LTC3770EUH#TR Linear Technology, LTC3770EUH#TR Datasheet - Page 21

• Manufacturer Part Number: LTC3770EUH#TR
• Manufacturer: Linear Technology

Specifications of LTC3770EUH#TR

• Lead Free Status / RoHS Status: Not Compliant

APPLICATIONS INFORMATION
To set a ±25% margining, select the resistors R3, R4
such that:
Choose R3 to be 10k, R4 to be 82k for this application.
PC Board Layout Checklist
When laying out a PC board follow one of two suggested
approaches. The simple PC board layout requires a
dedicated ground plane layer. Also, for higher currents,
it is recommended to use a multilayer board to help with
heat sinking power components.
• The ground plane layer should not have any traces and
or
R5
39k
R6
11k
V
R
1 18
REFIN
R1
30.1k
4 8 3
.
≈
R
R
20k
C
CC1
500pF
4
•
R
R
=
3
0 6 25
95.3k
.
=
R2
R7
47k
R8
51k
CC2
100pF
25
±
% • .
R
75k
% • .
INTV
ON
0 6
10k
5V
R3
82k
CC
RUN
0 6
R
100k
R4
PG
10
11
12
13
14
1
2
3
4
5
6
7
8
9
C
0.1μF
SS
RUN
V
PGOOD
V
V
I
SGND
MARGIN1
MARGIN0
I
V
V
MPGM
TRACK/SS
TH
ON
ON
RNG
FB
REFIN
REFOUT
Figure 12. Design Example: 2.5V/10A at 450kHz
LTC3770EG
PLLFLTR
INTV
BOOST
PLLIN
PGND
Z
FCB
SW
V
VIN
BG
TG
Z0
CC
Z1
Z2
IN
28
27
26
25
24
23
22
21
20
19
18
17
16
15
0.1μF
CV
IN
• Place C
• Use an immediate via to connect the components to
• Use compact plane for switch node (SW) to improve
• Use planes for V
• Flood all unused areas on all layers with copper. Flooding
it should be as close as possible to the layer with power
MOSFETs.
compact area. It may help to have some components
on the bottom side of the board.
ground plane including SGND and PGND of LTC3770.
Use several bigger vias for power components.
cooling of the MOSFETs and to keep EMI down.
fi ltering and to keep power losses low.
with copper will reduce the temperature rise of power
component. You can connect the copper areas to any
DC net (V
system).
L1: SUMIDA CEP125-1R8MC-H
C
C
OUT
IN
: UNITED CHEMICON THCR60E1H106ZT
: CORNELL DUBILIER ESRE181E04B
+
+
IN
, C
IN
CB
0.22μF
DB
CMDSH-3
CV
4.7μF
CC
, V
OUT
OUT
, MOSFETs, D1 and inductor all in one
IN
M1
Si4884
B340A
M2
Si4874
, GND or to any other DC rail in your
and V
D1
1.8μH
L1
OUT
C
23μF
x5R
x2
to maintain good voltage
OUT3
+
LTC3770
C
180μF
4V
x2
V
2.5V
10A
OUT1-2
OUT
3770 F12
C
10μF
50V
x3
V
5V TO 28V
IN
21
IN
3770fc