参数资料
| 型号： | LT3085MPMS8E#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/28页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ .5A 8-MSOP |
| 产品培训模块： | More Information on LDOs |
| 标准包装： | 2,500 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 可调 |
| 输入电压： | 1.2 V ~ 36 V |
| 电压 - 压降（标准）： | 1.35V @ 500mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 500mA |
| 电流 - 限制（最小）： | 500mA |
| 工作温度： | -55°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 供应商设备封装： | 8-MSOP-EP |
| 包装： | 带卷 (TR) |
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LT3085
APPLICATIONS INFORMATION
The worst-case offset between the SET pin and the output
of only ±1.5mV allows very small ballast resistors to be
used. As shown in Figure 4, the two devices have a small
10mΩ and 20mΩ ballast resistors, which at full output
current gives better than 80% equalized sharing of the
current. The external resistance of 20mΩ (6.6mΩ for the
two devices in parallel) only adds about 10mV of output
regulation drop at an output of 1.5A. Even with an output
voltage as low as 1V, this only adds 1% to the regulation.
Of course, more than two LT308X’s can be paralleled for
even higher output current. They are spread out on the
PC board, spreading the heat. Input resistors can further
spread the heat if the input-to-output difference is high.
Thermal Performance
In this example, two LT3085 2mm × 3mm DFN devices
are mounted on a 1oz copper 4-layer PC board. They are
placed approximately 1.5 inches apart and the board is
mounted vertically for convection cooling. Two tests were
set up to measure the cooling performance and current
sharing of these devices.
The first test was done with approximately 1.6V
input- to-output and 0.5A per device. This gave a 800mW
dissipation in each device and a 1A output current. The
temperature rise above ambient is approximately 28°C
and both devices were within plus or minus 1°C. Both the
thermal and electrical sharing of these devices is excel-
lent. The thermograph in Figure 5 shows the temperature
distribution between these devices and the PC board
reaches ambient temperature within about a half an inch
from the devices.
The power is then increased with 3.4V across each device.
This gives 1.7 watts dissipation in each device and a device
temperature of about 90°C, about 65°C above ambient
as shown in Figure 6. Again, the temperature matching
V IN
LT3080
V CONTROL
+
SET
–
OUT 10mΩ
Figure 5. Temperature Rise at 800mW Dissipation
V IN
V IN
LT3085
4.8V TO 28V
V CONTROL
1μF
SET
+
–
OUT 20mΩ
V OUT
3.3V
1.5A
10μF
165k
3085 F04
Figure 4. Parallel Devices
Figure 6. Temperature Rise at 1.7W Dissipation
3085fb
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3090EDD#PBF | 制造商:Linear Technology 功能描述:IC REG LDO NEG ADJ 0.6A 10DFN 制造商:Linear Technology 功能描述:IC, LINEAR VOLT REG, -36V, DFN-10 制造商:Linear Technology 功能描述:LDO, ADJ, 0V-32V, 600MA, DFN-10, Primary Input Voltage:-36V, Dropout Voltage Vdo 制造商:Linear Technology 功能描述:LDO, ADJ, 0V-32V, 600MA, DFN-10, Input Voltage Min:-36V, Input Voltage Max:-1.5V, Output Voltage Min:-32V, Output Voltage Max:0V, Output Current:600mA, Dropout Voltage Vdo:300mV, No. of Pins:10, Operating Temperature Min:-40C , RoHS Compliant: Yes |
| LT3090EMSE#PBF | 制造商:Linear Technology 功能描述:IC REG LDO NEG ADJ 0.6A 12MSOP 制造商:Linear Technology 功能描述:IC, LINEAR VOLT REG, -36V, MSOP-12 制造商:Linear Technology 功能描述:LDO, ADJ, 0V-32V, 600MA, MSOP-12, Primary Input Voltage:-36V, Dropout Voltage Vd |
| LT3090EMSE#TRPBF | 制造商:Linear Technology 功能描述:IC REG LDO NEG ADJ 0.6A 12MSOP 制造商:Linear Technology 功能描述:LDO, ADJ, 0V-32V, 600MA, MSOP-12, Primary Input Voltage:-36V, Dropout Voltage Vd |
| LT3090HDD#PBF | 制造商:Linear Technology 功能描述:IC REG LDO NEG ADJ 0.6A 10DFN 制造商:Linear Technology 功能描述:IC, LINEAR VOLT REG, -36V, DFN-10 制造商:Linear Technology 功能描述:LDO, ADJ, 0V-32V, 600MA, DFN-10, Input Voltage Min:-36V, Input Voltage Max:-1.5V, Output Voltage Min:-32V, Output Voltage Max:0V, Output Current:600mA, Dropout Voltage Vdo:300mV, No. of Pins:10, Operating Temperature Min:-40C , RoHS Compliant: Yes |
| LT3090HMSE#PBF | 制造商:Linear Technology 功能描述:IC REG LDO NEG ADJ 0.6A 12MSOP 制造商:Linear Technology 功能描述:IC, LINEAR VOLT REG, -36V, MSOP-12 |
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