LTC3830 LINER [Linear Technology], LTC3830 Datasheet - Page 19

• Manufacturer Part Number: LTC3830
• Description: High Power Step-Down Synchronous DC/DC Controllers for Low Voltage Operation
• Manufacturer: LINER [Linear Technology]

APPLICATIO S I FOR ATIO
3. The small-signal resistors and capacitors for frequency
compensation and soft-start should be located very close
to their respective pins and the ground ends connected to
the signal ground pin through a separate trace. Do not
connect these parts to the ground plane!
4. The V
be as close to the LTC3830 as possible. The 4.7 F and 1 F
bypass capacitors shown at V
provide optimum regulation performance.
CC
, PV
CC1
and PV
4.7 F
U
C1
C
C
R
C
+
CC2
U
decoupling capacitors should
GND
CC
C
, PV
1 F
NC
SS
Figure 11. Typical Schematic Showing Layout Considerations
GND
CC1
W
FREQSET
SHDN
COMP
SS
GND
V
and PV
CC
LTC3830
100
SENSE
SENSE
PV
PGND
PV
I
CC2
CC2
MAX
CC1
G1
I
G2
FB
U
FB
+
–
will help
PV
CC
PGND
NC
1 F
5. The (+) plate of C
possible to the drain of the upper MOSFET, Q1. An addi-
tional 1 F ceramic capacitor between V
is recommended.
6. The SENSE and V
the switching node. Care should be taken to isolate SENSE
and V
switching signal. Connecting the SENSE
to the load can significantly improve load regulation.
7. Kelvin sense I
0.1 F
FB
from possible capacitive coupling to the inductor
1k
Q1A
MAX
PGND
V
IN
FB
Q2
LTC3830/LTC3830-1
and I
IN
pins are very sensitive to pickup from
should be connected as close as
Q1B
FB
+
at Q1’s drain and source pins.
C
IN
L
O
+
IN
3830 F11
+
C
and power ground
V
and SENSE
OUT
OUT
sn3830 3830fs
19
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