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參數資料
| 型號： | LP3997 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Micropower 250mA CMOS LDO Regulator with Error Flag / Power-On-Reset |
| 中文描述： | 微功耗250mA的CMOS LDO穩(wěn)壓器，錯誤旗/上電復位 |
| 文件頁數： | 10/11頁 |
| 文件大?。?/td> | 279K |
| 代理商： | LP3997 |
Applications Information
(Continued)
The ceramic capacitor’s capacitance can vary with tempera-
ture. The capacitor type X7R, which operates over a tem-
perature range of -55C to +125C, will only vary the capaci-
tance to within
±
15%. The capacitor type X5R has a similar
tolerance over a reduced temperature range of -55C to
+85C. Most large value ceramic capacitors, larger than 1μF
are manufactured with Z5U or Y5V temperature characteris-
tics. Their capacitance can drop by more than 50% as the
temperature goes from 25C to 85C. Therefore X7R is
recommended over Z5U and Y5V in applications where the
ambient temperature will change significantly above or be-
low 25C.
Tantalum capacitors are less desirable than ceramic for use
as output capacitors because they are more expensive when
comparing equivalent capacitance and voltage ratings in the
1μF to 4.7μF range.
Another important consideration is that tantalum capacitors
have higher ESR values than equivalent size ceramics. This
means that while it may be possible to find a tantalum
capacitor with an ESR value within the stable range, it would
have to be larger in capacitance (which means bigger and
more costly ) than a ceramic capacitor with the same ESR
value. It should also be noted that the ESR of a typical
tantalum will increase about 2:1 as the temperature goes
from 25C down to -40C, so some guard band must be
allowed.
20092940
FIGURE 1. Graph Showing a Typical Variation in
Capacitance vs DC Bias
L
www.national.com
10
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LP3997MM-3.3 | 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 負載調節(jié):0.3 % 輸出端數量: 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 |
| LP3997MM-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 負載調節(jié):0.3 % 輸出端數量: 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 |
| LP3997MM-3.3/NOPB | 制造商:Texas Instruments 功能描述:Linear Voltage Regulator IC |
| LP3997MMX-3.3/NOPB | 功能描述:IC REG LDO 3.3V .25A 8-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 穩(wěn)壓器拓撲結構: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 供應商設備封裝:TSOT-23-5 包裝:帶卷 (TR) |
| LP3999ITL-1.5 | 制造商:Texas Instruments 功能描述:LDO Regulator Pos 1.5V 0.15A 5-Pin uSMD T/R |
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