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RT9986 数据表(PDF) 21 Page - Richtek Technology Corporation

部件名 RT9986
功能描述  7-CH DC/DC Converter for DSC
PDF  24 Pages
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制造商  RICHTEK [Richtek Technology Corporation]
网页  http://www.richtek.com
标志 RICHTEK - Richtek Technology Corporation

RT9986 数据表(HTML) 21 Page - Richtek Technology Corporation

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21
DS9986-00 May 2011
www.richtek.com
RT9986
Figure 1. Derating Curves for RT9986 Packages
Layout Consideration
For the best performance of the RT9986, the following
PCB layout guidelines must be strictly followed.
}
Place the input and output capacitors as close as
possible to the input and output pins respectively for
good filtering.
}
Keep the main power traces as wide and short as
possible.
}
The switching node area connected to LX and inductor
should be minimized for lower EMI.
}
Place the feedback components as close as possible
to the FB pin and keep these components away from
the noisy devices.
}
Connect the GND and Exposed Pad to a strong ground
plane for maximum thermal dissipation and noise
protection.
Figure 2. PCB Layout Guide
L3
GND
C8
R5
R6
C7
VOUT_CH3
Input/Output capacitors must be placed as
close as possible to the Input/Output pins.
LX should be connected to Inductor by wide and short
trace, keep sensitive components away from this trace
Place the feedback components as close as possible to
the FB pin and keep away from noisy devices.
Connect the
Exposed Pad to
a ground plane.
FB1
VOUT6
FB6
VREF
FB2
VDDM
RTCPWR
SYSR
PVDD7
FB7
PVDD5
LX5
LX7
FB5
EN7
33
24
23
22
21
1
2
3
4
10
11
12
13
31
30
29
28
20
19
5
6
9
32
14
27
18
7
15
26
16
25
17
8
GND
RST
D1
C18
C15
R11
R12
C16
GND
LX6
VOUT_CH6
L7
C19
C20
R13
D4
D3
D2
L4
VBAT
R1
R2
GND
C4
L1
C21
GND
VBAT
GND
C10
R7
R8
C9
VOUT_CH4
VBAT
C1
C14
VOUT_CH5
GND
L5
C13
GND
L6
C2
C6
VBAT
VOUT_CH1
C3
GND
L2
GND
C5
R3
C22
R4
VOUT_CH2
C12
R9
R10
0.0
0.4
0.8
1.2
1.6
2.0
2.4
2.8
3.2
3.6
4.0
0
25
50
75
100
125
Ambient Temperature (
°C)
Four-Layers PCB



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