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| 型号： | MIC2544A-1YMM |
| 厂商： | Micrel Inc |
| 文件页数： | 16/19页 |
| 文件大小： | 0K |
| 描述： | IC SW CURR LIMIT HI SIDE 8MSOP |
| 特色产品： | Programmable Current Limit High-Side Switch |
| 标准包装： | 100 |
| 类型： | 高端 |
| 输入类型： | 非反相 |
| 输出数： | 1 |
| 导通状态电阻： | 80 毫欧 |
| 电流 - 峰值输出： | 1.5A |
| 电源电压： | 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-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 管件 |
| 其它名称： | 576-3605-5 |
Micrel, Inc.
Application Information
Supply Filtering
A minimum 1 μ F bypass capacitor from IN-to-GND,
located near the MIC2544A and MIC2548A, 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. An additional 22μF
input capacitor placed close to the IC is required if a bulk
input capacitor is further than 3 inches away from the IC.
MIC2544A/2548A
Input transients
must not exceed
the absolute
maximum supply voltage (V IN max = 6V) even for a short
duration.
Figure 4. Flag Glitch with C OUT = 120μF
Adding an optional series resistor-capacitor (R SET2 ), in
parallel with R SET , and as shown in Figure 8, allows the
transient current-limit to be set to a different value than
steady-state. A typical USB hot-plug inrush is 2A to 3A
for 10 μ s to 20 μ s. If R SET is 309 ? (525mA), an R SET2 of
100 ? (2.3A) and C SET of 1 μ F (RC = 100 μ s) allows
transient surge of 3A to pass for 100 μ s without tripping
the over current flag (FLG), as shown in Figure 5.
Figure 3. Supply Bypassing
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 and junction
temperature are found below.
Calculation of power dissipation can be accomplished by
the following equation:
P D = R DS(on) × (I OUT ) 2
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
Figure 5. ILIMIT Filter with C OUT = 120μF
Figure 6 circuit can also be used to filter out transient
FLG assertion. The value of the RC time constant should
be selected to match the length of transient. Figure 7
shows the FLAG pin waveform due to the inrush of
current surge.
T A = ambient temperature
θ JA = is the thermal resistance of the package
Transient Over Current Filter
The inrush current from the connection of a heavy
capacitive load may cause the fault flag to fall for 10 μ s to
200 μ s while the switch is in a constant-current mode,
charging the capacitance, as shown in Figure 4.
Figure 6. Flag Filter Circuit
April 2010
16
M9999-043010
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相关代理商/技术参数 |
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| MIC2544A-1YMM TR | 功能描述:电源开关 IC - USB Programmable Current Limit High-Side 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 |
| MIC2544A-2YM | 功能描述:电源开关 IC - USB Programmable Current Limit High-Side 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 |
| MIC2544A-2YM TR | 功能描述:电源开关 IC - USB Programmable Current Limit High-Side 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 |
| MIC2544A-2YMM | 功能描述:电源开关 IC - USB Programmable Current Limit High-Side 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 |
| MIC2544A-2YMM TR | 功能描述:电源开关 IC - USB Programmable Current Limit High-Side 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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