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参数资料
| 型号： | MIC5239BMM TR |
| 厂商： | Micrel Inc |
| 文件页数： | 11/14页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ .5A 8-MSOP |
| 标准包装： | 2,500 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 1.24 V ~ 20 V |
| 输入电压： | 2.3 V ~ 30 V |
| 电压 - 压降（标准）： | 0.35V @ 500mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 500mA |
| 工作温度： | -40°C ~ 125°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： | MIC5239BMMTR MIC5239BMMTR-ND |
Micrel
? T = T J (max) – T A (max)
T J (max) = 125°C
T A (max) = maximum ambient operating
temperature
For example, the maximum ambient temperature is
50°C, the ? T is determined as follows:
? T = 125°C – 50°C
? T = 75°C
Using Figure 6, the minimum amount of required copper
can be determined based on the required power
dissipation. Power dissipation in a linear regulator is
calculated as follows:
P D = (V IN – V OUT ) I OUT + V IN × ? I GND
If we use a 3V output device and a 28V input at
moderate output current of 25mA, then our power
dissipation is as follows:
P D = (28V – 3V) × 25mA + 28V 250μA
P D = 625mW + 7mW
P D = 632mW
From Figure 6, the minimum amount of copper required
to operate this application at a ? T of 75°C is 110mm 2 .
Quick Method
Determine the power dissipation requirements for the
design along with the maximum ambient temperature at
which the device will be operated. Refer to Figure 7,
which shows safe operating curves for three different
ambient temperatures: 25°C, 50°C and 85°C. From
these curves, the minimum amount of copper can be
determined by knowing the maximum power dissipation
required. If the maximum ambient temperature is 50°C
and the power dissipation is as above, 639mW, the
curve in Figure 7 shows that the required area of copper
is 110mm 2 .
The θ JA of this package is ideally 80°C/W, but it will vary
depending upon the availability of copper ground plane
to which it is attached.
Figure 7. Copper Area vs. Power-MSOP
Power Dissipation (T A )
MIC5239
Figure 8. Copper Area vs. Power-SOIC
Power Dissipation ( ? T JA )
Figure 9. Copper Area vs. Power-SOIC
Power Dissipation (T A )
The same method of determining the heatsink area used
for the power MSOP-8 can be applied directly to the
power SOIC-8. The same two curves showing power
dissipation versus copper area are reproduced for the
power SOIC-8 and they can be applied identically.
Power SOIC-8 Thermal Characteristics
The power SOIC-8 package follows the same idea as
the power MSOP-8 package, using four ground leads
with the die attach paddle to create a single-piece
electrical and thermal conductor, reducing thermal
resistance and increasing power dissipation capability.
Quick Method
Determine the power dissipation requirements for the
design along with the maximum ambient temperature at
which the device will be operated. Refer to Figure 9,
which shows safe operating curves for three different
ambient temperatures, 25°C, 50°C, and 85°C. From
these curves, the minimum amount of copper can be
determined by knowing the maximum power dissipation
required. If the maximum ambient temperature is 50°C,
and the power dissipation is 632mW, the curve in Figure
9 shows that the required area of copper is less than
100mm 2 , when using the power SOIC-8.
December 2007
11
M9999-121007
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC5239YM | 功能描述:低压差稳压器 - LDO High Vin, Low Iq Regulator (Lead Free) RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MIC5239YM TR | 功能描述:低压差稳压器 - LDO High Vin, Low Iq Regulator (Lead Free) RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MIC5239YM | 制造商:Micrel Inc 功能描述:Linear Voltage Regulator IC |
| MIC5239YMM | 功能描述:低压差稳压器 - LDO High Vin, Low Iq Regulator (Lead Free) RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MIC5239YMM TR | 功能描述:低压差稳压器 - LDO High Vin, Low Iq Regulator (Lead Free) RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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