[SI-LIST] 答复: About Power Management IC which can sink current
- From: Zhangkun <zhang_kun@xxxxxxxxxx>
- To: 'Han Li' <jasonleehan@xxxxxxxxx>, 'SI LIST' <si-list@xxxxxxxxxxxxx>
- Date: Wed, 10 Sep 2008 08:36:49 +0800
Hi Han
In the VTT of DDR, the source and sink current is of high frequency, which
is provided by the decoupling capacitor.
Hope this is helpful
Best Regards
Zhangkun
2008.9.10
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-----邮件原件-----
发件人: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
代表 Han Li
发送时间: 2008年9月8日 11:06
收件人: SI LIST
主题: [SI-LIST] About Power Management IC which can sink current
Hi, Gurus,
In DDR termination, Vtt requirements a Power Supply IC that can sink
and source current. Many of these are LDO, some are DC-DC(such as Linear's
LTC3776).
I wondered how does current flow into a DC-DC when in sink mode. (It seems
relatively easier to analyze when an IC is a LDO, but swithing an one). What
is the sink-current path inside an IC. Does it have an inside load which
porvides a path to ground?
Thank you very much.
--
Best Regards
Li Han
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