LTC3611EWP LINER [Linear Technology], LTC3611EWP Datasheet - Page 18

• Manufacturer Part Number: LTC3611EWP
• Description: 10A, 32V Monolithic Synchronous Step-Down DC/DC Converter
• Manufacturer: LINER [Linear Technology]

LTC3611
APPLICATIONS INFORMATION
• Use a compact plane for the switch node (SW) to improve
• Use planes for V
• Flood all unused areas on all layers with copper. Flood-
When laying out a printed circuit board without a ground
plane, use the following checklist to ensure proper opera-
tion of the controller. These items are also illustrated in
Figure 7.
2.5V AT
18
V
GND
10A
OUT
cooling of the MOSFETs and to keep EMI down.
filtering and to keep power losses low.
ing with copper reduces the temperature rise of power
components. Connect these copper areas to any DC
net (V
system).
(OPTIONAL)
5V TO 32V
4.7μF
22μF
6.3V
50V
C
C5
×2
IN
V
IN
IN
C
C
L
C5: MURATA GRM31CR60J226KE19
KEEP POWER AND SIGNAL GROUNDS SEPARATE.
CONNECT TO ONE POINT.
, V
IN
OUT
1
(OPTIONAL)
= COOPER HCP0703-IRO
= MURATA GRM32ER71H475K
C
100μF
= MURATA GRM43SR60J107M
100μF
OUT
OUT1
50V
×2
C6
+
, GND or to any other DC rail in your
GND
IN
1μH
L1
and V
PGND
V
IN
10
11
12
13
14
15
16
OUT
1
2
3
4
5
6
7
8
9
PGND
PGND
PGND
SW
SW
SW
SW
SW
SW
SW
SW
PV
PV
PV
PV
PV
Figure 6. Design Example: 5V to 32V Input to 2.5V/10A at 550kHz
IN
IN
IN
IN
IN
64 63 62 61 60 59 58 57 56 55
17 18 19 20 21 22 23 24 25
to maintain good voltage
INTV
CC
4.7μF
C
6.3V
VCC
CMDSH-3
LTC3611
D
B
26 27 28 29 30 31 32
SW
SW
INTV
54
SW
CC
53
C
0.22μF
2Ω
B1
52 51 50 49
• Segregate the signal and power grounds. All small
• Connect the input capacitor(s) C
• Keep the high dV/dT SW, BOOST and TG nodes away
• Connect the INTV
• Connect the top driver boost capacitor C
• Connect the V
C
0.1μF
signal components should return to the SGND pin at
one point, which is then tied to the PGND pin.
capacitor carries the MOSFET AC current.
from sensitive small-signal nodes.
to the INTV
the BOOST and SW pins.
the V
SS
EXTV
PGOOD
C
0.1μF
50V
SGND
SGND
SGND
SGND
SGND
SGND
SGND
F
V
FCB
RNG
V
V
I
I
ON
ON
CC
FB
TH
IN
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
and PGND pins.
V
IN
SGND
(OPTIONAL)
CC
R
510k
SS1
IN
and PGND pins.
C4
0.01μF
pin decoupling capacitor C
CC
R3
11k
V
IN
EXTV
decoupling capacitor C
39.2k
R
100k
C
0.01μF
PG1
CC
ON
INTV
R1
9.5k
1%
CC
(OPTIONAL)
182k
R
1%
ON
(OPTIONAL)
C1
0.01μF
IN
close to the IC. This
12.5k
R5
R2
30.1k
1%
680pF
100pF
R
B
C
C
0Ω
VON
VCC
F
C1
C2
closely to
closely to
closely
(OPTIONAL)
3611 F06
C2
3611fb
V
V
V
SGND
OUT
IN
OUT