LTC3703EGN Linear Technology, LTC3703EGN Datasheet - Page 29

• Manufacturer Part Number: LTC3703EGN
• Description: IC BUCK/BOOST SYNC ADJ 5A 16SSOP
• Manufacturer: Linear Technology
• Type: Step-Down (Buck), Step-Up (Boost)r

Specifications of LTC3703EGN

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 0.8 ~ 93 V
• Current - Output: 5A
• Frequency - Switching: 100kHz ~ 600kHz
• Voltage - Input: 9.3 ~ 100 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-SSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -

APPLICATIONS INFORMATION
5. Place the small-signal components away from high
6. A separate decoupling capacitor for the supply, V
frequency switching nodes (BOOST, SW, TG, and BG).
In the layout shown in Figure 20, all the small-signal
components have been placed on one side of the IC
and all of the power components have been placed on
the other. This also helps keep the signal ground and
power ground isolated.
is useful with an RC fi lter between the DRV
and V
Connect this capacitor close to the IC, between the
V
capacitor (signal ground) isolated from the ground side
of the DRV
CC
and GND pins and keep the ground side of the V
CC
pin to fi lter any noise injected by the drivers.
CC
capacitor (power ground).
C
R
C2
C2
C
C3
R1
R2
R
C1
C
C1
R
R
C
MAX
SET
SS
Figure 20. LTC3703 Buck Converter Suggested Layout
1
2
3
4
5
6
7
8
MODE/SYNC
f
COMP
FB
I
INV
RUN/SS
GND
SET
MAX
LTC3703
BOOST
BGRTN
DRV
CC
V CC
SW
V
TG
BG
CC
IN
supply
16
15
14
13
12
11
10
9
CC
CC
,
C
X5R
VCC
V
CC
7. For optimum load regulation and true remote sensing,
8. For applications with multiple switching power con-
C
X5R
the top of the output resistor divider should connect
independently to the top of the output capacitor (Kelvin
connection), staying away from any high dV/dt traces.
Place the divider resistors near the LTC3703 in order
to keep the high impedance FB node short.
verters connected to the same input supply, make
sure that the input fi lter capacitor for the LTC3703 is
not shared with other converters. AC input current
from another converter could cause substantial input
voltage ripple, and this could interfere with the opera-
tion of the LTC3703. A few inches of PC trace or wire
(L ≅ 100nH) between C
source V
interference problems.
R
DRVCC
F
D
C
M2
B
M1
B
IN
V
should be suffi cient to prevent input noise
IN
D1
+
C
IN
IN
L1
C
OUT
of the LTC3703 and the actual
+
3703 F18
V
LTC3703
OUT
+
–
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