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參數(shù)資料
| 型號： | LP2980IM5-1.5 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Micropower SOT, 50 mA Low-Voltage Low-Dropout Regulator For Applications With Output Voltages < 2V |
| 中文描述： | 1.5 V FIXED POSITIVE LDO REGULATOR, PDSO5 |
| 封裝： | SOT-23, 5 PIN |
| 文件頁數(shù)： | 10/14頁 |
| 文件大?。?/td> | 805K |
| 代理商： | LP2980IM5-1.5 |
Application Hints
(Continued)
capacitor). If a Tantalum input capacitor is used, it must be
guaranteed by the manufacturer to have a surge current
rating sufficient for the application.
There are no requirements for ESR on the input capacitor,
but tolerance and temperature coefficient must be consid-
ered when selecting the capacitor to ensure the capacitance
will be
≥
1 μF over the entire operating range.
OUTPUT CAPACITOR
The LP2980 requires an output capacitor to maintain loop
stability. The capacitor must be selected to meet the require-
ments of capacitance and ESR (equivalent series resis-
tance) over the full operating temperature range of the ap-
plication (see
SELECTING THE OUTPUT CAPACITOR).
The minimum amount of capacitance which can be used on
the output is 2.2 μF, but this value may be increased without
limit.
Four curves are provided which show the stable ESR range
of the LP2980-1.8V operated with output capacitances of
2.2, 4.7, 10, and 15 μF:
10109118
2.2 μF ESR Curves For 1.8V Output
10109119
4.7 μF ESR Curves For 1.8V Output
10109120
10 μF ESR Curves For 1.8V Output
10109121
15 μF ESR Curves For 1.8V Output
It should be noted that for the lower values of the output
capacitance (
<
10 μF), it may be necessary to use a capaci-
tor and series resistance to provide sufficient ESR. To un-
derstand why this is true, the basic characteristics of capaci-
tance types must be explained:
CAPACITOR CHARACTERISTICS:
Ceramic Capacitors
have an extremely low ESR (in the
range of 5-15 m
), and can only be used on the output of the
LP2980 if an external resistor is placed in series to supply
the needed ESR (a resistance value of about 2
+/ 30% is
recommended).
Be careful of the temperature coefficient of ceramics: select
X7R or X5R if possible, because those types typically vary
less than +/ 25% over the range of 40 to +125C. Z5U
types are worse, and will typically lose half (or more) of their
capacitance over the same temperature range.
A source for large-value ceramics with good performance is
Taiyo-Yuden. Their web address is :
http://www.t-yuden.com/hicap.html
Tantalum capacitors
have ESR values that are more diffi-
cult to determine: the manufacturers specify only a maxi-
mum limit, which is typically 10X or 20X the typical value.
ESR values can vary considerably from lot to lot and from
manufacturer to manufacturer. For example, some 4.7 μF/
10V devices tested showed typical values in the range of 0.5
- 1
, but values as high as 6
have been seen.
It should also be noted that the ESR typically increases
about 2X - 3X when going from +125C down to 40C.
L
www.national.com
10
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LP2980IM5-2.5 | 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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LP2980IM5-2.5/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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LP2980IM5-2.7 | 制造商:Rochester Electronics LLC 功能描述:50MA MICROPWR SOT-23 ULTRA LDO - Bulk |
| LP2980IM5-2.7/NOPB | 制造商:Texas Instruments 功能描述: |
| LP2980IM5-2.8/NOPB | 功能描述:IC REG LDO 2.8V 50MA SOT23-5 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 穩(wěn)壓器拓撲結(jié)構(gòu):正，固定式 輸出電壓:3.1V 輸入電壓:最高 5.5V 電壓 - 壓降（標準）:- 穩(wěn)壓器數(shù)量:1 電流 - 輸出:300mA 電流 - 限制（最?。?420mA 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-5 細型，TSOT-23-5 供應(yīng)商設(shè)備封裝:TSOT-23-5 包裝:帶卷 (TR) |
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