参数资料
| 型号： | LT3050EDDB-5#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 19/26页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 5V .1A 12-DFN |
| 标准包装： | 1 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 5V |
| 输入电压： | 最高 45 V |
| 电压 - 压降（标准）： | 0.34V @ 100mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 100mA |
| 电流 - 限制（最小）： | 110mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-WFDFN 裸露焊盘 |
| 供应商设备封装： | 12-DFN-EP（3x2） |
| 包装： | 标准包装 |
| 其它名称： | LT3050EDDB-5#TRMPBFDKR |
LT3050 Series
APPLICATIONS INFORMATION
Start-up time is also affected by the presence of a feed-
forward capacitor. Start-up time is directly proportional to
the size of the feedforward capacitor and the output volt-
age, and is inversely proportional to the feedback resistor
divider current, slowing to 15ms with a 4.7nF feedforward
capacitor and a 10μF output capacitor for an output voltage
set to 5V by a 5μA feedback resistor divider.
Output Capacitance
The LT3050 regulator is stable with a wide range of output
capacitors. The ESR of the output capacitor affects stability,
most notably with small capacitors. Use a minimum output
capacitor of 2.2μF with an ESR of 3Ω or less to prevent
oscillations. If a feedforward capacitor is used with output
voltages set for greater than 24V, use a minimum output
capacitor of 4.7μF. The LT3050 is a micropower device
and output load transient response is a function of output
capacitance. Larger values of output capacitance decrease
the peak deviations and provide improved transient re-
sponse for larger load current changes. Bypass capacitors,
used to decouple individual components powered by the
LT3050, increase the effective output capacitor value. For
applications with large load current transients, a low ESR
ceramic capacitor in parallel with a bulk tantalum capacitor
often provides an optimally damped response.
Give extra consideration to the use of ceramic capacitors.
Manufacturers make ceramic capacitors with a variety of
dielectrics, each with different behavior across tempera-
ture and applied voltage. The most common dielectrics
are speci?ed with EIA temperature characteristic codes
of Z5U, Y5V, X5R and X7R. The Z5U and Y5V dielectrics
provide high C-V products in a small package at low cost,
but exhibit strong voltage and temperature coef?cients, 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 yield much more stable characteristics and are
more suitable for use as the output capacitor.
The X7R type works over a wider temperature range and
has better temperature stability, 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 Y5V and Z5U capacitors, but can
still be signi?cant enough to drop capacitor values below
appropriate levels. Capacitor DC bias characteristics tend
to improve as component case size increases, but expected
capacitance at operating voltage should be veri?ed.
20
BOTH CAPACITORS ARE 16V,
0
–20
–40
1210 CASE SIZE, 10μF
X5R
40
20
0
–20
X5R
–60
–80
Y5V
–40
–60
Y5V
–100
0
2
4
6
8
10
12
14
16
–80
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10μF
DC BIAS VOLTAGE (V)
–100
3050 F04
–50 –25
0
25
50
75
100
125
TEMPERATURE (°C)
Figure 4. Ceramic Capacitor DC Bias Characteristics
3050 F05
Figure 5. Ceramic Capacitor Temperature Characteristics
3050fa
19
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3050EDDB-5-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:100mA, Linear Regulator with Precision Current Limit and Diagnostic Outputs |
| LT3050EDDBPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:100mA, Low Noise Linear Regulator With Precision Current Limit And Diagnostic Functions |
| LT3050EDDB-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:100mA, Linear Regulator with Precision Current Limit and Diagnostic Outputs |
| LT3050EDDBTR | 制造商:LINER 制造商全称:Linear Technology 功能描述:100mA, Low Noise Linear Regulator With Precision Current Limit And Diagnostic Functions |
| LT3050EDDB-TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:100mA, Linear Regulator with Precision Current Limit and Diagnostic Outputs |
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