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| 型号： | MIC2544A-1YM |
| 厂商： | Micrel Inc |
| 文件页数： | 15/19页 |
| 文件大小： | 0K |
| 描述： | IC SW CURR LIMIT HI SIDE 8SOIC |
| 特色产品： | Programmable Current Limit High-Side Switch |
| 标准包装： | 95 |
| 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-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
| 其它名称： | 576-3604-5 |
Micrel, Inc.
Setting I LIMIT
The MIC2544A/2548A’s current limit is user
programmable and controlled by a resistor connected
between the I LIMIT pin and ground. The value of this
resistor is determined by the following equation:
MIC2544A/2548A
Giving one a maximum I LIMIT variation over-temperature
of:
I LIMIT_MIN I LIMIT_TYP I LIMIT_MAX
0.79A (-21%) 1.0A 1.19A (+19%)
I LIMIT =
CurrentLim itFactor(CLF)
R SET
or
I_OUT
R_SET
I_OUT_Min
I_OUT_Max
R SET =
CurrentLim itFactor(V )
I LIMIT (A)
0.2
0.3
0.4
1150
767
575
0.140
0.210
0.280
0.260
0.390
0.520
For example: Set I LIMIT = 1.0A
Looking in the Electrical specifications we will find CLF
at I LIMIT = 1 A.
0.5
0.6
0.7
0.8
460
383
329
288
0.350
0.480
0.560
0.640
0.650
0.720
0.840
0.960
Min
184
Typ
230
Max
276
Units
V
0.9
1
256
230
0.720
0.800
1.080
1.200
Table 1. CLF at I LIMIT = 1A
For the sake of this example, we will say the typical
value of CLF at an I OUT of 1A is 230V. Applying the
equation above:
1.1
1.2
1.3
1.4
209
192
177
164
0.880
0.960
1.040
1.120
1.320
1.440
1.560
1.680
R SET ( Ω ) =
230V
1.0A
= 230 Ω
1.5
153
1.200
1.800
I LIMIT_MIN =
= 0 . 79 A
R SET = 232 ?
(the closest standard 1% value)
Designers should be aware that variations in the
measured I LIMIT for a given R SET resistor, will occur
because of small differences between individual ICs
(inherent in silicon processing) resulting in a spread of
I LIMIT values. In the example above a typical value of CLF
was used to calculate R SET . One can determine I LIMIT ’s
spread by using the minimum and maximum values of
CLF and the calculated value of R SET .
184V
232 Ω
Table 2. MIC2544A/2548A R SET Table
Short-Circuit Protection
In the event of a short circuit, the output current will fold
back to approximately 70% of the short-circuit current-
limit.
Fault Flag
FLG is an N-channel, open-drain MOSFET output. The
fault flag is active (low) for current-limit or thermal
shutdown conditions. The flag output MOSFET is
capable of sinking a 10mA load to typically 100mV
I LIMIT _ MAX =
April 2010
276 V
232 Ω
= 1 . 19 A
15
above ground. The FLG response delay time t D is
typically 5μs.
M9999-043010
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2544A-1YM 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-1YMM | 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-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 |
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