参数资料
| 型号： | MIC5254-SJYMM TR |
| 厂商： | Micrel Inc |
| 文件页数： | 10/11页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 3.3/2.5V .15A 10-MSOP |
| 标准包装： | 2,500 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 3.3V，2.5V |
| 输入电压： | 2.7 V ~ 6 V |
| 电压 - 压降（标准）： | 0.135V @ 150mA，- |
| 稳压器数量： | 2 |
| 电流 - 输出： | 150mA |
| 电流 - 限制（最小）： | 160mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-MSOP |
| 包装： | 带卷 (TR) |
| 其它名称： | MIC5254-SJYMMTR MIC5254-SJYMMTR-ND |
Micrel, Inc.
125°C and T A is the ambient operating temperature of
the die. θ JA is layout dependent. Table 1 shows the
typical thermal resistance for a minimum footprint layout
for the MIC5254.
MIC5254
For the application mentioned above, if regulator 1 is
sourcing 150mA, it contributes the following to the
overall power dissipation:
P D(reg2) = (V IN – V OUT ) I OUT + V IN × I GND
Package
MSOP-10
θ JA at Recommended
Minimum Footprint
200°C
P D(reg1) = (4.2V – 3.3V)150mA + 4.2V × 100μA
P D(reg1) = 135.5mW
Since the total power dissipation allowable is 325mW,
P D(max) = ?
? 125 ° C - 60 ° C ?
Table 1. Thermal Resistance
The actual power dissipation of each regulator output
can be calculated using the following simple equation:
P D = (V IN – V OUT ) I OUT + V IN × I GND
Each regulator contributes power dissipation to the
overall power dissipation of the package.
P D(total) = P D(reg1) + P D(reg2)
Each output is rated for 150mA of output current, but the
application may limit the amount of output current based
on the total power dissipation and the ambient
temperature. A typical application may call for one 3.3V
output and one 2.5V output from a single Li-Ion battery
input. This input can be as high as 4.2V.
When operating at high ambient temperatures, the
output current may be limited. When operating at an
ambient of 60°C, the maximum power dissipation of the
package is calculated as follows:
?
? 200 ° C/W ?
P D = 325mW
the maximum power dissipation of the second regulator
is limited to:
P D(max) = P D(reg1) + P D(reg2) )
325mW = 135.5mW + P D(reg2)
P D(reg2) = 189.5mW
The maximum output current of the second regulator can
be calculated using the same equations but solving for
the output current (ground current is constant over load
and simplifies the equation):
P D(reg2) = (V IN – V OUT ) I OUT + V IN × I GND
189.5mW = (4.2V – 2.5V) I OUT + 4.2V × 100μA
I OUT = 111.2mA
The second output is limited to 110mA due to the total
power dissipation of the system when operating at 60°C
ambient temperature.
December 2007
10
M9999-121107
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC5255 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:150mA Low Noise UCap CMOS LDO |
| MIC5255_06 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:150mA Low Noise μCap CMOS LDO |
| MIC5255-2.5BD5 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MIC5255-2.5BD5 TR | 功能描述:IC REG LDO 2.5V .15A TSOT23-5 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:500 系列:- 稳压器拓扑结构:正，固定式 输出电压:12V 输入电压:14.5 V ~ 35 V 电压 - 压降（标准）:- 稳压器数量:1 电流 - 输出:500mA 电流 - 限制（最小）:- 工作温度:-40°C ~ 125°C 安装类型:通孔 封装/外壳:TO-205AD，TO-39-3 金属罐 供应商设备封装:TO-39 包装:散装 其它名称:*LM78M12CH*LM78M12CH/NOPBLM78M12CH |
| MIC5255-2.5BM5 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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