參數(shù)資料
型號(hào)： MIC2585-2MBTS TR
廠商： Micrel Inc
文件頁(yè)數(shù)： 26/28頁(yè)
文件大?。?/td> 273K
描述： IC CTRLR HOT SWAP DUAL 24-TSSOP
標(biāo)準(zhǔn)包裝： 2,500
類(lèi)型： 熱交換控制器
應(yīng)用： 通用
內(nèi)部開(kāi)關(guān)： 無(wú)
電源電壓： 1 V ~ 13.2 V
工作溫度： -40°C ~ 85°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 24-TSSOP（0.173"，4.40mm 寬）
供應(yīng)商設(shè)備封裝： 24-TSSOP
包裝： 帶卷 (TR)
其它名稱(chēng)： MIC2585-2MBTSTR
MIC2585-2MBTSTR-ND
MIC2584/2585
Micrel
MIC2584/2585
26
March 2005
PCB Layout Considerations
Because of the low values of the sense resistors used with the
MIC2584/85 controllers, special attention to the layout must
be used in order for the devices circuit breaker function to
operate properly. Specifically, the use of a 4-wire Kelvin
connection to accurately measure the voltage across R
SENSE
is highly recommended. Kelvin sensing is simply a means of
making sure that any voltage drops in the power traces
connecting to the resistors does not get picked up by the
traces themselves. Additionally, these Kelvin connections
should be isolated from all other signal traces to avoid
introducing noise onto these sensitive nodes. Figure 14
illustrates a recommended, multi-layer layout for the R
SENSE
,
Power MOSFET, timer(s), and feedback network connec-
tions. The feedback network resistor values are selected for
a 12V application. Many hot swap applications will require
load currents of several amperes. Therefore, the power (V
CC
and Return) trace widths (W) need to be wide enough to allow
the current to flow while the rise in temperature for a given
copper plate (e.g., 1oz. or 2oz.) is kept to a maximum of
10癈 ~ 25癈. Also, these traces should be as short as
possible in order to minimize the IR drops between the input
and the load. For a starting point, there are many trace width
calculation tools available on the web such as the following
link:
http://www.aracnet.com/cgi-usr/gpatrick/trace.pl
Finally, the use of plated-through vias will be needed to make
circuit connections to power and ground planes when utilizing
multi-layer PC boards.
Via to
GND plane
S
S
S
G
D
D
D
D
**C
GATE
Via to
GND plane
**R
GATE
93.1k
1%
12.4k
1%
*POWER MOSFET
(SO-8)
*SENSE RESISTOR
(2512)
W
Current Flow
to the Load
Current Flow
from the Load
Current Flow
to the Load
DRAWING IS NOT TO SCALE
Similar considerations should be used for Channel 2.
*See Table 5 for part numbers and vendors.
**Optional components.
Trace width (W) guidelines given in "PCB Layout Recommendations" section of the datasheet.
W
W
9
10
11
12
16
15
14
13
Figure 14. Recommended PCB Layout for Sense Resistor, Power MOSFET and Feedback Network
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