参数资料
| 型号： | MIC5249-3.3YMM TR |
| 厂商： | Micrel Inc |
| 文件页数： | 6/7页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 3.3V .3A 8-MSOP |
| 标准包装： | 2,500 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 3.3V |
| 输入电压： | 最高 6V |
| 电压 - 压降（标准）： | 0.34V @ 300mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 300mA |
| 电流 - 限制（最小）： | 300mA |
| 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： | MIC5249-3.3YMMTR MIC5249-3.3YMMTR-ND |
Micrel, Inc.
Thermal Considerations
The MIC5249 is designed to provide 300mA of
continuous current in a very small package. Maximum
power dissipation can be calculated based on the output
current and the voltage drop across the device. To
determine the maximum power dissipation of the
package, use the junction-to-ambient thermal resistance
of the device and the following basic equation:
MIC5249
Substituting P D(max) for P D and solving for the operating
conditions that are critical to the application will give the
maximum operating conditions for the regulator circuit.
For example, when operating the MIC5249-3.0YMM at
50°C with a minimum footprint layout, the maximum
input voltage for a set output current can be determined
as follows:
= ? ?
?
?
P D(max) = ?
? 125 ° C ? 50 ° C ?
? 160 ° C/W
P D(max)
? T J(max) ? T A
? θ JA
?
?
?
?
The junction-to-ambient thermal resistance for the
T J(max) is the maximum junction temperature of the die,
125°C and T A is the ambient operating temperature. θ JA
is layout dependent; Table 1 shows examples of the
junction-to-ambient thermal resistance for the MIC5249.
minimum footprint is 160°C/W, from Table 1. The
maximum power dissipation must not be exceeded for
proper operation. Using the output voltage of 3.0V, and
an output current of 300mA, the maximum input voltage
can be determined. Because this device is CMOS and
the ground current is typically 90μA over the load range,
Package
MSOP-8
θ JA Recommended Minimum Footprint
160°C/W
the power dissipation contributed by the ground current
is < 1.0% and can be ignored for this calculation:
Table 1. MSOP-8 Thermal Resistance
The actual power dissipation of the regulator circuit can
468mW = (V IN – 3.0V) 300mA
468mW = V IN × 300mA – 900mW
1368mW = V IN × 300mA
V IN(max) = 4.56V
be determined using the equation:
Therefore, a 3.0V application at 300mA of output current
can accept a maximum input voltage of 4.56V in the
P D = (V IN – V OUT ) I OUT + V IN I GND
MSOP-8 package. For a full discussion of heat sinking
and thermal effects on the voltage regulators, refer to the
“Regulator Thermals” section of Micrel’s Designing with
Low-Dropout Voltage Regulators Handbook .
March 2012
6
M9999-030812
相关PDF资料 |
PDF描述 |
|---|---|
| MIC5259-3.0YD5 TR | IC REG LDO 3V .3A TSOT23-5 |
| MIC5259-2.8YD5 TR | IC REG LDO 2.8V .3A TSOT23-5 |
| MIC5259-1.8YD5 TR | IC REG LDO 1.8V .3A TSOT23-5 |
| MIC5259-1.5YD5 TR | IC REG LDO 1.5V .3A TSOT23-5 |
| MIC5249-3.0YMM TR | IC REG LDO 3V .3A 8-MSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC5250 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Dual 150mA μCap CMOS LDO Regulator |
| MIC5250_03 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Dual 150mA μCap CMOS LDO Regulator |
| MIC5250-2.7BMM | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Dual 150mA μCap CMOS LDO Regulator |
| MIC5250-2.8BMM | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Dual 150mA レCap CMOS LDO Regulator Preliminary Information |
| MIC5250-3.0BMM | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Dual 150mA レCap CMOS LDO Regulator Preliminary Information |
发布紧急采购，3分钟左右您将得到回复。