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參數(shù)資料
| 型號(hào)： | SPX1521U-3.3 |
| 元件分類(lèi)： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 300mA Low Dropout Voltage Regulator |
| 中文描述： | 300mA低壓差穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 3/8頁(yè) |
| 文件大?。?/td> | 94K |
| 代理商： | SPX1521U-3.3 |
3
Date: 5/25/04
SPX1521 300mA Low Dropout Voltage Regulator
Copyright 2004 Sipex Corporation
External Capacitors
The stability of the SPX1521 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
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 SPX1521, 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 tantalum
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 only decreases the noise
from 430
μ
V to 160
μ
Vrms for a 100kHz band-
width at 5V output.
APPLICATION INFORMATION
Top View
SPX1521
1
3
2
SOT-223 (M3)
Top View
TO-263-3 (T)
1
SPX1521
2
3
Front View
TO-220-3 (U)
SPX1521
1
2
3
Front View
TO-252 (R)
3
2
1
V
IN
GND V
OUT
V
OUT
GND V
IN
V
OUT
GND V
IN
V
OUT
GND
V
IN
PINOUTS
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| SPX1521 | 300mA Low Dropout Voltage Regulator |
| SPX1521M3 | 300mA Low Dropout Voltage Regulator |
| SPX1521R | 10-Bit, 40MSPS ADC with PGA, Dual Ch., Low Power 48-TQFP -40 to 85 |
| SPX1521S | 300mA Low Dropout Voltage Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SPX1521U-5.0 | 制造商:SIPEX 制造商全稱(chēng):Sipex Corporation 功能描述:300mA Low Dropout Voltage Regulator |
| SPX1521U-5-0 | 制造商:SIPEX 制造商全稱(chēng):Sipex Corporation 功能描述:300mA Low Dropout Voltage Regulator |
| SPX1521U-L-3-3 | 制造商:SIPEX 制造商全稱(chēng):Sipex Corporation 功能描述:300mA Low Dropout Voltage Regulator |
| SPX1521U-L-5-0 | 制造商:SIPEX 制造商全稱(chēng):Sipex Corporation 功能描述:300mA Low Dropout Voltage Regulator |
| SPX1580 | 制造商:SIPEX 制造商全稱(chēng):Sipex Corporation 功能描述:7A Ultra Dropout Voltage Regulator Fast Response, Adjustable & Fixed |
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