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參數(shù)資料
| 型號： | LTC1844-2.8 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 150mA, Micropower, Low Noise, VLDO Linear Regulator |
| 中文描述： | 150mA的，微功耗，低噪聲，VLDO線性穩(wěn)壓器 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 209K |
| 代理商： | LTC1844-2.8 |
8
LTC1844 Series
1844ia
APPLICATIO
S I
FOR
ATIO
U
temperature and applied voltage. The most common di-
electrics 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 4 and 5. 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.
W
U
U
Additionally, 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 microphone 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, espe-
cially when a ceramic capacitor is used for noise bypass-
ing. A ceramic capacitor produced Figure 6’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 DC Bias Characteristics
Figure 5. Ceramic Capacitor Temperature Characteristics
V
500
μ
V/DIV
100ms/DIV
1844 F06
Figure 6. Noise Resulting from Tapping on a Ceramic Capacitor
LTC1844-2.8
C
OUT
= 10
μ
F
C
BYP
= 0.01
μ
F
I
LOAD
= 100mA
DC BIAS VOLTAGE (V)
C
1844 F04
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
TEMPERATURE (
°
C)
–50
40
20
0
–20
–40
–60
–80
–100
25
75
1844 F05
–25
0
50
100
125
Y5V
C
X5R
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10
μ
F
Thermal Considerations
The power handling capability of the device will be limited
by the maximum rated junction temperature (125
°
C). The
power dissipated by the device will be the output current
multiplied by the input/output voltage differential:
(I
OUT
)(V
IN
– V
OUT
).
The LTC1844 series regulators have internal thermal lim-
iting designed to protect the device during momentary
overload conditions. For continuous normal conditions,
the maximum junction temperature rating of 125
°
C must
not be exceeded. It is important to give careful consider-
ation to all sources of thermal resistance from junction to
ambient. Additional heat sources mounted nearby must
also be considered.
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| LTC1844ES5-1.5#PBF | 制造商:Linear Technology 功能描述:LDO Regulator Pos 1.5V 0.15A 5-Pin TSOT-23 制造商:Linear Technology 功能描述:LDO 0.35VDO 0.15A 1.5V 5TSOT23 制造商:Linear Technology 功能描述:LDO, 0.35VDO, 0.15A, 1.5V, 5TSOT23 制造商:Linear Technology 功能描述:DP-LINREG, CUT TAPE 1.5V, Micropower, Low Noise VLDO 制造商:Linear Technology 功能描述:LDO, FIXED, 1.5V, 150mA, TSOT-23-5, Input Voltage Min:1.6V, Input Voltage Max:6.5V, Output Current:150mA, Dropout Voltage Vdo:350mV, No. of Pins:5, Operating Temperature Min:-40C, Operating Temperature Max:125C , RoHS Compliant: Yes |
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