LTC3610EWP LINER [Linear Technology], LTC3610EWP Datasheet - Page 18

• Manufacturer Part Number: LTC3610EWP
• Description: 24V, 12A Monolithic Synchronous Step-Down DC/DC Converter
• Manufacturer: LINER [Linear Technology]

APPLICATIONS INFORMATION
LTC3610
• 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.
18
2.5V AT
V
GND
12A
OUT
cooling of the MOSFETs and to keep EMI down.
fi ltering 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 24V
22μF
10μF
6.3V
35V
C
C5
3×
IN
V
IN
IN
C
C
L1: CDEP85NP-R80MC-50
C5: MURATA GRM31CR60J226KE19
, V
IN
OUT
(OPTIONAL)
: TAIYO YUDEN GMK325BJ106MM-B
: SANYO 10TPE220ML
C
220μF
R
OUT
0Ω
OUT1
10μF
X1
35V
C6
2×
, GND or to any other DC rail in your
+
+
IN
GND
0.8μH
L1
and V
GND
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 24V Input to 2.5V/12A 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
LTC3610
D
B
26 27 28 29 30 31 32
SW
SW
INTV
54
SW
53
CC
C
0.22μF
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
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
C
0.1μF
SS
EXTV
PGOOD
C
0.1μF
25V
SGND
SGND
SGND
SGND
SGND
SGND
SGND
F
V
RNG
V
FCB
V
I
I
ON
ON
CC
TH
FB
IN
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
R
1Ω
and PGND pins.
F1
CC
V
IN
(OPTIONAL)
IN
and PGND pins.
R
510k
SS1
C4
0.01μF
pin decoupling capacitor C
CC
R3
0Ω
EXTV
decoupling capacitor C
V
R
100k
IN
C
0.01μF
PG1
CC
ON
INTV
R1
9.5k
1%
CC
(OPTIONAL)
182k
R
1%
ON
(OPTIONAL)
(OPTIONAL)
C1
IN
C3
close to the IC. This
31.84k
R5
R2
30.1k
1%
470pF
100pF
R
B
C
C
0Ω
VON
F
VCC
C1
C2
closely to
closely to
closely
(OPTIONAL)
3610 F06
C2
3610fd
V
V
V
SGND
OUT
IN
OUT