参数资料
| 型号： | LT3071MPUFD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 23/28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： | -55°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) |
| 其它名称： | LT3071MPUFD#TR LT3071MPUFD#TR-ND |
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LT3071
APPLICATIONS INFORMATION
Quieting the Noise
The LT3071 offers numerous noise performance advan-
tages. Each LDO has several sources of noise. An LDO’s
most critical noise source is the reference, followed by
the LDO error amplifier. Traditional low noise regulators
buffer the voltage reference out to an external pin (usually
through a large value resistor) to allow for bypassing and
noise reduction of reference noise. The LT3071 deviates
from the traditional voltage reference by generating a
low voltage V REF from a reference current into an inter-
nal resistor ? 19k. This intermediate impedance node
(REF/BYP) facilitates external filtering directly. A 10nF filter
capacitor minimizes reference noise to 10μV RMS at the
600mV REF/BYP pin, equivalently a 17μV contribution to
output noise at V OUT = 1V. See the Typical Performance
Characteristics for Noise vs Output Voltage performance
as a function of C REF/BYP .
This approach also accommodates reference sharing
between LT3071 regulators that are hooked up in cur-
rent sharing applications. The REF/BYP filter capacitor
delays the initial power-up time by a factor of the RC time
constant. V REF remains active in nap mode, thus start-up
time is significantly reduced and well controlled coming
out of nap mode (EN:LO ↑ HI).
V BIAS
2.2V TO 3.6V
2.2μF
50k
PWRGD
V IN
1.5V
330μF
IN
EN
V O0
V O1
V O2
BIAS
PWRGD
SENSE
LT3071 OUT
2.2μF*
4.7μF*
10μF*
V OUT
1.2V
5A
0.01μF
1nF
NC
MARGA
VIOC
I MON
REF/BYP
GND
*X5R OR X7R CAPACITORS
1k
V MON
2V AT 5A
FULL SCALE
3071 F06
Figure 6. 1.5V to 1.2V Linear Regulator
3071fb
For more information www.linear.com/3071
23
相关PDF资料 |
PDF描述 |
|---|---|
| LT3080IQ#TRPBF | IC REG LDO ADJ 1.1A DDPAK-5 |
| LT3082MPST#TRPBF | IC REG LDO ADJ .2A SOT-223 |
| LT3083MPQ#TRPBF | IC REG LDO ADJ 3A 5-DDPAK |
| LT3085MPMS8E#TRPBF | IC REG LDO ADJ .5A 8-MSOP |
| LT317AT | IC REG LDO ADJ 1.5A TO220-3 |
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