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參數(shù)資料
| 型號： | SPX1129M3-L-5-0 |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 400mA Low Dropout Voltage Regulator |
| 中文描述： | 400mA的低壓差穩(wěn)壓器 |
| 文件頁數(shù)： | 3/8頁 |
| 文件大小： | 765K |
| 代理商： | SPX1129M3-L-5-0 |
3
Mar3-07 SPX29 400 mA Low Dropout Linear Regulator
2007 Sipex Corporation
External Capacitors
The stability of the SPX1129 requires a 2.2
μ
F or
greater capacitor between output and ground.
Oscillation could occur without this capacitor.
Most types of tantalum or aluminum electrolytic
works fine here. For operations of below -25
°
C
solid tantalum is recommended since the many
aluminum types have electrolytes that freeze at
about -30
°
C. The ESR of about 5
1
or less and
resonant frequency above 500kHz are the most
important parameters in the value of the capaci-
tor. The capacitor value can be increased with-
out limit.
The SPX1129, unlike other low dropout regula-
tors will remain stable and in regulation with no
load in addition to the internal voltage divider.
This feature is especially important in applica-
tions like CMOS RAM keep-alive.
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, then a 0.1
μ
F tanta-
lum or aluminum electrolytic capacitor should
be placed from the input to the ground.
Reducing Output Noise
It may be an advantage to reduce the AC noise
present at the output. One way is to reduce the
regulator bandwidth by increasing the size of
the output capacitor. Increasing the capacitor
from 1
μ
F to 220
μ
F decreases the noise from
430
μ
V to 160
μ
V rms for a 100kHz bandwidth
at 5V output.
APPLICATION INFORMATION
相關PDF資料 |
PDF描述 |
|---|---|
| SPX1129R-3-3 | 400mA Low Dropout Voltage Regulator |
| SPX1129T-2.5 | 500mA Low Dropout Voltage Regulator |
| SPX1129T-3.3 | 500mA Low Dropout Voltage Regulator |
| SPX1129T-5.0 | 500mA Low Dropout Voltage Regulator |
| SPX1129U-3.3 | 500mA Low Dropout Voltage Regulator |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| SPX1129M3-L-5-0/TR | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| SPX1129N-2.5 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:500mA Low Dropout Voltage Regulator |
| SPX1129N-3.3 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:500mA Low Dropout Voltage Regulator |
| SPX1129N-5.0 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:500mA Low Dropout Voltage Regulator |
| SPX1129R-2.5 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:500mA Low Dropout Voltage Regulator |
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