LTC1628CG-SYNC View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC1628CG-SYNC' PDF : 32 Pages View PDF
APPLICATIO S I FOR ATIO
LTC1628-SYNC
SW1
L1
RSENSE1 VOUT1
+
D1
COUT1
RL1
VIN
RIN
+
CIN
BOLD LINES INDICATE
HIGH, SWITCHING
CURRENT LINES.
KEEP LINES TO A
MINIMUM LENGTH.
SW2
D2
L2
RSENSE2 VOUT2
+
COUT2
RL2
1628 F11
Figure 11. Branch Current Waveforms
signal ground. The R2 and R4 connections should not be
along the high current input feeds from the input
capacitor(s).
4. Are the SENSE – and SENSE + leads routed together
with minimum PC trace spacing? The filter capacitor
between SENSE + and SENSE – should be as close as
possible to the IC. Ensure accurate current sensing with
Kelvin connections at the SENSE resistor.
5. Is the INTVCC decoupling capacitor connected close to
the IC, between the INTVCC and the power ground pins?
This capacitor carries the MOSFET drivers current peaks.
An additional 1µF ceramic capacitor placed immediately
next to the INTVCC and PGND pins can help improve noise
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 LTC1628-SYNC and occupy minimum PC trace
area.
27
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