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ST1S40 Datasheet(PDF) 19 Page - STMicroelectronics

Part # ST1S40
Description  3 A DC step-down switching regulator
PDF  29 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST1S40 Datasheet(HTML) 19 Page - STMicroelectronics

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DocID17928 Rev 5
19/29
ST1S40
Application information
29
Figure 8. PCB layout guidelines
Input cap as close as possible
to VINSW pin
Star center for common ground
Short FB trace
VINA derived from Cin
To avoid dynamic voltage drop
Between VINA and VINSW
Short high switching
current loop
Via to connect the thermal pad
To bottom or inner ground plane



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