LTC3855 LINER [Linear Technology], LTC3855 Datasheet - Page 43

• Manufacturer Part Number: LTC3855
• Description: Dual, Fast, Accurate Step-Down DC/DC Controller
• Manufacturer: LINER [Linear Technology]

APPLICATIONS INFORMATION
• The top N-channel MOSFETs of the two channels have
• Connect the input capacitor(s), C
to be located within a short distance from (preferably
<1cm) each other with a common drain connection at
C
two channels as it can result in a large resonant loop.
MOSFETs. This capacitor provides the MOSFET transient
spike current. Connect the drain of the top MOSFET as
IN
. Do not attempt to split the input decoupling for the
R
IN
V
IN
C
IN
BOLD LINES INDICATE
HIGH SWITCHING
CURRENT. KEEP LINES
TO A MINIMUM LENGTH.
IN
, close to the power
Figure 15. Branch Current Waveforms
SW2
SW1
close as possible to the (+) plate of the ceramic portion
of input capacitors C
tom MOSFET as close as possible to the (–) terminal
of the same ceramic C
capacitor(s) bypass the high di/dt current locally, and
both top and bottom MOSFET should have short PCB
trace lengths to minimize high frequency EMI and
prevent MOSFET voltage stress from inductive ringing.
L2
L1
R
R
SENSE2
SENSE1
C
C
OUT2
OUT1
V
V
OUT2
OUT1
IN
. Connect the source of the bot-
IN
capacitor(s). These ceramic
3838 F15
LTC3838
R
R
L2
L1
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