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| 型号： | MIC2074-2YM |
| 厂商： | Micrel Inc |
| 文件页数： | 12/16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： | 576-3443-5 |
Micrel, Inc.
MIC2073/2074
Power Dissipation
The device’s junction temperature depends upon several
factors such as the load, PCB layout, ambient
temperature, and package type. Equations that can be
used to calculate power dissipation of each channel and
junction temperature are found below:
?
Short-Circuit Applied to Enabled Output
When a heavy load or short-circuit is applied to an
enabled switch, a large transient current may flow
until the current-limit circuitry responds. Once this
occurs, the device limits current to less than the
short-circuit current limit specification.
P D = R DS(on) × I OUT2
Total power dissipation of the device will be the
summation of P D for both channels. To relate this to
junction temperature, the following equation can be
used:
T J = P D × θ JA + T A
where:
T J = junction temperature
T A = ambient temperature
θ JA = is the thermal resistance of the package
Current Sensing and Limiting
The current-limit threshold is preset internally. The
preset level prevents damage to the device and external
load but still allows a minimum current of 500mA to be
delivered to the load.
The current-limit circuit senses a portion of the output
MOSFET switch current. The current-sense resistor
shown in the block diagram is a virtual resistor and has
no voltage drop. The reaction to an overcurrent condition
varies with three scenarios:
? Switch Enabled into Short-Circuit
? Current-Limit Response - Ramped Load
The MIC2073/2074 current-limit profile exhibits a
small foldback effect of about 200mA. Once this
current-limit threshold is exceeded the device
switches into a constant current mode. It is important
to note that the device will supply current up to the
current-limit threshold.
Fault Flag
The FLG signal is an N-channel open-drain MOSFET
output. FLG is asserted (active-low) when either an
overcurrent or thermal shutdown condition occurs. In the
case of an overcurrent condition, FLG will be asserted
only after the flag response delay time, t D , has elapsed.
This ensures that FLG is asserted only upon valid
overcurrent conditions and that erroneous error reporting
is eliminated. For example, false overcurrent conditions
can occur during hot plug events when a highly
capacitive load is connected and causes a high transient
inrush current that exceeds the current-limit threshold for
up to 1ms. The FLG response delay time t D is typically
3ms.
Undervoltage Lockout
Undervoltage lockout (UVLO) prevents the output
If a switch is enabled into a heavy load or short-
MOSFET from turning on until V IN
exceeds
circuit, the switch immediately enters into a constant-
current mode, reducing the output voltage. The FLG
signal is asserted indicating an overcurrent
condition.
approximately 2.5V. Undervoltage detection functions
only when the switch is enabled.
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 1. MIC2074-2 Fault Timing: Output Reset by Removing Load
January 2009
12
M9999-011209
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2074-2YM 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 |
| MIC2075 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Single-Channel Power Distribution Switch MM8? |
| MIC2075-1BM | 功能描述:IC DISTRIBUTION SW SGL 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 电源分配开关 系列:MM8™ 特色产品:XRP252 Switches 标准包装:1 系列:- 类型:高端开关 输出数:2 Rds（开）:140 毫欧 内部开关:是 电流限制:1.15A 输入电压:1.75 V ~ 5.5 V 工作温度:-40°C ~ 85°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（3x3） 包装:Digi-Reel® 其它名称:1016-1691-6 |
| MIC2075-1BM TR | 功能描述:IC DISTRIBUTION SW SGL 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 电源分配开关 系列:MM8™ 特色产品:XRP252 Switches 标准包装:1 系列:- 类型:高端开关 输出数:2 Rds（开）:140 毫欧 内部开关:是 电流限制:1.15A 输入电压:1.75 V ~ 5.5 V 工作温度:-40°C ~ 85°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（3x3） 包装:Digi-Reel® 其它名称:1016-1691-6 |
| MIC2075-1BMM | 功能描述:IC DISTRIBUTION SW SGL 8-MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 电源分配开关 系列:MM8™ 特色产品:XRP252 Switches 标准包装:1 系列:- 类型:高端开关 输出数:2 Rds（开）:140 毫欧 内部开关:是 电流限制:1.15A 输入电压:1.75 V ~ 5.5 V 工作温度:-40°C ~ 85°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（3x3） 包装:Digi-Reel® 其它名称:1016-1691-6 |
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