参数资料
| 型号： | LT3082IDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/20页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ .2A 8DFN |
| 标准包装： | 2,500 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 可调 |
| 输入电压： | 1.2 V ~ 40 V |
| 电压 - 压降（标准）： | 1.3V @ 200mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 200mA（最小值） |
| 电流 - 限制（最小）： | 200mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFDFN 裸露焊盘 |
| 供应商设备封装： | 8-DFN-EP（3x3） |
| 包装： | 带卷 (TR) |
LT3082
APPLICATIONS INFORMATION
two equal inductors in parallel, but placing them in close
proximity gives the wires mutual inductance adding to
the self-inductance. The second and most effective way
Spreading the devices on the PC board also spreads the
heat. Series input resistors can further spread the heat if
the input-to-output difference is high.
to reduce overall inductance is to place both forward and
return current conductors (the input and GND wires) in
very close proximity. Two 30-AWG wires separated by
only 0.02", used as forward- and return-current conduc-
tors, reduce the overall self-inductance to approximately
one-?fth that of a single isolated wire.
IN
10μA
LT3082
+
–
If wiring modi?cations are not permissible for the applica-
SET
OUT
50mΩ
tions, including series resistance between the power supply
and the input of the LT3082 also stabilizes the application.
As little as 0.1Ω to 0.5Ω, often less, is effective in damping
the LC resonance. If the added impedance between the
power supply and the input is unacceptable, adding ESR to
V IN
4.8V TO
40V
1μF
IN
10μA
LT3082
+
–
the input capacitor also provides the necessary damping of
the LC resonance. However, the required ESR is generally
higher than the series impedance required.
SET
165k
OUT
50mΩ
V OUT , 3.3V
0.4A
10μF
3082 F05
Paralleling Devices
Higher output current is obtained by paralleling multiple
LT3082s together. Tie the individual SET pins together and
tie the individual IN pins together. Connect the outputs in
common using small pieces of PC trace as ballast resistors
to promote equal current sharing. PC trace resistance in
mΩ/inch is shown in Table 2. Ballasting requires only a
tiny area on the PCB.
Table 2. PC Board Trace Resistance
Figure 5. Parallel Devices
Quieting the Noise
The LT3082 offers numerous noise performance advan-
tages. Every linear regulator has its sources of noise. In
general, a linear regulator’s critical noise source is the
reference. In addition, consider the error ampli?er’s noise
contribution along with the resistor divider’s noise gain.
Many traditional low noise regulators bond out the voltage
WEIGHT (oz) 10mil WIDTH
1 54.3
2 27.1
Trace resistance is measured in mΩ/in
20mil WIDTH
27.1
13.6
reference to an external pin (usually through a large value
resistor) to allow for bypassing and noise reduction. The
LT3082 does not use a traditional voltage reference like
other linear regulators. Instead, it uses a 10μA reference
The worst-case room temperature offset, only ±2mV
between the SET pin and the OUT pin, allows the use of
very small ballast resistors.
As shown in Figure 5, each LT3082 has a small 50mΩ
ballast resistor, which at full output current gives better
than 80% equalized sharing of the current. The external
resistance of 50mΩ (25mΩ for the two devices in paral-
lel) adds only about 10mV of output regulation drop at an
output of 0.4A. Even with an output voltage as low as 1V,
this adds only 1% to the regulation. Of course, paralleling
more than two LT3082s yields even higher output current.
current. The 10μA current source generates noise current
levels of 2.7pA/√ Hz (0.7nA RMS over the 10Hz to 100kHz
bandwidth). The equivalent voltage noise equals the RMS
noise current multiplied by the resistor value.
The SET pin resistor generates spot noise equal to √ 4kTR
(k = Boltzmann’s constant, 1.38 ? 10 –23 J/°K, and T is abso-
lute temperature) which is RMS summed with the voltage
noise If the application requires lower noise performance,
bypass the voltage/current setting resistor with a capacitor
to GND. Note that this noise-reduction capacitor increases
start-up time as a factor of the RC time constant.
3082f
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3082IST | 制造商:LINER 制造商全称:Linear Technology 功能描述:200mA Single Resistor Low Dropout Linear Regulator |
| LT3082IST#PBF | 功能描述:IC REG LDO ADJ .2A SOT223-3 RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 产品培训模块:MIC5365/66 Ultra-small LDO Regulators 标准包装:1 系列:- 稳压器拓扑结构:正，固定式 输出电压:3V 输入电压:最高 5.5V 电压 - 压降（标准）:0.155V @ 150mA 稳压器数量:1 电流 - 输出:150mA 电流 - 限制（最小）:200mA 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:4-UDFN 裸露焊盘，4-TMLF? 供应商设备封装:4-TMLF?（1x1） 包装:Digi-Reel® 其它名称:576-3192-6 |
| LT3082IST#PBF | 制造商:Linear Technology 功能描述:LDO ADJ 200mA SOT-223-3 制造商:Linear Technology 功能描述:LDO, ADJ, 200mA, SOT-223-3 |
| LT3082IST#TRPBF | 功能描述:IC REG LDO ADJ .2A SOT223-3 RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 产品培训模块:More Information on LDOs 标准包装:50 系列:- 稳压器拓扑结构:正，固定式 输出电压:3.3V 输入电压:最高 15V 电压 - 压降（标准）:1.1V @ 800mA 稳压器数量:1 电流 - 输出:800mA 电流 - 限制（最小）:800mA 工作温度:0°C ~ 125°C 安装类型:表面贴装 封装/外壳:TO-263-4，D²Pak（3 引线+接片），TO-263AA 供应商设备封装:D2PAK-3 包装:管件 |
| LT3082ISTPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:200mA Single Resistor Low Dropout Linear Regulator |
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