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參數(shù)資料
| 型號(hào)： | LP38690SD-ADJ |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 1A Low Dropout CMOS Linear Regulators with Adjustable Output Stable with Ceramic Output Capacitors |
| 中文描述： | 1.25 V-9 V ADJUSTABLE POSITIVE LDO REGULATOR, PDSO6 |
| 封裝： | LLP-6 |
| 文件頁(yè)數(shù)： | 11/13頁(yè) |
| 文件大小： | 777K |
| 代理商： | LP38690SD-ADJ |
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Application Hints
(Continued)
load changes above that frequency. This means the effective
output impedance of the IC at frequencies above 100 kHz is
determined only by the output capacitor(s).
In applications where the load is switching at high speed, the
output of the IC may need RF isolation from the load. It is
recommended that some inductance be placed between the
output capacitor and the load, and good RF bypass capaci-
tors be placed directly across the load.
PCB layout is also critical in high noise environments, since
RFI/EMI is easily radiated directly into PC traces. Noisy
circuitry should be isolated from "clean" circuits where pos-
sible, and grounded through a separate path. At MHz fre-
quencies, ground planes begin to look inductive and RFI/
EMI can cause ground bounce across the ground plane. In
multi-layer PCB applications, care should be taken in layout
so that noisy power and ground planes do not radiate directly
into adjacent layers which carry analog power and ground.
OUTPUT NOISE
Noise is specified in two ways-
Spot Noise
or
Output Noise
density is the RMS sum of all noise sources, measured at
the regulator output, at a specific frequency (measured with
a 1Hz bandwidth). This type of noise is usually plotted on a
curve as a function of frequency.
Total Output Noise
or
Broad-Band Noise
is the RMS sum of spot noise over a
specified bandwidth, usually several decades of frequencies.
Attention should be paid to the units of measurement. Spot
noise is measured in units μV/root-Hz or nV/root-Hz and total
output noise is measured in μV(rms)
The primary source of noise in low-dropout regulators is the
internal reference. Noise can be reduced in two ways: by
increasing the transistor area or by increasing the current
drawn by the internal reference. Increasing the area will
decrease the chance of fitting the die into a smaller package.
Increasing the current drawn by the internal reference in-
creases the total supply current (ground pin current).
L
www.national.com
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相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LP38690 | 1A Low Dropout CMOS Linear Regulators |
| LP38691 | 500mA Low Dropout CMOS Linear Regulators Stable with Ceramic Output Capacitors |
| LP38691DT-1.8 | 500mA Low Dropout CMOS Linear Regulators Stable with Ceramic Output Capacitors |
| LP38691DT-2.5 | 500mA Low Dropout CMOS Linear Regulators Stable with Ceramic Output Capacitors |
| LP38691DT-3.3 | 500mA Low Dropout CMOS Linear Regulators Stable with Ceramic Output Capacitors |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LP38690SD-ADJ/NOPB | 功能描述:低壓差穩(wěn)壓器 - LDO 1A LDO CMOS LINEAR REG 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(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LP38690SDX-1.8 | 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(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LP38690SDX-1.8/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(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LP38690SDX-2.5 | 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(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LP38690SDX-2.5/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(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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