Datasheet

LTC3708
25
3708fb
APPLICATIONS INFORMATION
• Connect the decoupling capacitors C
DR1
and C
DR2
close to the DRV
CC
and PGND pins. Connect C
B1
and
C
B2
close to the BOOST and SW pins.
• Connect the decoupling capacitor C
VCC
right across the
V
CC
pin and SGND plane. Connect the EA compensation
components close to the I
TH
pins. Connect the PLL loop
fi lter close to the EXTLPF and INTLPF pins. Connect the
I
ON
decoupling capacitor close to the I
ON
pins.
• Flood all unused areas on all layers with copper.
Flooding will reduce the temperature rise of the power
components. You can connect the copper area to any
DC net (V
IN
, V
OUT
, GND or to any other DC rail in your
system).
V
FB1
I
TH1
I
ON1
EXTLPF
TRACK1
V
RNG1
V
CC
5V
C
VCC
C
DR1
C
B1
5V
C
DR2
C
SS
SGND
RUN/SS
V
RNG2
TRACK2
INTLPF
I
ON2
I
TH2
V
FB2
R
ON2
R
ON1
TG1
FCB PGOOD
SW1
BOOST
LTC3708
SENSE1
+
SENSE1
–
PGND1
BG1
DRV
CC
BG2
PGND2
SENSE2
–
SENSE2
+
BOOST2
SW2
TG2
R1
R3
R4
R2
3708 F15
C
OUT1
C
OUT2
C
B2
V
IN
M3
C
IN1
C
IN2
D1
L1
L2
M1
M2
M4
D2
Figure 14. LTC3708 Layout Diagram