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參數資料
| 型號： | LM3205SD-2 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers |
| 中文描述： | 1.2 A SWITCHING REGULATOR, 2300 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | LLP-10 |
| 文件頁數： | 16/18頁 |
| 文件大?。?/td> | 1285K |
| 代理商： | LM3205SD-2 |
Board Layout Considerations
(Continued)
3.
Above layout patterns should be placed on the compo-
nent side of the PCB to minimize parasitic inductance
and resistance due to via-holes. It may be a good idea
that the SW to L1 path is routed between C2(+) and
C2(-) land patterns. If vias are used in these large cur-
rent paths, multiple via-holes should be used if possible.
Connect C1(-), C2(-) and PGND with wide GND pattern.
This pattern should be short, so C1(-), C2(-), and PGND
should be as close as possible. Then connect to a PCB
common GND pattern with as many via-holes as pos-
sible.
4.
5.
SGND should not connect directly to PGND. Connecting
these pins under the device should be avoided. (If pos-
sible, connect SGND to the common port of C1(-), C2(-)
and PGND.)
V
should not be connected directly to PV
. Connect-
ing these pins under the device should be avoided. It is
good idea to connect V
DD
to the C1(+) to avoid switching
noise injection to the V
DD
line.
FB line should be protected from noise. It is a good idea
to use an inner GND layer (if available) as a shield.
6.
7.
BOARD LAYOUT FLOW (LLP)
1.
Minimize C1, PV
, and PGND loop. These traces
should be as wide and short as possible. This is most
important.
2.
Minimize L1, C2, SW and PGND loop. These traces also
should be wide and short. This is the second priority.
3.
Above layout patterns should be placed on the compo-
nent side of the PCB to minimize parasitic inductance
and resistance due to via-holes. It may be a good idea
that the SW to L1 path is routed between C2(+) and
C2(-) land patterns. If vias are used in these large cur-
rent paths, multiple via-holes should be used if possible.
4.
Connect C1(-), C2(-) and PGND with wide GND pattern.
This pattern should be short, so C1(-), C2(-), and PGND
should be as close as possible. Then connect to a PCB
common GND pattern with as many via-holes as pos-
sible.
5.
SGND should connect directly to PGND through a single
common via as close to C1 as possible. Connecting
these pins under the LLP device on a different layer
should be avoided.
V
should not be connected directly to PV
. Connect-
ing these pins under the device should be avoided. It is
good idea to connect V
DD
to the C1(+) to avoid switching
noise injection to the V
DD
line.
FB line should be protected from noise. It is a good idea
to use an inner GND layer (if available) as a shield.
Note:
The evaluation board shown in
Figure 5
and
Figure 6
for the LM3205TL/
LM3205SD were designed with these considerations, and it shows
good performance. However some aspects have not been optimized
because of limitations due to evaluation-specific requirements. The
board can be used as a reference, but it is not the best. Please refer
questions to a National representative.
6.
7.
20158032
FIGURE 6. Evaluation Board for LLP
L
www.national.com
16
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| LM3205TL | 650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers |
| LM3205TLX | 650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LM3205SD-2/NOPB | 功能描述:DC/DC 開關控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| LM3205SDX-2 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers |
| LM3205SDX-2/NOPB | 功能描述:DC/DC 開關控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| LM3205TL | 制造商:Texas Instruments 功能描述:Conv DC-DC Single Step Down 2.7V to 5.5V 8-Pin uSMD T/R 制造商:Texas Instruments 功能描述:Adj. Step-Down DC-DC Converter,LM3205TL |
| LM3205TL/NOPB | 功能描述:DC/DC 開關控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
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