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参数资料
| 型号： | MIC2099-1YMT TR |
| 厂商： | Micrel Inc |
| 文件页数： | 19/25页 |
| 文件大小： | 0K |
| 描述： | IC DISTRIBUTION SWITCH |
| 标准包装： | 1 |
| 系列： | * |
| 其它名称： | 576-3783-6 |
Micrel, Inc.
I LIMIT vs. I OUT Measured
When in current limit, the switches are designed to act
as a constant-current source to the load. As the load
tries to pull more than the maximum current, V OUT drops
and the input-to-output voltage differential increases. As
the (V IN ? V OUT ) voltage differential increases, the IC
internal temperature also increases. To limit the IC’s
power dissipation, the current limit is reduced as a
function of output voltage.
This folding back of I LIMIT can be generalized by plotting
I LIMIT as a function of V OUT , as shown in Figures 3 and 4.
The slope of V OUT between I OUT = 0V and I OUT = I LIMIT
(where I LIMIT is a normalized 1A) is determined by R ON of
the switch and I LIMIT .
Normalized Output Current
MIC2095/97/98/99
When measuring I OUT 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 5 and
6.
In Figure 5, output current is measured as V OUT is pulled
below V IN , with the test terminating when V OUT is 1V
below V IN . Observe that once I LIMIT is reached I OUT
remains constant throughout the remainder of the test. In
Figure 6 this test is repeated but with (V IN ? V OUT ) is 4V.
1.2
1.0
0.8
0.6
0.4
0.2
vs. Output Voltage (5V)
Figure 5. I OUT in Current Limiting for V OUT = 4V
0
0
1 2 3 4 5
6
OUTPUT VOLTAGE (V)
Figure 3. Normalized Output Current vs. Output Voltage
Normalized Output Current
1.2
1.0
0.8
0.6
0.4
0.2
vs. Output Voltage (2.5V)
Figure 6. I OUT in Current Limiting for V OUT = 1V
Under Voltage Lock Out (UVLO)
The switches have an Under Voltage Lock Out (UVLO)
feature that will shut down the switch in a reproducible
0
0
0.5 1.0 1.5 2.0 2.5
3.0
manner when the input power supply voltage goes too
low. The UVLO circuit disables the output until the
OUTPUT VOLTAGE (V)
Figure 4. Normalized Output Current vs. Output Voltage
supply voltage exceeds the UVLO threshold. Hysteresis
in the UVLO circuit prevents noise and finite circuit
impedance from causing chatter during turn-on and turn-
off. While disable by the UVLO circuit, the output switch
(power MOSFET) is OFF and no circuit functions, such
as FAULT/ or ENABLE, are considered to be valid or
operative.
August 2011
19
M9999-080211-C
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2099-2YMT | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Current-Limiting Power Distribution Switches |
| MIC2099-2YMT TR | 功能描述:电源开关 IC - USB Power Distribution Switch with Programmable Current Limit 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 |
| MIC2099-2YMT-TR | 功能描述:IC DISTRIBUTION SWITCH 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:2.5 V ~ 5.5 V 电压 - 电源（Vcc/Vdd）:不需要 电流 - 输出（最大值）:1.1A 导通电阻（典型值）:170 毫欧 输入类型:非反相 特性:压摆率受控型 故障保护:限流（可调），超温，UVLO 工作温度:-40°C ~ 125°C （TJ） 封装/外壳:6-UFDFN 裸露焊盘 供应商器件封装:6-TDFN（1.6x1.6） 标准包装:1 |
| MIC20XX | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Fixed and Adjustable Current Limiting Power Distribution Switches |
| MIC20XX_1108 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Fixed and Adjustable Current Limiting Power Distribution Switches |
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