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| 型號： | SP6205ER-3.3 |
| 英文描述： | Low Noise, 300mA and 500mA CMOS LDO Regulators |
| 中文描述： | 低噪音，為300mA和500mA的CMOS LDO穩(wěn)壓器 |
| 文件頁數(shù)： | 10/14頁 |
| 文件大?。?/td> | 164K |
| 代理商： | SP6205ER-3.3 |
10
Date: 05/25/04
SP6203/6205 Low Noise, 300 and 500mA CMOS LDO Regulators
Copyright 2004 Sipex Corporation
Note that the regulator cannot always be used at
its maximum current rating. For example, in a
5V input to 3.0V output application at an ambi-
ent temperature of 25
°
C and operating at the full
500mA (I
GND
= 0.355mA) load, the regulator is
limited to a much lower load current, deter-
mined by the following equation:
390mW = ( [5V-3V]*[ I
load(max)
]) +(5V*0.355mA)
After calculation, we find that in such an appli-
cation (SP6205) the regulator is limited to
194.1mA. Doing the same calculations for the
300mA LDO (SP6203) will limit the regulator’s
output current to 194.4mA.
Also, taking advantage of the very low dropout
voltage characteristics of the SP6203/6205,
power dissipation can be reduced by using the
lowest possible input voltage to minimize the
input-to-output drop.
Adjustable Regulator Applications
The SP6203/6205 can be adjusted to a specific
output voltage by using two external resistors
(see functional diagram). The resistors set the
output voltage based on the following equation:
V
OUT
= V
REF
*(R1/R2 + 1)
Resistor values are not critical because ADJ
(adjust) has a high input impedance, but for best
performance use resistors of 470K
or less. A
bypass capacitor from ADJ to V
OUT
provides
improved noise performance.
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.
Layout Considerations
The primary path of heat conduction out of the
package is via the package leads. Therefore,
careful considerations have to be taken into
account:
1) Attaching the part to a larger copper footprint
will enable better heat transfer from the device,
especially on PCB’s where there are internal
ground and power planes.
2) Place the input, output and bypass capacitors
close to the device for optimal transient re-
sponse and device behavior.
3) Connect all ground connections directly to
the ground plane. In case there’s no ground
plane, connect to a common local ground point
before connecting to board ground.
Such layouts will provide a much better thermal
conductivity (lower
θ
JA
) for, a higher maximum
allowable power dissipation limit.
THEORY OF OPERATION: Continued
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| SP6205 | Low Noise, 300mA and 500mA CMOS LDO Regulators |
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| SP6203EM5-2.7 | Low Noise, 300mA and 500mA CMOS LDO Regulators |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| SP6205ER-3-3/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Noise, 300mA and 500mA CMOS LDO Regulators |
| SP6205ER-ADJ | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Noise, 300mA and 500mA CMOS LDO Regulators |
| SP6205ER-ADJ/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Noise, 300mA and 500mA CMOS LDO Regulators |
| SP6205ER-L | 功能描述:低壓差穩(wěn)壓器 - LDO Micropower, 500mA CMOS LDO Regulators RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| SP6205ER-L/TR | 功能描述:低壓差穩(wěn)壓器 - LDO Low Noise 500mA CMOS LDO Regulators RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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