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参数资料
| 型号： | MIC37300-1.8BR TR |
| 厂商： | Micrel Inc |
| 文件页数： | 9/15页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 1.8V 3A S-PAK-3 |
| 标准包装： | 750 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 1.8V |
| 输入电压： | 2.25 V ~ 6 V |
| 电压 - 压降（标准）： | 0.3V @ 3A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 3A（最小） |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SPAK-3 |
| 供应商设备封装： | S-PAK-3 |
| 包装： | 带卷 (TR) |
| 其它名称： | MIC37300-1.8BRTR MIC37300-1.8BRTR-ND |
Micrel, Inc.
Applications Information
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The MIC37300/01/02/03 is a high-performance low-
dropout voltage regulator suitable for moderate to
high-current regulator applications. Its 500mV dropout
MIC37300/01/02/03
Then the heat sink thermal resistance is determined
with Equation 2:
voltage at full load and over-temperature makes it
especially valuable in battery-powered systems and
as high- ef?ciency noise ?lters in post -regulator
θ SA = ((T J(max) – T A )/ P D ) – ( θ JC + θ CS )
Eq. 2
base drive requirement. Micrel’s Super ?eta PNP
Micrel’s Super ?eta PNP regulators allow signi?cant
applications. Unlike older NPN-pass transistor
designs, where the minimum dropout voltage is limited
by the based-to-emitter voltage drop and collector-to-
emitter saturation voltage, dropout performance of the
PNP output of these devices is limited only by the low
VCE saturation voltage.
A trade-off for the low dropout voltage is a varying
?
process reduces this drive requirement to only 2% to
5% of the load current.
The MIC37300/01/02/03 regulator is fully protected
from damage due to fault conditions. Current limiting
is provided. This limiting is linear; output current
during overload conditions is constant. Thermal
shutdown disables the device when the die
temperature exceeds the maximum safe operating
temperature. The output structure of these regulators
allows voltages in excess of the desired output
voltage to be applied without reverse current ?ow.
Thermal Design
Linear regulators are simple to use. The most
complicated design parameters to consider are
thermal characteristics. Thermal design requires the
following application- speci?c parameters:
? Maximum ambient temperature (T A )
where T J(max) < 125°C and θ CS is between 0°C and
2°C/W. The heat sink may be signi?cantly 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
?
reductions in regulator power dissipation and the
associated heat sink without compromising
performance. When this technique is employed, a
capacitor of at least 1.0μF is needed directly between
the input and regulator ground.
Output Capacitor
The MIC37300/01/02/03 requires an output capacitor
for stable operation. As a μCap LDO, the
MIC37300/01/02/03 can operate with ceramic output
capacitors as long as the amount of capacitance is
47μF or greater. For values of output capacitance
lower than 47μF, the recommended ESR range is
200m Ω to 2 Ω . The minimum value of output
capacitance recommended for the MIC37300 is 10μF.
For 47μF or greater, the ESR range recommended is
less than 1 Ω . Ultra-low ESR, ceramic capacitors are
recommended for output capacitance of 47μF or
?
?
?
?
Output current (I OUT )
Output voltage (V OUT )
Input voltage (V IN )
Ground current (I GND )
greater to help improve transient response and noise
reduction at high frequency. X7R/X5R dielectric-type
ceramic capacitors are recommended because of
their temperature performance. X7R-type capacitors
change capacitance by 15% over their operating
temperature range and are the most stable type of
ceramic capacitors. Z5U and Y5V dielectric capacitors
First, calculate the power dissipation of the regulator
from these numbers and the device parameters from
this datasheet (Equation 1):
change value by as much as 50% and 60%,
respectively, over their operating temperature ranges.
To use a ceramic chip capacitor with Y5V dielectric,
the value must be much higher than an X7R ceramic
capacitor to ensure the same minimum capacitance
P D = (V IN – V OUT ) I OUT + V IN I GND
Eq. 1
over the equivalent operating temperature range.
where the ground current is approximated by using
numbers from the “Electrical Characteristics” or
“Typical Characteristics.”
March 25, 2014
9
Revision 1.1
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|---|---|
| MIC37300-2.5BR | 功能描述:IC REG LDO 2.5V 3A S-PAK-3 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:3,000 系列:- 稳压器拓扑结构:正，固定式 输出电压:3.8V 输入电压:最高 16V 电压 - 压降（标准）:0.3V @ 80mA 稳压器数量:1 电流 - 输出:80mA 电流 - 限制（最小）:- 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:带卷 (TR) 其它名称:MIC5203-3.8BM5TRMIC5203-3.8BM5TR-ND |
| MIC37300-2.5BR TR | 功能描述:IC REG LDO 2.5V 3A S-PAK-3 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:3,000 系列:- 稳压器拓扑结构:正，固定式 输出电压:3.8V 输入电压:最高 16V 电压 - 压降（标准）:0.3V @ 80mA 稳压器数量:1 电流 - 输出:80mA 电流 - 限制（最小）:- 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:带卷 (TR) 其它名称:MIC5203-3.8BM5TRMIC5203-3.8BM5TR-ND |
| MIC37300-2.5WR | 功能描述:低压差稳压器 - LDO 3A Low Voltage LDO Regulator(ROHS Compliant) 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 |
| MIC37300-2.5WR TR | 功能描述:低压差稳压器 - LDO 3A Low Voltage LDO Regulator(ROHS Compliant) 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 |
| MIC37300-3.3BR | 功能描述:IC REG LDO 3.3V 3A S-PAK-3 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:3,000 系列:- 稳压器拓扑结构:正，固定式 输出电压:3.8V 输入电压:最高 16V 电压 - 压降（标准）:0.3V @ 80mA 稳压器数量:1 电流 - 输出:80mA 电流 - 限制（最小）:- 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:带卷 (TR) 其它名称:MIC5203-3.8BM5TRMIC5203-3.8BM5TR-ND |
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