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参数资料
| 型号： | MIC5256-3.0BM5 |
| 厂商： | Micrel Inc |
| 文件页数： | 11/13页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 3V .15A SOT23-5 |
| 标准包装： | 1,950 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 3V |
| 输入电压： | 最高 6V |
| 电压 - 压降（标准）： | 0.135V @ 150mA |
| 稳压器数量： | 1 |
| 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： | SC-74A，SOT-753 |
| 供应商设备封装： | SOT-23-5 |
| 包装： | 管件 |
Micrel, Inc.
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
junction-to-ambient thermal resistance for the MIC5256.
MIC5256
can be determined. Because this device is CMOS and
the ground current is typically 100μA over the load
range, the power dissipation contributed by the ground
current is < 1% and can be ignored for this calculation.
Package
SOT23-5
(M5 or D5)
θ JA Recommended
Minimum Footprint
235°C/W
θ JA 1” Square
Copper Clad
185°C/W
θ JC
145°C/W
315mW = (V IN – 3.0V) 150mA
315mW = V IN ·?150mA – 450mW
810mW = V IN ·?150mA
V IN(max) = 5.4V
Table 1. SOT-23-5 Thermal Resistance
Therefore, a 3.0V application at 150mA of output current
P D(max) = ?
? 125 ° C ? 50 ° C ?
The actual power dissipation of the regulator circuit can
be determined using the equation:
P D = (V IN – V OUT ) I OUT + V IN I GND
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 MIC5256-3.0BM5 at
50°C with a minimum footprint layout, the maximum
input voltage for a set output current can be determined
as follows:
?
? 235 ° C/W ?
P D(max) = 315mW
The junction-to-ambient thermal resistance for the
minimum footprint is 235°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 150mA, the maximum input voltage
can accept a maximum input voltage of 5.4V in a SOT-
23-5 package. For a full discussion of heat sinking and
thermal effects on voltage regulators, refer to the
“Regulator Thermals” section of Micrel’s Designing with
Low-Dropout Voltage Regulators handbook.
Fixed Regulator Applications
Figure 1. Low-Noise Fixed Voltage Application
Figure 1 shows a standard low-noise configuration with a
47k ? pull-up resistor from the error flag to the input
voltage and a pull-down capacitor to ground for the
purpose of fault indication. EN (Pin 3) is connected to IN
(Pin 1) for an application where enable/shutdown is not
required. C OUT = 1.0μF minimum.
August 2010
11
M9999-080510
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC5258 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:150mA UCap CMOS LDO Regulator w/Power Good |
| MIC5258_06 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:150mA μCap CMOS LDO Regulator w/Power Good |
| MIC5258-1.2BM5 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MIC5258-1.2BM5 TR | 功能描述:IC REG LDO 1.2V .15A SOT23-5 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 |
| MIC5258-1.2YM5 | 制造商:Rochester Electronics LLC 功能描述: 制造商:RF Micro Devices Inc 功能描述: |
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