参数资料
| 型号： | LT3083IFE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/28页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ 3A 16-TSSOP |
| 标准包装： | 95 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 可调至 23V |
| 输入电压： | 1.2 V ~ 23 V |
| 电压 - 压降（标准）： | 1.25V @ 3A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 3A |
| 电流 - 限制（最小）： | 3A |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 供应商设备封装： | 16-TSSOP-EP |
| 包装： | 管件 |
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LT3083
APPLICATIONS INFORMATION
resistance of 10m? (5m? for the two devices in paral-
lel) only adds about 30mV of output regulation drop at
an output of 6A. With an output voltage of 3.3V, this only
adds 1% to the regulation. Of course, paralleling more
than two LT3083s yields even higher output current.
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.
Quieting the Noise
The LT3083 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 amplifier’s noise
contribution along with the resistor divider’s noise gain.
Many traditional low noise regulators bond out the voltage
reference to an external pin (usually through a large value
resistor) to allow for bypassing and noise reduction. The
LT3083 does not use a traditional voltage reference like
other linear regulators. Instead, it uses a 50μA reference
current. The 50μA current source generates noise current
levels of 3.16pA/√ Hz (1nA 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 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.
The LT3083’s noise advantage is that the unity gain follower
presents no noise gain whatsoever from the SET pin to the
output. Thus, noise figures do not increase accordingly.
Error amplifier noise is typically 126.5nV/√ Hz (40μV RMS )
over the 10Hz to 100kHz bandwidth). The error amplifier’s
noise is RMS summed with the other noise terms to give
a final noise figure for the regulator.
Curves in the Typical Performance Characteristics sec-
tion show noise spectral density and peak-to-peak noise
characteristics for both the reference current and error
amplifier over the 10Hz to 100kHz bandwidth.
Load Regulation
The LT3083 is a floating device. No ground pin exists on
the packages. Thus, the IC delivers all quiescent current
and drive current to the load. Therefore, it is not possible
to provide true remote load sensing. The connection resis-
tance between the regulator and the load determines load
regulation performance. The data sheet’s load regulation
specification is Kelvin sensed at the package’s pins. Nega-
tive-side sensing is a true Kelvin connection by returning
the bottom of the voltage setting resistor to the negative
side of the load (see Figure 6).
Connected as shown, system load regulation is the sum
of the LT3083’s load regulation and the parasitic line
resistance multiplied by the output current. To minimize
load regulation, keep the positive connection between the
regulator and load as short as possible. If possible, use
large diameter wire or wide PC board traces.
IN LT3083
The LT3083 uses a unity-gain follower from the SET pin
to the OUT pin. Therefore, multiple possibilities exist
(besides a SET pin resistor) to set output voltage. For
example, using a high accuracy voltage reference from
SET to GND removes the errors in output voltage due to
reference current tolerance and resistor tolerance. Active
driving of the SET pin is acceptable.
V CONTROL
+
–
SET R SET
OUT
PARASITIC
RESISTANCE
R P
R P
R P
LOAD
The typical noise scenario for a linear regulator is that the
output voltage setting resistor divider gains up the noise
reference, especially if V OUT is much greater than V REF .
3080 F06
Figure 6. Connections for Best Load Regulation
3083fa
14
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3083IQ | 制造商:LINER 制造商全称:Linear Technology 功能描述:Adjustable 3A Single Resistor Low Dropout Regulator |
| LT3083IQ#PBF | 功能描述:IC REG LDO ADJ 3A 5-DDPAK RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:3,000 系列:- 稳压器拓扑结构:正，固定式 输出电压:2.5V 输入电压:2.5 V ~ 5.5 V 电压 - 压降（标准）:- 稳压器数量:1 电流 - 输出:300mA（最小值） 电流 - 限制（最小）:360mA 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 供应商设备封装:TSOT-23-5 包装:带卷 (TR) |
| LT3083IQ#TRPBF | 功能描述:IC REG LDO ADJ 3A 5-DDPAK RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:3,000 系列:- 稳压器拓扑结构:正，固定式 输出电压:2.5V 输入电压:2.5 V ~ 5.5 V 电压 - 压降（标准）:- 稳压器数量:1 电流 - 输出:300mA（最小值） 电流 - 限制（最小）:360mA 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 供应商设备封装:TSOT-23-5 包装:带卷 (TR) |
| LT3083IT | 制造商:LINER 制造商全称:Linear Technology 功能描述:Adjustable 3A Single Resistor Low Dropout Regulator |
| LT3083IT#PBF | 功能描述:IC REG LDO ADJ 3A TO-220-5 RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:3,000 系列:- 稳压器拓扑结构:正，固定式 输出电压:2.5V 输入电压:2.5 V ~ 5.5 V 电压 - 压降（标准）:- 稳压器数量:1 电流 - 输出:300mA（最小值） 电流 - 限制（最小）:360mA 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 供应商设备封装:TSOT-23-5 包装:带卷 (TR) |
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