- 您现在的位置：买卖IC网 > PDF目录17074 > MIC2090-1YM5 TR (Micrel Inc)IC DISTRIBUTION SW 50MA SOT-23-5 PDF资料下载
参数资料
| 型号： | MIC2090-1YM5 TR |
| 厂商： | Micrel Inc |
| 文件页数： | 16/23页 |
| 文件大小： | 0K |
| 描述： | IC DISTRIBUTION SW 50MA SOT-23-5 |
| 标准包装： | 1 |
| 类型： | 高端开关 |
| 输出数： | 1 |
| Rds（开）： | 1.2 欧姆 |
| 内部开关： | 是 |
| 电流限制： | 75mA |
| 输入电压： | 1.8 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-74A，SOT-753 |
| 供应商设备封装： | SOT-23-5 |
| 包装： | 标准包装 |
| 其它名称： | 576-3890-6 |
Micrel, Inc.
During an overcurrent or short circuit, The FAULT/ signal
asserts after a brief delay period, t D_FAULT/ , in order to
filter out false or transient over-current conditions.
The FAULT/ output is open-drain and must be pulled
HIGH with an external resistor. The FAULT/ signal may
be wire-OR’d with other similar outputs, sharing a single
pull-up resistor.
Power Dissipation and Thermal Shutdown
Thermal shutdown is used to protect the
MIC2090/MIC2091 switch from damage should the die
temperature exceed a safe operating temperature.
Thermal shutdown shuts off the output MOSFET and
asserts the FAULT/ output if the die temperature
reaches the over-temperature threshold, T OVERTEMP .
The switch will automatically resume operation when the
die temperature cools down to 140°C. If resumed
operation results in reheating of the die, another
shutdown cycle will occur and the switch will continue
cycling between ON and OFF states until the reason for
the overcurrent condition has been resolved.
Depending upon the PCB layout, package type, ambient
temperature, etc., hundreds of milliseconds may elapse
MIC2090/MIC2091
may exceed the package and PCB’s ability to cool the
device and the MIC2090/MIC2091 will shut down and
signal a fault condition. Please see the “Fault Output”
description for more details on the FAULT/ output.
After the MIC2090/MIC2091 shuts down, and cools, it
will re-start itself if the enable signal remains true.
n Figure 2, die temperature is plotted against I OUT
assuming a constant ambient temperature of 85°C and a
worst case internal switch on-resistance (R ON ). This plot
is valid for both the MIC2090 and MIC2091.
Die Temperature vs. Output Current
(Ambient Temperature = 85°C)
90
89
88
87
86
85
84
from the time a fault occurs to the time the output
MOSFET will be shut off. This delay is caused because
83
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08
0.09
0.1
of the time it takes for the die to heat after the fault
condition occurs.
Power dissipation depends on several factors such as
the load, PCB layout, ambient temperature, and supply
voltage. Calculation of power dissipation can be
accomplished by Equation 2:
I OUT (A)
Figure 2. Die Temperature vs. I OUT
I LIMIT vs. I OUT Measured (-1 version only)
P D = R DS(ON) × (I OUT )
2
Eq.2
When the MIC2090/MIC2091 is current limiting, it is
designed to act as a constant current source to the load.
As the load tries to pull more than the maximum current,
To relate this to junction temperature, Equation 3 can be
used:
V OUT drops and the input to output voltage differential
increases. When V OUT drops below 1.8V, then the output
switch momentarily turns off to insure the internal
T J = P D × R θ (J-A) + T A
Eq. 3
MOSFET switch is not damaged by a very fast short
circuit event.
Where:
T J = Junction Temperature
T A = Ambient Temperature
R θ (J-A) is the thermal resistance of the package.
In normal operation, excessive switch heating is most
often caused by an output short circuit. If the output is
shorted, when the switch is enabled, the
MIC2090/MIC2091 switch limits the output current to the
maximum value. The heat generated by the power
dissipation of the switch continuously limiting the current
When measuring I OUT in an overcurrent condition, it is
important to remember voltage dependence, otherwise
the measurement data may appear to indicate a problem
when none really exists. This voltage dependence is
illustrated in Figures 3 and 4.
In Figure 3, output current is measured as V OUT is pulled
below V IN , with the test terminating when V OUT is 2.5V
below V IN . Observe that once I LIMIT is reached I OUT
remains constant throughout the remainder of the test.
Figure 4 repeats this test but simulates operation deeper
into an overcurrent condition. When V OUT drops below
1.8V, the switch turns off for a few microseconds before
turning back on.
July 2011
16
M9999-070611-B
相关PDF资料 |
PDF描述 |
|---|---|
| AIMC-0402-39NJ-T | INDUCTOR MULTILAYER 39NH 0402 |
| PCMB103T-R36MS | COIL .36 UH POWER CHOKE 20% SMD |
| RBC06DCMT-S288 | CONN EDGECARD 12POS .100 EXTEND |
| EEM22DTKT | CONN EDGECARD 44POS DIP .156 SLD |
| ESA10DTMN | CONN EDGECARD 20POS R/A .125 SLD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2090-2YM5 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Current Limiting Power Distribution Switches |
| MIC2090-2YM5 TR | 功能描述:电源开关 IC - USB 50mA Current Limiting Power Distribution Switch with Latch-off feature 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 |
| MIC2090-2YM5-TR | 功能描述:IC DISTRIB SWITCH 50MA SOT23-5 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:停产 开关类型:通用 输出数:1 比率 - 输入:输出:1:1 输出配置:高端 输出类型:P 通道 接口:开/关 电压 - 负载:1.8 V ~ 5.5 V 电压 - 电源（Vcc/Vdd）:不需要 电流 - 输出（最大值）:50mA 导通电阻（典型值）:700 毫欧 输入类型:非反相 特性:状态标志 故障保护:限流（固定），超温，反向电流，UVLO 工作温度:-40°C ~ 125°C （TJ） 封装/外壳:SC-74A，SOT-753 供应商器件封装:SOT-23-5 标准包装:1 |
| MIC2091-1YM5 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Current Limiting Power Distribution Switches |
| MIC2091-1YM5 TR | 功能描述:电源开关 IC - USB 100mA Current Limiting 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 |
发布紧急采购，3分钟左右您将得到回复。