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LT1763IS8-3.3-TRPBF 数据表(PDF) 16 Page - Linear Technology

部件名 LT1763IS8-3.3-TRPBF
功能描述  500mA, Low Noise, LDO Micropower Regulators
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LT1763IS8-3.3-TRPBF 数据表(HTML) 16 Page - Linear Technology

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LT1763 Series
16
1763fg
Output Capacitance and Transient Response
The LT1763 regulators are designed to be stable with a
wide range of output capacitors. The ESR of the output
capacitor affects stability, most notably with small capaci-
tors. A minimum output capacitor of 3.3μF with an ESR
of 3Ω, or less, is recommended to prevent oscillations.
The LT1763-X is a micropower device and output transient
response will be a function of output capacitance. Larger
values of output capacitance decrease the peak deviations
and provide improved transient response for larger load
current changes. Bypass capacitors, used to decouple
individual components powered by the LT1763-X, will
increase the effective output capacitor value. With larger
capacitors used to bypass the reference (for low noise
operation), larger values of output capacitors are needed.
For 100pF of bypass capacitance, 4.7μF of output capaci-
tor is recommended. With a 1000pF bypass capacitor or
larger, a 6.8μF output capacitor is recommended.
The shaded region of Figure 3 defines the range over
which the LT1763 regulators are stable. The minimum ESR
needed is defined by the amount of bypass capacitance
used, while the maximum ESR is 3Ω.
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 specified with EIA temperature
characteristic codes of Z5U, Y5V, X5R and X7R. The Z5U
and Y5V dielectrics are good for providing high capacitances
in a small package, but they tend to have strong voltage
and temperature coefficients, as shown in Figures 4
and 5. When used with a 5V regulator, a 16V 10μF Y5V
capacitor can exhibit an effective value as low as 1μF to
2μF for the DC bias voltage applied and 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. Care still must be exercised when
using X5R and X7R capacitors; the X5R and X7R codes
only specify operating temperature range and maximum
capacitance change over temperature. Capacitance change
due to DC bias with X5R and X7R capacitors is better than
APPLICATIONS INFORMATION
OUTPUT CAPACITANCE (μF)
1
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
310
1763 F03
24
5
6 78 9
STABLE REGION
CBYP = 330pF
CBYP 1000pF
CBYP = 100pF
CBYP = 0
Figure 3. Stability
DC BIAS VOLTAGE (V)
1763 F04
20
0
–20
–40
–60
–80
–100
0
4
8
10
26
12
14
X5R
Y5V
16
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10μF
TEMPERATURE (°C)
–50
40
20
0
–20
–40
–60
–80
–100
25
75
1763 F05
–25
0
50
100
125
Y5V
X5R
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10μF
Figure 4. Ceramic Capacitor DC Bias Characteristics
Figure 5. Ceramic Capacitor Temperature Characteristics


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