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ADP2311ACPZ-2-R7 Scheda tecnica(PDF) 18 Page - Analog Devices

Il numero della parte ADP2311ACPZ-2-R7
Spiegazioni elettronici  Dual 1 A, 18 V, Synchronous Step-Down Regulator with Fail-Safe Voltage Monitoring
PDF  20 Pages
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
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ADP2311ACPZ-2-R7 Scheda tecnica(HTML) 18 Page - Analog Devices

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ADP2311
Data Sheet
Rev. B | Page 18 of 20
OUTPUT CAPACITOR SELECTION
The output capacitor selection affects both the output voltage
ripple and the loop dynamics of the regulator. The ADP2311 is
designed to operate with small ceramic capacitors that have low
equivalent series resistance (ESR) and low equivalent series
inductance (ESL) and can, therefore, easily meet the output
voltage ripple specifications.
When the regulator operates in continuous conduction mode, the
overall output voltage ripple is the sum of the voltage spike caused
by the output capacitor ESR plus the voltage ripple caused by the
charging and discharging of the output capacitor.
+
×
×
×
∆
=
∆
OUT
C
OUT
SW
L
RIPPLE
ESR
C
f
I
V
8
1
Capacitors with lower ESR are preferable to guarantee low output
voltage ripple, as shown in the following equation:
L
RIPPLE
C
I
V
ESR
OUT
∆
∆
≤
Ceramic capacitors are manufactured with a variety of dielectrics,
each with different behavior over temperature and applied voltage.
X5R or X7R dielectrics are recommended for best performance
due to their low ESR and small temperature coefficients.
Table 7 lists recommended output capacitors for VOUT ≤ 5.0 V.
Table 7. Recommended Output Capacitors for VOUT ≤ 5.0 V
Vendor
Part No.
Value
Murata
GRM31CR60J226KE19
22 μF, 6.3 V, X5R
GRM32ER60J476ME20
47 μF, 6.3 V, X5R
TDK
C3216X5R0J226M160AA
22 μF, 6.3 V, X5R
C3216X5R0J336M130AC
33 μF, 6.3 V, X5R
C3216X5R0J476M160AC
47 μF, 6.3 V, X5R
Table 8 lists the recommended external inductors and output
capacitors for typical applications with the ADP2311.
Table 8. Recommended External Components for Typical
Applications
VIN (V)
VOUT (V)
L (µH)
COUT (µF)
RTOP (kΩ),
±1%
RBOT (kΩ),
±1%
12
1.0
10
2 × 47
10
15
12
1.2
10
2 × 47
10
10
12
1.5
15
2 × 47
15
10
12
1.8
15
47
20
10
12
2.5
22
47
47.5
15
12
3.3
22
22
10
2.21
12
5.0
33
22
22
3
5
1.0
10
2 × 47
10
15
5
1.2
10
2 × 47
10
10
5
1.5
10
47
15
10
5
1.8
10
47
20
10
5
2.5
10
22
47.5
15
5
3.3
10
22
10
2.21



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