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DA9131 Datasheet(PDF) 55 Page - Dialog Semiconductor

Part # DA9131
Description  High-Performance, Dual-Channel DC-DC Converter for Mobile and Portable Applications
PDF  56 Pages
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Manufacturer  DIALOG [Dialog Semiconductor]
Direct Link  http://www.dialog-semiconductor.com/
Logo DIALOG - Dialog Semiconductor

DA9131 Datasheet(HTML) 55 Page - Dialog Semiconductor

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DA9131
High-Performance, Dual-Channel DC-DC Converter for
Mobile and Portable Applications
Datasheet
Revision 2.0
11-Aug-2021
CFR0011-120-00
55 of 56
© 2021 Dialog Semiconductor
8
Application Information
The following recommended components are examples selected from requirements of a typical
application.
8.1
Capacitor Selection
Ceramic capacitors are used as bypass capacitors at all VDD and output rails. When selecting a
capacitor, especially for types with high capacitance at smallest physical dimension, the DC bias
characteristic has to be taken into account.
Table 62: Recommended Consumer Grade Capacitor Types
Application
Value
(µF)
Size
Temp. Char.
Tol.
(%)
V-Rate
(V)
Type
VOUT output
bypass
10
0402
X5R
20
6.3
Murata GRM155R60J106ME15
PVDDx
bypass
10
0603
X5R
20
25
Murata GRM188R61E106MA73
AVDD
bypass
1
0402
X5R
10
10
Murata GRM155R61A105KE15
Table 63: Recommended Automotive Grade Capacitor Types
Application
Value
(µF)
Size
Temp.
Char.
Tol.
(%)
V-Rate
(V)
Type
VOUT output
bypass
10
0805
X7R ±15%
±10
6.3
TDK CGA4J1X7R0J106K125AC
PVDDx
bypass
10
3216
X7R ±15%
±10
16
Murata GCM31CR71C106KA64L
AVDD
bypass
1
0805
X7R ±15%
±10
50
Murata GCM21BR71H105KA03L
8.2
Inductor Selection
Inductors should be selected based on the following parameters:
● Rated maximum current
Usually a coil provides two current limits: ISAT specifies the maximum current at which the
inductance drops by 30 % of the nominal value, and IMAX is defined by the maximum power
dissipation and is applied to the effective current.
● DC resistance
Critical for the converter efficiency and should therefore be minimized.
Table 64: Recommended Inductor Types
Value
(µH)
Size (mm)
IMAX (DC)
(A)
ISAT
(A)
Tol.
(%)
DC Resistance
(mΩ)
Type
0.22
2.5 x 2.0 x 1.2
6.7
8
20
8
TDK TFM252012ALMAR22MTAA
0.47
2.5 x 2.0 x 1.2
4.9
5.8
20
8
TDK TFM252012ALMAR47MTAA



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