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LM3243 数据表(PDF) 21 Page - Texas Instruments

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部件名 LM3243
功能描述  High-Current Step-Down Converter
Download  32 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

LM3243 数据表(HTML) 21 Page - Texas Instruments

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+
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LM3243
VBATT_PA
VIN DC-DC
VBATT
+
*
*Proper decoupling on VBATT_PA
is strongly recommended.
*
Star connection at VBATT
VIN
+
-
VBATT_PA
LM3243
www.ti.com
SNVS782C – OCTOBER 2010 – REVISED AUGUST 2015
Layout Guidelines (continued)
fewer bypass capacitors.
VBATT Star Connection: It is critically important to use a ‘Star’ connection from VBATT supply to LM3243 PVIN
and from VBATT to PA modules as implementing a ‘daisy chain’ supply connection may add noise to the PA
output.
Figure 26. VBATT Star Connection on VIN And VBATT_PA
10.1.2 Manufacturing Considerations
The LM3243 package employs a 16-pin (4 × 4) array of 0.24-mm solder balls, with a 0.4-mm pad pitch. A few
simple design rules will go a long way to ensuring a good layout.
Pad size should be 0.225 ± 0.02 mm. Solder mask opening should be 0.325 ± 0.02 mm.
As a thermal relief, connect to each pad with 9 mil wide, 6 mil long traces and incrementally increase each
trace to its optimal width. Symmetry is important to ensure the solder bumps re-flow evenly. Refer to TI
Application Note AN-1112 DSBGA Wafer Level Chip Scale Package (SNVA009).
10.2 Layout Example
Figure 27. Simplified LM3243 RF Evaluation Board Schematic
Copyright © 2010–2015, Texas Instruments Incorporated
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