LTC3728LX Linear Technology, LTC3728LX Datasheet - Page 27

• Manufacturer Part Number: LTC3728LX
• Description: 2-Phase Synchronous Regulators
• Manufacturer: Linear Technology

APPLICATIO S I FOR ATIO
C
should not be along the high current input feeds from the
input capacitor(s).
4. Are the SENSE
with minimum PC trace spacing? The filter capacitor
between SENSE
possible to the IC. Ensure accurate current sensing with
Kelvin connections at the SENSE resistor.
5. Is the INTV
the IC, between the INTV
This capacitor carries the MOSFET drivers current peaks.
OUT
and signal ground. The R2 and R4 connections
R
CC
IN
decoupling capacitor connected close to
V
+
IN
–
and SENSE
U
C
IN
and SENSE
BOLD LINES INDICATE
HIGH SWITCHING
CURRENT. KEEP LINES
TO A MINIMUM LENGTH.
+
CC
U
and the power ground pins?
–
+
should be as close as
leads routed together
W
Figure 11. Branch Current Waveforms
CERAMIC
CERAMIC
U
SW1
SW2
D1
D2
An additional 1 F ceramic capacitor placed immediately
next to the INTV
performance substantially.
6. Keep the switching nodes (SW1, SW2), top gate nodes
(TG1, TG2), and boost nodes (BOOST1, BOOST2) away
from sensitive small-signal nodes, especially from the
opposites channel’s voltage and current sensing feedback
pins. All of these nodes have very large and fast moving
signals and therefore should be kept on the “output side”
of the LTC3728L/LTC3728LX and occupy minimum PC
trace area.
L1
L2
R
R
SENSE1
SENSE2
LTC3728L/LTC3728LX
C
C
OUT1
OUT2
CC
and PGND pins can help improve noise
V
V
+
+
OUT1
OUT2
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3728 F11
R
R
L1
L2
27
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