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| LTC3610EWPPBF Datasheet, PDF (18/24 Pages) Linear Technology – 24V, 12A Monolithic Synchronous Step-Down DC/DC Converter | |||
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LTC3610
Applications Information
COUT
VOUT
CIN
CVCC SW
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
1 PGND
2 PGND
3 PGND
4 SW
5 SW
6 SW
7 SW
8 SW
9 SW
10 SW
11 SW
12 PVIN
13 PVIN
14 PVIN
15 PVIN
16 PVIN
LTC3610
SGND 48
SGND 47
SGND 46
SGND 45
EXTVCC 44
VFB 43
SGND 42
ION 41
SGND 40
FCB 39
ITH 38
VRNG 37
PGOOD 36
VON 35
SGND 34
33
R1
R2
RON
RC CC1
CC2
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
DB
CB
Figure 7. LTC3610 Layout Diagram
CSS
RF
3610 F07
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.
⢠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.
⢠Connect the input capacitor(s), CIN, close to the IC.
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, CF, closely
to the VIN and PGND pins.
3610ff
18
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