LTM4641 Datasheet, PDF (47/64 Pages) Linear Technology – 38V, 10A DC/DC Module Regulator with Advanced Input and Load Protection

LTM4641
APPLICATIONS INFORMATION—SAFETY AND LAYOUT GUIDANCE
• Place all feedback components as close to the module
as possible, giving layout priority first to capacitors
C_FFA, C_FFB, C_CMA, C_CMB and C_DM (if used)—followed
next by R_SET1A, R_SET1B and R_SET2 (if used). See Figure 5
in the Applications Information section and Figure 64
in Appendix D for more details. Maintain differential
routing of the remote-sense lines between the load
and the module. Form a “coaxial cable” structure that
surrounds the remote-sense lines with GND potential
within the PCB, to the extent that layout permits. See
an example of routing the VOUT/GND remote-sense
pin pair in Layer 3 of DC1543.
• To facilitate stuffing verification, and test and debug ac-
tivities, consider routing control signals of the LTM4641
with short traces to localized test points, test pads or
test vias—as PCB layout space permits. Both in-house
and contract manufacturers enjoy gaining electrical
access to all non low impedance (≥10Ω) pins of an IC
or μModule regulator to improve in-circuit test (ICT)
coverage.
Figure 43. Recommended PCB Layout, Figure 45 Circuit. View of the LTM4641 from Top of Package
Figure 44. Recommended PCB Layout, Figure 46 Circuit. View of the LTM4641 from Top of Package
4641f
47