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| 型号： | MIC5209YU |
| 厂商： | Micrel Inc |
| 文件页数： | 10/13页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ .5A TO263-5 |
| 标准包装： | 50 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 可调 |
| 输入电压： | 2.5 V ~ 16 V |
| 电压 - 压降（标准）： | 0.35V @ 500mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 500mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-263-6，D²Pak（5 引线+接片），TO-263BA |
| 供应商设备封装： | TO-263-5 |
| 包装： | 管件 |
| 产品目录页面： | 1097 (CN2011-ZH PDF) |
| 其它名称： | 576-1279 |
MIC5209
Micrel, Inc.
V IN
I N
OUT
EN
BYP
IN
OUT
EN
ADJ
FixedRegulatorCircuits
MIC5209-x.xBM
2 3
1 4
GND
5–8
V OUT
1μF
V IN
2
1
MIC5209BM
3
4
GND
5–8
470pF
R1
R2
V OUT
2.2μF
V IN
V OUT
I N
OUT
E N
BYP
470pF
V IN
V OUT
I N
OUT
R1
E N
ADJ
V IN
V OUT
I N
OUT
C IN
C OUT
0.1μF 22μF
R2
V OUT = 1.242V ? 1 +
? R2 ?
R1 ?
?
Figure1. Low-NoiseFixedVoltageRegulator
Figure 1 shows a basic MIC5209-x.xBM (SO-8) ? xed-voltage
regulator circuit. See Figure 5 for a similar con? guration us-
ing the more thermally-ef? cient MIC5209-x.xBS (SOT-223).
A 1μF minimum output capacitor is required for basic ? xed-
voltage applications.
MIC5209-x.xBM
2 3
1 4
GND 2.2μF
5–8
Figure 2. Ultra-Low-Noise Fixed Voltage Regulator
Figure 2 includes the optional 470pF noise bypass capacitor
between BYP and GND to reduce output noise. Note that the
minimum value of C OUT must be increased when the bypass
capacitor is used.
Adjustable Regulator Circuits
MIC5209BM
2 3
1 4
GND 1μF
5–8
Figure 3. Low-Noise Adjustable Voltage Regulator
The MIC5209BM/U can be adjusted to a speci? c output volt-
age by using two external resistors (Figure 3). The resistors
set the output voltage based on the equation:
?
This equation is correct due to the con? guration of the
bandgap reference. The bandgap voltage is relative to the
output, as seen in the block diagram. Traditional regula-
tors normally have the reference voltage relative to ground;
therefore, their equations are different from the equation for
the MIC5209BM/U.
Although ADJ is a high-impedance input, for best performance,
R2 should not exceed 470kΩ.
Figure 4. Ultra-Low-Noise Adjustable Application.
Figure 4 includes the optional 470pF bypass capacitor from
ADJ to GND to reduce output noise.
Slot-1 Power Supply
Intel’s Pentium II processors have a requirement for a 2.5V
±5% power supply for a clock synthesizer and its associated
loads. The current requirement for the 2.5V supply is depen-
dant upon the clock synthesizer used, the number of clock
outputs, and the type of level shifter (from core logic levels to
2.5V levels). Intel estimates a worst-case load of 320mA.
The MIC5209 was designed to provide the 2.5V power
requirement for Slot-1 applications. Its guaranteed perfor-
mance of 2.5V ±3% at 500mA allows adequate margin for
all systems, and its dropout voltage of 500mV means that it
operates from a worst-case 3.3V supply where the voltage
can be as low as 3.0V.
MIC5209-x.xBS
1 3
GND
2,TAB
Figure 5. Slot-1 Power Supply
A Slot-1 power supply (Figure 5) is easy to implement. Only
two capacitors are necessary, and their values are not criti-
cal. C IN bypasses the internal circuitry and should be at least
0.1μF. C OUT provides output ? ltering, improves transient
response, and compensates the internal regulator control
loop. Its value should be at least 22μF. C IN and C OUT may
be increased as much as desired.
Slot-1 Power Supply Power Dissipation
Powered from a 3.3V supply, the Slot-1 power supply of
Figure 5 has a nominal ef? ciency of 75%. At the maximum
anticipated Slot 1 load (320mA), the nominal power dissipa-
tion is only 256mW.
The SOT-223 package has suf? cient thermal characteristics
for wide design margins when mounted on a single layer
copper-clad printed circuit board. The power dissipation of
the MIC5209 is calculated using the voltage drop across the
device × output current plus supply voltage × ground current.
M9999-060906
10
June 2006
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| MIC5209YU TR | 功能描述:低压差稳压器 - LDO 500mA 1% 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 |
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