47.5
40.2
32.4
N/A
178
162
R2
Layout Recommendation
The PCB layout is a very important converter design step to
make sure the designed converter works well, especially
under the high current high switching frequency condition.
For ISL9103, ISL9103A, the power loop is composed of the
output inductor L, the output capacitor C
the PGND pin. It is necessary to make the power loop as
small as possible and the connecting traces among them
should be direct, short and wide; the same type of traces
should be used to connect the VIN pin, the input capacitor
C
The switching node of the converter, the SW pin, and the
traces connected to this node are very noisy, so keep the
voltage feedback trace and other noise sensitive traces
away from these noisy traces.
The input capacitor should be placed as close as possible to
the VIN pin. The ground of the input and output capacitors
should be connected as close as possible as well. In
addition, a solid ground plane is helpful for EMI performance.
IN
and its ground.
OUT
, the SW pin and
June 26, 2009
FN6828.1