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參數(shù)資料
| 型號： | LD2985BM38R |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | VERY LOW DROP AND LOW NOISE VOLTAGE REGULATOR LOW ESR CAP. COMPATIBLE, WITH INHIBIT FUNCTION |
| 中文描述： | 很好低壓差，低噪聲穩(wěn)壓器低ESR的上限。一致，但禁止功能 |
| 文件頁數(shù)： | 9/13頁 |
| 文件大?。?/td> | 301K |
| 代理商： | LD2985BM38R |
LD2985 SERIES
9/13
Figure 13 :
Load Transient
Figure 14 :
Load Transient
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.
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.
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.
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.
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.
V
O
=2.5V, I
O
=0 to 50mA, no C
I
, C
O
=10
μ
F, t
s
=t
f
=2ns
V
O
=2.5V, I
O
=0 to 50mA, no C
I
, C
O
=4.7
μ
F, t
s
=t
f
=2ns
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LD2985BM40R | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:VERY LOW DROP AND LOW NOISE VOLTAGE REGULATOR LOW ESR CAP. COMPATIBLE, WITH INHIBIT FUNCTION |
| LD2985BM47R | 功能描述:低壓差穩(wěn)壓器 - LDO 4.7V 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 |
| LD2985BM50R | 功能描述:低壓差穩(wěn)壓器 - LDO 5.0V 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 |
| LD2985BXX | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Very low drop and low noise voltage regulator low ESR capacitors compatible, with inhibit function |
| LD2985BXX15 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:VERY LOW DROP AND LOW NOISE VOLTAGE REGULATO WITH INHIBIT FUNCTION |
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