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參數(shù)資料
| 型號： | LT1761-1.8 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 100mA, Low Noise, LDO Micropower Regulators in SOT-23(1.8V輸出，100mA,低噪聲，低壓差穩(wěn)壓器（SOT-23封裝）) |
| 中文描述： | 100mA的，低噪聲，LDO穩(wěn)壓器采用SOT微功耗穩(wěn)壓- 23（1.8V的輸出，100mA的，低噪聲，低壓差穩(wěn)壓器（采用SOT - 23封裝）） |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 197K |
| 代理商： | LT1761-1.8 |
13
LT1761 Series
APPLICATIO
S I
N
FOR
ATIO
U
W
U
Extra consideration must be given to the use of ceramic
capacitors. Ceramic capacitors are manufactured with a
variety of dielectrics, each with different behavior across
temperature and applied voltage. The most common
dielectrics used are Z5U, Y5V, X5R and X7R. The Z5U and
Y5V dielectrics are good for providing high capacitances
in a small package, but exhibit strong voltage and tem-
perature coefficients as shown in Figures 3 and 4. When
used with a 5V regulator, a 10
μ
F Y5V capacitor can exhibit
an effective value as low as 1
μ
F to 2
μ
F over the operating
temperature range. The X5R and X7R dielectrics result in
more stable characteristics and are more suitable for use
as the output capacitor. The X7R type has better stability
across temperature, while the X5R is less expensive and
is available in higher values.
Voltage and temperature coefficients are not the only
sources of problems. Some ceramic capacitors have a
piezoelectric response. A piezoelectric device generates
voltage across its terminals due to mechanical stress,
similar to the way a piezoelectric accelerometer or micro-
phone works. For a ceramic capacitor the stress can be
induced by vibrations in the system or thermal transients.
The resulting voltages produced can cause appreciable
amounts of noise, especially when a ceramic capacitor is
used for noise bypassing. A ceramic capacitor produced
Figure 5’s trace in response to light tapping from a pencil.
Similar vibration induced behavior can masquerade as
increased output voltage noise.
Figure 4. Ceramic Capacitor Temperature Characteristics
Figure 3. Ceramic Capacitor DC Bias Characteristics
TEMPERATURE (
°
C)
–50
40
20
0
–20
–40
–60
–80
–100
25
75
1761 G04
–25
0
50
100
125
Y5V
C
X5R
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10
μ
F
100ms/DIV
1761 F05
V
500
μ
V/DIV
DC BIAS VOLTAGE (V)
C
1761 F02
20
0
–20
–40
–60
–80
–1000
4
8
10
2
6
12
14
X5R
Y5V
16
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10
μ
F
Figure 5. Noise Resulting from Tapping on a Ceramic Capacitor
LT1761-5
C
OUT
= 10
μ
F
C
BYP
= 0.01
μ
F
I
LOAD
= 100mA
Figure 2. Stability
OUTPUT CAPACITANCE (
μ
F)
1
E
)
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
3
10
1761 F02
2
4
5
6 7 8 9
STABLE REGION
C
BYP
= 330pF
C
BYP
= 100pF
C
BYP
= 0
C
BYP
> 3300pF
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT1761-2 | 100mA, Low Noise, LDO Micropower Regulators in SOT-23(2V輸出，100mA,低噪聲，低壓差穩(wěn)壓器（SOT-23封裝）) |
| LT1761-2.5 | 100mA, Low Noise, LDO Micropower Regulators in SOT-23(2.5V輸出，100mA,低噪聲，低壓差穩(wěn)壓器（SOT-23封裝）) |
| LT1761-3 | 100mA, Low Noise, LDO Micropower Regulators in SOT-23(3V輸出，100mA,低噪聲，低壓差穩(wěn)壓器（SOT-23封裝）) |
| LT1761-3.3 | 100mA, Low Noise, LDO Micropower Regulators in SOT-23(3.3V輸出，100mA,低噪聲，低壓差穩(wěn)壓器（SOT-23封裝）) |
| LT1761-5 | 100mA, Low Noise, LDO Micropower Regulators in SOT-23(5V輸出，100mA,低噪聲，低壓差穩(wěn)壓器（SOT-23封裝）) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1761CS5-2.5 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Positive Fixed Voltage Regulator |
| LT1761CS5-3 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Positive Fixed Voltage Regulator |
| LT1761CS5-3.3 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Positive Fixed Voltage Regulator |
| LT1761CS5-5 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Positive Fixed Voltage Regulator |
| LT1761CS5-BYP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Positive Adjustable Voltage Regulator |
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