参数资料
| 型号： | LT3080EST#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/28页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ 1.1A SOT223-3 |
| 产品培训模块： | LT3080 Linear Voltage Regulator More Information on LDOs |
| 特色产品： | LT3080 |
| 标准包装： | 78 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 可调至 36V |
| 输入电压： | 1.2 V ~ 36 V |
| 电压 - 压降（标准）： | 1.35V @ 1.1A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 1.1A |
| 电流 - 限制（最小）： | 1.1A |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-261-4，TO-261AA |
| 供应商设备封装： | SOT-223 |
| 包装： | 管件 |
| 产品目录页面： | 1331 (CN2011-ZH PDF) |
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LT3080
APPLICATIONS INFORMATION
20
0
–20
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10μF
X5R
ceramic capacitor the stress can be induced by vibrations
in the system or thermal transients.
Paralleling Devices
–40
–60
–80
–100
0
2
4
Y5V
6 8 10 12
DC BIAS VOLTAGE (V)
14 16
3080 F02
LT3080’s may be paralleled to obtain higher output current.
The SET pins are tied together and the IN pins are tied
together. This is the same whether it’s in three terminal
mode or has separate input supplies. The outputs are
connected in common using a small piece of PC trace
as a ballast resistor to equalize the currents. PC trace
resistance in milliohms/inch is shown in Table 1. Only a
tiny area is needed for ballasting.
Figure 2. Ceramic Capacitor DC Bias Characteristics
Table 1. PC Board Trace Resistance
WEIGHT (oz)
10 mil WIDTH
20 mil WIDTH
40
20
1
2
54.3
27.1
27.1
13.6
0
X5R
Trace resistance is measured in mOhms/in
Y5V
–20
–40
–60
–80 BOTH CAPACITORS ARE 16V,
–100
1210 CASE SIZE, 10μF
–50 –25 0 25 50 75
100
125
The worse case offset between the set pin and the output
of only ± 2 millivolts allows very small ballast resistors
to be used. As shown in Figure 4, the two devices have
a small 10 milliohm ballast resistor, which at full output
current gives better than 80 percent equalized sharing
of the current. The external resistance of 10 milliohms
TEMPERATURE (°C)
3080 F03
Figure 3. Ceramic Capacitor Temperature Characteristics
V IN
V CONTROL
LT3080
–
–
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 significant enough
to drop capacitor values below appropriate levels. Capaci-
tor DC bias characteristics tend to improve as component
case size increases, but expected capacitance at operating
voltage should be verified.
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 microphone works. For a
V IN
4.8V TO 28V
1μF
+
OUT 10m
SET
V IN LT3080
V CONTROL
+
OUT 10m
SET
165k
3080 F04
Figure 4. Parallel Devices
V OUT
3.3V
2A
10μF
3080fc
11
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