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参数资料
| 型号： | MIC5239BMM TR |
| 厂商： | Micrel Inc |
| 文件页数： | 10/14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
Current Limit
Figure 4 displays a method for reducing the steady state
short-circuit current. The duration that the supply
delivers current is set by the time required for the error
flag output to discharge the 4.7μF capacitor tied to the
enable pin. The off time is set by the 200k ? resistor as it
recharges the 4.7μF capacitor, enabling the regulator.
This circuit reduces the short-circuit current from 800mA
to 40mA while allowing for regulator restart once the
short is removed.
1N4148
MIC5239
V IN
5V
SHUTDOWN
ENABLE
200k
200k
MIC5239
IN OUT
EN FLG
GND
4.7μF
V ERR
V OUT
C OUT
Figure 5. Thermal Resistance
Using the power MSOP-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 power
MSOP-8 has a θ JC of 80°C/W, this is significantly lower
than the standard MSOP-8 which is typically 200°C/W.
Figure 4. Remote Enable with Short-Circuit
Current Foldback
Thermal Characteristics
The MIC5239 is a high input voltage device, intended to
provide 500mA of continuous output current in two very
small profile packages. The power MSOP-8 allows the
device to dissipate about 50% more power than their
standard equivalents.
Power MSOP-8 Thermal Characteristics
One of the secrets of the MIC5239’s performance is its
power MSOP-8 package featuring half the thermal
resistance of a standard MSOP-8 package. Lower
thermal resistance means more output current or higher
input voltage for a given package size.
Lower thermal resistance is achieved by joining the four
ground leads with the die attach paddle to create a
single piece electrical and thermal conductor. This
concept has been used by MOSFET manufacturers for
years, proving very reliable and cost effective for the
user.
Thermal resistance consists of two main elements, θ JC
(junction-to-case thermal resistance) and θ CA (case-to-
ambient thermal resistance). See Figure 5. θ JC is the
resistance from the die to the leads of the package. θ CA
is the resistance from the leads to the ambient air and it
includes θ CS (case-to-sink thermal resistance) and θ SA
(sink-to-ambient thermal resistance).
θ CA is reduced because pins 5 through 8 can now be
soldered directly to a ground plane which significantly
reduces the 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 heatsink must be used.
Figure 6. Copper Area vs. Power-MSOP
Power Dissipation ( ? T JA )
Figure 6 shows copper area versus power dissipation
with each trace corresponding to a different temperature
rise above ambient.
From these curves, the minimum area of copper
necessary for the part to operate safely can be
determined. The maximum allowable temperature rise
must be calculated to determine operation along which
curve.
December 2007
10
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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