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参数资料
| 型号： | MIC2549A-1BM TR |
| 厂商： | Micrel Inc |
| 文件页数： | 14/18页 |
| 文件大小： | 0K |
| 描述： | IC SW CURR LIMIT HI SIDE 8-SOP |
| 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： | 35 毫欧 |
| 电流 - 峰值输出： | 3A |
| 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-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
| 其它名称： | MIC2549A-1BMTR MIC2549A-1BMTR-ND |
Micrel, Inc.
Application Information
Supply Filtering
A 0.1μF to 1μF bypass capacitor from IN to GND,
located near the MIC2545A and MIC2549A, 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:
P D = R DS(ON) × (I OUT ) 2
MIC2545A/2549A
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 = 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 10μs to
200μs while the switch is in a constant-current mode,
charging the capacitance. Adding an optional series
resistor-capacitor (R SET2 ) in parallel with RSET, 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 10μs to 20μs. If R SET is
435 ? (530mA), an R SET2 of 88 ? (2.5A) and C SET of 1μF
(RC ≈ 90μs) allows transient surge of 3A to pass for
90μs without tripping the overcurrent flag (FLG).
USB Power Dissipations
The MIC2545A is ideal for meeting USB power
distribution requirements. Figure 7 depicts a USB Host
application. R SET should be set to a value providing a
current-limit >500mA. The accurate current-limit of the
MIC2545A 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 MIC2545A/49A is an ideal inrush current-limiter
suitable for hot-plug applications. Due to the integrated
charge pump, the MIC2545A/49A presents a high
impedance when off and slowly becomes a low
impedance as it turns on. This “soft start” feature
effectively isolates power supplies from highly-capacitive
loads by reducing inrush current during hot-plug events.
Figure 5 shows how the MIC2545A may be used in a
hot-plug application.
June 2011
14
M9999-062711-A
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2549A-1BN | 功能描述:IC SW CURR LIMIT HI SIDE 8-DIP RoHS:否 类别:集成电路 (IC) >> PMIC - MOSFET，电桥驱动器 - 内部开关 系列:- 标准包装:1 系列:- 类型:高端 输入类型:非反相 输出数:1 导通状态电阻:85 毫欧 电流 - 输出 / 通道:2A 电流 - 峰值输出:6A 电源电压:1.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:4-UFDFN 裸露焊盘，4-TMLF? 供应商设备封装:4-TMLF?（1.2x1.6） 包装:剪切带 (CT) 其它名称:576-1574-1 |
| MIC2549A-1BTS | 功能描述:IC SW CURR LIMIT HI SIDE 14TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - MOSFET，电桥驱动器 - 内部开关 系列:- 标准包装:1 系列:- 类型:高端 输入类型:非反相 输出数:1 导通状态电阻:85 毫欧 电流 - 输出 / 通道:2A 电流 - 峰值输出:6A 电源电压:1.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:4-UFDFN 裸露焊盘，4-TMLF? 供应商设备封装:4-TMLF?（1.2x1.6） 包装:剪切带 (CT) 其它名称:576-1574-1 |
| MIC2549A-1BTS TR | 功能描述:IC SW CURR LIMIT HI SIDE 14TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - MOSFET，电桥驱动器 - 内部开关 系列:- 标准包装:1 系列:- 类型:高端 输入类型:非反相 输出数:1 导通状态电阻:85 毫欧 电流 - 输出 / 通道:2A 电流 - 峰值输出:6A 电源电压:1.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:4-UFDFN 裸露焊盘，4-TMLF? 供应商设备封装:4-TMLF?（1.2x1.6） 包装:剪切带 (CT) 其它名称:576-1574-1 |
| MIC2549A-1YM | 功能描述:电源开关 IC - USB Programmable Current Limit High-Side Switch with Over-Temperature Latch (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 |
| MIC2549A-1YM TR | 功能描述:电源开关 IC - USB Programmable Current Limit High-Side Switch with Over-Temperature Latch (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 |
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