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參數(shù)資料
| 型號： | IC5205BM5 |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | 150mA Low-Noise LDO Regulator |
| 中文描述： | 150mA低噪聲LDO穩(wěn)壓器 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 99K |
| 代理商： | IC5205BM5 |
MIC5205
Micrel
MIC5205
8
June 2000
Fixed Regulator Applications
1
5
2
3
4
2.2μF
470pF
V
OUT
MIC5205-x.xBM5
V
IN
Figure 1. Ultra-Low-Noise Fixed Voltage Application
Figure 1 includes a 470pF capacitor for low-noise operation
and shows EN (pin 3) connected to IN (pin 1) for an applica-
tion where enable/shutdown is not required. C
OUT
= 2.2
μ
F
minimum.
1
5
2
3
4
1.0μF
Enable
Shutdown
EN
V
OUT
MIC5205-x.xBM5
V
IN
Figure 2. Low-Noise Fixed Voltage Application
Figure 2 is an example of a low-noise configuration where
C
BYP
is not required. C
OUT
= 1
μ
F minimum.
Adjustable Regulator Applications
The MIC5205BM5 can be adjusted to a specific output
voltage by using two external resistors (Figure 3). The resis-
tors set the output voltage based on the following equation:
V
= 1.242V
R1 + 1
OUT
×
This equation is correct due to the configuration of the
bandgap reference. The bandgap voltage is relative to the
output, as seen in the block diagram. Traditional regulators
normally have the reference voltage relative to ground and
have a different V
OUT
equation.
Resistor values are not critical because ADJ (adjust) has a
high input impedance, but for best results use resistors of
470k
or less. A capacitor from ADJ to ground provides
greatly improved noise performance.
1
5
2
3
4
2.2μF
470pF
V
OUT
MIC5205BM5
R1
R2
V
IN
Figure 3. Ultra-Low-Noise
Adjustable Voltage Application
Figure 3 includes the optional 470pF noise bypass capacitor
from ADJ to GND to reduce output noise.
Dual-Supply Operation
When used in dual supply systems where the regulator load
is returned to a negative supply, the output voltage must be
diode clamped to ground.
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