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參數(shù)資料
| 型號： | LM3668SD-3.3/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2.05 A DUAL SWITCHING CONTROLLER, 2500 kHz SWITCHING FREQ-MAX, DSO12 |
| 封裝： | ROHS COMPLIANT, LLP-12 |
| 文件頁數(shù)： | 5/20頁 |
| 文件大?。?/td> | 2497K |
| 代理商： | LM3668SD-3.3/NOPB |
Layout Considerations
As for any high frequency switcher, it is important to place the
external components as close as possible to the IC to maxi-
mize device performance. Below are some layout recommen-
dations:
1) Place input filter and output filter capacitors close to the IC
to minimize copper trace resistance which will directly effect
the overall ripple voltage.
2) Route noise sensitive trace away from noisy power com-
ponents. Separate power GND ( Noisy GND) and Signal GND
( quiet GND) and star GND them at a single point on the PCB
prefereably close to the device GND pin.
3) Connect the ground pins and filter capacitors together via
a ground plane to prevent switching current circulating
through the ground plane. Additional layout consideration re-
garding the LLP package can be found in Application AN1187
13
www.national.com
LM3668
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