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参数资料
| 型号： | MIC5205-3.0BM5 TR |
| 厂商： | Micrel Inc |
| 文件页数： | 8/10页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 3V .15A SOT23-5 |
| 标准包装： | 3,000 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 3V |
| 输入电压： | 最高 16V |
| 电压 - 压降（标准）： | 0.165V @ 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： | SC-74A，SOT-753 |
| 供应商设备封装： | SOT-23-5 |
| 包装： | 带卷 (TR) |
| 其它名称： | MIC5205-3.0BM5TR |
( T J(max) ? T A )
P D(max) =
( 125 ° C ? 25 ° C )
P D(max) =
Micrel
Application Information
Enable/Shutdown
Forcing EN (enable/shutdown) high (> 2V) enables the
regulator. EN is compatible with CMOS logic gates.
If the enable/shutdown feature is not required, connect
EN (pin 3) to IN (supply input, pin 1). See Figure 1.
Input Capacitor
A 1μF capacitor should be placed from IN to GND if
there is more than 10 inches of wire between the input
and the ac filter capacitor or if a battery is used as the
input.
Reference Bypass Capacitor
BYP (reference bypass) is connected to the internal
voltage reference. A 470pF capacitor (C BYP ) connected
from BYP to GND quiets this reference, providing a
significant reduction in output noise. C BYP reduces the
regulator phase margin; when using C BYP , output
capacitors of 2.2μF or greater are generally required to
maintain stability.
The start-up speed of the MIC5205 is inversely
proportional to the size of the reference bypass
capacitor. Applications requiring a slow ramp-up of
output voltage should consider larger values of C BYP .
Likewise, if rapid turn-on is necessary, consider omitting
C BYP .
If output noise is not a major concern, omit C BYP and
leave BYP open.
Output Capacitor
An output capacitor is required between OUT and GND
to prevent oscillation. The minimum size of the output
capacitor is dependent upon whether a reference bypass
capacitor is used. 1.0μF minimum is recommended
when C BYP is not used (see Figure 2). 2.2μF minimum is
recommended when C BYP is 470pF (see Figure 1).
Larger values improve the regulator’s transient
response. The output capacitor value may be increased
without limit.
The output capacitor should have an ESR (effective
series resistance) of about 5 ? or less and a resonant
frequency above 1MHz. Ultra-low-ESR capacitors can
cause a low amplitude oscillation on the output and/or
underdamped transient response. Most tantalum or
aluminum electrolytic capacitors are adequate; film types
will work, but are more expensive. Since many aluminum
electrolytics have electrolytes that freeze at about –
30 ° C, solid tantalums are recommended for operation
below –25 ° C.
MIC5205
0.33μF for currents below 1mA.
No-Load Stability
The MIC5205 will remain stable and in regulation with no
load (other than the internal voltage divider) unlike many
other voltage regulators. This is especially important in
CMOS RAM keep-alive applications.
Thermal Considerations
The MIC5205 is designed to provide 150mA of
continuous current in a very small package. Maximum
power dissipation can be calculated based on the output
current and the voltage drop across the part. To
determine the maximum power dissipation of the
package, use the junction-to-ambient thermal resistance
of the device and the following basic equation:
θ JA
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-toambient thermal resistance for the MIC5205.
Package θ JA θ JA Square θ JC
Recommended Copper Clad
Minimum
Footprint
SOT-23-5(M5) 220°C/W 170°C/W 130°C/W
Table 1. SOT-23-5 Thermal Resistance
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 MIC5205-3.3BM5 at
room temperature with a minimum footprint layout, the
maximum input voltage for a set output current can be
determined as follows:
220 ° C/W
P D(max) = 455mW
The junction-to-ambient thermal resistance for the
minimum footprint is 220 ° C/W, from Table 1. The
maximum power dissipation must not be exceeded for
proper operation. Using the output voltage of 3.3V and
an output current of 150mA, the maximum input voltage
can be determined. From the Electrical Characteristics
table, the maximum ground current for 150mA output
current is 2500μA or 2.5mA.
At lower values
of output current,
less output
455mW = (V IN – 3.3V) 150mA + V IN ·2.5mA
capacitance is required for output stability. The capacitor
can be reduced to 0.47 ? F for current below 10mA or
455mW = V IN ×150mA – 495mW + V IN ·2.5mA
950mW = V IN ×152.5mA
February 2006
8
M9999-020806
(408) 955-1690
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC520533BM5 | 制造商:MICREL 功能描述:New |
| MIC520533BM5TR | 制造商:MICREL 功能描述:New |
| MIC5205-4.0BM5 | 制造商:RF Micro Devices Inc 功能描述: 制造商:Micrel Inc 功能描述: |
| MIC5205-4.0BM5 TR | 功能描述:IC REG LDO 4V .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 |
| MIC5205-4.0YM5 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:150mA Low-Noise LDO Regulator |
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