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參數(shù)資料
| 型號： | LP3999ITLX-2.5 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Low Noise 150mA Voltage Regulator for RF/Analog Applications |
| 中文描述： | 2.5 V FIXED POSITIVE LDO REGULATOR, 0.1 V DROPOUT, PBGA5 |
| 封裝： | MICRO, SMD-5 |
| 文件頁數(shù)： | 11/12頁 |
| 文件大?。?/td> | 683K |
| 代理商： | LP3999ITLX-2.5 |
Application Hints
(Continued)
The types of capacitors best suited for the noise bypass
capacitor are ceramic and film. High quality ceramic capaci-
tors with NPO or COG dielectric typically have very low
leakage. Polypropolene and polycarbonate film capacitors
are available in small surface-mount packages and typically
have extremely low leakage current.
Unlike many other LDO’s, the addition of a noise reduction
capacitor does not effect the transient response of the de-
vice.
ENABLE OPERATION
The LP3999 may be switched ON or OFF by a logic input at
the ENABLE pin, V
EN
. A high voltage at this pin will turn the
device on. When the enable pin is low, the regulator output is
off and the device typically consumes 3 nA. If the application
does not require the shutdown feature, the V
pin should
be tied to V
to keep the regulator output permanently on.
To ensure proper operation, the signal source used to drive
the V
input must be able to swing above and below the
specified turn-on/off voltage thresholds listed in the Electrical
Characteristics section under V
IL
and V
IH
.
FAST TURN ON
Fast turn-on is guaranteed by control circuitry within the
reference block allowing a very fast ramp of the output
voltage to reach the target voltage. There is no active turn-off
on this device. Refer to LP3995 for a similar device with
active turn-off.
microSMD MOUNTING
The micro SMD package requires specific mounting tech-
niques which are detailed in National Semiconductor Appli-
cation Note AN-1112.
Referring to the section
Surface Mount Technology (SMT)
Assembly Considerations
, it should be noted that the pad
style which must be used with the 5 pin package is NSMD
(non-solder mask defined) type.
For best results during assembly, alignment ordinals on the
PC board may be used to facilitate placement of the micro
SMD device.
microSMD LIGHT SENSITIVITY
Exposing the micro SMD device to direct sunlight will cause
incorrect operation of the device. Light sources such as
halogen lamps can affect electrical performance if they are
situated in proximity to the device.
Light with wavelengths in the red and infra-red part of the
spectrum have the most detrimental effect thus the fluores-
cent lighting used inside most buildings has very little effect
on performance. Tests carried out on a micro SMD test
board showed a negligible effect on the regulated output
voltage when brought within 1 cm of a fluorescent lamp. A
deviation of less than 0.1% from nominal output voltage was
observed.
L
www.national.com
11
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PDF描述 |
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| LP3999ITLX-2.5NOPB | Low Noise 150mA Voltage Regulator for RF/Analog Applications |
| LP3999ITLX-2.6 | Low Noise 150mA Voltage Regulator for RF/Analog Applications |
| LP3999ITLX-2.6NOPB | Low Noise 150mA Voltage Regulator for RF/Analog Applications |
| LP3999ITLX-2.8 | Low Noise 150mA Voltage Regulator for RF/Analog Applications |
| LP3999ITLX-2.8NOPB | Low Noise 150mA Voltage Regulator for RF/Analog Applications |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LP3999ITLX-3.3/NOPB | 功能描述:低壓差穩(wěn)壓器 - LDO 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(diào)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 |
| LP3-A0000001 | 制造商:OTTO Engineering Inc 功能描述:LP3-A13_3222 EX SUPR |
| LP3-A0000003 | 制造商:OTTO Engineering Inc 功能描述:LP3-A16_3222 EX SUPR |
| LP3-A0000006 | 制造商:OTTO Engineering Inc 功能描述:S/A LP4-A0000003 EX |
| LP3-A0000008 | 制造商:OTTO Engineering Inc 功能描述:LP3-A34R3225 WITH |
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