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参数资料
| 型号： | MIC2548-2BMM TR |
| 厂商： | Micrel Inc |
| 文件页数： | 12/14页 |
| 文件大小： | 0K |
| 描述： | IC SW CURR LIMIT HI SIDE 8-MSOP |
| 标准包装： | 2,500 |
| 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： | 带卷 (TR) |
| 其它名称： | MIC2548-2BMMTR MIC2548-2BMMTR-ND |
Micrel, Inc.
Application Information
Supply Filtering
A 0.1 μ F to 1 μ F bypass capacitor from IN to GND,
located near the MIC2544 and MIC2548, 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.
Input transients must not exceed the absolute maximum
supply voltage (V IN max = 6V) even for a short duration.
Figure 3. Supply Bypassing
Power Dissipation
The device's junction temperature depends on 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:
PD = 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
MIC2544/2548
where:
T j = junction temperature
T A = ambient temperature
θ JA = is the thermal resistance of the package
Transient Overcurrent 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.
Adding an optional series resistor-capacitor (R SET2 ) in
parallel with R SET , as shown in Figure 4, 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 435 ? (510mA), an R SET2 of
88 ? (2.5A) 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 overcurrent flag (FLG).
USB Power Distribution
The MIC2544 is ideal for meeting USB power distribution
requirements. Figure 4 depicts a USB Host application.
RSET should be set to a value providing a current-limit
>500mA.
The accurate current-limit of the MIC2544 will reduce
power supply current requirements. Also, fast reaction to
short circuit faults prevent voltage droop in mobile
PC applications.
Printed Circuit Board Hot-Plug
The MIC2544/48 are ideal inrush current-limiters suitable
for hot-plug applications. Due to the integrated charge
pump, the MIC2544/48 presents a high impedance when
off and slowly becomes a low impedance as it turns on.
This “softstart” feature effectively isolates power supplies
from highly capacitive loads by reducing inrush current
during hot-plug events. Figure 5 shows how the
MIC2544 may be used in a hot-plug application.
Figure 4. USB Host Application
Note : MSOP package option uses pin 5 for ILIM. Pin 4 is not connected (NC). Bold lines indicate 0.1” wide, 1-oz. copper high-current traces.
April 2010
12
M9999-043010
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2548-2YM | 功能描述:电源开关 IC - USB Programmable Current Limit Single High-Side Switch - Lead Free 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 |
| MIC2548-2YM TR | 功能描述:电源开关 IC - USB Programmable Current Limit Single High-Side Switch - Lead Free 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 |
| MIC2548-2YMM | 功能描述:电源开关 IC - USB Programmable Current Limit Single High-Side Switch - Lead Free 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 |
| MIC2548-2YMM TR | 功能描述:电源开关 IC - USB Programmable Current Limit Single High-Side Switch - Lead Free 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 |
| MIC2548A-1YM | 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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