参数资料
| 型号： | MIC5234YME |
| 厂商： | Micrel Inc |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ .15A 8SOIC |
| 标准包装： | 95 |
| 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）： | 0.32V @ 150mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 150mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm Width）裸露焊盘 |
| 供应商设备封装： | 8-SOIC-EP |
| 包装： | 管件 |
Micrel, Inc.
resistance from the case (ePad) to the ambient air and it
includes θ CS case (ePad)-to-sink thermal resistance and
θ SA sink-to-ambient thermal resistance.
Figure 3. Thermal Resistance
MIC5234
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 8V input with an
output current of 150mA, then our power dissipation is
as follows:
P D = (8V – 3V) × 150mA + (8V × 2.6mA)
P D = 750mW + 20.8mW
P D = 770.8mW
A copper plane should be provided to dissipate the heat
to keep junction temperature 125°C.
Adjustable Regulator Application
The MIC5234 can be adjusted from 1.24V to 20V by
using two external resistors (see Figure 4). The resistors
V OUT = V REF × ? 1 +
?
Using the ePad SOIC-8 reduces the θ JC dramatically and
allows the user to reduce θ CA . The total thermal
resistance, θ JA (junction-to-ambient thermal resistance)
is the limiting factor in calculating the maximum power
dissipation capability of the device. Typically, the ePad
SOIC-8 has a θ JC of 14.7°C/W, this is significantly lower
than the standard SOIC-8 which is typically 48.8°C/W.
θ CA is reduced because ePad can now be soldered
directly to a ground plane which significantly reduces the
set the output voltage based on Equation 1:
? R1 ?
? R2 ?
Where V REF = 1.23V.
Eq. 1
case-to-sink thermal resistance and sink-to-ambient
thermal resistance.
Low-dropout linear regulators from Micrel are rated to a
maximum junction temperature of 125°C. It is important
not to exceed this maximum junction temperature during
operation of the device. To prevent this maximum
junction temperature from being exceeded, the
appropriate ground plane heat sink must be used.
The maximum allowable temperature rise must be
calculated to determine the required heat sink:
Figure 4. Adjustable Voltage Application
Δ T = T J(MAX) – T A(MAX)
? V OUT
?
Then R1 = R 2 × ? 1 ?
? V ?
T J(MAX) = 125°C
T A(MAX) = maximum ambient operating temperature
For example, the maximum ambient temperature is
50°C, the Δ T is determined as follows:
Example:
If output voltage to be set is 3.3V and R2 is selected as
1.2k ? .
?
? REF ?
R1 = 1 . 2 k ? × ?
? 1 ? = 2.019 k ?
Δ T = 125°C – 50°C
Δ T = 75°C
September 2011
10
? 3.3V
? 1.23V
?
?
M9999-092711-B
相关PDF资料 |
PDF描述 |
|---|---|
| MIC5235-3.0YM5 TR | IC REG LDO 3V .15A SOT23-5 |
| MIC5236-2.5YMM | IC REG LDO 2.5V .15A 8-MSOP |
| MIC5237-5.0YU TR | IC REG LDO 5V .5A TO-263 |
| MIC5238-1.0YM5 TR | IC REG LDO 1V .15A SOT23-5 |
| MIC5239-1.8YM | IC REG LDO 1.8V .5A 8-SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC5234YME TR | 功能描述:低压差稳压器 - LDO Low Quiescent Current uCap LDO 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 |
| MIC5235 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Ultra-Low Quiescent Current, 150mA UCap LDO Regulator |
| MIC5235_09 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Ultra-Low Quiescent Current, 150mA μCap LDO Regulator |
| MIC5235-1.5BM5 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MIC5235-1.5BM5 TR | 功能描述:IC REG LDO 1.5V .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 |
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