参数资料
| 型号： | LT3071MPUFD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 22/28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
Calculating Junction Temperature
Example: Given an output voltage of 0.9V, an input voltage
range of 1.2V ± 5%, a BIAS voltage of 2.5V, a maximum
output current of 4A and a maximum ambient temperature
of 50°C, what will the maximum junction temperature be?
The power dissipated by the device equals:
I OUT(MAX) ? ( V IN(MAX) – V OUT ) + (I BIAS – I GND ) ? V OUT
+ I GND ? V BIAS
where:
I OUT(MAX) = 4A
V IN(MAX) = 1.26V
I BIAS at (I OUT = 4A, V BIAS = 2.5V) = 6.91mA
I GND at (I OUT = 4A, V BIAS = 2.5V) = 0.87mA
thus:
P = 4A ? (1.26 V – 0.9V) + (6.91mA – 0.87mA ) ? 0.9 V
+ 0.87mA ? 2.5 V = 1.448W
With the QFN package soldered to maximum copper
area, the thermal resistance is 30°C/W. So the junction
temperature rise above ambient equals:
1.448W at 30°C/W = 43.44°C
The maximum junction temperature equals the maximum
ambient temperature plus the maximum junction tempera-
ture rise above ambient or:
T JMAX = 50°C + 43.44°C = 93.44°C
Paralleling Devices for Higher I OUT
Multiple LT3071s may be paralleled to obtain higher output
current. This paralleling concept borrows from the scheme
employed by the LT3080.
To accomplish this paralleling, tie the REF/BYP pins of
the paralleled regulators together. This effectively gives
an averaged value of multiple 600mV reference voltage
sources. Tie the OUT pins of the paralleled regulators to
the common load plane through a small piece of PC trace
ballast or an actual surface mount sense resistor beyond
the primary output capacitors of each regulator. The re-
quired ballast is dependent upon the application output
voltage and peak load current. The recommended ballast
is that value which contributes 1% to load regulation. For
example, two LT3071 regulators configured to output 1V,
sharing a 10A load require 2mΩ of ballast at each output.
The Kelvin SENSE pins connect to the regulator side of
the ballast resistors to keep the individual control loops
from conflicting with each other (see Figures 8 and 9).
Keep this ballast trace area free of solder to maintain a
controlled resistance.
Table 4 shows a simple guideline for PCB trace resistance
as a function of weight and trace width.
Table 4. PC Board Trace Resistance
WEIGHT (oz) 100 MIL WIDTH* 200 MIL WIDTH*
1 5.43 2.71
2 2.71 1.36
*Trace resistance is measured in milliohms/in
Applications that cannot support extensive PCB space
for heat sinking the LT3071 require a derating of output
current or increased airflow.
3071fb
22
For more information www.linear.com/3071
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相关代理商/技术参数 |
参数描述 |
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| LT308.098 | 制造商:Moeller Electric Corporation 功能描述:BATTERY FOR A PS316 PLC CONTROLLER |
| LT3080 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Adjustable 3A Single Resistor Low Dropout Regulator |
| LT3080- | 制造商:LINER 制造商全称:Linear Technology 功能描述:45V VIN, Micropower, Low Noise, 100mA Low Dropout, Linear Regulator |
| LT3080/ | 制造商:LINER 制造商全称:Linear Technology 功能描述:45V VIN, Micropower, Low Noise, 100mA Low Dropout, Linear Regulator |
| LT3080-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.5A, Low Noise, Negative Linear Regulator |
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