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LTM4639 数据表(PDF) 21 Page - Linear Technology

部件名 LTM4639
功能描述  Ultrathin, Triple Output, Step-Down 關Module Regulator for DDR-QDR4 Memory
Download  28 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTM4639 数据表(HTML) 21 Page - Linear Technology

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LTM4632
21
4632fc
For more information www.linear.com/LTM4632
APPLICATIONS INFORMATION
SAFETY CONSIDERATIONS
The LTM4632 modules do not provide galvanic isolation
from VIN to VOUT. There is no internal fuse. If required,
a slow blow fuse with a rating twice the maximum input
current needs to be provided to protect each unit from
catastrophic failure. The device does support thermal
shutdown and over current protection.
LAYOUT CHECKLIST/EXAMPLE
The high integration of LTM4632 makes the PCB board
layout very simple and easy. However, to optimize its
electrical and thermal performance, some layout consid-
erations are still necessary.
• Use large PCB copper areas for high current paths,
including VIN, GND, VOUT1 and VOUT2. It helps to mini-
mize the PCB conduction loss and thermal stress.
• Place high frequency ceramic input and output capac-
itors next to the VIN, PGND and VOUT pins to minimize
high frequency noise.
• Place a dedicated power ground layer underneath the
unit.
• To minimize the via conduction loss and reduce mod-
ule thermal stress, use multiple vias for interconnec-
tion between top layer and other power layers.
• Do not put via directly on the pad, unless they are
capped or plated over.
• Use a separated SGND ground copper area for com-
ponents connected to signal pins. Connect the SGND
to GND underneath the unit.
• For parallel modules, tie the VOUT, VFB, and COMP
pins together. Use an internal layer to closely con-
nect these pins together. The TRACK pin can be tied
a common capacitor for regulator soft-start.
• Bring out test points on the signal pins for monitoring.
Figure 18 gives a good example of the recommended
layout.
GND
GND
COUT
COUT
CIN
CIN
VIN
VIN
Figure 18. Recommend PCB Layout


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