参数资料
| 型号： | LT1763IS8-3#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/22页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 3V .5A 8-SOIC |
| 产品培训模块： | More Information on LDOs |
| 标准包装： | 100 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 3V |
| 输入电压： | 最高 20V |
| 电压 - 压降（标准）： | 0.3V @ 500mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 500mA |
| 电流 - 限制（最小）： | 520mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
LT1763 Series
APPLICATIONS INFORMATION
Output Capacitance and Transient Response
4.0
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.
3.5
3.0
2.5
2.0
1.5
C BYP = 0
STABLE REGION
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
1.0
0.5
C BYP = 100pF
C BYP = 330pF
C BYP 1000pF
and provide improved transient response for larger load
0
1
2
3
4 5 6 7 8 9 10
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
OUTPUT CAPACITANCE (μF)
Figure 3. Stability
1763 F03
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 de?nes the range over
which the LT1763 regulators are stable. The minimum ESR
needed is de?ned by the amount of bypass capacitance
used, while the maximum ESR is 3Ω.
Extra consideration must be given to the use of ceramic
20
0
–20
–40
–60
–80
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10μF
X5R
Y5V
capacitors. Ceramic capacitors are manufactured with a
–100
0
2
4
6
8
10
12
14
16
variety of dielectrics, each with different behavior across
DC BIAS VOLTAGE (V)
1763 F04
temperature and applied voltage. The most common
dielectrics used are speci?ed 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 coef?cients, as shown in Figures 4
Figure 4. Ceramic Capacitor DC Bias Characteristics
40
20
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
0
–20
–40
–60
–80
Y5V
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10μF
X5R
available in higher values. Care still must be exercised when
using X5R and X7R capacitors; the X5R and X7R codes
–100
–50 –25
0 25 50 75
TEMPERATURE (°C)
100
125
1763 F05
only specify operating temperature range and maximum
capacitance change over temperature. Capacitance change
Figure 5. Ceramic Capacitor Temperature Characteristics
due to DC bias with X5R and X7R capacitors is better than
1763fg
16
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1763IS8-3TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:500mA, Low Noise, LDO Micropower Regulators |
| LT1763IS8-3-TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:500mA, Low Noise, LDO Micropower Regulators |
| LT1763IS8-3TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:500mA, Low Noise, LDO Micropower Regulators |
| LT1763IS8-3-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:500mA, Low Noise, LDO Micropower Regulators |
| LT1763IS8-5 | 制造商:LINER 制造商全称:Linear Technology 功能描述:500mA, Low Noise, LDO Micropower Regulators |
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