Micrel, Inc.
MIC2593
September 2008
24
M9999-092208
MOSFET and Sense Resistor Selection Guide
Listed in Table 5 below, by Manufacturer and Type
Number, are some of the more popular MOSFET and
resistor types used in PCI hot plug applications.
Although far from comprehensive, this information will
constitute a good starting point for most designs.
Power Supply Decoupling
In general, prudent system design requires that power
supplies used for logic functions should have less than
100mV of noise at frequencies of 100kHz and above. In
particular, the 12V supply should have less than 100mV
of peak-to-peak noise at frequencies of 1MHz or higher.
This is because the 12V supply is the most negative
potential applied to the IC, and is therefore connected to
the device's substrate. All of the subcircuits integrated
onto the silicon chip are hence subjected by capacitive
coupling to any HF noise on the 12V supply. While
individual capacitances are quite low, the amount of
injected energy required to cause a "glitch" can also be
quite low at the internal nodes of high speed logic circuits.
Less obviously, but equally important, is the fact that the
internal charge pump for the 3.3V
AUX
supplies is
somewhat susceptible to noise on the +12V input when
that input is at or near zero volts. The +12V supply should
not carry HF noise in excess of 200mV peak-to-peak with
respect to chip ground when it is in the "off" state.
If either the 12V input, the +12V input, of both supplies
do carry significant HF noise (as can happen when they
are locally derived by a switching converter), the solution
is both small and inexpensive. An LC filter made of a
ferrite bead between the noisy power supply input and the
MIC2593, followed by a "composite capacitor" from the
affected MIC2593 input pin to ground, will suffice for
almost any situation. A good composite capacitor for this
purpose is the parallel combination of a 47礔 tantalum
bulk decoupling capacitor, and one 1礔 and one 0.01礔
ceramic capacitor for high-frequency bypass. A suggested
ferrite bead for such use is Fair-Rite Products Corporation
part number 2743019447 (this is a surface-mountable
part). Similar parts from other vendors or a 0.27礖 air-
core coil can also be used.
Noisy V
IN
To MIC2593
SMT Ferrite Bead
Fair-Rite Products
Type 2743019447
47礔
Tanalum
1礔
Ceramic
10nF
Ceramic
Figure 14. Filter Circuit for Noisy Supplies
(+3.3V and/or 12V)
It is theoretically possible that high-amplitude, HF noise
reflected back into one or both of the MIC2593s 12V
outputs could interfere with proper device operation,
although such noisy loads are unlikely to occur in the real
world. If this becomes an application-specific concern, a
pair of filters similar to that in Figure 14 will provide the
required HF bypassing. The capacitors would be
connected to the MIC2593s 12V output pins, and the
ferrite beads would be placed between the 12V output
pins and the loads.
MOSFET Vendors
Key MOSFET Type(s)
Web Address
Vishay (Siliconix)
Si4430DY ( LittleFoot
?/DIV>
Series)
Si4420DY ( LittleFoot
?/DIV>
Series)
www.siliconix.com
International Rectifier
IRF7413A (SO-8 package part)
Si4420DY (second source to Vishay)
www.irf.com
Fairchild Semiconductor
FDS6644 (SO-8 package part)
FDS6670A (SO-8 package part)
FDS6688 (SO-8 package part)
www.fairchildsemi.com
Resistor Vendors
Sense Resistors
Web Address
Vishay (Dale)
WSL Series
WSL 3637 Series
www.vishay.com/docs/wsl_30100.pdf
IRC
OARS Series
LR Series
(second source to WSL)
irctt.com/pdf_files/OARS.pdf
irctt.com/pdf_files/LRC.pdf
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
MIC2594-2BM TR
IC CTRLR HOT SWAP NEG HV 8-SOIC
MIC2595R-2BM TR
IC CTRLR HOT SWAP NEG HV 14-SOIC
MIC280-7BM6 TR
IC SUPERVISOR THERMAL SOT23-6
MIC2800-GFSYML TR
IC REG TRPL BUCK/LINEAR 16MLF
MIC281-7BM6 TR
IC SUPERVISOR THERMAL SOT23-6
MIC2810-1JGMYML TR
IC REG TRPL BUCK/LINEAR 16MLF
MIC284-2BMM TR
IC SUPERVISOR THERM 2ZONE 8-MSOP
MIC3385-1.5YHL TR
IC REG DL BCK/LINEAR SYNC 14-MLF
相关代理商/技术参数
MIC2593-2YTQ
功能描述:热插拔功率分布 Dual-slot PCI Hot Swap Power Controller w/o IPMI support - Lead Free
RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube
MIC2593-2YTQ TR
功能描述:热插拔功率分布 Dual-slot PCI Hot Swap Power Controller w/o IPMI support - Lead Free
RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube
MIC2594-1BM
功能描述:IC CTRLR HOT SWAP NEG HV 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:100 系列:- 类型:热插拔开关 应用:通用 内部开关:是 电流限制:可调 电源电压:9 V ~ 13.2 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-TDFN-EP（3x3） 包装:管件
MIC2594-1BM TR
功能描述:IC CTRLR HOT SWAP NEG HV 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:100 系列:- 类型:热插拔开关 应用:通用 内部开关:是 电流限制:可调 电源电压:9 V ~ 13.2 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-TDFN-EP（3x3） 包装:管件
MIC2594-1YM
功能描述:热插拔功率分布 Negative Voltage Hot-Swap Controller - Lead Free
RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube
MIC2594-1YM TR
功能描述:热插拔功率分布 Negative Voltage Hot-Swap Controller - Lead Free
RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube
MIC2594-1YM-TR
功能描述:Hot Swap Controller 1 Channel -48V 8-SOIC 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:停产 类型:热交换控制器 通道数:1 内部开关:无 应用:-48V 特性:故障超时，闭锁故障 可编程特性:限流，压摆率，UVLO 电压 - 电源:-80 V ~ -19 V 电流 - 输出（最大值）:- 工作温度:-40°C ~ 85°C 电流 - 电源:3mA 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商器件封装:8-SOIC 功能引脚:DRAIN，OFF，ON，PWRGD 标准包装:1
MIC2594-2BM
功能描述:IC CTRLR HOT SWAP NEG HV 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:100 系列:- 类型:热插拔开关 应用:通用 内部开关:是 电流限制:可调 电源电压:9 V ~ 13.2 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-TDFN-EP（3x3） 包装:管件