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參數(shù)資料
| 型號(hào)： | LP2980AIM5-4.7 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Hex Inverters 14-SOIC -40 to 85 |
| 中文描述： | 4.7 V FIXED POSITIVE LDO REGULATOR, 0.225 V DROPOUT, PDSO5 |
| 封裝： | SOT-23, 5 PIN |
| 文件頁(yè)數(shù)： | 12/18頁(yè) |
| 文件大?。?/td> | 423K |
| 代理商： | LP2980AIM5-4.7 |
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Application Hints
OUTPUT CAPACITOR
Like any low-dropout regulator, the LP2980 requires an out-
put capacitor to maintain regulator loop stability. This capaci-
tor must be selected to meet the requirements of minimum
capacitance and equivalent series resistance (ESR) range. It
is not difficult to find capacitors which meet the criteria of the
LP2980, as the acceptable capacitance and ESR ranges are
wider than for most other LDOs.
In general, the capacitor value must be at least 1 μF (over
the actual ambient operating temperature), and the ESR
must be within the range indicated in Figures 1, 2and Figure
3 It should be noted that, although a maximum ESR is
shown in these Figures, it is very unlikely to find a capacitor
with ESR that high.
Tantalum Capacitors
Surface-mountable solid tantalum capacitors offer a good
combination of small physical size for the capacitance value,
and ESR in the range needed by the LP2980.
The
results
of
testing
the
surface-mount solid tantalum capacitors show good stability
with values of at least 1 μF. The value can be increased to
2.2 μF (or more) for even better performance, including tran-
sient response and noise.
Small value tantalum capacitors that have been verified as
suitable for use with the LP2980 are shown in Table 2 Ca-
pacitance values can be increased without limit.
Aluminum Electrolytic Capacitors
Although probably not a good choice for a production design,
because of relatively large physical size, an aluminum elec-
trolytic capacitor can be used in the design prototype for an
LP2980 regulator. A value of at least 1 μF should be used,
and the ESR must meet the conditions of Figures 1, 2 and
Figure 3 If the operating temperature drops below 0C, the
regulator may not remain stable, as the ESR of the alumi-
num electrolytic capacitor will increase, and may exceed the
limits indicated in the Figures.
LP2980
stability
with
TABLE 2. Surface-Mount Tantalum Capacitor
Selection Guide
1 μF Surface-Mount Tantalums
Manufacturer
Kemet
NEC
Siemens
Nichicon
Sprague
2.2 μF Surface-Mount Tantalums
Manufacturer
Kemet
NEC
Siemens
Nichicon
Sprague
Multilayer Ceramic Capacitors
Surface-mountable multilayer ceramic capacitors may be an
attractive choice because of their relatively small physical
size and excellent RF characteristics. However, they some-
Part Number
T491A105M010AS
NRU105M10
B45196-E3105-K
F931C105MA
293D105X0016A2T
Part Number
T491A225M010AS
NRU225M06
B45196/2.2/10/10
F930J225MA
293D225X0010A2T
times have ESR values lower than the minimum required by
the LP2980, and relatively large capacitance change with
temperature. The manufacturer’s datasheet for the capacitor
should be consulted before selecting a value.
Test results of LP2980 stability using multilayer ceramic ca-
pacitors show that a minimum value of 2.2 μF is usually
needed for the 5V regulator. For the lower output voltages, or
for better performance, a higher value should be used, such
as 4.7 μF.
Multilayer ceramic capacitors that have been verified as suit-
able for use with the LP2980 are shown in Table 3
TABLE 3. Surface-Mount Multilayer Ceramic Capacitor
Selection Guide
2.2 μF Surface-Mount Ceramic
Manufacturer
Tokin
Murata
4.7 μF Surface-Mount Ceramic
Manufacturer
Tokin
Part Number
1E225ZY5U-C203
GRM42-6Y5V225Z16
Part Number
1E475ZY5U-C304
DS012078-48
FIGURE 1. 1 μF ESR Range
DS012078-49
FIGURE 2. 2.2 μF ESR Range
L
www.national.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LP2980AIM5-5.0 | 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 |
| LP2980AIM5-5.0 | 制造商:Texas Instruments 功能描述:V REG LDO +5.0V SMD 2980 SOT235 |
| LP2980AIM5-5.0/NOPB | 功能描述:低壓差穩(wěn)壓器 - LDO Micropower 50 mA Ultra LDO Regulator 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 |
| LP2980AIM5X-1.8 | 制造商:Rochester Electronics LLC 功能描述:50MA 1.8V SOT UPWR ULTRA LDO - Bulk 制造商:Texas Instruments 功能描述: |
| LP2980AIM5X-1.8/NOPB | 功能描述:IC REG LDO 1.8V 50MA SOT23-5 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:4V 輸入電壓:最高 16V 電壓 - 壓降（標(biāo)準(zhǔn)）:0.28V @ 150mA 穩(wěn)壓器數(shù)量:1 電流 - 輸出:150mA 電流 - 限制（最?。?- 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:5-VFBGA 供應(yīng)商設(shè)備封裝:5-uSMD 包裝:Digi-Reel® 其它名稱:LP2985AIBP-4.0DKR |
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