Datasheet

LT4256-3
18
42563fa
APPLICATIO S I FOR ATIO
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Figure 18. Recommended Component Placement
Layout Considerations
To achieve accurate current sensing, a Kelvin connection
to the current sense resistor (R5 in typical application
circuit) is recommended. Note that 1oz copper exhibits a
sheet resistance of about 530µΩ/
❏. Small resistances can
cause large errors in high current applications. Noise
immunity will be improved significantly by locating resis-
tor dividers close to the pins with short V
CC
and GND
traces. The minimum trace width for 1oz copper foil is
0.02" per amp to make sure the trace stays at a reasonable
temperature. 0.03" per amp or wider is recommended.
Figure 18 shows a layout that meets these requirements.
C1
42563 F18
V
OUT
V
IN
GND
R8
R7
R5
Q1
D1
R6
R9
R3
R1
D2
R2
LT4256-3