参数资料
| 型号： | LT3070IUFD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 20/28页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ 5A 28QFN |
| 产品培训模块： | LT3070 - 5A, Low Noise, Programmable Output, 85mV Dropout Linear Regulator |
| 标准包装： | 73 |
| 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： | 管件 |
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LT3070
APPLICATIONS INFORMATION
20
0
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10μF
the LT3070 back to the power supply ground), large input
capacitors are required to avoid an unstable application.
20
0
–40
X5R
–20
–40
–60
Y5V
–80
–100
0 2 4 6 8 10 12 14 16
DC BIAS VOLTAGE (V)
3070 F04
Figure 4. Ceramic Capacitor DC Bias Characteristics
40
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10μF
X5R
–20
Y5V
–60
–80
–100
–50 –25 0 25 50 75 100 125
TEMPERATURE (°C)
3070 F05
Figure 5. Ceramic Capacitor Temperature Characteristics
Stability and Input Capacitance
The LT3070 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.
Sufficient input capacitance is critical as the circuit is
intentionally 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 LT3070 (and also from the ground of
This is due to the inductance of the wire forming an LC
tank circuit with the input capacitor and not a result of the
LT3070 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 flow-
ing towards the LT3070 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
wires. The most effective way to reduce overall inductance
is to place the forward and return-current conductors (the
wire for the input and the wire for the return ground) in
very close proximity. Two 18-AWG wires separated by
0.05 inch reduce the overall self inductance to about one-
fourth of a single isolated wire. If the LT3070 is powered
by a battery mounted in close proximity with ground and
power planes on the same circuit board, a 47μF input
capacitor is sufficient for stability. However, if the LT3070
is powered by a distant supply, use a low ESR, large value
input capacitor on the order of 330μF. As power supply
output impedance varies, the minimum input capacitance
needed for application stability also varies.
Bias Pin Capacitance Requirements
The BIAS pin supplies current to most of the internal
control circuitry and the output stage driving the pass
transistor. The LT3070 requires a minimum 2.2μF by-
pass capacitor for stability and proper operation. To
ensure proper operation, the BIAS voltage must sat-
isfy the following conditions: 2.2V ≤ V BIAS ≤ 3.6V and
V BIAS ≥ (1.25 ? V OUT + 1V). For V OUT ≤ 0.95V, the
minimum BIAS voltage is limited to 2.2V.
3070fb
20
For more information www.linear.com/LT3070
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3070IUFDTR | 制造商:LINER 制造商全称:Linear Technology 功能描述:5A, Low Noise, Programmable Output, 85mV Dropout Linear Regulator |
| LT3070IUFDTRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:5A, Low Noise, Programmable Output, 85mV Dropout Linear Regulator |
| LT3070MPUFD | 制造商:LINER 制造商全称:Linear Technology 功能描述:5A, Low Noise, Programmable Output, 85mV Dropout Linear Regulator |
| LT3070MPUFD#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) |
| LT3070MPUFD#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) |
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