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| 型号： | MIC5201-4.8YS |
| 厂商： | Micrel Inc |
| 文件页数： | 8/9页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 4.8V .2A SOT223 |
| 标准包装： | 78 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 4.8V |
| 输入电压： | 最高 26V |
| 电压 - 压降（标准）： | 0.27V @ 200mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 200mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-261-4，TO-261AA |
| 供应商设备封装： | SOT-223 |
| 包装： | 管件 |
| 产品目录页面： | 1096 (CN2011-ZH PDF) |
| 其它名称： | 576-1252 |
MIC5201
Micrel, Inc.
Applications Information
V IN
MIC5201BM
V OUT
Figure 1 shows a basic fixed-voltage application with the
unused enable input connected to V IN .
IN
EN
OUT
ADJ
GND
R1
3.3 μ F
V IN
MIC5201-x.xBM
MIC5201-x.xBS
V OUT
R2
C ADJ
IN
EN
OUT
Figure 3. Decreasing Ouput Noise
GND
1 μ F
Minimum Load
The MIC5201 will remain stable and in regulation with no
Figure 1. Fixed Application
Adjustable regulators require two resistors to set the output
voltage. See Figure 2.
load unlike many other voltage regulators. This is
especially important in CMOS RAM keep-alive
applications.
V IN
MIC5201BM
IN OUT
V OUT
Dual-Supply Systems
When used in dual supply systems where the regulator
EN
ADJ
GND
R1
3.3 μ F
load is returned to a negative supply, the output voltage
must be diode clamped to ground.
V OUT = 1.242V ? 1 +
?
R1 ?
R2
? R2 ?
?
Figure 2. Adjustable Application
Resistors values are not critical because ADJ (adjust) has a
Thermal Considerations Layout
The MIC5201-x.xBM (8-pin surface mount package) has the
following thermal characteristics when mounted on a single
layer copper-clad printed circuit board.
high impedance, but for best results use resistors of 470k ?
or less.
Output Capacitors
A 1 μ F capacitor is recommended between the MIC5201
PC Board
Dielectric
FR4
Ceramic
θ JA
160oC/W
120oC/W
output and ground to prevent oscillations due to instability.
Larger values serve to improve the regulator’s transient
response. Most types of tantalum or aluminum electrolytics
will be adequate; film types will work, but are costly and
therefore not recommended. Many aluminum electrolytics
have electrolytes that freeze at about –30 ° C, so solid tanta-
lums are recommended for operation below –25 ° C. The
important parameters of the capacitor are an effective series
resistance of about 5 ? or less and a resonant frequency
above 500kHz. The value of this capacitor may be increased
without limit.
At lower values of output current, less output capacitance is
required for output stability. The capacitor can be reduced to
0.47 μ F for current below 10mA or 0.33 μ F for currents below
1mA.
Input Capacitors
A 1 μ F capacitor should be placed from the MIC5201 input to
ground 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.
Noise Reduction Capacitors
On adjustable devices, a capacitor from ADJ to GND will
Multilayer boards having a ground plane, wide traces near the
pads, and large supply bus lines provide better thermal
conductivity.
The “worst case” value of 160 ° C/W assumes no ground
plane, minimum trace widths, and a FR4 material board.
Nominal Power Dissipation and Die Temperature
The MIC5201-x.xBM at a 25 ° C ambient temperature will
operate reliably at up to 625mW power dissipation when
mounted in the “worst case” manner described above. At an
ambient temperature of 55 ° C, the device may safely dissi-
pate 440mW. These power levels are equivalent to a die
temperature of 125 ° C, the recommended maximum tem-
perature for non-military grade silicon integrated circuits.
For MIC5201-x.xBS (SOT-223 package) heat sink character-
istics, please refer to Micrel Application Hint 17, P.C. Board
Heat Sinking .
50 mil
decrease high-frequency noise on the output. See Figure 3.
245 mil
30 mil
50 mil
150 mil
Figure 4. Min. Recommended SO-8 PCB Pads Size
MIC5201
8
June 2005
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC5201-5.0BM | 功能描述:IC REG LDO 5V .2A 8SOIC 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，固定式和可调式 输出电压:3.3V，1.25 V ~ 5.7 V 输入电压:4.5 V ~ 7 V 电压 - 压降（标准）:1.1V @ 1A 稳压器数量:2 电流 - 输出:1A 电流 - 限制（最小）:1A 工作温度:0°C ~ 125°C 安装类型:表面贴装 封装/外壳:TO-252-5，DPak（4 引线 + 接片），TO-252AD 供应商设备封装:PPAK 包装:管件 其它名称:497-3576-5 |
| MIC5201-5.0BM TR | 功能描述:IC REG LDO 5V .2A 8-SOIC 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 |
| MIC5201-5.0BMTR | 制造商:Micrel Inc 功能描述:Voltage Regulator, +5V, Bi-Polar, 8 Pin, Plastic, SOP |
| MIC5201-5.0BS | 功能描述:IC REG LDO 5V .2A SOT223 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 |
| MIC5201-5.0BS TR | 功能描述:IC REG LDO 5V .2A SOT-223 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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