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LTC3704 Datasheet(PDF) 23 Page - Linear Technology

Part # LTC3704
Description  Wide Input Range, No RSENSE Positive-to-Negative DC/DC Controller
PDF  28 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3704 Datasheet(HTML) 23 Page - Linear Technology

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23
LTC3704
sn3704 3704fs
APPLICATIO S I FOR ATIO
PC Board Layout Checklist
1. In order to minimize switching noise and improve
output load regulation, the GND pin of the LTC3704
should be connected directly to 1) the negative termi-
nal of the INTVCC decoupling capacitor, 2) the negative
terminal of the output decoupling capacitors, 3) the
source of the power MOSFET or the bottom terminal of
the sense resistor, 4) the negative terminal of the input
capacitor and 5) at least one via to the ground plane
immediately adjacent to Pin 6. The ground trace on the
top layer of the PC board should be as wide and short
as possible to minimize series resistance and induc-
tance.
LTC3704
M1
VIN
3704 F??
VOUT
L1
RT
RC
CC1
R3
CIN
COUT
CVCC
R1
R2
PSEUDO-KELVIN
SIGNAL GROUND
CONNECTION
TRUE REMOTE
OUTPUT SENSING
VIAS TO GROUND
PLANE
R4
PIN 1
COUT
D1
L2
CDC
C3
CC2
1
2
3
4
5
6
12
11
10
9
8
7
Figure 22. LTC3704 Positive-to-Negative Converter Suggested Layout
RUN
ITH
NFB
FREQ
MODE/
SYNC
SENSE
VIN
INTVCC
GATE
GND
LTC3704
R4
10
9
8
7
6
1
2
3
4
5
CVCC
PSEUDO-KELVIN
GROUND CONNECTION
CIN
M1
D1
L1
VIN
GND
3704 F23
COUT
RC
R1
RT
BOLD LINES INDICATE HIGH CURRENT PATHS
R2
CC1
R3
C3
L2
CDC
VOUT
CC2
Figure 23. LTC3704 Positive-to-Negative Converter Layout Diagram



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