參數(shù)資料
型號(hào)： LTC3823IGN#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 4 A SWITCHING CONTROLLER, PDSO28
封裝： 0.150 INCH, LEAD FREE, PLASTIC, SSOP-28
文件頁數(shù)： 14/26頁
文件大小： 302K
代理商： LTC3823IGN#TRPBF
LTC3823
21
3823fd
Place CIN, COUT, MOSFETs, D1 and inductor all in one
compact area. It may help to have some components
on the bottom side of the board.
Use an immediate via to connect the components to
ground plane including SGND and PGND of LTC3823.
Use several bigger vias for power components.
Use compact plane for switch node (SW) to improve
cooling of the MOSFETs and to keep EMI down.
Use planes for VIN and VOUT to maintain good voltage
ltering and to keep power losses low.
Flood all unused areas on all layers with copper. Flooding
with copper will reduce the temperature rise of power
component. You can connect the copper areas to any
DC net (VIN, VOUT, GND or to any other DC rail in your
system).
When laying out a printed circuit board, without a ground
plane, use the following checklist to ensure proper opera-
tion of the controller.
3823 F12
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
FCB
RUN
VON
PGOOD
VRNG
VFB
ITH
SGND
ION
VDIFFOUT
VOUTSENSE+
VOUTSENSE–
TRACK/SS
PLLFLTR
GND
PGOOD
VRNG
INTVCC
VITH
ION
DIFFOUT
FB
TRACK/SS
RUN
Z0
BOOST
TG
SW
SENSE+
SENSE–
PGND
BG
INTVCC
Z2
Z1/SSENABLE
ZVCC
VIN
PLLIN
LTC3823GN
R6
7.5k
R5
42.5k
RON
100k
R2
16.2k
R1
5.11k
RC
1.5k
RPG
100k
CC2
100pF
CC1
6800pF
C4
220pF
CSS
0.1μF
1000pF
10k
CVCC
4.7μF
DB
CMDSH-3
D1
B320A
+
COUT3
47μF
X5R
3
COUT1
220μF
4V
VOUT
2.5V
10A
VIN
5V TO 28V
+
CIN
10μF
50V
3
CB
0.22μF
R7
23.2k
R8
27.1k
M1
Si7342DP
L1
1.2μH
M2
Si7892ADP
PLLIN
+
0.01μF
Figure 12. Design Example: 2.5V/7A at 320kHz
Segregate the signal and power grounds. All small-
signal components should return to the SGND pin at
one point which is then tied to the PGND pin close to
the source of M2.
Place M2 as close to the controller as possible, keeping
the PGND, BG and SW traces short.
Connect the input capacitor(s) CIN close to the power
MOSFETs. This capacitor carries the MOSFET AC
current.
Keep the high dV/dt SW, BOOST and TG nodes away
from sensitive small-signal nodes.
Connect the INTVCC decoupling capacitor CVCC closely
to the INTVCC and PGND pins.
Connect the top driver boost capacitor CB closely to
the BOOST and SW pins.
Connect the VIN pin decoupling capacitor CIN closely
to the VIN and PGND pins.
APPLICATIONS INFORMATION
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