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| 型号： | MIC2073-2YM |
| 厂商： | Micrel Inc |
| 文件页数： | 13/16页 |
| 文件大小： | 0K |
| 描述： | IC PWR DISTRIBUTION SW 2CH 8SOIC |
| 标准包装： | 95 |
| 类型： | 高端开关 |
| 输出数： | 2 |
| Rds（开）： | 170 毫欧 |
| 内部开关： | 是 |
| 电流限制： | 700mA |
| 输入电压： | 2.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
| 产品目录页面： | 1114 (CN2011-ZH PDF) |
| 其它名称： | 576-3441-5 |
Micrel, Inc.
MIC2073/2074
V EN
V OUT
I LIMIT
I LOAD
I OUT
V FLG
3ms typ.
delay
Short-Circuit Fault
Thermal
Shutdown
Reached
Load and Fault Removed
(Output Reset)
Figure 2. MIC2073-2 Fault Timing
Application Information
Supply Filtering
A 0.1μF to 1μF bypass capacitor positioned close to V IN
and GND of the device is strongly recommended to
control supply transients. Without a bypass capacitor, an
output short may cause sufficient ringing on the input
(from supply lead inductance) to damage internal control
circuitry.
Printed Circuit Board Hot-Plug
The MIC2073/2074 are ideal inrush current-limiters for
hot plug applications. Due to their integrated charge
pumps, the MIC2073/2074 present a high impedance
when off and slowly becomes a low impedance as their
integrated charge pumps turn on. This “soft-start” feature
effectively isolates power supplies from highly capacitive
loads by reducing inrush current. Figure 3 shows how
the MIC2074 may be used in a card hot-plug application.
In cases of extremely large capacitive loads (>400μF),
the length of the transient due to inrush current may
exceed the delay provided by the integrated filter. Since
this inrush current exceeds the current-limit delay
specification, FLG will be asserted during this time. To
prevent the logic controller from responding to FLG
being asserted, an external RC filter, as shown in Figure
4, can be used to filter out transient FLG assertion. The
value of the RC time constant should be selected to
match the length of the transient, less t D(min) of the
MIC2073/2074.
Universal Serial Bus (USB) Power Distribution
The MIC2073/2074 are ideally suited for USB (Universal
Serial Bus) power distribution applications. The USB
specification defines power distribution for USB host
systems such as PCs and USB hubs. Hubs can either
be self-powered or bus-powered (that is, powered from
the bus). Figure 5 shows a typical USB Host application
that may be suited for mobile PC applications employing
USB. The requirement for USB host systems is that the
port must supply a minimum of 500mA at an output
voltage of 5V ±5%. In addition, the output power
delivered must be limited to below 25VA. Upon an
overcurrent condition, the host must also be notified. To
support hot-plug events, the hub must have a minimum
of 120μF of bulk capacitance, preferably low ESR
electrolytic or tantalum. Please refer to Application Note
17 for more details on designing compliant USB hub and
host systems.
For bus-powered hubs, USB requires that each
downstream port be switched on or off under control by
the host. Up to four downstream ports each capable of
supplying 100mA at 4.4V minimum are allowed. In
addition, to reduce voltage droop on the upstream V BUS ,
soft-start is necessary. Although the hub can consume
up to 500mA from the upstream bus, the hub must
consume only 100mA max at start-up, until it
enumerates with the host prior to requesting more
power. The same requirements apply for bus-powered
peripherals that have no downstream ports. Figure 6
shows a bus-powered hub.
January 2009
13
M9999-011209
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2073-2YM TR | 功能描述:电源开关 IC - USB Dual-Channel Power Distribution Switch RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| MIC2074 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Dual-Channel Power Distribution Switch |
| MIC2074-1YM | 功能描述:电源开关 IC - USB Dual-Channel Power Distribution Switch RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| MIC2074-1YM TR | 功能描述:电源开关 IC - USB Dual-Channel Power Distribution Switch RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| MIC2074-2YM | 功能描述:电源开关 IC - USB Dual-Channel Power Distribution Switch RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
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