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LM5145 датащи(PDF) 49 Page - Texas Instruments

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номер детали LM5145
подробное описание детали  LM5145-Q1 Automotive 75-V Synchronous Buck DC/DC Controller With Wide Duty Cycle Range
PDF  62 Pages
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
Logo TI - Texas Instruments

LM5145 датащи(HTML) 49 Page - Texas Instruments

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11.2 Layout Example
Figure 11-2 shows an example PCB layout based on the LM5146-Q1-EVM12V design. The power component
connections are made on the top layer with wide, copper-filled polygon areas. The SW connection from the
power MOSFETs to the inductor is purposely kept at minimum area to reduce radiated EMI. A power ground
plane is placed on layer 2 with 6 mil (0.15 mm) spacing to the top layer, see Figure 11-3. As a result, the buck
regulator hot loop has a small effective area based on this tightly-coupled GND plane directly underneath the
MOSFETs.
The LM5145-Q1 controller is located close to the gate terminals of the MOSFETs such that the gate drive traces
are routed short and direct. Refer to the LM5146-Q1-EVM12V Evaluation Module User's Guide for more detail.
Inductor
High-side
MOSFET
VIN
Top Layer Copper
Legend
Output Capacitor
Low-side
MOSFET
VOUT
PGND
Input
Capacitors
Layer 2 GND Plane
Top Solder
Output
Capacitor
SW
PGND
VCC
LO
HO
SW
FB
ILIM
S
G
S
G
Copper island
connected to
AGND pin
Locate controller close
to the power stage
Use paralleled 0603 input capacitors close to
the FETs for VIN to PGND decoupling
Place PGND vias close to the
source of the low-side FET
Keep SW copper
area small
Figure 11-2. LM5145-Q1 Controller PCB Layout (Viewed From Top)
Q2
Q1
Cin1-4
SW
VIN
GND
GND
0.3mm
vias
L1
L2
L3
L4
Tightly-coupled return path
minimizes power loop impedance
0.15mm
Note
See the Improve High-current DC/DC Regulator Performance for Free with Optimized Power Stage
Layout application report for more detail.
Figure 11-3. PCB Stack-up Diagram With Low L1-L2 Intra-layer Spacing
www.ti.com
LM5145-Q1
SNVSBU9 – JUNE 2021
Copyright © 2021 Texas Instruments Incorporated
Submit Document Feedback
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Product Folder Links: LM5145-Q1



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