ltc3728legn-1-tr Linear Technology Corporation, ltc3728legn-1-tr Datasheet - Page 27

• Manufacturer Part Number: ltc3728legn-1-tr
• Description: Dual, 550khz, 2-phase Synchronous Regulator
• Manufacturer: Linear Technology Corporation

APPLICATIONS INFORMATION
be connected between the (+) terminal of C
ground. The R2 and R4 connections should not be along
the high current input feeds from the input capacitor(s).
4. Are the SENSE
minimum PC trace spacing? The fi lter capacitor between
SENSE
the IC. Ensure accurate current sensing with Kelvin con-
nections at the SENSE resistor.
5. Is the INTV
the IC, between the INTV
+
and SENSE
R
IN
CC
V
decoupling capacitor connected close to
IN
–
and SENSE
C
IN
BOLD LINES INDICATE
HIGH SWITCHING
CURRENT. KEEP LINES
TO A MINIMUM LENGTH.
–
+
should be as close as possible to
CC
and the power ground pins?
+
leads routed together with
Figure 11. Branch Current Waveforms
OUT
CERAMIC
CERAMIC
and signal
SW1
SW2
D1
D2
This capacitor carries the MOSFET drivers current peaks.
An additional 1μF 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-1 and occupy minimum PC trace area.
L1
L2
R
R
SENSE1
SENSE2
C
C
OUT1
OUT2
CC
V
V
and PGND pins can help improve noise
+
+
OUT1
OUT2
LTC3728L-1
3728L1 F11
R
R
L1
L2
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3728l1fc