参数资料
| 型号： | MIC29752WWT |
| 厂商： | Micrel Inc |
| 文件页数： | 19/25页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ 7.5A TO247-5 |
| 标准包装： | 30 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 1.25 V ~ 26 V |
| 输入电压： | 最高 26V |
| 电压 - 压降（标准）： | 0.425V @ 7.5A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 7.5A |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 通孔 |
| 封装/外壳： | TO-247-5 |
| 供应商设备封装： | TO-247-5 |
| 包装： | 管件 |
| 产品目录页面： | 1107 (CN2011-ZH PDF) |
| 其它名称： | 576-1157 |
Micrel, Inc.
Application Information
Thermal Design
MIC29150/29300/29500/29750
The
MIC29150/29300/29500/29750
are
high-
Linear
regulators are simple to use.
The most
performance low-dropout voltage regulators suitable for
complicated design parameters to consider are thermal
all moderate to high-current
voltage regulator
characteristics. Thermal design requires the following
applications. Their 350mV to 425mV typical dropout
application-specific parameters:
voltage at full load make them especially valuable in
battery powered systems and as high efficiency noise
filters in “post-regulator” applications. Unlike older NPN-
pass transistor designs, where the minimum dropout
voltage is limited by the base-emitter voltage drop and
collector-emitter saturation voltage, dropout performance
?
?
?
?
Maximum ambient temperature, T A
Output Current, I OUT
Output Voltage, V OUT
Input Voltage, V IN
driver requirement. But Micrel’s Super ?eta PNP
of the PNP output of these devices is limited merely by
the low V CE saturation voltage.
A trade-off for the low-dropout voltage is a varying base
?
First, we calculate the power dissipation of the regulator
from these numbers and the device parameters from this
datasheet.
process reduces this drive requirement to merely 1% of
the load current.
The MIC29150/29300/29500/29750 family of regulators
P D = I OUT ( 1.01 V IN ? V OUT )
Eq. 1
are fully protected from damage due to fault conditions.
Current limiting is provided. This limiting is linear; output
current under overload conditions is constant. Thermal
shutdown disables the device when the die temperature
where the ground current is approximated by 1% of I OUT .
Then the heat sink thermal resistance is determined with
Equation 2:
exceeds the 125°C maximum safe operating
temperature. Line transient protection allows device (and
load) survival even when the input voltage spikes
between –20V and +60V. When the input voltage
θ SA =
T JMAX ? T A
P D
? ( θ JC + θ CS )
Eq. 2
?eta PNP regulators allow very significant reductions in
exceeds approximately 32V, the over voltage sensor
disables the regulator. The output structure of these
regulators allows voltages in excess of the desired
output voltage to be applied without reverse current flow.
MIC29xx1 and MIC29xx2 versions offer a logic level
ON/OFF control: when disabled, the devices draw nearly
zero current.
An additional feature of this regulator family is a common
pinout: a design’s current requirement may change up or
down yet use the same board layout, as all of these
regulators have identical pinouts.
MIC29XXX
where T JMAX ≤ 125°C and θ CS is between 0 and 2°C/W.
The heat sink may be significantly reduced in
applications where the minimum input voltage is known
and is large compared with the dropout voltage. Use a
series input resistor to drop excessive voltage and
distribute the heat between this resistor and the
regulator. The low-dropout properties of Micrel Super
?
regulator power dissipation and the associated heat sink
without compromising performance. When this technique
is employed, a capacitor of at least 0.1μF is needed
directly between the input and regulator ground.
Please refer to Application Note 9 and Application Hint
V IN
IN
OUT
V OUT
17 for further details and examples on thermal design
and heat sink specification.
With no heat sink in the application, calculate the
100mm copper area for the MIC29152.
GND
Figure 3. Linear Regulators Require Only
Two Capacitors for Operation
junction temperature to determine the maximum power
dissipation that will be allowed before exceeding the
maximum junction temperature of the MIC29152. The
maximum power allowed can be calculated using the
thermal resistance ( θ JA ) of the D-Pak adhering to the
following criteria for the PCB design: 2 oz. copper and
2
December 2012
19
M9999-122012-B
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| MIC2981/82BWM TR | 功能描述:闭锁 Hi-Voltage, Hi-Current Source Driver Array RoHS:否 制造商:Micrel 电路数量:1 逻辑类型:CMOS 逻辑系列:TTL 极性:Non-Inverting 输出线路数量:9 高电平输出电流: 低电平输出电流: 传播延迟时间: 电源电压-最大:12 V 电源电压-最小:5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-16 封装:Reel |
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