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參數(shù)資料
| 型號： | LD2985 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Very low drop and low noise voltage regulator low ESR capacitors compatible, with inhibit function(與低ESR電容兼容，極低壓差，低噪聲穩(wěn)壓器) |
| 中文描述： | 非常低壓降和低噪聲穩(wěn)壓器兼容低ESR電容，以抑制功能（與低ESR的電容兼容，極低壓差，低噪聲穩(wěn)壓器） |
| 文件頁數(shù)： | 13/20頁 |
| 文件大?。?/td> | 290K |
| 代理商： | LD2985 |
LD2985 series
Application notes
13/20
5
Application notes
5.1
External capacitors
Like any low-dropout regulator, the LD2985 requires external capacitors for regulator
stability. This capacitor must be selected to meet the requirements of minimum capacitance
and equivalent series resistance. We suggest to solder input and output capacitors as close
as possible to the relative pins.
5.2
Input capacitor
An input capacitor whose value is 1μF is required with the LD2985 (amount of capacitance
can be increased without limit). This capacitor must be located a distance of not more than
0.5" from the input pin of the device and returned to a clean analog ground. Any good quality
ceramic, tantalum or film capacitors can be used for this capacitor.
5.3
Output capacitor
The LD2985 is designed specifically to work with ceramic output capacitors. It may also be
possible to use Tantalum capacitors, but these are not as attractive for reasons of size and
cost. By the way, the output capacitor must meet both the requirement for minimum amount
of capacitance and E.S.R. (equivalent series resistance) value. Due to the different loop
gain, the stability improves for higher output versions and so the suggested minimum output
capacitor value, if low E.S.R. ceramic type is used, is 1μF for output voltages equal or major
than 3.8V, 2.2μF for V
O
going from 1.8 to 3.3V, and 3.3μF for the other versions. However, if
an output capacitor lower than the suggested one is used, it's possible to make stable the
regulator adding a resistor in series to the capacitor.
5.4
Important
The output capacitor must maintain its ESR in the stable region over the full operating
temperature to assure stability. Also, capacitor tolerance and variation with temperature
must be considered to assure the minimum amount of capacitance is provided at all times.
This capacitor should be located not more than 0.5" from the output pin of the device and
returned to a clean analog ground.
5.5
Inhibit input operation
The inhibit pin can be used to turn OFF the regulator when pulled low, so drastically
reducing the current consumption down to less than 1μA. When the inhibit feature is not
used, this pin must be tied to V
I
to keep the regulator output ON at all times. To assure
proper operation, the signal source used to drive the inhibit pin must be able to swing above
and below the specified thresholds listed in the electrical characteristics section under V
IH
V
IL
. Any slew rate can be used to drive the inhibit.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LD2985_10 | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:VERY LOW DROP AND LOW NOISE VOLTAGE REGULATOR LOW ESR CAP |
| LD2985_11 | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:VERY LOW DROP AND LOW NOISE VOLTAGE REGULATOR LOW ESR CAP. |
| LD2985AM15R | 功能描述:低壓差穩(wěn)壓器 - LDO 1.5V 0.15A Very Low 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(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 |
| LD2985AM18R | 功能描述:低壓差穩(wěn)壓器 - LDO 1.8V 150mA Positive 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(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 |
| LD2985AM25R | 功能描述:低壓差穩(wěn)壓器 - LDO 2.5V 150mA Positive 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(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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