参数资料
| 型号： | MIC3775YMM TR |
| 厂商： | Micrel Inc |
| 文件页数： | 12/13页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ .75A 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 ~ 6 V |
| 输入电压： | 2.25 V ~ 6 V |
| 电压 - 压降（标准）： | 0.28V @ 750mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 750mA |
| 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： | MIC3775YMMTR MIC3775YMMTR-ND |
Micrel, Inc.
Figure 5. Copper Area vs. Power-MSOP
Power Dissipation (T A )
? 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 4, 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:
MIC3775
P D = (V IN – V OUT ) I OUT + V IN ×I GND
If we use a 2.5V output device and a 3.3V input at an
output current of 750mA, then our power dissipation is
as follows:
P D = (3.3V – 2.5V) × 750mA + 3.3V × 7.5mA
P D = 600mW + 25mW
P D = 625mW
From Figure 4, the minimum amount of copper required
to operate this application at a ? T of 75°C is 160mm 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 5,
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, 625mW, the
curve in Figure 5 shows that the required area of copper
is 160mm 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.
December 2006
12
M9999-121906
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