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| 型号： | MIC5207-1.8BM5 TR |
| 厂商： | Micrel Inc |
| 文件页数： | 9/13页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 1.8V .18A SOT23-5 |
| 标准包装： | 3,000 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 1.8V |
| 输入电压： | 2.5 V ~ 16 V |
| 电压 - 压降（标准）： | 0.165V @ 150mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 180mA |
| 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： | MIC5207-1.8BM5TR MIC5207-1.8BM5TR-ND |
( T J(MAX) ? T A )
Micrel, Inc.
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. CBYP reduces the
regulator phase margin; when using CBYP, output
capacitors of 2.2μF or greater are generally required to
maintain stability.
MIC5207
No-Load Stability
The MIC5207 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
CMOSRAM keep-alive applications.
Thermal Considerations
The MIC5207 is designed to provide 180mA 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:
P D(MAX) =
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-to-ambient thermal resistance for the MIC5207.
The start-up speed of the MIC5207 is inversely
proportional to the size of the reference bypass
capacitor. Applications requiring a slow ramp-up of
Package
SOT-23-5
θ JA Recommemded
Minimum Footprint
235°C/W
θ JA 1” Square
Copper Clad
170°C/W
θ J/C
130°C/W
output voltage should consider larger values of C BYP .
Likewise, if rapid turn-on is necessary, consider omitting
C BYP .
(M5)
Table 1. SOT-23-5 Thermal Resistance
P D(MAX) =
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 CBYP 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
under-damped 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.
At lower values of output current, less output
capacitance is required for output stability. The capacitor
can be reduced to 0.47μF for current below 10mA or
0.33μF for currents below 1mA.
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 MIC5207-3.3BM5 at
room temperature with a minimum footprint layout, the
maximum input voltage for a set output current can be
determined as follows:
125 ° C ? 25 ° C
235
P D(MAX) = 425mW
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 3000μA or 3mA.
455mW = ( V IN ? 3.3 ) 150mA + V IN ? 3mA
455mW = V IN ? 150mA - 495mW + V IN ? 3mA
920mW = V IN ? 153mA
December 2007
9
M9999-123107
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC5207-2.5BM5 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MIC5207-2.5BM5 TR | 功能描述:IC REG LDO 2.5V .18A SOT23-5 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 |
| MIC5207-2.5YM5 | 制造商:Rochester Electronics LLC 功能描述: 制造商:RF Micro Devices Inc 功能描述: |
| MIC5207-2.5YM5 TR | 功能描述:低压差稳压器 - LDO 180mA 3% Low Noise LDO(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 |
| MIC5207-2.5YM5 TX | 制造商:Micrel 功能描述:The Micrel MIC5207-2.5YM5 TX is a 180mA Low Dropout Voltage Regulator. |
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