参数资料
| 型号： | LT3071EUFD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 19/28页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ 5A 28QFN |
| 标准包装： | 2,500 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 0.8 V ~ 1.8 V |
| 输入电压： | 0.95 V ~ 3 V |
| 电压 - 压降（标准）： | 0.085V @ 5A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 5A |
| 电流 - 限制（最小）： | 5.1A |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-QFN（4x5） |
| 包装： | 带卷 (TR) |
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LT3071
APPLICATIONS INFORMATION
20
0
–20
–40
–60
–80
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10μF
X5R
Y5V
40
20
0
–20
–40
–60
–80
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10μF
X5R
Y5V
–100
0
2
4 6 8 10 12
DC BIAS VOLTAGE (V)
14
16
–100
–50 –25
0 25 50 75
TEMPERATURE (°C)
100
125
3071 F04
Figure 4. Ceramic Capacitor DC Bias Characteristics
The X7R type has better stability across temperature,
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 significant enough to
drop capacitor values below appropriate levels. Capacitor
DC bias characteristics tend to improve as component
case size increases, but expected capacitance at operat-
ing voltage should be verified. Voltage and temperature
coefficients are not the only sources of problems. Some
ceramic capacitors have a piezoelectric response. A piezo-
electric device generates voltage across its terminals due
to mechanical stress, similar to the way a piezoelectric
microphone works. For a ceramic capacitor the stress
can be induced by vibrations in the system or thermal
transients.
Stability and Input Capacitance
The LT3071 is stable with a minimum capacitance of
47μF connected to its IN pins. Use low ESR capacitors to
minimize instantaneous voltage drops under large load
transient conditions. Large V IN droops during large load
transients may cause the regulator to enter dropout with
corresponding degradation in load transient response.
Increased values of input and output capacitance may be
necessary depending on an application’s requirements.
3071 F05
Figure 5. Ceramic Capacitor Temperature Characteristics
Sufficient input capacitance is critical as the circuit is in-
tentionally operated close to dropout to minimize power.
Ideally, the output impedance of the supply that powers
IN should be less than 10mΩ to support a 5A load with
large transients.
In cases where wire is used to connect a power supply
to the input of the LT3071 (and also from the ground of
the LT3071 back to the power supply ground), large input
capacitors are required to avoid an unstable application.
This is due to the inductance of the wire forming an LC
tank circuit with the input capacitor and not a result of the
LT3071 being unstable. The self inductance, or isolated
inductance, of a wire is directly proportional to its length.
However, the diameter of a wire does not have a major
influence on its self inductance. For example, one inch of
18-AWG, 0.04 inch diameter wire has 28nH of self induc-
tance. The self inductance of a 2-AWG isolated wire with
a diameter of 0.26 inch is about half the inductance of a
18-AWG wire. The overall self inductance of a wire can be
reduced in two ways. One is to divide the current flowing
towards the LT3071 between two parallel conductors
which flows in the same direction in each. In this case,
the farther the wires are placed apart from each other, the
more inductance will be reduced, up to a 50% reduction
when placed a few inches apart. Splitting the wires basi-
cally connects two equal inductors in parallel. However,
when placed in close proximity from each other, mutual
inductance is added to the overall self inductance of the
3071fb
For more information www.linear.com/3071
19
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3071IUFD | 制造商:LINER 制造商全称:Linear Technology 功能描述:5A, Low Noise, Programmable Output, 85mV Dropout Linear Regulator with Analog Margining |
| LT3071IUFD#PBF | 功能描述:IC REG LDO ADJ 5A 28QFN 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) |
| LT3071IUFD#TRPBF | 功能描述:IC REG LDO ADJ 5A 28QFN 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) |
| LT3071IUFD-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:5A, Low Noise, Programmable Output, 85mV Dropout Linear Regulator with Analog Margining |
| LT3071IUFD-TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:5A, Low Noise, Programmable Output, 85mV Dropout Linear Regulator with Analog Margining |
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